A lie is an assertion that is believed to be false, typically used with the purpose of deceiving someone. The practice of communicating lies is called lying. A person who communicates a lie may be termed a liar. Lies may serve a variety of instrumental, interpersonal, or psychological functions for the individuals who use them. Generally, the term "lie" carries a negative connotation, and depending on the context a person who communicates a lie may be subject to social, legal, religious, or criminal sanctions.
There appears to be no comprehensive and scholarly taxonomy of lies even though, or perhaps because, lies are a linguistic universal. As a corollary it has also been posited that another linguistic universal is that there is no sentence or story that cannot be interpreted as a lie. The proof is to preface the sentence or story with the phrase "it is a lie that" and follow that with a made up, but verifiable, explanation of why that sentence or story is a lie. This can be convincingly done in any natural language.
A barefaced (or bald-faced) lie is one that is obviously a lie to those hearing it. "Bold-faced lie" can also refer to misleading or inaccurate newspaper headlines, but this usage appears to be a more recent appropriation of the term.
A big lie is one that attempts to trick the victim into believing something major, which will likely be contradicted by some information the victim already possesses, or by their common sense. When the lie is of sufficient magnitude it may succeed, due to the victim's reluctance to believe that an untruth on such a grand scale would indeed be concocted.
A black lie is what is known as a lie. It is an anti-social behavior where the liar benefits from deceiving and the listener or some other group is hurt. These are most often referred to as high-stakes lies in research. When these serious lies are strategic and impact trust in relationships they may be devastating and end ties; these have been referred to as gravitas lies. (See "blue lie" and "white lie" below).
A blue lie is assessed by some as between a white lie and a black lie; as such, it is simultaneously an example of pro-social and anti-social behavior. A blue lie is intended to help one's group, thus pro-social; but it does so by damaging others through deceit, thus anti-social. The color blue is said to be a reference to its purported use by police. (See "black lie" above and "white lie" below).
To bluff is to pretend to have a capability or intention one does not possess. Bluffing is an act of deception that is rarely seen as immoral when it takes place in the context of a game, such as poker, where this kind of deception is consented to in advance by the players. For instance, a gamblers who deceive other players into thinking they have different cards to those they really hold, or athletes who hint they will move left and then dodges right is not considered to be lying (also known as a feint or juke). In these situations, deception is acceptable and is commonly expected as a tactic.
Bullshit (also B.S., bullcrap, bull) does not necessarily have to be a complete fabrication. While a lie is related by a speaker who believes what is said is false, bullshit is offered by a speaker who does not care whether what is said is true because the speaker is more concerned with giving the hearer some impression. Thus bullshit may be either true or false, but demonstrates a lack of concern for the truth that is likely to lead to falsehoods.
A cover-up may be used to deny, defend, or obfuscate a lie, errors, embarrassing actions, or lifestyle, and/or lie(s) made previously. One may deny a lie made on a previous occasion, or alternatively, one may claim that a previous lie was not as egregious as it was. For example, to claim that a premeditated lie was really "only" an emergency lie, or to claim that a self-serving lie was really "only" a white lie or noble lie. This should not be confused with confirmation bias in which the deceiver is deceiving themselves.
To deflect is to avoid the subject that the lie is about, not giving attention to the lie. When attention is given to the subject the lie is based around, deflectors ignore or refuse to respond. Skillful deflectors are passive-aggressive, who when confronted with the subject choose to ignore and not respond.
An exaggeration occurs when the most fundamental aspects of a statement are true, but only to a certain degree. It also is seen as "stretching the truth" or making something appear more powerful, meaningful, or real than it is. Saying that someone devoured most of something when they only ate half would be considered an exaggeration. An exaggeration might be easily found to be a hyperbole where a person's statement (i.e. in informal speech, such as "He did this one million times already!") is meant not to be understood literally.
Fake news is supposed to be a type of yellow journalism that consists of deliberate misinformation or hoaxes spread via traditional print and broadcast news media or online social media. Sometimes the term is applied as a deceptive device to deflect attention from uncomfortable truths and facts, however.
A fib is a lie that is easy to forgive due to its subject being a trivial matter; for example, a child may tell a fib by claiming that the family dog broke a household vase, when the child was the one who broke it.
Fraud refers to the act of inducing another person or people to believe a lie in order to secure material or financial gain for the liar. Depending on the context, fraud may subject the liar to civil or criminal penalties.
A half-truth is a deceptive statement that includes some element of truth. The statement might be partly true, the statement may be totally true, but only part of the whole truth, or it may employ some deceptive element, such as improper punctuation or double meaning, especially if the intent is to deceive, evade, blame, or misrepresent the truth.
An honest lie (or confabulation) may be identified by verbal statements or actions that inaccurately describe the history, background, and present situations. There is generally no intent to misinform and the individual is unaware that their information is false. Because of this, it is not technically a lie at all since, by definition, there must be an intent to deceive for the statement to be considered a lie.
Jocose lies are lies meant in jest, intended to be understood as such by all present parties. Teasing and irony are examples. A more elaborate instance is seen in some storytelling traditions, where the storyteller's insistence that the story is the absolute truth, despite all evidence to the contrary (i.e., tall tale), is considered humorous. There is debate about whether these are "real" lies, and different philosophers hold different views. The Crick Crack Club in London arranges a yearly "Grand Lying Contest" with the winner being awarded the coveted "Hodja Cup" (named for the Mulla Nasreddin: "The truth is something I have never spoken."). The winner in 2010 was Hugh Lupton. In the United States, the Burlington Liars' Club awards an annual title to the "World Champion Liar."
Lie-to-children is a phrase that describes a simplified explanation of technical or complex subjects as a teaching method for children and laypeople. While lies-to-children are useful in teaching complex subjects to people who are new to the concepts discussed, they can promote the creation of misconceptions among the people who listen to them. The phrase has been incorporated by academics within the fields of biology, evolution, bioinformatics, and the social sciences. Media use of the term has extended to publications including The Conversation and Forbes.
Lying by omission, also known as a continuing misrepresentation or quote mining, occurs when an important fact is left out in order to foster a misconception. Lying by omission includes the failure to correct pre-existing misconceptions. For example, when the seller of a car declares it has been serviced regularly, but does not mention that a fault was reported during the last service, the seller lies by omission. It may be compared to dissimulation. An omission is when a person tells most of the truth, but leaves out a few key facts that therefore, completely obscures the truth.
Lying in trade occurs when the seller of a product or service may advertise untrue facts about the product or service in order to gain sales, especially by competitive advantage. Many countries and states have enacted consumer protection laws intended to combat such fraud.
A memory hole is a mechanism for the alteration or disappearance of inconvenient or embarrassing documents, photographs, transcripts, or other records, such as from a website or other archive, particularly as part of an attempt to give the impression that something never happened.
A noble lie, which also could be called a strategic untruth, is one that normally would cause discord if uncovered, but offers some benefit to the liar and assists in an orderly society, therefore, potentially being beneficial to others. It is often told to maintain law, order, and safety.
In psychiatry, pathological lying (also called compulsive lying, pseudologia fantastica, and mythomania) is a behavior of habitual or compulsive lying. It was first described in the medical literature in 1891 by Anton Delbrueck. Although it is a controversial topic, pathological lying has been defined as "falsification entirely disproportionate to any discernible end in view, may be extensive and very complicated, and may manifest over a period of years or even a lifetime". The individual may be aware they are lying, or may believe they are telling the truth, being unaware that they are relating fantasies.
Perjury is the act of lying or making verifiably false statements on a material matter under oath or affirmation in a court of law, or in any of various sworn statements in writing. Perjury is a crime, because the witness has sworn to tell the truth and, for the credibility of the court to remain intact, witness testimony must be relied on as truthful.
A polite lie is a lie that a politeness standard requires, and that usually is known to be untrue by both parties. Whether such lies are acceptable is heavily dependent on culture. A common polite lie in international etiquette may be to decline invitations because of "scheduling difficulties". Similarly, the butler lie is a small lie that usually is sent electronically and is used to terminate conversations or to save face.
Puffery is an exaggerated claim typically found in advertising and publicity announcements, such as "the highest quality at the lowest price", or "always votes in the best interest of all the people". Such statements are unlikely to be true – but cannot be proven false and so, do not violate trade laws, especially as the consumer is expected to be able to determine that it is not the absolute truth.
The phrase "speaking with a forked tongue" means to deliberately say one thing and mean another or, to be hypocritical, or act in a duplicitous manner. This phrase was adopted by Americans around the time of the Revolution, and may be found in abundant references from the early nineteenth century – often reporting on American officers who sought to convince the Indigenous peoples of the Americas with whom they negotiated that they "spoke with a straight and not with a forked tongue" (as for example, President Andrew Jackson told members of the Creek Nation in 1829). According to one 1859 account, the proverb that the "white man spoke with a forked tongue" originated in the 1690s, in the descriptions by the indigenous peoples of French colonials in America inviting members of the Iroquois Confederacy to attend a peace conference, but when the Iroquois arrived, the French had set an ambush and proceeded to slaughter and capture the Iroquois.
A weasel word is an informal term for words and phrases aimed at creating an impression that a specific or meaningful statement has been made, when in fact only a vague or ambiguous claim has been communicated, enabling the specific meaning to be denied if the statement is challenged. A more formal term is equivocation.
A white lie is a minor lie which could be considered harmless, or even beneficial, in the long term. A white lie also is considered a lie to be used for greater good (pro-social behavior). It sometimes is used to shield someone from a hurtful or emotionally-damaging truth, especially when not knowing the truth is deemed by the liar as completely harmless. (See "black lie" and "blue lie" above).
Once a lie has been told, there can be two alternative consequences: it may be discovered or remain undiscovered. Under some circumstances, discovery of a lie may discredit other statements by the same speaker and may lead to social or legal sanctions against the speaker, such as ostracizing or conviction for perjury. When a lie is discovered, the state of mind and behavior of the liar is no longer predictable.
Hannah Arendt spoke about extraordinary cases in which an entire society is being lied to consistently. She said that the consequences of such lying are "not that you believe the lies, but rather that nobody believes anything any longer. This is because lies, by their very nature, have to be changed, and a lying government has constantly to rewrite its own history. On the receiving end you get not only one lie—a lie which you could go on for the rest of your days—but you get a great number of lies, depending on how the political wind blows."
Polygraph "lie detector" machines measure the physiological stress a subject endures in a number of measures while giving statements or answering questions. Spikes in stress indicators are purported to reveal lying. The accuracy of this method is widely disputed. In several well-known cases, application of the technique was proven to have been deceived. Nonetheless, it remains in use in many areas, primarily as a method for eliciting confessions or employment screening. The unreliability of polygraph results are the basis of such evaluations not being admissible as court evidence and, generally, the technique is perceived to be pseudoscience.
A recent study found that composing a lie takes longer than telling the truth and thus, the time taken to answer a question may be used as a method of lie detection, however, it also has been shown that instant answers with a lie may be proof of a prepared lie. A recommendation provided to resolve that contradiction is to try to surprise the subject and find a midway answer, not too quick, nor too long.
Aristotle believed no general rule on lying was possible, because anyone who advocated lying could never be believed, he said. Although the philosophers, St. Augustine, St. Thomas Aquinas, and Immanuel Kant, condemned all lying, Thomas Aquinas did advance an argument for lying, however. According to all three, there are no circumstances in which, ethically, one may lie. Even if the only way to protect oneself is to lie, it is never ethically permissible to lie even in the face of murder, torture, or any other hardship. Each of these philosophers gave several arguments for the ethical basis against lying, all compatible with each other. Among the more important arguments are:
Meanwhile, utilitarian philosophers have supported lies that achieve good outcomes – white lies. In his 2008 book, How to Make Good Decisions and Be Right All the Time, Iain King suggested a credible rule on lying was possible, and he defined it as: "Deceive only if you can change behaviour in a way worth more than the trust you would lose, were the deception discovered (whether the deception actually is exposed or not)."
In Lying, neuroscientist Sam Harris argues that lying is negative for the liar and the person who's being lied to. To say lies is to deny others access to reality, and often we cannot anticipate how harmful lies can be. The ones we lie to may fail to solve problems they could have solved only on a basis of good information. To lie also harms oneself, makes the liar distrust the person who's being lied to. Liars generally feel badly about their lies and sense a loss of sincerity, authenticity, and integrity. Harris asserts that honesty allows one to have deeper relationships and to bring all dysfunction in one's life to the surface.
In Human, All Too Human, philosopher Friedrich Nietzsche suggested that those who refrain from lying may do so only because of the difficulty involved in maintaining lies. This is consistent with his general philosophy that divides (or ranks) people according to strength and ability; thus, some people tell the truth only out of weakness.
Possession of the capacity to lie among non-humans has been asserted during language studies with great apes. In one instance, the gorilla Koko, when asked who tore a sink from the wall, pointed to one of her handlers and then laughed.
Deceptive body language, such as feints that mislead as to the intended direction of attack or flight, is observed in many species. A mother bird deceives when she pretends to have a broken wing to divert the attention of a perceived predator – including unwitting humans – from the eggs in her nest, instead to her, as she draws the predator away from the location of the nest, most notably a trait of the killdeer.
The cliché "All is fair in love and war", asserts justification for lies used to gain advantage in these situations. Sun Tzu declared that "All warfare is based on deception." Machiavelli advised in The Prince that a prince must hide his behaviors and become a "great liar and deceiver", and Thomas Hobbes wrote in Leviathan: "In war, force and fraud are the two cardinal virtues."
It is asserted that the capacity to lie is a talent human beings possess universally.
The evolutionary theory proposed by Darwin states that only the fittest will survive and by lying, we aim to improve other's perception of our social image and status, capability, and desirability in general. Studies have shown that humans begin lying at a mere age of six months, through crying and laughing, to gain attention. Scientific studies have also shown the presence of gender differences in lying.
Although men and women lie at equal frequencies, men are more likely to lie in order to please themselves while women are more likely to lie to please others. The presumption is that humans are individuals living in a world of competition and strict social norms, where they are able to use lies and deception to enhance chances of survival and reproduction.
Stereotypically speaking, Smith asserts that men like to exaggerate about their sexual expertise, but shy away from topics that degrade them while women understate their sexual expertise to make themselves more respectable and loyal in the eyes of men and avoid being labelled as a ‘scarlet woman’.
Those with Parkinson's disease show difficulties in deceiving others, difficulties that link to prefrontal hypometabolism. This suggests a link between the capacity for dishonesty and integrity of prefrontal functioning.
Pseudologia fantastica is a term applied by psychiatrists to the behavior of habitual or compulsive lying. Mythomania is the condition where there is an excessive or abnormal propensity for lying and exaggerating.
Some people believe that they are convincing liars, however in many cases, they are not.
The Old Testament and New Testament of the Bible both contain statements that God cannot lie and that lying is immoral (Num. 23:19, Hab. 2:3, Heb. 6:13–18). Nevertheless, there are examples of God deliberately causing enemies to become disorientated and confused, in order to provide victory (2 Thess. 2:11; 1 Kings 22:23; Ezek. 14:9).
Various passages of the Bible feature exchanges that assert lying is immoral and wrong (Prov. 6:16–19; Ps. 5:6), (Lev. 19:11; Prov. 14:5; Prov. 30:6; Zeph. 3:13), (Isa. 28:15; Dan. 11:27), most famously, in the Ten Commandments: "Thou shalt not bear false witness" (Ex. 20:2–17; Deut. 5:6–21); Ex. 23:1; Matt. 19:18; Mark 10:19; Luke 18:20 a specific reference to perjury.
Other passages feature descriptive (not prescriptive) exchanges where lying was committed in extreme circumstances involving life and death, however, most Christian philosophers would argue that lying is never acceptable, but that even those who are righteous in God's eyes sin sometimes. Old Testament accounts of lying include:
In the New Testament, Jesus refers to the Devil as the father of lies (John 8:44) and Paul commands Christians "Do not lie to one another" (Col. 3:9; cf. Lev. 19:11). In the Day of Judgement, unrepentant liars will be punished in the lake of fire. (Rev. 21:8; 21:27).
Augustine of Hippo wrote two books about lying: On Lying (De Mendacio) and Against Lying (Contra Mendacio). He describes each book in his later work, Retractions. Based on the location of De Mendacio in Retractions, it appears to have been written about 395 AD. The first work, On Lying, begins: "Magna quæstio est de Mendacio" ("There is a great question about Lying"). From his text, it can be derived that St. Augustine divided lies into eight categories, listed in order of descending severity:
Despite distinguishing between lies according to their external severity, Augustine maintains in both treatises that all lies, defined precisely as the external communication of what one does not hold to be internally true, are categorically sinful and therefore, ethically impermissible.
Augustine wrote that lies told in jest, or by someone who believes or opines the lie to be true are not, in fact, lies.
The fourth of the five Buddhist precepts involves falsehood spoken or committed to by action. Avoiding other forms of wrong speech are also considered part of this precept, consisting of malicious speech, harsh speech, and gossip. A breach of the precept is considered more serious if the falsehood is motivated by an ulterior motive  (rather than, for example, "a small white lie"). The accompanying virtue is being honest and dependable, and involves honesty in work, truthfulness to others, loyalty to superiors, and gratitude to benefactors. In Buddhist texts, this precept is considered most important next to the first precept, because a lying person is regarded to have no shame, and therefore capable of many wrongs. Lying is not only to be avoided because it harms others, but also because it goes against the Buddhist ideal of finding the truth.
The fourth precept includes avoidance of lying and harmful speech. Some modern Buddhist teachers such as Thich Nhat Hanh interpret this to include avoiding spreading false news and uncertain information. Work that involves data manipulation, false advertising, or online scams can also be regarded as violations. Anthropologist Barend Terwiel reports that among Thai Buddhists, the fourth precept also is seen to be broken when people insinuate, exaggerate, or speak abusively or deceitfully.
Zoroaster teaches that there are two powers in the universe; Asha, which is truth, order, and that which is real, and Druj, which is "the Lie". Later on, the Lie became personified as Angra Mainyu, a figure similar to the Christian Devil, who was portrayed as the eternal opponent of Ahura Mazda (God).
Herodotus, in his mid-fifth-century BC account of Persian residents of the Pontus, reports that Persian youths, from their fifth year to their twentieth year, were instructed in three things – "to ride a horse, to draw a bow, and to speak the Truth". He further notes that: "The most disgraceful thing in the world [the Persians] think, is to tell a lie; the next worst, to owe a debt: because, among other reasons, the debtor is obliged to tell lies."
In Achaemenid Persia, the lie, drauga (in Avestan: druj), is considered to be a cardinal sin and it was punishable by death in some extreme cases. Tablets discovered by archaeologists in the 1930s  at the site of Persepolis give us adequate evidence about the love and veneration for the culture of truth during the Achaemenian period. These tablets contain the names of ordinary Persians, mainly traders and warehouse-keepers. According to Stanley Insler of Yale University, as many as 72 names of officials and petty clerks found on these tablets contain the word truth. Thus, says Insler, we have Artapana, protector of truth, Artakama, lover of truth, Artamanah, truth-minded, Artafarnah, possessing splendour of truth, Artazusta, delighting in truth, Artastuna, pillar of truth, Artafrida, prospering the truth, and Artahunara, having nobility of truth.
It was Darius the Great who laid down the "ordinance of good regulations" during his reign. Darius' testimony about his constant battle against the Lie is found in the Behistun Inscription. He testifies: "I was not a lie-follower, I was not a doer of wrong ... According to righteousness I conducted myself. Neither to the weak or to the powerful did I do wrong. The man who cooperated with my house, him I rewarded well; who so did injury, him I punished well."
Darius had his hands full dealing with large-scale rebellion which broke out throughout the empire. After fighting successfully with nine traitors in a year, Darius records his battles against them for posterity and tells us how it was the Lie that made them rebel against the empire. At the Behistun inscription, Darius says:
Then advice to his son Xerxes, who is to succeed him as the great king:
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