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a/the liar is not believed when he tells the truth

proverb A person who gains a reputation for being dishonest will not be believed about anything, even the truth. You've become so adept at taking advantage of your friends' goodwill, that you're going to run into trouble should you even genuinely need help. The liar is not believed when he tells the truth. You need to stop spinning these tall tales, Frankie, or people will start believing you to be nothing but a liar—and a liar is not believed even when he tells the truth.
See also: believe, he, liar, not, tell, truth

bald-faced liar

One who tells blatantly obvious or impudent untruths easily and with little or no attempt to disguise the lie. Everyone knows he is just a bald-faced liar. It's a wonder anyone believes a thing he says anymore.
See also: liar

barefaced liar

One who tells blatantly obvious or impudent untruths easily and with little or no attempt to disguise the lie. Everyone knows he is just a barefaced liar. It's a wonder anyone believes a thing he says anymore.
See also: barefaced, liar

barefaced lie

A blatantly obvious or impudent untruth, one in which the liar does not attempt to disguise their mendacity. My opponent's assertion that I intend to raise the tax rates is baseless; it is nothing but a barefaced lie.
See also: barefaced, lie

bold-faced liar

One who tells blatantly obvious and/or impudent untruths easily and with little or no attempt to disguise the lie. Everyone knows he is just a bold-faced liar. It's a wonder anyone believes a thing he says anymore.
See also: liar

Liar, liar, pants on fire!

A childhood taunt said to someone who is believed to be lying. A: "Liar, liar, pants on fire!" A: "No, my mom is really a magical princess, I swear!" A: "I swear I didn't take that money!" B: "Liar, liar, pants on fire—I saw you take it from Mom's purse this morning!"
See also: on, pant

liars need good memories

proverb If you're going to lie successfully, you need to be able to remember and keep track of your lies. You always get yourself into trouble because you don't remember the lies you've already told people. Liars need good memories, man.
See also: good, liar, memory, need

out and out

1. adjective Absolute; total. Typically hyphenated and used before a noun. I don't think the guy is an out-and-out liar, I just don't completely trust him. The entire project was an out-and-out disaster from beginning to end.
2. adverb Wholly or completely. We're still hoping that the show won't be canceled out and out, but it remains to be seen. He accused the politician of out and out lying to the public.
See also: and, out

the devil is a liar

Used as a harsh repudiation of some statement, stance, or opinion as being a lie or deception. I was told I would never make it in this industry, but the devil is a liar! A: "Tom here says you were the one who took the money." B: "The devil is a liar! I never touched that money, and he knows it!
See also: devil, liar
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

liar is not believed (even) when he tells the truth

Prov. If people think that you are a liar, they will not believe anything you say. As it turned out, Fred was right when he warned his friends that the police were planning to raid their party; but they paid no attention to him, since they knew him to be a liar, and a liar is not believed even when he tells the truth.
See also: believe, he, liar, not, tell, truth
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.

barefaced lie

A shameless falsehood. For example, Bill could tell a barefaced lie with a straight face. The adjective barefaced means "beardless," and one theory is that in the 1500s this condition was considered brazen in all but the youngest males. By the late 1600s barefaced also meant "brazen" or "bold," the meaning alluded to in this phrase.
See also: barefaced, lie
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

barefaced lie/liar

A shamelessly bold untruth/prevaricator. Bare here means bold-faced or brazen, but one writer speculates that barefaced, which dates from the late sixteenth century, originally meant “beardless,” a condition perhaps considered audacious in all but the youngest men. In any event, by the late seventeenth century it also meant bold and became attached to lie in succeeding years. See also naked truth.
See also: barefaced, liar, lie

liar, liar, pants on fire

A schoolyard taunt to someone suspected of prevaricating. It also is used by adults, although not usually in a serious sense. However, former New York mayor Edward I. Koch, berating politicians who failed to sign on to remake the state’s ineffective government, said, “You’re either on the side of the angels, or you’re a bum. And if the angels betray their pledges, I’m going to run around the state screaming, ‘Liar, liar, pants on fire!’” (New York Times, August 8, 2010). And a cartoon by Mike Luckovich shows one character with flames on his pants, saying “The evidence is overwhelming, global warming’s real . . .” while the other replies, “Liar, liar, pants on fire” (Boston Globe, July 23, 2010).
See also: fire, on, pant

out and out

Thoroughly, wholly. This term preserves the old meaning of the adverb out as “to the conclusion” or “to an end” (from ca. 1300). Chaucer used it in Troilus and Criseyde (ca. 1374): “For out and out he is the worthiest, save only Ector.”
See also: and, out
The Dictionary of Clichés by Christine Ammer Copyright © 2013 by Christine Ammer
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References in periodicals archive ?
"The suspensions are tough, but I fully accept them," said Coach Liar, sounding very much like a guy who knows he got away with the crime.
The most popular myth about deception is that liars can't look you in the eye.
The three predominant stereotypes of deceptive behaviors were, in descending order: that liars avoid eye contact (58.0%); that liars tend to touch/scratch themselves more (54.5%); and that liars increase the frequency of hand gestures (53.0%).
And not only other Republicans, Baptists, bigots, and liars. I bet this crap somehow makes sense to a lot of regular, basically good people--people who have long been conditioned to accept the demonization of the evil, overprivileged gays, none of whom they think they know.
But presidential deceptions tend to have unintended consequences that fall on not only the liar hut also his successors.
Our patient did not experience a radical decrease in tons(liar size alter one treatment, and a repeat treatment did not decrease tons(liar size any further.
In the only worldwide study of its kind, scientists asked more than 2,000 people from nearly 60 countries, "How can you tell when people are lying?" From Botswana to Belgium, the number-one answer was the same: Liars avert their gaze.
'Mind-controller' Derren Brown is on hand with tips on how to tell a liar -it's all in the eyes, apparently -and Plimmer also surveys some famous liars, including Bill Clinton and Harold Shipman.
Moreover, whether in criminal or civil trials, courts have applied Rule 4-3.4 of the Rules Regulating The Florida Bar prohibiting an attorney from stating a personal opinion as to the credibility of a witness during closing argument.(2) Yet, the appellate courts wavered in their opinions as to whether characterizing a witness as a "liar" constituted an ethically improper personal opinion or whether it was a permissible comment on the credibility of a witness, when supported by record evidence.
These signals, some of which can pass in a split second, indicate the leakage of emotions that the liar would rather keep hidden: guilt, anger, fear, embarrassment, or "duping delight," the glee some liars feel at deceiving their targets.
In his play Othello, he created arguably the greatest liar in the history of literature.
This is a defense and extension of Stephen Yablo's claim that self-reference is completely inessential to the liar paradox.
Two movie producers are suing Hollywood moguls for at least pounds 15 million over the blockbuster comedy Liar, Liar.
Liar Liar and Shattered Trust: The Shari Karney Story turn from the detective to the juridical mode to shore up their respective proofs.