untruth

1 a false idea or belief <their argument rests on a fundamental untruth which has long been discredited> Synonyms delusion, error, falsehood, falsity, hallucination, illusion, misbelief, misconception, myth, old wives' tale, fallacyRelated Words factoid; superstition; fiction, pretense (or pretence); distortion, inaccuracy, misapprehension, miscomprehension, misinterpretation, misjudgment, misperception, misunderstanding; misinformation, misknowledge, misreport, misrepresentation, misstatement; sophism, sophistry; fib, half-truth, lie, story, taleAntonyms truth, verity

2 a statement known by its maker to be untrue and made in order to deceive <the Web site is rife with untruths and misleading information> Synonyms fable, fabrication, fairy tale, falsehood, falsity, fib, mendacity, prevarication, story, tale, taradiddle (or tarradiddle), lie, whopperRelated Words distortion, exaggeration, half-truth; ambiguity, equivocation, obliquity; defamation, libel, slander; perjury; bluff, fiction, pose, pretense (or pretence); humbug, jive, nonsense; canard, fallacy, misconception, myth; falsification, misinformation, misreport, misrepresentation, misstatement; deceit, deceitfulness, dishonesty, duplicity, fraudulenceNear Antonyms fact, truism, verity; honesty, truthfulness, veracity; authentication, confirmation, substantiation, validation, verificationAntonyms truth

3 the quality or state of being false <there is an element of untruth in all forms of art: works of art provide only a semblance of reality> Synonyms erroneousness, fallaciousness, falsehood, falseness, falsity, fallacyRelated Words speciousness, spuriousness; deception, deceptiveness, delusion; inaccuracy, incorrectness; dishonesty, mendaciousness, mendacity, untruthfulnessNear Antonyms accuracy, actuality, correctness, factuality, factualness, genuineness; credibility, honesty, trustworthiness, truthfulness, veracityAntonyms truth, verity