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Definitions for Fallacy

[1] a deceptive, misleading, or false notion, belief, etc.: That the world is flat was at one time a popular fallacy.
[2] a misleading or unsound argument.
[3] deceptive, misleading, or false nature; erroneousness.
[4] Logic . any of various types of erroneous reasoning that render arguments logically unsound.
[5] Obsolete . deception.
[6] an incorrect or misleading notion or opinion based on inaccurate facts or invalid reasoning
[7] unsound or invalid reasoning
[8] the tendency to mislead
[9] logic an error in reasoning that renders an argument logically invalid

Words related to Fallacy

falsehood, deception, misinterpretation, untruth, heresy, paradox, inconsistency, cavil, perversion, delusion, miscalculation, bias, casuistry, artifice, evasion, quirk, ambiguity, speciousness, sophistry, deviation

Words nearby Fallacy

fall webworm, fall wind, fall, the, falla, fallacious, fallacy, fallacy of composition, fallacy of division, fallacy of many questions, fallal, fallback

Origin of Fallacy

1350–1400; < Latin fallācia a trick, deceit, equivalent to fallāc- (stem of fallāx ) deceitful, fallacious + -ia -y3; replacing Middle English fallace < Middle French

Word origin for Fallacy

C15: from Latin fallācia , from fallax deceitful, from fallere to deceive

Synonyms for Fallacy

deception, falsehood, heresy, inconsistency, misinterpretation, paradox, untruth, aberration, ambiguity, artifice, bias, casuistry, cavil, deceit, deceptiveness, delusion, deviation, elusion, equivocation, erratum, erroneousness, error, evasion, faultiness, flaw, illogicality, inexactness, invalidity, misapprehension, miscalculation, misconstrual, mistake, notion, perversion, preconception, prejudice, quirk, solecism, sophism, sophistry, speciousness, subterfuge, non sequitur, quibbling