definitions

fallacious

[ fuh-ley-shuh s ]
/ fəˈleɪ ʃəs /
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SEE MORE SYNONYMS FOR fallacious ON THESAURUS.COM

adjective

containing a fallacy; logically unsound: fallacious arguments.
deceptive; misleading: fallacious testimony.
disappointing; delusive: a fallacious peace.

RELATED WORDS

deceptive, delusive, erroneous, fictitious, fishy, fraudulent, illogical, illusory, incorrect, invalid, irrational, mad, misleading, mistaken, off, phony, spurious, unfounded, unreal, unreasonable

Nearby words

fall, albert bacon, fall, the, fall-off, falla, falla, manuel de, fallacious, fallaciously, fallacy, fallacy of composition, fallacy of division, fallacy of many questions

Origin of fallacious

First recorded in 1500–10, fallacious is from the Latin word fallāciōsus deceitful, deceptive. See fallacy, -ous
Related forms
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for fallacious

British Dictionary definitions for fallacious

fallacious

/ (fəˈleɪʃəs) /

adjective

containing or involving a fallacy; illogical; erroneous
tending to mislead
delusive or disappointinga fallacious hope
Derived Formsfallaciously, adverbfallaciousness, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for fallacious

fallacious

adj.

c.1500, from fallacy (Latin fallacia) + -ous. Related: Fallaciously; fallaciousness.

Online Etymology Dictionary, © 2010 Douglas Harper