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fallacious (adj.)

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

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Definitions of fallacious from WordNet

fallacious (adj.)
containing or based on a fallacy;
fallacious reasoning
Synonyms: unsound
fallacious (adj.)
intended to deceive; "smooth, shining, and deceitful as thin ice" - S.T.Coleridge;
fallacious testimony
Synonyms: deceitful / fraudulent
fallacious (adj.)
based on an incorrect or misleading notion or information;
fallacious hope
From wordnet.princeton.edu