'Fallacious' definitions:

Definition of 'fallacious'

From: WordNet
adjective
Containing or based on a fallacy; "fallacious reasoning"; "an unsound argument" [syn: fallacious, unsound]
adjective
Intended to deceive; "deceitful advertising"; "fallacious testimony"; "smooth, shining, and deceitful as thin ice" - S.T.Coleridge; "a fraudulent scheme to escape paying taxes" [syn: deceitful, fallacious, fraudulent]
adjective
Based on an incorrect or misleading notion or information; "fallacious hope"

Definition of 'Fallacious'

From: GCIDE
  • Fallacious \Fal*la"cious\, a. [L. fallaciosus, fr. fallacia: cf. F. fallacieux. See Fallacy.] Embodying or pertaining to a fallacy; illogical; fitted to deceive; misleading; delusive; as, fallacious arguments or reasoning. -- {Fal*la"cious*ly}, adv. -{Fal*la"cious*ness}, n. [1913 Webster]

Synonyms of 'fallacious'

From: Moby Thesaurus