FALLACIOUS
fallacious
(adjective) based on an incorrect or misleading notion or information; “fallacious hope”
deceitful, fallacious, fraudulent
(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”
fallacious, unsound
(adjective) containing or based on a fallacy; “fallacious reasoning”; “an unsound argument”
Source: WordNet® 3.1
Etymology
Adjective
fallacious (comparative more fallacious, superlative most fallacious)
Characterized by fallacy; false or mistaken.
Deceptive or misleading.
Usage notes
• Nouns often used with "fallacious": argument, reasoning, etc.
Source: Wiktionary
Fal*la"cious, a. Etym: [L. fallaciosus, fr. fallacia: cf. F.
fallacieux. See Fallacy.]
Definition: 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.
Source: Webster’s Unabridged Dictionary 1913 Edition