From The Collaborative International Dictionary of English v.0.44 [gcide]:
Fallacious \Fal*la"cious\, adjective [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}, adverb -{Fal*la"cious*ness}, n.
From WordNet (r) 2.0 [wn]:
fallacious
adjective
1: containing or based on a fallacy; "fallacious reasoning"; "an unsound argument" [syn: {unsound}]
2: 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}, {fraudulent}]
3: based on an incorrect or misleading notion or information; "fallacious hope"
From Moby Thesaurus II by Grady Ward, 1.0 [moby-thes]:
171 Moby Thesaurus words for "fallacious": Albigensian, Arian, Barmecidal, Barmecide, Catharist, Donatist, Ebionitist, Erastian, Gnostic, Jansenist, Jansenistic, Jovinianist, Jovinianistic, Lollard, Manichaean, Monophysite, Monophysitic, Montanist, Montanistic, Pelagian, Sabellian, Waldensian, Wyclifite, aberrant, abroad, absonant, adrift, airy, all abroad, all off, all wrong, amiss, antinomian, apocryphal, apparent, apparently sound, apparitional, askew, astray, at fault, autistic, awry, beguiling, beside the mark, casuistic, catchy, chimeric, colorable, contradictory, contrary to fact, contrary to reason, corrupt, deceiving, deceptive, defective, deluding, delusional, delusionary, delusive, delusory, dereistic, deviant, deviational, deviative, disingenuous, distorted, dreamlike, dreamy, dubious, emanationist, empty, errant, erring, erroneous, false, fantastic, faultful, faulty, fishy, flawed, hallucinatory, heretical, heterodox, hollow, hylotheist, hylotheistic, illogical, illusional, illusionary, illusive, illusory, imaginary, in error, inauthentic, inconclusive, incongruous, inconsequent, inconsequential, inconsistent, insincere, invalid, irrational, jesuitic, loose, mad, misleading, nonorthodox, nonrational, nonscientific, not following, not right, not true, off, off the track, ostensible, out, overrefined, oversubtle, pantheist, pantheistic, paralogical, peccant, perverse, perverted, phantasmagoric, phantasmal, phantom, philosophistic, plausible, questionable, reasonless, seeming, self-annulling, self-contradictory, self-deceptive, self-deluding, self-refuting, senseless, sophistic, sophistical, specious, spectral, straying, supposititious, trickish, tricksy, tricky, truthless, unaccepted, unactual, unapproved, unauthentic, unauthoritative, uncanonical, unconnected, unfactual, unfounded, unorthodox, unphilosophical, unproved, unreal, unreasonable, unscientific, unscriptural, unsound, unsubstantial, untrue, visionary, wide, without reason, wrong
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