- I(New American Roget's College Thesaurus)adj. plausible, ostensible, apparent, casuistic, insincere; deceptive. See falsehood, imagination.Ant., logical, sincere.II(Roget's IV) modif.Syn. plausible, credible, colorable, beguiling, deceptive, misleading, ostensible, meretricious, sophistical, casuistic, probable, presumable, presumptive, likely, apparent, apparently right, seemingly just, hypocritical, fallacious, unsound.Ant. valid, unlikely, incredible.Syn.- specious applies to that which is superficially reasonable, valid, etc. but is actually not so, and it connotes intention to deceive [ a specious excuse ] ; plausible applies to that which at first glance appears to be true, reasonable, valid, etc. but which may or may not be so, although there is no connotation of deliberate deception [ a plausible argument ] ; credible is used of that which is believable because it is supported by evidence, sound logic, etc. [ a credible account ]III(Roget's 3 Superthesaurus) (VOCABULARY WORD) a.[SPEE shus]plausible but invalid, having only the appearance of the truth.Lawyers are adept at putting forth specious arguments.SYN.: plausible, sophistic, seeming, conceivable, possible, misleading, credible, unsound, ostensible, deceptive, fallacious.ANT.: true, valid, unquestionable, genuineIV(Roget's Thesaurus II) adjective 1. Containing fundamental errors in reasoning: fallacious, false, illogical, invalid, sophistic, spurious, unsound. See CORRECT, TRUE. 2. Devoid of truth: counterfactual, false, spurious, truthless, untrue, untruthful, wrong. See TRUE.
English dictionary for students. 2013.