- illogical
- I(New American Roget's College Thesaurus)II(Roget's IV) modif.Syn. irrational, unreasonable, absurd, specious, fallacious, sophistical, inconsequent, unsubstantial, incorrect, inconsistent, false, flawed, casuistic, unscientific, paralogistic, contradictory, untenable, unsound, preposterous, invalid, self-contradictory, Kafkaesque, unproved, groundless, baseless, implausible, hollow, irrelevant, inconclusive, fatuous, senseless, incongruous, prejudiced, biased, unconnected, without foundation, not following, out of bounds, without basis, without rhyme or reason*, nutty*, screwy*, not ringing true*, wacky*, far out*, dopey*, having the cart before the horse*, Jesuitical*; see also fallible , wrong 2 .Ant. sound, reasonable, logical*.III(Roget's 3 Superthesaurus) a.unscientific, unsound, fallacious, senseless, wacky, *screwy, inconsistent, invalid, incongruous, unreasonable, wrong, irrational, *cockeyed.ANT.: sound, correct, logicalIV(Roget's Thesaurus II) adjective 1. Containing fundamental errors in reasoning: fallacious, false, invalid, sophistic, specious, spurious, unsound. See CORRECT, TRUE. 2. Not governed by or predicated on reason: irrational, unreasonable, unreasoned. Idiom: out of bounds. See REASON.
English dictionary for students. 2013.