irrational Synonyms

absurd foolish unreasonable senseless irrational number mad unfounded unreasoning unreasoned illogical insane ludicrous nonsensical inconsistent unthinking crazy crazed incoherent deranged silly preposterous baseless groundless unsensible unwarranted unsound unreason ridiculous risible self-contradictory sophistic sophistical stupid superstitious surd thoughtless unconsidered undiscerning unwise volatile untempered imbecilic unjustified ill-founded unjustifiable phobic unreflective unscientific unsubstantiated unthoughtful