preposterous Synonyms

absurd irrational foolish nonsensical laughable ludicrous cockeyed derisory idiotic ridiculous squinter wrong unreasoned unreasonable unreal self-contradictory unlikely senseless silly uncredible unconscionable sophistic teratoid stupid tomfool feebleminded unreasoning imbecilic surrealistic unimaginable out of the question softheaded unachievable unconvincing unrealizable cockamamie unthinkable unworkable blue sky harebrained ill-conceived moronic fairytale nonrational half-baked unbelievable unscientific sappy risible illogical