Synonyms of preposterous in English:

preposterous

adjective

  • absurd, ridiculous, foolish, stupid, ludicrous, farcical, laughable, comical, risible, hare-brained, asinine, inane, nonsensical, pointless, senseless, insane, unreasonable, irrational, illogical; outrageous, shocking, astonishing, monstrous, unbelievable, incredible, unthinkable
    informal crazy
    [Antonyms] reasonable sensible
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