Preposterous
Synonyms for preposterous
adj ridiculous, bizarre
    insane
    unbelievable
    excessive
    irrational
    incredible
    unthinkable
    fantastic
    ludicrous
    senseless
    unreasonable
    crazy
    outrageous
    stupid
    silly
    absurd
    impossible
    laughable
    foolish
    nonsensical
    shocking
    asinine
    exorbitant
    extravagant
    extreme
    far-out
    harebrained
    monstrous
    out of the question
    thick
    too much
    unusual
    wacky
    wild
    taking the cake
Antonyms for preposterous
    rational
    sane
    believable
    credible
    plausible
    logical
    sensible
    possible
    tenable
    intelligent
    wise
    balanced
    reasonable
    sound
    realistic
    bad
    poor
    plain
    practical
    responsible
    smart
    good
    serious
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