preposterous preposterous /prɪˈpɑːstrəs/

adjective

1. () So unreasonable as to invite derision  ( cockeyed [Informal] , derisory , idiotic , absurd , laughable , ludicrous , nonsensical , preposterous , ridic [Informal] , ridiculous )
   so unreasonable as to invite derision
    The absurd excuse that the dog ate his homework
   the absurd excuse that the dog ate his homework
    That's a cockeyed idea
   that's a cockeyed idea
    Ask a nonsensical question and get a nonsensical answer
   ask a nonsensical question and get a nonsensical answer
    A contribution so small as to be laughable
   a contribution so small as to be laughable
    It is ludicrous to call a cottage a mansion
   it is ludicrous to call a cottage a mansion
    A preposterous attempt to turn back the pages of history
   a preposterous attempt to turn back the pages of history
    Her conceited assumption of universal interest in her rather dull children was ridiculous
   her conceited assumption of universal interest in her rather dull children was ridiculous