Synonyms of preposterous in English:

preposterous

adjective

  • 1 at these sessions, no ideas are too preposterous to throw on the table
    outrageous, monstrous
    informal crazy
    [Antonyms] sensible
  • Definition of preposterous in:

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    Word of the day flagitious
    Pronunciation: fləˈdʒɪʃəs
    adjective
    (of a person or their actions) criminal; villainous