Dictionary

preposterous

adjective pre·pos·ter·ous \pri-ˈpäs-t(ə-)rəs\

: very foolish or silly

Full Definition of PREPOSTEROUS

:  contrary to nature, reason, or common sense :  absurd
pre·pos·ter·ous·ly adverb
pre·pos·ter·ous·ness noun

Examples of PREPOSTEROUS

  1. The whole idea is preposterous!
  2. <the idea that extraterrestrials built the pyramids is preposterous>

Origin of PREPOSTEROUS

Latin praeposterus, literally, in the wrong order, from prae- + posterus hinder, following — more at posterior
First Known Use: 1542

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