Preposterous Definition

With the first last and the last first; inverted.
Webster's New World
So contrary to nature, reason, or common sense as to be laughable; absurd; ridiculous.
Webster's New World

Origin of Preposterous

  • From Latin praeposterus inverted, unseasonable prae- pre- posterus coming behind (from post behind apo- in Indo-European roots)

    From American Heritage Dictionary of the English Language, 5th Edition

  • From Latin praeposterus (“with the hinder part before, reversed, inverted, perverted"), from prae (“before") + posterus (“coming after").

    From Wiktionary

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