Etymology

preposterous

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Today it means: Absurd, or contrary to common sense. Full definition →

Latin praeposterus
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The story

  1. Latin · derived frompraeposterus“with the hinder part before, reversed, inverted, perverted”
  2. English todaypreposterous

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

Etymology from Wiktionary, CC BY-SA 4.0.