Meaning of preposterous

pre•pos•ter•ous

Pronunciation: (pri-pos'tur-us, -trus), [key]
— adj.
  1. completely contrary to nature, reason, or common sense; absurd; senseless; utterly foolish: a preposterous tale.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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