Pre-pŏs'ter-oŭs, a.

a. [Lat. præposterus, from præ, before, and posterus, coming after, latter; It. & Sp. prepostero, O. Fr. prepostere.] 1. Having that first which ought to be last; inverted in order. The method I take may be censured as preposterous, because I treat last of the antediluvian earth, which was first in the order of nature. Woodward. 2. Contrary to nature or reason; not adapted to the end; utterly and glaringly foolish; unreasonably absurd; perverted; wrong. “Most preposterous conclusions.” Shak. Though the error be easily fallen into, it is manifestly preposterous. I. Taylor. Syn.—Absurd; perverted; wrong; irrational; foolish, monstrous. See ABSURD.