01 a. Having that first which ought to be last; inverted in order.
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1.
Having that first which ought to be last; inverted in order.[Obs.]“The method I take may be censured as preposterous, because I thus treat last of the antediluvian earth, which was first in the order of nature.” — Woodward.
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2.
Contrary to nature or reason; not adapted to the end; utterly and glaringly foolish; unreasonably absurd; perverted.“Preposterous ass, that never read so far!” — Shak.