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1. Having that first which ought to be last; inverted in order.

2. Contrary to nature or reason; not adapted to the end; utterly and glaringly foolish; unreasonably absurd; perverted.

See: absurd.

Synonym: absurd, perverted, wrong, irrational, foolish, monstrous.

Origin: L. Praeposterus; prae = before _ posterus coming after, latter. See Posterior.