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preposterous (adj.)

1540s, from Latin praeposterus "absurd, contrary to nature, inverted, perverted, in reverse order," literally "before-behind" (compare topsy-turvy, cart before the horse), from prae "before" + posterus "subsequent." Related: Preposterously; preposterousness.

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Definitions of preposterous from WordNet

preposterous (adj.)
so unreasonable as to invite derision;
a preposterous attempt to turn back the pages of history
From wordnet.princeton.edu