Longman Dictionary of Contemporary English homepage

Date: 1500-1600
Language: Latin
Origin: praeposterus 'with the back part in front', from prae- ( PRE-) + posterus ( POSTERIOR1)

preposterous

 adjective
     
pre‧pos‧ter‧ous formal
completely unreasonable or silly [= absurd]:
The whole idea sounds absolutely preposterous!
—preposterously adverb
—preposterousness noun [uncountable]
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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