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preposterous

[pri-pos-ter-uh s, -truh s]
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adjective
  1. completely contrary to nature, reason, or common sense; absurd; senseless; utterly foolish: a preposterous tale.
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Origin of preposterous

First recorded in 1535–45, preposterous is from the Latin word praeposterus with the hinder part foremost. See pre-, posterior, -ous
Related formspre·pos·ter·ous·ly, adverbpre·pos·ter·ous·ness, nounun·pre·pos·ter·ous, adjectiveun·pre·pos·ter·ous·ly, adverbun·pre·pos·ter·ous·ness, noun

Synonyms

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unreasonable, excessive, ridiculous.

Synonym study

See absurd.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for preposterous

preposterous

adjective
  1. contrary to nature, reason, or sense; absurd; ridiculous
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Derived Formspreposterously, adverbpreposterousness, noun

Word Origin

C16: from Latin praeposterus reversed, from prae in front, before + posterus following
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for preposterous

adj.

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

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Online Etymology Dictionary, © 2010 Douglas Harper