- completely contrary to nature, reason, or common sense; absurd; senseless; utterly foolish: a preposterous tale.
Origin of preposterous
SynonymsSee more synonyms on Thesaurus.com
Examples from the Web for preposterous
I am genuinely curious if any of the preposterous ramifications of what he is saying even occur to Kennedy.Robert F. Kennedy Jr.’s Twisted Anti-Vaxx History
July 23, 2014
I found the whole idea so preposterous I even Tweeted about it.Celiac or Not, Gluten Free Dish Soap Is Ridiculous
July 16, 2014
By 1994, the league slugging percentage was a preposterous .424, the highest since 1930.Are Athletes Using Your Tax Dollars to Juice?
May 2, 2014
“Trying to patch the current system is preposterous and destined for failure,” said Dr. Damania.The Health-Care System Is So Broken, It’s Time for Doctors to Strike
April 29, 2014
Marchman takes it as a given that MLB basing its case on the say-so of a sketchy Floridian drug-dealer is preposterous.Major League Baseball Is Right to Punish the Biogenesis Cheats
Michael Brendan Dougherty
June 6, 2013
How preposterous in him to mention his dead sister's name to her!Ester Ried Yet Speaking
It was to him preposterous, for she was one of that underworld against which he was ruthlessly at war.Within the Law
They created the most preposterous romances; and could not get the credit of creating them.Alarms and Discursions
G. K. Chesterton
What proof have you, woman, of your preposterous allegation?
All too fearfully I divined their preposterous significance.Ruggles of Red Gap
Harry Leon Wilson
- contrary to nature, reason, or sense; absurd; ridiculous
Word Origin and History for preposterous
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.