From Longman Dictionary of Contemporary Englishpreposterouspre‧pos‧ter‧ous /prɪˈpɒstərəs $ -ˈpɑːs-/ adjective formal STUPID/NOT SENSIBLEcompletely unreasonable or silly SYN absurd The whole idea sounds absolutely preposterous! —preposterously adverb —preposterousness noun [uncountable]
Examples from the Corpus
preposterous• So what Raskin proposed actually seemed preposterous.• Ticket prices for football games are absolutely preposterous!• But that said, the diesel costs £16,600, which is downright preposterous.• The very idea is preposterous and I was overjoyed to see that you believed me.• Tuesday, Rana Kern again called those allegations preposterous, and said that as a pagan she worships the Earth.• Daunting and preposterous as the task appeared, I was glad to be busy again, of use.• It sounded utterly preposterous but it led to a longer silence.• It's a preposterous claim that the government is trying to poison its citizens.• a preposterous excuse• Many voters are ready to believe anything of them both, no matter how preposterous or sinister.• It is preposterous that Bruce did not know that we were there.• It seems preposterous that Bruce did not know we were there.Origin preposterous (1500-1600) Latin praeposterus “with the back part in front”, from prae- ( → PRE-) + posterus ( → POSTERIOR1) 