Meaning of “preposterous” in the English Dictionary

british dictionary

"preposterous" in American English

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preposterousadjective

us /prɪˈpɑs·tər·əs/

completely unreasonable and ridiculous; not to be believed:

It was a preposterous idea, and no one took it seriously.

(Definition of “preposterous” from the Cambridge Academic Content Dictionary © Cambridge University Press)