Definitions

preposterous

[pri-pos-ter-uhs, -truhs] / prɪˈpɒs tər əs, -trəs /

ADJECTIVE

ridiculous, bizarre

Synonyms

STRONGEST

absurd crazy excessive fantastic foolish impossible incredible insane irrational laughable ludicrous nonsensical outrageous senseless shocking silly stupid unbelievable unreasonable unthinkable

WEAK

asinine exorbitant extravagant extreme far-out harebrained monstrous out of the question taking the cake thick too much unusual wacky wild

Antonyms

STRONGEST

bad balanced believable credible good intelligent logical plain plausible poor possible practical rational realistic reasonable responsible sane sensible serious smart sound tenable wise

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

The series is wildly atmospheric with plenty of gallows humor and more than a few truly loopy plotlines, but great fun with Davis managing, as ever, to sell even the most preposterous scene.

From Los Angeles Times • Jun. 8, 2026

He posits that all the various forms of our modern alienation are connected, drawing throughlines that are both preposterous and incisive as he shows his work.

From Salon • May 22, 2026

But even a voluntary scheme to cut costs was described by Marks & Spencer's chief executive, Stuart Machin, as "completely preposterous".

From BBC • May 21, 2026

It’s preposterous to think that, even with the best of intentions on both sides, a peace as complicated as this could have been settled in one day.

From Slate • Apr. 13, 2026

While he groused about so preposterous an idea, the kid laid down the mat he never used, bulldogged him down to it, pulled off his shoes and draped a blanket over him.

From "Maniac Magee" by Jerry Spinelli

Vocabulary lists containing preposterous

Holes

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"The Hunger Games" Vocabulary from Chapter 1

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