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.

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

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

But he has begun the season with his most preposterous goal yet: MLB’s best hitter also wants to be recognized as MLB’s best pitcher.

From The Wall Street Journal • Apr. 11, 2026

Patel’s preposterous partying with the U.S. men’s hockey team while war-planning was underway in Washington was widely, justifiably mocked.

From Los Angeles Times • Mar. 12, 2026

That I proposed to climb to the cruising altitude of an Airbus 300 jetliner struck me, at that moment, as preposterous, or worse.

From "Into Thin Air" by Jon Krakauer

Vocabulary lists containing preposterous

Holes

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