Definitions

inconceivable

[in-kuhn-see-vuh-buhl] / ˌɪn kənˈsi və bəl /

ADJECTIVE

beyond reason, belief

Synonyms

STRONGEST

extraordinary implausible impossible improbable incredible mind-boggling strange unbelievable unheard-of unimaginable unthinkable

WEAK

fantastic incogitable incomprehensible insupposable phony rare reachy staggering thin unconvincing unknowable unlikely unsubstantial weak won't fly won't wash

Antonyms

STRONGEST

believable common credible familiar likely normal plausible possible reasonable tenable usual

WEAK

conceivable fathomable imaginable

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.

It was an obviously exaggerated way of describing an inconceivable fortune—like calling someone a bazillionaire.

From The Wall Street Journal • Jun. 11, 2026

For so long, it has felt inconceivable to not have Heather Knight as the first name on the England team sheet.

From BBC • May 28, 2026

Positions they hold tomorrow may be inconceivable today.

From The Wall Street Journal • May 28, 2026

“It seems inconceivable to me that we would voluntarily relinquish the leadership that has propelled our country, fueled the economy, made us healthier, and made us safer,” he said.

From Los Angeles Times • May 6, 2026

Even if the legendary Brotherhood existed, as just possibly it might, it was inconceivable that its members could ever assemble in larger numbers than twos and threes.

From "1984" by George Orwell

Vocabulary lists containing inconceivable

The Diary of Anne Frank

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Essential Academic Vocabulary for High School Students, List 2

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List 3

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