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.

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

Two men broke a previously inconceivable barrier at the London Marathon on Sunday, both running 26.2 miles in under two hours and smashing the world record.

From The Wall Street Journal • Apr. 26, 2026

"She will have seen just as much as Andrew. It's inconceivable that she didn't. She was so matey with Epstein."

From BBC • Mar. 20, 2026

Paramount has set a closing target date of Sept. 30, although the deal faces several regulatory hurdles, so it is not inconceivable that it will get pushed past that date.

From MarketWatch • Mar. 17, 2026

It was inconceivable to me that one should surrender to what seemed wrong, and most of the people I had met seemed wrong.

From "Black Boy" by Richard Wright

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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