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.

Positions they hold tomorrow may be inconceivable today.

From The Wall Street Journal • May 28, 2026

The idea of separating her family, Janie says, was "simply inconceivable", even if she had to leave behind her life in Missouri and start a new life in a country completely unknown to her.

From BBC • Apr. 24, 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 an inconceivable question—no one even knew what DNA was!”

From "The Immortal Life of Henrietta Lacks" by Rebecca Skloot

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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