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.

With the recent influx of institutional capital into the space economy, previously inconceivable technological advancements are suddenly within reach.

From MarketWatch • Jun. 10, 2026

The pundits thought it was inconceivable when Donald Trump announced his run for the presidency in 2015.

From Los Angeles Times • May 18, 2026

It is not inconceivable Rew, Gay and McKinney all line up against the Proteas second string.

From BBC • Apr. 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

The steel ran south and north presumably, springing from some inconceivable source and shooting toward a miraculous terminus.

From "The Underground Railroad: A Novel" by Colson Whitehead

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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