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.

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

From MarketWatch • Jun. 10, 2026

Positions they hold tomorrow may be inconceivable today.

From The Wall Street Journal • May 28, 2026

“All the ticket prices in this World Cup are inconceivable for previous World Cups,” Kuper said.

From Los Angeles Times • May 23, 2026

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

From BBC • Apr. 28, 2026

Such a book is simply inconceivable within a manuscript culture.

From "The Invention of Science" by David Wootton

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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