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

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

From Los Angeles Times • May 18, 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

Laughter in the presence of an Egyptian sphinx or an Assyrian bird-beast was inconceivable; but it was perfectly natural in Olympus, and it made the gods companionable.

From "Mythology: Timeless Tales of Gods and Heroes" by Edith Hamilton

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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