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Definitions

unthinkable

[uhn-thing-kuh-buhl] / ʌnˈθɪŋ kə bəl /
ADJECTIVE
incredible, unusual
Synonyms
STRONGEST
absurd extraordinary illogical implausible impossible improbable inconceivable preposterous rare unbelievable uncommon unimaginable unlikely unreasonable
WEAK
beyond belief beyond possibility exceptional incogitable insupportable out of the question outlandish singular unique unordinary
Antonyms
STRONGEST
believable cheap common familiar imaginable likely logical normal ordinary plausible possible probably rational reasonable regular sensible tenable usual
WEAK
conceivable credible

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.

Or it may need to consider the unthinkable.

From The Wall Street Journal • Apr. 4, 2026

For the four-time winners it seems almost unthinkable they would fall short.

From BBC • Mar. 26, 2026

Just a year ago, the idea of commodity-sensitive energy companies reaching these valuations would have been unthinkable.

From MarketWatch • Mar. 25, 2026

At the end of Euro 2024, it was unthinkable that Jude Bellingham's starting place would be a subject of debate for the 2026 World Cup.

From BBC • Mar. 20, 2026

It was a time when the unthinkable became thinkable and the impossible really happened.

From "The God of Small Things" by Arundhati Roy

From Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.