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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.

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

From BBC • Mar. 26, 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

“The significant damage to critical energy infrastructure alongside the collapse in ship volume through the Strait of Hormuz were both unthinkable 3 weeks ago. Both are now realities,” the firm says.

From MarketWatch • Mar. 20, 2026

See: It was unthinkable a couple of weeks ago, but could the next move by the Fed be a rate hike?

From MarketWatch • Mar. 18, 2026

He wanted to embrace his guardian, to hold him and tell him that he would never desert him, but the action was unthinkable.

From "The Graveyard Book" by Neil Gaiman

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