Thesaurus.com
Dictionary.com
Showing results for unthinkable. Search instead for unthinkabl.
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

"And it is unthinkable - but those thoughts demand to be thought and I will not hide my face. But she needs to come home now."

From BBC • Mar. 25, 2026

It is to ensure that the cost of starting one remains permanently unthinkable.

From The Wall Street Journal • Mar. 24, 2026

An all but unthinkable thought crossed Caesar’s mind for the first time.

From "Tiger, Tiger" by Lynne Reid Banks

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