unimaginable

adjective

un·​imag·​in·​able

ˌən-ə-ˈmaj-nə-bəl, 

-ˈma-jə- 

: not imaginable or comprehensible

unimaginable horror

technology that was unimaginable only a few years ago

unimaginably

ˌən-ə-ˈmaj-nə-blē, 

-ˈma-jə 

adverb

Synonyms of unimaginable

• incredible
• incredulous
• unlikely
• impossible
• inconceivable
• unthinkable
• unbelievable

Examples of unimaginable in a Sentence

the unimaginable horrors of war

a disaster of almost unimaginable proportions

This technology would have been unimaginable five years ago.

Recent Examples on the Web

And The Chapter Aaliyah Never Got to Finish The story of Aaliyah is forever connected to both an extraordinary creative breakthrough and an unimaginable loss. — Desjah Altvater, Forbes.com, 17 July 2026

More recently, molecular paleontologist Jasmina Wiemann and her collaborators have identified chemical traces preserved in fossil bone, eggshell and skin that reveal aspects of dinosaur biology unimaginable even a generation ago. — Kristi Curry Rogers, The Conversation, 14 July 2026

Then one thoughtful gesture put them on an unimaginable path. — Faith Karimi, CNN Money, 11 July 2026

An unimaginable weight rested on his shoulders when Alfonzo stepped into the batter’s box to a standing ovation. — Assistant Sports Editor, Los Angeles Times, 6 July 2026

Word History

First Known Use

1611, in the meaning defined above

Rhymes for unimaginable

• imaginable