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

Inter of Italy and Spain’s Barcelona were possible destinations, but instead Campbell shocked English football and caused unimaginable consternation and fury… by joining Arsenal. — Tim Spiers, New York Times, 9 Aug. 2026

The idea that millions of people would one day communicate, shop, learn, and build businesses online sounded almost unimaginable. — Ted Leonsis, Fortune, 8 Aug. 2026

On top of the unimaginable grief of losing her child, Baustert has been dragged through an ongoing legal marathon in her fight to hold her daughter's alleged attackers accountable. — Kelsie Cairns, FOXNews.com, 6 Aug. 2026

Possessing a previously unimaginable degree of naturalism, Raphael’s Madonnas appear to think and feel. — Carmen Rosenberg-Miller, Artforum, 6 Aug. 2026

Word History

First Known Use

1611, in the meaning defined above

Rhymes for unimaginable

• imaginable