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

Having to balance coverage of this unimaginable tragedy with more typical Housewives scenes is a remarkably tricky balancing act, but one that the show handles well. — Tom Smyth, Vulture, 17 Sep. 2026

The men, women and children who have been killed, starved, displaced and forced to live through unimaginable violence. — William Earl, Variety, 14 Sep. 2026

But, to most people, avian migrations of that length were long unimaginable. — Rivka Galchen, New Yorker, 14 Sep. 2026

Today, virtually every company regardless of size or budget can quickly produce blogs, emails, social media posts, videos and personalized campaigns at a scale that was unimaginable just a few years ago. — Drew Holmgreen, Forbes.com, 14 Sep. 2026

Word History

First Known Use

1611, in the meaning defined above

Rhymes for unimaginable

• imaginable