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

Palestinians in the territory said their suffering over the past three years had previously been unimaginable. — Melanie Lidman, Los Angeles Times, 7 Oct. 2026

Gemma and Alice have a friendly exchange that would have been unimaginable in the early parts of the season. — Keith Phipps, Vulture, 7 Oct. 2026

Independent businesses that once depended on customers walking through their doors gained the opportunity to reach shoppers anywhere, competing with national chains in ways that would have been unimaginable before. — Dax Dasilva, Fortune, 2 Oct. 2026

Mathematicians, for example, investigate which geometric objects could exist in these unimaginable environments and how they can be ordered and measured. — Manon Bischoff, Scientific American, 22 Sep. 2026

Word History

First Known Use

1611, in the meaning defined above

Rhymes for unimaginable

• imaginable