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

Thank you to the trauma physicians and surgeons who care for unimaginable injuries, each a devastating story. — Robert M. Kinast, STAT, 3 Nov. 2026

Centered in large part around the Warsaw Ghetto, the novel brought to life the daily struggles, fears, and remarkable courage of Jewish families living under unimaginable conditions. — Lois K. Solomon, Sun Sentinel, 2 Nov. 2026

The history of organic abstraction that runs through Jean Arp and Henry Moore is unimaginable without the inner vitality of Brancusi’s rounded shapes. — Michael Brenson, Vogue, 1 Nov. 2026

Her death at 49 left Morrison and the filmmakers grappling with an unimaginable loss — and facing difficult questions about whether their documentary should continue at all. — Nigel Smith, PEOPLE, 30 Oct. 2026

Word History

First Known Use

1611, in the meaning defined above

Rhymes for unimaginable

• imaginable