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

Teague underscored that fans expect to be part of the action in ways that were unimaginable to their parents and grandparents. — Cynthia Littleton, Variety, 15 Aug. 2026

After the fall of the Soviet Union in 1991, Republicans took a victory lap, rightly noting that the Soviet collapse was unimaginable when President Ronald Reagan first took office. — Tom Nichols, The Atlantic, 14 Aug. 2026

Five 17-year-old friends were killed when their vehicle plunged off a cliff and down a steep Colorado hillside, leaving their families and community grappling with an unimaginable loss just as a new school year begins. — Stepheny Price, FOXNews.com, 12 Aug. 2026

At its center are the unimaginable deaths of three young children and a mother whose mental state has become the subject of intense legal, medical, and public scrutiny. — Jamie Maguire, STAT, 12 Aug. 2026

Word History

First Known Use

1611, in the meaning defined above

Rhymes for unimaginable

• imaginable