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

Paul Peschisolido became Fulham’s first £1million signing, then Chris Coleman arrived for £2m — fees that had been unimaginable in the third tier. — James Pearce, New York Times, 22 July 2026

All because voters assumed that simply reaching the SEC Championship Game and beating Georgia was an unimaginable accomplishment. — Ian Miller Outkick, FOXNews.com, 21 July 2026

Still, that these high-tech systems exist at all provides a level of ease unimaginable to the emergency responders fighting the Big Burn more than a century ago. — K. R. Callaway, Scientific American, 20 July 2026

For the next 19 months, her world shrank to physical therapy sessions, hospital hallways and milestones that once would have seemed unimaginable. — Jordan Greene, PEOPLE, 20 July 2026

Word History

First Known Use

1611, in the meaning defined above

Rhymes for unimaginable

• imaginable