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

If dinosaurs were strong and intelligent — if humans didn’t really deserve to inherit the Earth from them — then their death in a cosmic freak accident represents unimaginable loss. —Scottie Andrew, CNN Money, 5 Apr. 2026

Now we’re bifurcated, with roughly a third of our households not meeting self-sufficiency standards, and more than a third achieving wealth that was unimaginable a generation ago. —Russell Hancock, Mercury News, 4 Apr. 2026

David Kennedy has spent more than 27 years at Dell Technologies—an almost unimaginable tenure in an era when many Gen Z workers see changing companies as the surest path to advancement. —Sheryl Estrada, Fortune, 3 Apr. 2026

Three sisters in Big Bear Lake are bracing for the unimaginable — losing both parents. —Ruben Vives, Los Angeles Times, 3 Apr. 2026

Word History

First Known Use

1611, in the meaning defined above

Rhymes for unimaginable

• imaginable