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

Some online have pledged to never ride a roller coaster again, too fearful of the unimaginable horror of falling out. — Taylor Croft, AJC.com, 14 Oct. 2026

China has since created spacecraft for communications; navigation; and intelligence, surveillance, and reconnaissance that would have been unimaginable to PLA officials who observed Desert Storm. — Kathleen Curlee, Foreign Affairs, 14 Oct. 2026

In fractured times, in a national media scrum unimaginable just a few decades ago, what is the proper way to approach a job like this? — ABC News, 14 Oct. 2026

The new mountaineering movies are delirious vicarious cinema, employing technological means and a filmmaking bravado that comes with them that would have been unimaginable three or four decades ago. — Owen Gleiberman, Variety, 10 Oct. 2026

Word History

First Known Use

1611, in the meaning defined above

Rhymes for unimaginable

• imaginable