unimaginable

adjective

un·​imag·​in·​able

ˌən-ə-ˈmaj-nə-bəl,

-ˈma-jə- 

: not imaginable or comprehensible

unimaginable horror

unimaginably

ˌən-ə-ˈmaj-nə-blē

-ˈma-jə 

adverb

Synonyms

• incredible
• incredulous
• unlikely
• impossible
• inconceivable
• unthinkable
• unbelievable
• fantastical

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

In Ukraine, low-cost, high-impact drones are enabling Ukraine not only to defend itself but to strike deep into Russian territory (and Russia into Ukraine) in ways that would have been unimaginable just a few years ago. —Charles Beames, Forbes.com, 11 July 2025

Our hearts are broken alongside our families that are enduring this unimaginable tragedy. —Sara Vallone Mod Moms Club updated July 9, Miami Herald, 9 July 2025

Both can create visual expanses that make the unimaginable universe seem a little more coherent and tangible while somehow normalizing concepts once confined to fantasy. —Monisha Ravisetti, Space.com, 8 July 2025

No parent should ever have to endure the unimaginable pain of losing a child to drowning. —Karen Cohn, The Orlando Sentinel, 7 July 2025

Word History

First Known Use

1611, in the meaning defined above

Rhymes for unimaginable

• imaginable