unspeakable

adjective

un·​speak·​able ˌən-ˈspē-kə-bəl 

1

a

: incapable of being expressed in words : unutterable

… each heaved a sigh of unspeakable relief.

—Frank Norris

b

: inexpressibly bad : horrendous

unspeakable living conditions

unspeakable evil

2

: that may not or cannot be spoken

… the bawdy thoughts that come into one's head—the unspeakable words …

—L. P. Smith

unspeakable collections of consonants

—Rosemary Jellis

unspeakably

ˌən-ˈspē-kə-blē 

adverb

Synonyms of unspeakable

• incredible
• indescribable
• unutterable
• ineffable
• inexpressible
• incommunicable
• indefinable

Examples of unspeakable in a Sentence

the unspeakable horror of war

continually encountered unspeakable beauty in their travels through the Alps

Recent Examples on the Web

For years, these women carried the weight of unspeakable atrocities while others tried to bury the truth. —Anna Commander, MSNBC Newsweek, 21 Nov. 2025

Incomparable gravitas, unspeakable wrath, undeniable power — does this remind you of anyone? —Fran Hoepfner, Vulture, 20 Nov. 2025

Tufford described Kirk's actions as unspeakable. —David Clarey, jsonline.com, 12 Nov. 2025

Because to accept Douglas Kelley's conclusions that the capacity for the most unspeakable atrocity is latent in our own reality is shockingly quotidian and perhaps too frightening to hear; a responsibility too terrible to accept and yet too prescient to ignore. —NPR, 11 Nov. 2025

Word History

First Known Use

14th century, in the meaning defined at sense 1a

Kids Definition

unspeakable

adjective

un·​speak·​able ˌən-ˈspē-kə-bəl 

ˈən-

1

: impossible to express in words

unspeakable beauty of the sunset

2

: extremely bad

unspeakable conduct

unspeakably

-blē 

adverb