unshakable

adjective

un·​shak·​able ˌən-ˈshā-kə-bəl 

: not possible to weaken or get rid of : not able to be shaken

an unshakable habit

unshakable determination/opposition

unshakably

ˌən-ˈshā-kə-blē 

adverb

Switzerland is as unshakably opposed to sanctions as ever: neutrality, the Swiss claim, requires it.

—The Economist

Synonyms of unshakable

• calm
• serene
• nonchalant
• unflappable
• imperturbable
• composed
• nerveless
• unshaken
• cool
• collected

Examples of unshakable in a Sentence

we need the kind of leader who will be unshakable in a national crisis

Recent Examples on the Web

Once that nucleus is stable, the processes are set and the culture is unshakable; the transition to a more remote or hybrid model should become much more viable. —Vikram Joshi, Forbes.com, 1 June 2026

Zulfi is an iconoclast and a hustler, a man who dreams of opening a Muslims-only version of Uber and who, even in the face of Shah’s elitism and English society’s broader wariness, holds onto an unshakable optimism. —Joe Reid, Vulture, 29 May 2026

The Vegas Golden Knights’ stunning comeback win over the Colorado Avalanche on Sunday night was only possible because of a seemingly unshakable composure. —Jesse Granger, New York Times, 25 May 2026

Lauren, Kawakubo, Yamamoto—they’re a powerful trinity, all possessing unshakable visions that continue to shape culture. —Laird Borrelli-Persson, Vogue, 7 May 2026

Word History

First Known Use

1611, in the meaning defined above

Rhymes for unshakable

• breakable
• unbreakable
• unmistakable