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

The Lunar New Year today greets us with the Year of the Horse, an animal celebrated for its vigor, confidence, and an unshakable belief that speed alone constitutes direction. —Voice Of The People, New York Daily News, 17 Feb. 2026

The heat remains between Cathy and Heathcliff, and this unshakable bond ensures their mutual destruction. —Radhika Seth, Vogue, 9 Feb. 2026

In short, investors are questioning the once-unshakable dominance of software and tech. —Benzinga, Freep.com, 7 Feb. 2026

This unshakable belief in his own self-sovereignty offers a welcome contrast to the islanders’ inherent fear of change. —Los Angeles Times, 30 Jan. 2026

Word History

First Known Use

1611, in the meaning defined above

Rhymes for unshakable

• breakable
• unbreakable
• unmistakable