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 brand also carries a dark legacy and an unshakable association with its disgraced cofounder, Harvey Weinstein. — Andrew McGowan, Fortune, 1 Oct. 2026

The trailer also teases Fielder getting some FaceTime with Holmes’s husband, Billy Evans, who appears to have an unshakable belief in his wife. — Jason P. Frank, Vulture, 23 Sep. 2026

An unshakable moat The industrial gas ecosystem is driven by broad secular trends, including the reshoring of manufacturing, advanced semiconductor nodes and carbon capture infrastructure. — Harvey Stober, CNBC, 15 Sep. 2026

The book’s post-apocalyptic setting ennobles its meditations on selfhood and finitude; the narrator’s search for perpetuity is lent an unshakable gravity by her circumstances. — Katy Waldman, New Yorker, 3 Aug. 2026

Word History

First Known Use

1611, in the meaning defined above

Rhymes for unshakable

• breakable
• unbreakable
• unmistakable