unshakable

Meanings

1. 1
   adj

   of a belief, fact, relationship, or system, so firm or secure that it cannot easily be weakened, changed, or disproved

   The theory looked unshakable until a more precise experiment exposed its limits.

2. 2
   adj

   showing determination or confidence that cannot be weakened

   She remained unshakable in her decision despite months of criticism.

Formed in English from un- ("not") + shakable, itself shake + -able. Unshakable is the usual American spelling; unshakeable is common in British English. The figurative senses extend the physical idea of something that cannot be shaken.

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