Etymology
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unshakable (adj.)

1610s; see un- (1) "not" + shake (v.) + -able. Of beliefs, etc., from 1670s.

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Definitions of unshakable

unshakable (adj.)
marked by firm determination or resolution; not shakable;
Synonyms: firm / steadfast / steady / stiff / unbendable / unfaltering / unwavering
unshakable (adj.)
without flaws or loopholes;
Synonyms: unassailable / watertight / bulletproof
From wordnet.princeton.edu