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Adjective: unshakeable  ,ún'shey-ku-b(u)l
  1. Marked by firm determination or resolution; not shakable
    "unshakeable convictions";
    - firm, steadfast, steady, stiff, unbendable, unfaltering, unshakable, unwavering
  2. Without flaws or loopholes
    - unassailable, unshakable, watertight, bulletproof, ironclad

See also: incontestable, incontestible, resolute

Encyclopedia: Unshakeable