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Adjective: unassailable  ,ún-u'sey-lu-bul
  1. Immune to attack; incapable of being tampered with
    "an unassailable fortress";
    - impregnable, inviolable, secure, strong, unattackable
  2. Impossible to assail
    - untouchable
  3. Without flaws or loopholes
    - unshakable, watertight, bulletproof, ironclad, unshakeable

See also: incontestable, incontestible, inviolable, invulnerable, irrefrangible