unattackable

Adjective
  1. Immune to attack;
    Incapable of being tampered with (synset 302536283)
    "an impregnable fortress"; "fortifications that made the frontier inviolable"; "a secure telephone connection"
    similar to: invulnerable - immune to attack; impregnable
    same as: impregnable, inviolable, secure, strong, unassailable

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