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Adjective: invulnerable  in'vúl-nu-ru-bul
  1. Immune to attack; impregnable
    "gunners raked the beach from invulnerable positions on the cliffs"

See also: airtight, air-tight, bombproof, defendable, defensible, entrenched, impregnable, inviolable, protected, safe, secure, shellproof, sheltered, strong, tight, unassailable, unattackable, unconquerable, untouchable

Antonym: vulnerable

Encyclopedia: Invulnerable