Synonyms of impregnable in English:

impregnable

adjective

  • 1 the fortress is impregnable
    invulnerable, impenetrable, unassailable, inviolable, secure, strong, well fortified, well defended; invincible, unconquerable, unbeatable, indomitable, indestructible
    [Antonyms] vulnerable
  • 2 he displayed a calm, impregnable certainty
    [Antonyms] shaky vulnerable
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