Synonyms of impregnable in English:

impregnable

adjective

  • 1 such a castle must have been impregnable
    invulnerable, impenetrable, unattackable, unassailable, inviolable, secure, strong, stout, safe, well fortified, well defended; invincible, unconquerable, unbeatable, indestructible
    [Antonyms] vulnerable
  • 2 an impregnable parliamentary majority
    [Antonyms] vulnerable
  • 3 as a working theory, this is impregnable
    [Antonyms] flawed
  • Definition of impregnable in:

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