Impregnable
/ɪmˈpɹɛɡnəbəl/
adjective
(of a fortress, wall, etc., also used figuratively) Too strong to be penetrated.
impregnable
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/ɪmˈpɹɛɡnəbəl/
(of a fortress, wall, etc., also used figuratively) Too strong to be penetrated.
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