immovable, invulnerable, unconquerable, secure; see safe 1, strong 2.
"impregnable." YourDictionary, n.d. Web. 20 April 2019. <https://thesaurus.yourdictionary.com/impregnabLE>.
impregnable. (n.d.). Retrieved April 20th, 2019, from https://thesaurus.yourdictionary.com/impregnabLE
Incapable of being conquered, overrun, or subjugated:
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