01 a. Incapable of being subdued by force; impregnable; unconquerable.
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1.
Incapable of being subdued by force; impregnable; unconquerable.“A fortress, inexpugnable by the arts of war.” — Milman.
Entry
1 sense
Webster, 1913
Inexpugnable
· In·ex·pug·na·ble
· IPA /ˌɪnɛkˈspʌɡnəbəl/