inexpugnable
a. வெல்லுதற்கரிய, தாக்கிக் கைப்பற்ற முடியாத.
In`ex*pug"na*ble, a. Etym: [L. inexpugnabilis: cf. F. inexpugnable. See In- not, and Expugnable.] Defn: Incapable of being subdued by force; impregnable; unconquerable. Burke. A fortress, inexpugnable by the arts of war. Milman.