Inexpugnable
Pronunciation : In`ex*pug"na*ble
Part of Speech : a.
Etymology : [L. inexpugnabilis: cf. F. inexpugnable. See In- not, and Expugnable.]
Definition : Defn: Incapable of being subdued by force; impregnable; unconquerable. Burke. A fortress, inexpugnable by the arts of war. Milman.
Source : Webster's Unabridged Dictionary, 1913