Inexpugnable
Inexpugnable , adjective
[Latin inexpugnabilis: compare French inexpugnable. See In- not, and Expugnable.]
Incapable of being subdued by force; impregnable; unconquerable. — Burke
A fortress, inexpugnable by the arts of war.
Inexpugnable , adjective
[Latin inexpugnabilis: compare French inexpugnable. See In- not, and Expugnable.]