— inexpugnability, inexpugnableness , n. — inexpugnably , adv.
/in'ik spug"neuh beuhl/ , adj.
incapable of being taken by force; impregnable; unconquerable.
[ 1375-1425; late ME inexpugnabilis, equiv. to in- IN- 3 + expugnabilis ( expugna ( re ) to take by storm ( ex- EX- 1 + pugnare to fight) + -bilis -BLE) ]