inexpugnability (ˌinexˌpugnaˈbility) or inexpugnableness (ˌinexˈpugnableness)
noun
inexpugnably (ˌinexˈpugnably)
adverb
inexpugnable in American English
(ˌɪnɛksˈpʌgnəbəl; ˌɪnɪkˈspʌgnəbəl)
adjective
that cannot be defeated by force; unconquerable; unyielding
Derived forms
inexpugnableness (ˌinexˈpugnableness)
noun
inexpugnably (ˌinexˈpugnably)
adverb
Word origin
LME < MFr < L inexpugnabilis < in-, not + expugnabilis, that can be taken by storm < expugnare, to take by storm < ex-, intens. + pugnare, to fight: see pugnacious