adjective see: pungent Date: 15th century incapable of being subdued or overthrown ; impregnable , stable , fixed , ~ness noun inexpugnably adverb
INEXPUGNABLE
Meaning of INEXPUGNABLE in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012