adjective see: prize Date: 15th century incapable of being taken by assault ; unconquerable , unassailable , impregnability noun ~ness noun impregnably adverb
IMPREGNABLE
Meaning of IMPREGNABLE in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012