adjective Etymology: Middle English impenetrabel, from Middle French ~, from Latin impenetrabilis, from in- + penetrabilis penetrable Date: 15th century 1. incapable of being penetrated or pierced, inaccessible to knowledge, reason, or sympathy ; impervious , incapable of being comprehended ; inscrutable , impenetrably adverb
IMPENETRABLE
Meaning of IMPENETRABLE in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012