adjective Etymology: Latin impervius, from in- + pervius pervious Date: 1640 1. not allowing entrance or passage ; impenetrable , not capable of being damaged or harmed , not capable of being affected or disturbed , ~ly adverb ~ness noun
IMPERVIOUS
Meaning of IMPERVIOUS in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012