Main Entry: im·per·vi·ous

Pronunciation: \(ˌ)im-ˈpər-vē-əs\

Function: adjective

Etymology: Latin impervius, from in- + pervius pervious

Date: 1640

1 a : not allowing entrance or passage : impenetrable <a coat impervious to rain> b : not capable of being damaged or harmed <a carpet impervious to rough treatment>
2 : not capable of being affected or disturbed <impervious to criticism>

— im·per·vi·ous·ly adverb

— im·per·vi·ous·ness noun