adj.
Pronunciation: ( ˌ )im- ' p ə r-v ē - ə s
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