adj.
Pronunciation: ( ˌ )im- ' p ə r-m ē - ə -b ə l
Function: adjective
Etymology: Late Latin impermeabilis, from Latin in- + Late Latin permeabilis permeable
Date: 1697
: not permitting passage (as of a fluid) through its substance broadly : IMPERVIOUS
– im · per · me · abil · i · ty \ - ˌ p ə r-m ē - ə - ' bi-l ə -t ē \ noun