Etymology
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impervious (adj.)

1640s, from Latin impervius "not to be traverse, that cannot be passed through, impassible," from assimilated form of in- "not, opposite of" (see in- (1)) + pervius "letting things through, that can be passed through," from per "through" (from PIE root *per- (1) "forward," hence "through") + via "road" (see via (adv.)). Related: Imperviously; imperviousness.

updated on May 16, 2017

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Definitions of impervious from WordNet

impervious (adj.)
not admitting of passage or capable of being affected;
someone impervious to argument
a material impervious to water
Synonyms: imperviable
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.