Definition of impervious

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< imperturbable

impetigo >

im·per·vi·ous    (m-pûrv-s) KEY  

ADJECTIVE:

1. Incapable of being penetrated: a material impervious to water.
2. Incapable of being affected: impervious to fear.

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ETYMOLOGY:
From Latin impervius : in-, not ; see in- ¹ + pervius, pervious ; see pervious

OTHER FORMS:
im·pervi·ous·ly (Adverb), im·pervi·ous·ness (Noun)

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