Longman Dictionary of Contemporary English homepage

Date: 1600-1700
Language: Latin
Origin: impervius, from pervius 'allowing things to pass through', from per 'through' + via 'way'

impervious

 adjective
     
Related topics: Geology
im‧per‧vi‧ous [not before noun]
1 formal not affected or influenced by something and seeming not to notice it
impervious to
His ego was impervious to self-doubt.
2 technical not allowing anything to enter or pass through:
impervious volcanic rock
impervious to
materials that are impervious to water
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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