Definition of impervious
1a
: 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
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Merriam-Webster unabridged
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Time Traveler for impervious
The first known use of impervious was in 1615
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