An impervious surface is one that can't be penetrated. The word is often followed by "to," as in "His steely personality made him impervious to jokes about his awful haircut."
Not pervious; not admitting of entrance or passage through;
Adjective
not admitting of passage or capable of being affected; "a material impervious to water"; "someone impervious to argument"
a.
Not pervious; not admitting of entrance or passage
through; as, a substance impervious to water or air.
Impervious
This gulf impassable, impervious.
The minds of these zealots were absolutely impervious.
Not pervious; not admitting of entrance or passage through;
Usage Examples
It is, of course, further indication that a fundamentalist right has really taken over much of the Republican Party, People might cite George Bush as proof that you can be totally impervious to the effects of Harvard and Yale education.
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Other Usage ExamplesFear comes from uncertainty. When we are absolutely certain, whether of our worth or worthlessness, we are almost impervious to fear.
Discipline strengthens the mind so that it becomes impervious to the corroding influence of fear.