unaffected or unable to be affected by (adjective)
preventative of any penetration; impenetrable, impermeable, particularly of water (adjective)
immune to damage or effect (adjective)
Examples of word impervious
Modest increases in impervious surface due to construction of cottages can in most cases easily be offset by modest removal of impervious surfaces on affected lots, and/or disconnection of downspouts from pipes that discharge runoff to streets.
We, the English, as you can see, are of average height, smoke a pipe, carry a rolled umbrella, go to the best schools, yet remain impervious to knowledge.
With the assistance of such guides, nothing could remain impervious or inaccessible; resistance was fatal; flight was impracticable; and the patient submission of helpless innocence seldom found mercy from the Barbarian conqueror.
Fletcher: "We need to go back and reduce the amount of what we call impervious surface, the amount of pavement and roofs that won't absorb water.
All of nature’s indicators speak of global strain, and yet we the relatively affluent remain impervious to it.