Impenetrable is a synonym for impervious.
responsive
waterproof
Opaque
The rocks formed an impervious surface, and the rainwater flowed off into the town. In comic books, Superman is impervious to knives, bullets, and even bombs. The lawyer's logic was impervious to his opponent's arguments.
im
hard of hearing, stone deaf, oblivious, indifferent, ummoved, unsymphathetic, impervious, unhearing
The lead wall was impervious to radiation. He is impervious to her bad temper.
i am impervious to your insults
The rain poured down, but the impervious roof kept us dry.
She remained impervious to the criticism and continued with her work.
I am impervious from bullets and I destroyed the robbers.
Gold and platinum are impervious to nitric acid.
Due to his trauma, the man was impervious to pain. The concrete floor was impervious to rain. The center for NORAD is buried under Cheyenne Mountain, and designed to be nearly impervious to nuclear attack.
A garden fish-pond needs an impervious lining.
The book is so well researched it's impervious to criticism.
Not pervious; not admitting of entrance or passage through; as, a substance impervious to water or air.
waterproof