impervious, imperviable (adj)

not admitting of passage or capable of being affected

"a material impervious to water"; "someone impervious to argument"

impervious (Adjective)

unaffected or unable to be affected by

impervious (Adjective)

preventative of any penetration; impenetrable, impermeable, particularly of water

impervious (Adjective)

immune to damage or effect

impervious

Permeability in fluid mechanics and the Earth sciences (commonly symbolized as k) is a measure of the ability of a porous material (often, a rock or an unconsolidated material) to allow fluids to pass through it.