impervious

Incapable of being penetrated.

Incapable of being affected.

Not pervious; not to be passed through or penetrated; impermeable; impenetrable: as, a substance impervious to moisture.

Synonyms Impenetrable, impassable, pathless.

Not pervious; not admitting of entrance or passage through.

unaffected or unable to be affected by

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

immune to damage or effect

not admitting of passage or capable of being affected