1. not admitting of passage or capable of being affected

- a material impervious to water

- someone impervious to argument

Similar word(s): impermeable, fast, colorfast, greaseproof, mothproof, proof, resistant, runproof, soundproof, imperviable

Sentences with impervious as an adjective:

- The man was completely impervious to the deception we were trying.

- Although patchworked and sagging, the roof proved impervious to the weather.

- The old car seemed to be impervious to the wear and tear of age.