impervious
im-per-vi-ous
adjective
Not allowing liquid, gas, or light to pass through.
"The material was impervious to water."
adjective
Unable to be affected or influenced by something.
"She seemed impervious to his pleas."
Thesaurus
Synonyms: greaseproof, runproof, acid-fast, ladder-proof, colorfast, rot-resistant, run-resistant, imperviable, soundproof, fast, proof, corrosion-resistant
Antonyms: pervious