impervious
1. [ adjective ] not admitting of passage or capable of being affected
Synonyms: imperviable
Examples:

"a material impervious to water" "steel impervious to bullets" "someone impervious to argument"

Related terms: pervious soundproof mothproof proof fast resistant runproof fast acid-fast greaseproof impermeable
Similar spelling:   imperious
  imperiously
  imperiousness
  imperviable
  Imperato
  improper
  impersonal
  imperative