Synonyms: imperviable, impervious
Definition: not admitting of passage or capable of being affected
Usage: a material impervious to water; someone impervious to argument
Similar words: fast
Definition: resistant to destruction or fading
Usage: fast colors
Similar words: acid-fast
Definition: not easily decolorized by acid solutions; pertains to micro-organisms (especially the tubercle bacillus that causes tuberculosis)
Similar words: colorfast
Definition: having color that is resistant to fading or running
Similar words: greaseproof
Definition: resistant to penetration by grease or oil or wax
Usage: greaseproof wrapping paper
Similar words: moth-resistant, mothproof
Definition: resistant to damage by moths
Similar words: proof
Definition: (used in combination or as a suffix) able to withstand
Usage: temptation-proof; childproof locks
Similar words: resistant
Definition: impervious to being affected
Usage: resistant to the effects of heat; resistant to persuasion
Similar words: corrosion-resistant
Definition: impervious to corrosion
Usage: he was a great believer in the corrosion-resistant qualities of cast iron
Similar words: rot-resistant
Definition: resistant to rotting
Similar words: run-resistant, runproof, ladder-proof
Definition: (of hosiery) resistant to runs or (in Britain) ladders
Similar words: soundproof
Definition: impervious to, or not penetrable by, sound
Usage: a soundproof room