| ADJECTIVE | all | imperviable, impervious | not admitting of passage / passage or capable of being affected |
|---|
| Meaning | not admitting of passage / passage or capable of being affected. | |
|---|---|---|
| Synonym | impervious | |
| Narrower | acid-fast | not easily decolorized by acid solutions |
| colorfast | Having color / color that is resistant to fading or running | |
| corrosion-resistant | impervious to corrosion | |
| fast | resistant to destruction or fading | |
| greaseproof | resistant to penetration by grease or oil or wax | |
| mothproof, moth-resistant | resistant to damage by moths | |
| proof | (used in combination or as a suffix) able to withstand | |
| resistant | impervious to being affected | |
| rot-resistant | resistant to rotting | |
| runproof, ladder-proof, run-resistant | (of hosiery) resistant to runs or (in Britain) ladders | |
| soundproof | impervious to, or not penetrable by, sound | |
| See also | impermeable | preventing especially liquids / liquids to pass or diffuse through |
| Opposite | pervious | Admitting of passage / passage or entrance |
| Spanish | impermeable, insensible | |
| Catalan | impermeable, insensible | |
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