Antonyms of adj impervious

1 sense of impervious

Sense 1
impervious (vs. pervious), imperviable -- (not admitting of passage or capable of being affected; "a material impervious to water"; "someone impervious to argument")

pervious (vs. impervious) -- (admitting of passage or entrance; "pervious soil"; "a metal pervious to heat")
        => receptive -- (open to arguments, ideas, or change; "receptive to reason and the logic of facts")

Similarity of adj impervious

1 sense of impervious

Sense 1
impervious (vs. pervious), imperviable -- (not admitting of passage or capable of being affected; "a material impervious to water"; "someone impervious to argument")
       => fast -- (resistant to destruction or fading; "fast colors")
       => acid-fast -- (not easily decolorized by acid solutions; pertains to micro-organisms (especially the tubercle bacillus that causes tuberculosis))
       => colorfast -- (having color that is resistant to fading or running)
       => greaseproof -- (resistant to penetration by grease or oil or wax; "greaseproof wrapping paper")
       => mothproof, moth-resistant -- (resistant to damage by moths)
       => proof (predicate) -- ((used in combination or as a suffix) able to withstand; "temptation-proof"; "childproof locks")
       => resistant -- (impervious to being affected; "resistant to the effects of heat"; "resistant to persuasion")
       => corrosion-resistant -- (impervious to corrosion; "he was a great believer in the corrosion-resistant qualities of cast iron")
       => 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; "a soundproof room")
          Also See-> impermeable#1