Antonyms of noun imperviousness

1 sense of imperviousness

Sense 1
impenetrability, imperviousness -- (the quality of being impenetrable (by people or light or missiles etc.))
       Antonym of perviousness (Sense 1)
      => penetrability, perviousness -- (the quality of being penetrable (by people or light or missiles etc.))

Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun imperviousness

1 sense of imperviousness

Sense 1
impenetrability, imperviousness -- (the quality of being impenetrable (by people or light or missiles etc.))
       => quality -- (an essential and distinguishing attribute of something or someone; "the quality of mercy is not strained"--Shakespeare)