The Collaborative International Dictionary
Imperviable
Imperviable \Im*per"vi*a*ble\, a. Not pervious; impervious. [R.] -- Im*per"vi*a*ble*ness, n.
Wiktionary
imperviable
a. impervious
WordNet
imperviable
adj. not admitting of passage or capable of being affected; "a material impervious to water"; "someone impervious to argument" [syn: impervious] [ant: pervious]