imperviable vs impervious

imperviable and impervious both are adjectives.

Word	Noun	Adjective	Verb	Adverb
imperviable	No	Yes	No	No
impervious	No	Yes	No	No

As adjectives, imperviable and impervious are synonyms defined as:

imperviable and impervious: not admitting of passage or capable of being affected

imperviable (adjective)	impervious (adjective)
not admitting of passage or capable of being affected	not admitting of passage or capable of being affected