Undiscovered
Part of speech: adjective
Definition: That has not been discovered; unknown. That has not yet been discovered; unexplored.
Example sentence: Most writers live in self-imposed exile, even when they don't leave their country. They prefer the undiscovered country inside their own heads.
Unexplored
Part of speech: adjective
Definition: which has not been explored
Example sentence: My feeling is that science is virtually an unexplored ground. It's very visible - more so all the time - but there's no fiction that tells us how scientists think, and they really don't think the way that other people do.