Noah Webster
Unimproved
UNIMPROVED, adjective
1. Not improved; not made better or wiser; not advanced in knowledge, manners or excellence.
2. Not used for a valuable purpose. How many advantages unimproved have we to regret!
3. Not used; not employed.
4. Not tilled; not cultivated; as unimproved land or soil; unimproved lots of ground.
5. Uncensured; not disapproved. [This sense, from the Latin improbo, is entirely obsolete.]