un·im·proved /-ˈpruvd/
 (a.)未加改善的;未墾的
 Un·im·proved a.
 1. Not improved; not made better or wiser; not advanced in knowledge, manners, or excellence.
 2. Not used; not employed; especially, not used or employed for a valuable purpose; as, unimproved opportunities; unimproved blessings.
 3. Not tilled, cultivated, or built upon; yielding no revenue; as, unimproved land or soil.
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 unimproved
      adj 1: not made more desirable or valuable or profitable;
             especially not made ready for use or marketing; "taxes
             on unimproved land are low"; "unimproved dirt roads"
             [ant: improved]
      2: (of land) not cleared of trees and brush; in the wild or
         natural state; "a farm with 50 acres of unimproved and 68
         acres of improved land"; "unimproved woodlands"