From The Collaborative International Dictionary of English v.0.48:

Unimproved \Un`im*proved"\, a.
   1. Not improved; not made better or wiser; not advanced in
      knowledge, manners, or excellence.
      [1913 Webster]

   2. Not used; not employed; especially, not used or employed
      for a valuable purpose; as, unimproved opportunities;
      unimproved blessings. --Cowper.
      [1913 Webster]

   3. Not tilled, cultivated, or built upon; yielding no
      revenue; as, unimproved land or soil.
      [1913 Webster]
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