the GNU version of the Collaborative International Dictionary of English
adj. Not improved; not made better or wiser; not advanced in knowledge, manners, or excellence.
adj. Not used; not employed; especially, not used or employed for a valuable purpose.
adj. Not tilled, cultivated, or built upon; yielding no revenue.
The Century Dictionary and Cyclopedia
Not improved, in any sense; specifically, of land, not tilled; not cultivated; not brought into a condition for use by expenditure of labor.
Not tested; not proved.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
adj. (of land) not cleared of trees and brush; in the wild or natural state
adj. not made more desirable or valuable or profitable; especially not made ready for use or marketing
Word Usage
"The other third of the improved land and a considerable portion of that half of the farm area known as unimproved land are utilized as pasture for domestic animals."