un improved

unimproved

[uhn-im-proovd]
adjective
1.
not developed to full potential, as resources or the mind.
2.
not showing improvement, as one's health, appearance, etc.
3.
(of land) not fitted for a profitable use, as by clearing, cultivation, addition of facilities for dwelling or business purposes, or the like.
4.
not used to advantage; neglected: an unimproved opportunity.
5.
(of animal or plant species) not made more useful or attractive by selective breeding or cultivation.
6.
not enhanced; not increased: Our chance of success is unimproved.

Origin:
1655–65; un-1 + improved

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
unimproved (ˌʌnɪmˈpruːvd)
 
adj
1.  not improved or made better
2.  (of land) not cleared, drained, cultivated, etc
3.  neglected; unused: unimproved resources

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

unimproved
1665, "not made better," from un- (1) "not" + pp. of improve. Sense of "not developed or taken advantage of" is recorded from 1781.
Online Etymology Dictionary, © 2010 Douglas Harper
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