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unimproved (adj.)
[unimproved 词源字典]
1660s, "not made better," from
un-
(1) "not" + past participle of
improve
(v.). Sense of "not developed or taken advantage of" (of land) is recorded from 1781.
[unimproved etymology, unimproved origin, 英语词源]
[unimproved 词源字典]