Open English Wordnet
Adjectives
(a)unimprovednot made more desirable or valuable or profitable; especially not made ready for use or marketing“taxes on unimproved land are low”, “unimproved dirt roads”
(s)unimproved(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”