unimproved
1 of 2adjective (1)
un·im·proved ˌən-im-ˈprüvd 
obsolete
: not reproved or admonished
unimproved
2 of 2adjective (2)
: not improved: such as
a
: not tilled, built on, or otherwise improved for use
unimproved land
b
: not used or employed advantageously
unimproved opportunities
c
: not selectively bred for better quality or productiveness
Word History
First Known Use
Adjective (1)
1602, in the meaning defined above
Adjective (2)
1665, in the meaning defined above