Incomplete, imperfect (10)
I believe the answer is:
unfinished
I believe this is a double definition.
'incomplete' is the first definition.
(thesaurus)
'imperfect' is the second definition.
(thesaurus)
(Other definitions for unfinished that I've seen before include "rough" , "3 18 ... in B minor" , "Not concluded" , "Schubert's Eighth, for example" .)