Not fine-grained (6)
I believe the answer is:
coarse
I believe this is a double definition.
'not fine' is the first definition.
('coarse' is the opposite to 'fine')
'grained' is the second definition.
(thesaurus)
(Other definitions for coarse that I've seen before include "lacking in taste" , "Inferior" , "Rough or rude" , "Vulgar; not fine" , "Rough, harsh" .)