Minus; not so much (4)
I believe the answer is:
less
I believe this is a double definition.
'minus' is the first definition.
(I've seen this before)
'not so much' is the second definition.
(I've seen this before)
(Other definitions for less that I've seen before include "inferior" , "Wanting" , "Comparatively little" , "Fewer in number" , "A smaller amount" .)