More unpleasant (7)
I believe the answer is:
nastier
'more unpleasant' is the definition.
('nasty' can be similar in meaning to 'unpleasant')
This is the entire clue.
(Other definitions for nastier that I've seen before include "Less nice" , "More disgusting" , "Getting even worse" , "More unpleasant or distasteful" , "becomes more unpleasant" .)