Unpleasantly rough (5)
I believe the answer is:
harsh
'unpleasantly rough' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for harsh that I've seen before include "Grating; severe" , "Strident" , "Unpleasantly stern" , "Severe - unkind" , "Rough and disagreeable, maybe of voice" .)