Unpleasantly stern or rough (5)
I believe the answer is:
harsh
This clue is a double definition.
'unpleasantly stern' is the first definition.
(I've seen this before)
'rough' is the second definition.
(I know that rough can be written as harsh)
(Other definitions for harsh that I've seen before include "Raucous - austere - bitter" , "Punitive" , "Severe; bleak" , "Unpleasantly stern" , "Abrasive, rough or unkind" .)