Very; horribly (7)
I believe the answer is:
awfully
This clue is a double definition.
'very' is the first definition.
(I've seen this in another clue)
'horribly' is the second definition.
(synonyms)
(Other definitions for awfully that I've seen before include "Jolly" , "Frightfully" , "very badly" , "A lot" , "Terribly" .)