Disgusted (3,2)
'disgusted' is the definition.
(synonyms)
This is all the clue.
(Other definitions for fed up that I've seen before include "Bored - disgusted" , "Sick of eating" , "Bored and angry" , "'Bored with eating? (3,2)'" , "Depressed" .)
'disgusted' is the definition.
(sickening is a kind of disgusting)
This is all the clue.
(Other definitions for sickened that I've seen before include "Nauseated" , "Disgusted" , "were revolting" , "Made ill" .)