In a sulk
I believe the answer is:
moping
'in a sulk' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for moping that I've seen before include "Being dejected and apathetic" , "brooding" , "Wandering about in low spirits" , "Sulking or mooning about" , "Moving about listlessly" .)