1) Dejected 2) Displaying listlessness 3) Exhibiting listlessness 4) Feeling blue 5) Gloomily sulky 6) Glum 7) In a sulk 8) Lethargic 9) Listless 10) Not a happy camper 11) Not exactly a happy camper 12) Prone to sulking Found on https://www.crosswordclues.com/clue/mopey