adjective

looking or feeling dejected; morose.

the princess looked glum but later cheered up

gloomy,downcast,downhearted,dejected,disconsolate,dispirited,despondent,crestfallen,cast down,depressed,disappointed,disheartened,discouraged,demoralized,desolate,heavy-hearted,in low spirits,low-spirited,sad,unhappy,doleful,melancholy,miserable,woebegone,mournful,forlorn,long-faced,fed up,in the doldrums,wretched,lugubrious,morose,sepulchral,saturnine,dour,mirthless,blue,down,down in the mouth,down in the dumps,brassed off,cheesed off,dolorous,chap-fallen,adust