adj. 25B6; adjective SAD, unhappy, doleful, woebegone, dejected, downcast, downhearted, despondent, dispirited, crestfallen, cast down, depressed, down, disappointed, disheartened, discouraged, demoralized, low-spirited, forlorn, in the doldrums, melancholy, miserable, long-faced, glum, gloomy; informal blue, choked, down in the mouth, down in the dumps, fed up; poetic/literary dolorous.
cheerful.