madcap

black, bleak, cheerless, chill, Cimmerian, cloudy, comfortless, dark, darkening, depressing, depressive, desolate, dire, disconsolate, dismal, drear, dreary, dreich [chiefly Scottish], elegiac (also elegiacal), forlorn, funereal, gloomy, glum, godforsaken, gray (also grey), lonely, lonesome, lugubrious, miserable, morbid, morose, murky, plutonian, saturnine, sepulchral, solemn, somber (or sombre), sullen, sunless, tenebrific, tenebrous, wretched

blue, dejected, depressed, despondent, down, droopy, hangdog, inconsolable, low, melancholic, melancholy, mirthless, sad, unhappy, woebegone, woeful

dim, discomfiting, discouraging, disheartening, dismaying, dispiriting, distressful, distressing, upsetting

desperate, hopeless, pessimistic

lamentable, mournful, plaintive, sorrowful

colorless, drab, dull

dour, grim, lowering (also louring), lowery (also loury), menacing, negative, oppressive, threatening

blithe, blithesome, buoyant, gay, jocund, jolly, joyful, joyous, merry, mirthful

encouraging, hopeful, optimistic

lighthearted, lightsome

bright, cheerful, cheering, cheery, comforting, cordial, festive, friendly, gay, heartwarming, sunshiny