Depressing
gloomy, dreary, melancholy, dark, cheerless, bleak, desolate, doleful, dispiriting, dolorous, sad, sorrowful, inauspicious, morbid, troubling, horrid, shadowy, tenebrous, dim, overcast, cloudy, gray, unhappy, discouraging, hopeless, black, grim, unfortunate, dreadful, ghastly, horrible, monotonous, tedious, boring, frowning, lowering, mournful, dull, disheartening, afflictive, unwholesome, regrettable, dusky, dingy, sepulchral, joyless, forlorn, funereal, comfortless, murky, wan, somber, woebegone, disagreeable, blue*; see also dark 1, sad 2.
Antonyms joyful, cheerful, bright.