baleful, dire, direful, doomy, foreboding, ill, ill-boding, inauspicious, menacing, ominous, portentous, sinister, threatening

black, bleak, cheerless, chill, Cimmerian, cloudy, cold, comfortless, dark, darkening, depressing, depressive, desolate, dim, 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, somber(or sombre), sullen, sunless, tenebrific, tenebrous, wretcheddiscouraging, disheartening, hopeless, unfavorable, unpromising, unpropitiousill-fated, ill-starred, star-crossed, troubled, unfortunate, unluckyevil, malign, malignant