ominous

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

black, bleak, cheerless, chill, Cimmerian, cloudy, cold, comfortless, dark, darkening, depressing, depressive, desolate, dim, disconsolate, dismal, drear, dreary, dreich [], elegiac ( elegiacal), forlorn, funereal, gloomy, glum, godforsaken, gray ( grey), lonely, lonesome, lugubrious, miserable, morbid, morose, murky, plutonian, saturnine, sepulchral, somber ( sombre), sullen, sunless, tenebrific, tenebrous, wretched; discouraging, disheartening, hopeless, unfavorable, unpromising, unpropitious; ill-fated, ill-starred, star-crossed, troubled, unfortunate, unlucky; evil, malign, malignant

auspicious, benign, bright, encouraging, favorable, golden, heartening, hopeful, promising, propitious, prosperous