sullen

adj.

[1]

dark , sulky , sulking , dour , glowering , morose , glum , brooding , pouting , moody , morose , gloomy , moody , saturnine , sour , temperamental , dour , lugubrious , funereal , dismal , dreary , grim , depressing , depressed , churlish , ill-humoured , glum , grumpy , sombre , out of humour , antisocial , unsociable , cross , petulant , perverse , crusty , crotchety , choleric , crabby , ill-natured , ill-tempered , bad-tempered , splenetic , peevish , dyspeptic , out of sorts , (US) cranky

[2]

heavy , lowering , threatening