sullen

Synonyms: bad-tempered cheerless churlish crabbed crabby cross cynical dismal dour dull fretful frowning gloomy glowering glum gruff grumpy heavy hostile ill-humored inert irritable malevolent malicious malign mean moody morose obstinate ornery out of sorts peevish perverse pessimistic petulant pouting pouty querulous saturnine silent somber sour sourpussed stubborn sulking sulky surly tenebrific tenebrous ugly unsociable uptight

Antonyms: bright cheerful grinning happy