Definitions
1.AdjectiveHaving a brooding ill temper; sulky.
2.AdjectiveGloomy; dismal; foreboding."a sullen atmosphere"
3.AdjectiveSluggish; slow.
4.AdjectiveMischievous; malignant; unpropitious.
5.AdjectiveObstinate; intractable.
6.NounOne who is solitary, or lives alone; a hermit.
7.NounSullen feelings or manners; sulks; moroseness.
8.VerbTo make sullen.