What does "sullen" mean?

Additional senses

1. 2.Mischievous; malignant; unpropitious. Such sullen planets at my birth did shine. Dryden.
2. 3.Gloomily angry and silent; cross; sour; affected with ill humor; morose. And sullen I forsook the imperfect feast. Prior.
3. 4.Obstinate; intractable. Things are as sullen as we are. Tillotson.
4. 5.Heavy; dull; sluggish. "The larger stream was placid, and even sullen, in its course." Sir W. Scott. -- Sullen, Sulky. Both sullen and sulky show themselves in the demeanor. Sullenness seems to be an habitual sulkiness, and sulkiness a temporary sullenness. The former may be an innate disposition; the latter, a disposition occasioned by recent injury. Thus we are in a sullen mood, and in a sulky fit. No cheerful breeze this sullen region knows; The dreaded east is all the wind that blows. Pope. -- Sul"len*ly, adv. -- Sul"len*ness, n.
5. 6.One who is solitary, or lives alone; a hermit. [Obs.] Piers Plowman.
6. 7.pl. Sullen feelings or manners; sulks; moroseness; as, to have the sullens. [Obs.] Shak.
7. 8.To make sullen or sluggish. [Obs.] Sullens the whole body with . . . laziness. Feltham.