Definition of sullens:
(adj) :
Having a brooding ill temper; sulky.
(adj) :
Gloomy; dismal; foreboding.
(n) :
(in the plural) Sullen feelings or manners; sulks; moroseness.
(adj) :
Sluggish; slow.
(adj) :
(obsolete) Mischievous; malignant; unpropitious.
(adj) :
(obsolete) Obstinate; intractable.