sul·len 
(sŭlən)
(sŭlən)adj. sul·len·er, sul·len·est
1. Showing a brooding ill humor or silent resentment; morose or sulky.
2. Gloomy or somber in tone, color, or portent: sullen, gray skies.
3. Sluggish; slow: the sullen current of a canal.
[Middle English solein, from Anglo-Norman solein, alone, from sol, single, from Latin sōlus, by oneself alone; see s(w)e- in the Appendix of Indo-European roots.]
sullen·ly adv.
sullen·ness n.
- front-end loader
- frontenis
- frontes
- frontier
- frontiersman
- frontierswoman
- frontispiece
- frontlet
- frontline
- frontlist
- front-load
- frontman
- front matter
- front money
- front nine
- front office
- frontogenesis
- frontolysis
- fronton
- frontotemporal
- frontotemporal dementia
- front-page
- Front Range
- front room
- front-runner