definition of
[sullen]

[1] #1 sullen s. [dark, dour, glowering, glum, moody, morose, saturnine, sour] showing a brooding ill humor; "a dark scowl"; "the proverbially dour New England Puritan"; "a glum, hopeless shrug"; "he sat in moody silence"; "a morose and unsociable manner"; "a saturnine, almost misanthropic young genius"- Bruce Bliven; "a sour temper. wn

[2] #2 sullen s. [heavy, lowering, threatening] darkened by clouds; "a heavy sky". wn