Sullen
WordNet
adjective
(1) Darkened by clouds
"A heavy sky"
(2) 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"
"A sullen crowd"