sulk ‧ y /ˈsʌlki/ BrE AmE adjective
[ Date: 1700-1800 ; Origin: Probably from sulke 'slow-moving' (1600-1700) ]
sulking, or tending to sulk ⇨ moody :
a sulky child
He put on a sulky expression.
Katherine sat in a sulky silence.
—sulkily adverb
—sulkiness noun [uncountable]