bad-tempered or not speaking because you are angry about somethingSarah had looked sulky all morning.a sulky childHe lapsed into a sulky silence.Wordfinderyoungadolescent,immature,mixed up,naive,puberty,rebellious,sulky,tearaway,teenager,youngOxford Collocations DictionarySulky is used with these nouns: child,teenagerSeefull entrySee related entries:Youth,AngerWord Originmid 18th cent.: perhaps from obsolete sulke ‘hard to dispose of’, of unknown origin.
See sulky in the Oxford Advanced American Dictionary