/ ˈsʌlki; NAmE / adjective
( disapproving ) bad-tempered or not speaking because you are angry about sth :
Sarah had looked sulky all morning.
a sulky child
► sulk·ily / -ɪli; NAmE / adverb
► sulki·ness noun [ U ]
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WORD ORIGIN
mid 18th cent.: perhaps from obsolete sulke hard to dispose of , of unknown origin.