/ dɪsˈgrʌntld; NAmE / adjective
disgruntled (at sb/sth) annoyed or disappointed because sth has happened to upset you :
I left feeling disgruntled at the way I'd been treated.
disgruntled employees
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WORD ORIGIN
mid 17th cent.: from dis- (as an intensifier) + dialect gruntle utter little grunts , from grunt .