Definition of disgruntled adjective from the Oxford Advanced Learner's Dictionary

 

disgruntled

 adjective
adjective
BrE BrE//dɪsˈɡrʌntld//
 
; NAmE NAmE//dɪsˈɡrʌntld//
 
Disappointment, Anger
 
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annoyed or disappointed because something has happened to upset you disgruntled employees disgruntled at somebody/something I left feeling disgruntled at the way I'd been treated. See related entries: Disappointment, Anger Word Origin mid 17th cent.: from dis- (as an intensifier) + dialect gruntle ‘utter little grunts’, from grunt.Extra examples He’s feeling very disgruntled with his boss. She was rather disgruntled at the way she had been treated. I left feeling disgruntled at the way I’d been treated. Police believe it was probably sabotage by a disgruntled employee. Some ministers were openly disgruntled with her style of leadership.
See the Oxford Advanced American Dictionary entry: disgruntled