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.