Simple past tense and past participle of disgruntle.(verb)
Unhappy; dissatisfied(adjective)
Frustrated.(adjective)
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Use "disgruntled" in a sentence
"But until then Briggs privately has vowed to play as hard as ever, but without an extension, he will define the term disgruntled employee."
"The company has said it filed a defamation complaint in Macau against Mr. Jacobs, who it calls a "disgruntled former executive" in Nevada court filings."
"After the robbery and rape at the Table on Aug. 3, the restaurant manager told St. Petersburg police that he suspected Martinez, whom he described as a disgruntled former employee."