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countable and uncountable, plural disgruntlements
The state of being disgruntled, usually displayed in a stereotypical form such as frowning and annoyance; the acts of sulky dissatisfaction. quotations examples
The third most common motive for Americans to commit espionage is disgruntlement, usually caused by the person's relationships or treatment in the workplace, and the associated desire to take revenge.
2008, Katherine L. Herbig, Changes in Espionage by Americans: 1947-2007, page 35