noun
(countable) Something which causes grief.
(countable) A wrong or hardship suffered, which is the grounds of a complaint.
(uncountable) Feelings of being wronged; outrage; resentment, bitterness or anger.
(countable) A complaint or annoyance.
(countable, human resources) A formal complaint, especially in the context of a unionized workplace.
(uncountable) Violation of regulations or objectionable behavior.