[{"Bold_text": "verb (used without object)", "List Items": ["to express dissatisfaction, pain, uneasiness, censure, resentment, or grief; find fault find fault:He complained constantly about the noise in the corridor.Antonyms: rejoice", "to tell of one's pains, ailments, etc.:to complain of a backache.", "to make a formal accusation:If you think you've been swindled, complain to the police."]}]