The opposite of "conducts oneself properly" can be "acts inappropriately." This implies a lack of manners, decorum, and social skills. When a person does not conduct oneself properly, they may engage in actions that are disapproved of in polite society, such as speaking rudely, showing disrespect, and causing disruptions. Such behavior can lead to negative consequences, such as lost opportunities, strained relationships, and damage to one's reputation. By contrast, conducting oneself properly involves following social norms, being courteous and respectful, and exhibiting self-control. It is an essential skill for maintaining positive relationships and advancing in one's personal and professional life.