Misconduct oneself is a phrase that refers to behaving in an improper or inappropriate manner. There are a variety of synonyms that can be used to express the same idea. These include words like misbehave, act up, be naughty, be bad, be wild, behave badly, play up, and act out. Other options might include terms like act improperly, be disrespectful, play the fool, or be disorderly. Ultimately, the right word choice will depend on the context and desired tone of the sentence. However, no matter which term is utilized, the bottom line is the same: misconduct oneself involves engaging in conduct that is not acceptable or appropriate.