Childish behavior is a term often used to describe actions and attitudes that are immature and lacking in emotional maturity. There are several synonyms that can be used to describe this type of behavior, including immature, petulant, puerile, adolescent, juvenile, and infantile. Other words that can be used to describe this behavior include petulant, capricious, bratty, obstinate, and immature. Whether used in a professional setting or to describe personal relationships, it is important to use appropriate language when discussing this type of behavior. Using synonyms can help create a more nuanced and thoughtful understanding of the behavior, and can help individuals address it in a productive and respectful way.