Overexuberant is a word that is commonly used to describe someone who is overly enthusiastic or excited about something. However, there are several synonyms for this word, each with their own unique connotations. Some possible synonyms include hyperactive, boisterous, exuberant, frenzied, impulsive, and unrestrained. Hyperactive describes someone who is overly active or restless, while boisterous suggests a noisy and unrestrained enthusiasm. Exuberant, on the other hand, is a more positive synonym that can suggest a joyful and optimistic attitude. Frenzied and impulsive both describe an excitable and impetuous behavior, while unrestrained suggests a lack of self-control.