Which of the following terms refers to being overly enthusiastic?

The term "exuberant" is used to describe a state of being filled with or characterized by a lively energy and excitement, often to the point of being overly enthusiastic. This word captures the essence of enthusiasm that is not just present but is abundant and overflowing. When someone is described as exuberant, it implies a joyful and enthusiastic demeanor that can be contagious and uplifting.

The other terms have different meanings that do not align with the concept of being overly enthusiastic. "Extraneous" refers to something that is unnecessary or irrelevant, often used in contexts where a part is not crucial to the whole. "Extant" is used to describe something that still exists or is currently in existence, often in reference to species or artifacts. "Extirpate" means to root out or eliminate completely, typically used in contexts of eradication or removal. Each of these terms conveys a distinct concept that does not relate to enthusiastic behavior.