What is what does zealous mean?

Zealous means having or showing great enthusiasm, passion, fervor, or energy for a cause or belief. A zealous person is highly motivated, dedicated, and passionate in their pursuit of a particular goal or idea. This term is often used to describe someone who is full of energy and spirit in their endeavors or someone who is very passionate about a particular cause or idea, often to the point of being overly enthusiastic or intense.