Which word denotes someone who is lively and full of energy?

The word "vivacious" is used to describe someone who is lively, energetic, and full of spirit. It evokes a sense of enthusiasm and a spirited personality, often associated with cheerfulness and vigor. People who are vivacious typically have an engaging presence and emanate a dynamic energy that can uplift those around them. This term captures the essence of someone who is not just active, but also delightfully animated and enthusiastic in demeanor.

In contrast, "phlegmatic" describes a person who is calm and composed, showing little emotion, and is generally not associated with liveliness. "Nondescript" refers to someone who lacks distinct or interesting features, making it the opposite of lively. Finally, "magnanimous" pertains to a generous or noble spirit but does not convey the sense of energy or vivacity that characterizes the correct choice.