Understanding Diction: Frenetic Energy

Analyze the following excerpt from a reflective essay:

'In contemplating my youth, I am struck by the frenetic energy that drove me to explore every nook and cranny of my imagination. This insatiable curiosity fueled my adventures, leading me through vibrant landscapes of possibility, yet often leaving my close relationships in the shadows of my exuberance.'

What word best describes the author's choice of diction in the phrase "frenetic energy"?