I really admire your stamina, your commitment and your eagerness to pursue a career as one of the youngest vice presidents ever in the company, but is it really worth it?

eagerness 是形容词 eager 的名词形式，由 eager（热切的）加上名词后缀 -ness 构成，表示"热切、渴望"的状态。这个词强调积极主动、充满热情的态度。