frenetics

The frenetic rushed from task to task, never pausing to rest.

用法提示：此处 frenetic 作名词，指‘狂乱的人’，在句中作主语。

Our team has two frenetics who thrive on constant activity.

用法提示：frenetics 是 frenetic 的复数形式，这里指‘狂乱的人’，在句中作宾语。

She called her brother a frenetic because he cannot relax for a minute.

用法提示：frenetic 作名词，与 a 连用，表示‘一个狂乱的人’，在句中作宾语补足语。