purposeless
adj. 无目的的；无益的；缺乏决心的
例句
Time may also be wasted in purposeless meetings.
时间也可能被浪费在无目的的会议中。
《柯林斯英汉双解大词典》
Since evolution has given rise to few, if any, purposeless physiological responset, it is logical to assume that crying has one or more functions that enhance survival.
既然进化产生了即使有也很少的、无目的的生理反应，我们就可以从逻辑上假设哭泣有一个或多个增强生存能力的功能。
Surely my existence cannot be so purposeless?
想必，我的存在不可能如此毫无意义吧？
