desultory

他的演讲内容很散乱，从一个话题跳到另一个话题，毫无关联。

His speech was ___desultory, shifting from one topic to another without any connection.

她散漫的学习方式就是每十分钟在生物笔记和历史单词卡之间来回切换。

Her ___desultory approach to studying meant she switched between biology notes and history flashcards every ten minutes.

那个实习生漫不经心的做事态度——一会儿整理桌子一会儿又闲翻手机——终于惹恼了项目组长。

The intern's ___desultory efforts around the office — rearranging his desk then scrolling idly — finally irritated the project lead.