troublesome

他多年来一直受到膝盖旧伤的困扰。

He has been dealing with a ___troublesome knee injury for years.

他们麻烦的少年儿子一直考试不及格。

Their ___troublesome teenage son consistently failed his classes.

气候变化这一棘手问题需要长期解决方案。

The ___troublesome issue of climate change requires long-term solutions.