形容词

1. 令人烦恼的;令人头疼的;烦人的
You use troublesome to describe something or someone that causes annoying problems or difficulties.

2. (形势、问题等)麻烦的，困难的，棘手的
A troublesome situation or issue is full of complicated problems or difficulties.

1. difficult to deal with

e.g. a troublesome infection
a troublesome situation