Gerund functioning as a noun meaning the act of causing annoyance or worry.
botheringgerund / present participle Present participle used adjectivally to describe something that causes annoyance.
The bothering noise kept me awake all night.
Надоедливый шум не давал мне уснуть всю ночь.
The bothering thought wouldn't leave her mind.
Беспокоящая мысль не покидала её голову.