godan verb (-su), transitive verb
Transitive verb meaning to cause someone trouble or inconvenience. Often used when the subject's actions or requests impose on another person. The causative form 煩わせる is also common.
See also: 煩わせる
お手数を煩わせて申し訳ありません。
I'm sorry to trouble you (for your time/effort).
He always bothers people with trivial matters.