Harassment or pestering—acts or behavior intended to annoy, upset, or trouble someone, often repeated (can occur at work, school, online, etc.).
彼は職場で上司から嫌がらせを受けていると訴えた。
He complained that he was being harassed by his boss at work.
学校での嫌がらせは深刻な問題だ。
Bullying/harassment at school is a serious problem.
彼女は匿名のメールによる嫌がらせに困っている。
She is troubled by harassment via anonymous emails.
やめてください。そんな嫌がらせは本当にやめてほしい。
Please stop. I really want you to stop that kind of harassment.