a person who tries to change or have an influence on things that are not their responsibility

Critics of the war are hypocritical meddlers. 批评这场战争的人都是虚伪的爱管闲事的人。

He is a troublemaker, an unwelcome meddler. 他总给别人制造麻烦，而且爱管闲事，很不受欢迎。