A mannered style of speech or behaviour is artificial, or intended to achieve a particular effect.

His performance as Hamlet was criticized for being very mannered. 他扮演的哈姆雷特被批表演过于做作。

used to describe a person with the behaviour or character of the stated type

a bad-mannered boy 不懂礼貌的男孩

He was a mild-mannered (= gentle and calm) young man. 他是个温文尔雅的小伙子。

I noticed how well-mannered her children were. 我注意到她的小孩多么有礼貌。