self-importance
noun [ U ] disapproving uk/ˌself.ɪmˈpɔː.təns/ us/ˌself.ɪmˈpɔːr.təns/
自大；自负
the belief that you are more important or have a higher value than other people
He's a modest, mild-mannered man, without a trace of self-importance. 他是个谦虚而温和的人，没有丝毫的自大。