egotistical

/ˌiː.ɡoʊˈtɪs.tɪk/

形容词

自大的，自负的，念念不忘自我的
He was so egotistical that he believed he was the smartest person in the room and constantly talked down to others.
他非常自负，认为自己是房间里最聪明的人，经常看不起别人。