He became so conceited that he never accepted anyone's advice.

conceited 是形容词，由动词 conceit（自负、自大）加上后缀 -ed 构成。conceit 本身来自拉丁语 concepere（构想、想象），引申为"过分高估自己"的意思。conceited 形容一个人自视过高、骄傲自满的状态。