自以为是
zi yi wei shi
1.to consider oneself in the right; to regard oneself as infallible; to be full of oneself; to have a firm belief in one's own opinions
2.opinionated; self-righteous; bumptious; dogmatic; smug; self-complacent
自恋
一个人其实很笨很白痴,但他自己觉得自己很聪明,很了不起,该用什么词来形容这个人?