Definition (行為)
To behave as if one believes they are very important or have a very high opinion of oneself.
自視甚高
Ever since his promotion, he has been full of his own importance, always acting like he is a big deal.
自從升職後，他就自以為是，總是一副很了不起的樣子。
That manager is always full of his own importance and doesn't listen to the opinions of other colleagues.
那位經理總是自以為是，不聽其他同事的意見。
She was too full of her own importance to notice the feelings of those around her.
她太自以為是了，以至於沒有注意到周圍人的感受。