high-and-mighty 傲慢的（非正式）

英文释义
Overly proud of oneself; feeling more important than other people.

例句
Since she won the prestigious prize last month my sister has been acting very high-and-mighty and never returns anyone's phone calls or talks with her old friends.

自从上月获得了这个著名奖项之后，我妹妹开始变得十分傲慢，从来不回别人的电话，也不和老友交谈。