ADJ-GRADED 故作上流人士姿态的；故充高雅的 If you describe someone as la-di-da, you mean that they have an upper-class way of behaving, which you think seems unnatural and is only done to impress people. 故作上流人士姿态的；故充高雅的 [old-fashioned, disapproval]
I wouldn't trust them in spite of all their la-di-da manners.
尽管他们处处显得很高雅的样子，我还是不相信他们。
SYN affected, mannered, posh [informal, mainly British], pretentious