ADJ-GRADED
轻浮的;见异思迁的;反复无常的
If you say that someone is flighty, you disapprove of them because they are not very serious or reliable and keep changing from one activity, idea, or partner to another.
例句
Isabelle was a frivolous little fool, vain and flighty.
伊莎贝尔是个轻佻、没头脑的小女人，非常虚荣又反复无常。