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. 轻浮的;见异思迁的;反复无常的 [disapproval]
Isabelle was a frivolous little fool, vain and flighty.