Isabelle was a frivolous little fool.伊莎贝尔是个举止轻浮的小傻瓜。

a business as fickle and frivolous as fashion像时尚那样难以捉摸、肤浅轻薄的行业

I just decided I was a bit too frivolous to be a doctor.我就是觉得自己有点过于轻浮, 当不了医生。

The group says it wants politicians to stop wasting public money on what it believes are frivolous projects.这一团体称希望政客们不要把公众的钱浪费在在其看来毫无意义的项目上。