flighty

adj.

（尤指女人或其行为）轻浮的，朝三暮四的，反复无常的；

1. He said I was too flighty to be a good supervisor.
   他说我太轻浮不能成为一名好的管理员。
2. She is too flighty to take care of young children.
   她太不负责任, 不能照顾小孩。

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