1.  play fast and loose
2.  be unsteady
3.  blow hot and cold

• 1. 反复无常: caprice | blow hot and cold | inconstancy | as changeable as the moon
• 2. 反复无常的: capricious | volatile | erratic | whimsical
• 3. 反复无常的人: chameleon | vane

更多释义

• 1.他被指责反复无常，不讲民主。
  He was accused of being capricious and undemocratic.
  dict.yoduao.com
• 2.他的最大缺点就是反复无常。
  His worst fault was his inconsistency.
  dict.yoduao.com
• 3.你反复无常，让人捉摸不透。
  You are inconsistent and unpredictable.
  dict.yoduao.com

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