反复无常
Play fast and loose.
eg：One should not blow hot and cold with what one has promised.
中英俚语俗语来源：汉书：“齐夸诈多变，反覆之国。 ”
同义词：变幻莫测 The wind keeps not always at one quarter.
反义源：矢至不渝 Stick to it.
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