中英成語(yǔ)俚語(yǔ)800對(duì)129：反復(fù)無(wú)常

　　反復(fù)無(wú)常

　　Play fast and loose.

　　eg：One should not blow hot and cold with what one has promised.

　　中英俚語(yǔ)俗語(yǔ)來(lái)源：漢書：“齊夸詐多變，反覆之國(guó)。 ”

　　同義詞：變幻莫測(cè) The wind keeps not always at one quarter.

　　反義源：矢至不渝 Stick to it.