中英成語俚語800對129：反復(fù)無常

　　反復(fù)無常

　　Play fast and loose.

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

　　中英俚語俗語來源：漢書：“齊夸詐多變，反覆之國。 ”

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

　　反義源：矢至不渝 Stick to it.