翻云覆雨 [- yún fù yǔ]as changeable as clouds and rain; blow hot and cold; change attitudes constantly; fickle as human feelings; play fast and loose; repeatedly changing one's attitude or playing tricks：
•¶ 他这个人翻云覆雨， 弄不清他究竟主张什么。 He's a man given to blowing hot and cold; you just can't tell what he's standing for.