朝三暮四
HSK 7-9changeable; inconsistent; (lit.) 'three in the morning, four in the afternoon'
Explanation
indecisive; to blow hot and cold
Examples
他朝三暮四,让人捉摸不透。
He is fickle, hard to figure out.
她朝三暮四,今天答应了的事情明天又反悔。
She is fickle, promising things today and breaking them tomorrow.