反复无常 反覆無常

    fǎnfùwúcháng

    1. Adjectiveunstable; erratic; changeable; fickle

    这人性格反复无常,让人很难相处。Zhè rén xìnggé fǎnfùwúcháng, ràng rén hěn nán xiāngchǔ.This person is erratic, making them hard to deal with.