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Jyutping faan2 fuk1 mou4 soeng4
Pinyin fǎn fù wú cháng

Definitions (CC-CEDICT)
  1. unstable
  2. erratic
  3. changeable
  4. fickle
Definitions (CC-CANTO)
  1. unpredictable; erratic
Definitions (粵典–words.hk)
  1. x
Definitions (Wiktionary)
  1. phrase, idiomatic
    to be capricious; to be erratic; to be fickle
    (syn.) 反起反倒
Examples (粵典–words.hk)
  1. Cantonese
    反复无常
    反覆無常
    • the state of being volatile and unstable
  2. Cantonese
    反复无常
    反覆無常
    faan2 fuk1 mou4 soeng4
    • to fickle