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Jyutping mou4 gan1 zi1 muk6 , mou4 jyun4 zi1 seoi2
Pinyin wú gēn zhī mù , wú yuán zhī shuǐ

Definitions (Wiktionary)
  1. phrase, figuratively, idiomatic
    Synonym of 無源之水,無本之木/无源之水,无本之木 (wúyuán zhī shuǐ, wúběn zhī mù, “baseless”).
    (syn.) 無本之木, 无本之木, 無源之水, 无源之水