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Jyutping m4 tong1 m4 seoi2
Pinyin wú tāng wú shuǐ

Definitions (粵典–words.hk)
  1. 形容詞
    介乎​兩者​之間​,​兩邊​都​唔​係​,​狀態​唔​明確
    in a embarrassing state; in a dilemma; neither fish nor fowl; literally: neither (as thick as) soup nor (as watery as) water
    • 你份報告做到唔湯唔水,你真係不知所謂!
      你份报告做到唔汤唔水,你真系不知所谓!
      nei5 fan6 bou3 gou3 zou6 dou3 m4 tong1 m4 seoi2, nei5 zan1 hai6 bat1 zi1 so2 wai6!
      Your report is neither fish nor fowl. You step out of line!
  2. 近義詞
    半唥鯁、唔上唔落
Definitions (Wiktionary)
  1. phrase, Cantonese, idiomatic
    neither fish nor fowl
    (syn.) 不伦不类, 不倫不類

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Jyutping m4 tong1 m4 seoi2
Pinyin n2 tāng n2 shuǐ

Definitions (CC-CANTO)
  1. getting stuck in the middle of nowhere in the event / matter / life; literally 'neither soup nor water'; to describe a relationship that is dubious
Examples (粵典–words.hk)
  1. Cantonese
    你份报告做到唔汤唔水,你真系不知所谓!
    你份報告做到唔湯唔水,你真係不知所謂!
    nei5 fan6 bou3 gou3 zou6 dou3 m4 tong1 m4 seoi2, nei5 zan1 hai6 bat1 zi1 so2 wai6!
    • Your report is neither fish nor fowl. You step out of line!