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Jyutping m4 cau3 mai5 hei3
Pinyin wú xiù mǐ qì

Definitions (粵典–words.hk)
  1. 形容詞、俚語
    形容​一個​人​未​見過​世面​,​諗​法​幼稚​或者​年紀輕​閲​歷少
    naive; immature; unfamiliar with the ways of the world
    • 佢都咁大個人啦,點解仲係咁唔嗅米氣㗎?
      佢都咁大个人啦,点解仲系咁唔嗅米气㗎?
      keoi5 dou1 gam3 daai6 go3 jan4 laa1, dim2 gaai2 zung6 hai6 gam3 m4 cau3 mai5 hei3 gaa3?
      How can one be so immature for your age?
  2. 參看
    唔湊米氣

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Jyutping m4 cau3 mai5 hei3
Pinyin n2 xiù mǐ qì

Definitions (CC-CANTO)
  1. not eating enough rice; not being smart in social/ inter-personal aspects
Examples (粵典–words.hk)
  1. Cantonese
    佢都咁大个人啦,点解仲系咁唔嗅米气㗎?
    佢都咁大個人啦,點解仲係咁唔嗅米氣㗎?
    keoi5 dou1 gam3 daai6 go3 jan4 laa1, dim2 gaai2 zung6 hai6 gam3 m4 cau3 mai5 hei3 gaa3?
    • How can one be so immature for your age?