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Jyutping m4 zi1 gei2
Pinyin wú zhī jǐ

Definitions (粵典–words.hk)
  1. 副詞
    非常​、​好​,​到​一個​超出​對方設​想​嘅​地步​,​暗示​對方​或​其他人​唔​了解​程度​之高
    very; beyond imagination; to imply that the hearer or the others does not realize how high the level is
    • 佢咩唔中意iPad呀,佢今年生日收到都唔知幾開心。
      佢咩唔中意iPad呀,佢今年生日收到都唔知几开心。
      keoi5 me1 m4 zung1 ji3 aai1 paat1 aa3, keoi5 gam1 nin2 saang1 jat6 sau1 dou2 dou1 m4 zi1 gei2 hoi1 sam1.
      He doesn't like iPad? You have no idea how happy he was when he got it on his birthday this year.
  2. 近義詞
    不知幾

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Jyutping m4 zi1 gei2
Pinyin n2 zhī jǐ

Definitions (CC-CANTO)
  1. don't know why it is so…
Examples (粵典–words.hk)
  1. Cantonese
    屋企人个个都各散东西,唔知几时先可以一家团聚。
    屋企人個個都各散東西,唔知幾時先可以一家團聚。
    uk1 kei2 jan4 go3 go3 dou1 gok3 saan3 dung1 sai1, m4 zi1 gei2 si4 sin1 ho2 ji5 jat1 gaa1 tyun4 zeoi6
    • My family members are scattered over the globe. I wonder when we will be reunited together again.
  2. Cantonese
    甲:「佢电话几多?」乙:「六五四三,跟住唔知几多㖞。」
    甲:「佢電話幾多?」乙:「六五四三,跟住唔知幾多喎。」
    keoi5 din6 waa2 gei2 do1? luk6 ng5 sei3 saam1, gan1 zyu6 m4 zi1 gei2 do1 wo3.
    • A: "What is his / her phone number?" (How is the order of his / her phone number?) B: "6543 - I've forgotten the rest."
  3. Cantonese
    落雨唔打得波,唔知几冇瘾。
    落雨唔打得波,唔知幾冇癮。
    lok6 jyu5 m4 daa2 dak1 bo1, m4 zi1 gei2 mou5 jan5.
    • The ball game was rained out. What a bummer.
  4. Cantonese
    大家做到冇了赖,唔知几时完工。
    大家做到冇了賴,唔知幾時完工。
    • Our jobs seem endless, and we do not know the time of knocking off.
  5. Cantonese
    佢只抽输咗俾个𡃁仔,都唔知几失威。
    佢隻抽輸咗俾個𡃁仔,都唔知幾失威。
    keoi5 zek3 cau1 syu1 zo2 bei2 go3 leng1 zai2, dou1 m4 zi1 gei2 sat1 wai1.
    • He lost a duel against a kid, how embarrassing.