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Jyutping mou4 dyun1 baak6 si6
Pinyin wú duān bái shì

Definitions (CC-CANTO)
  1. (slang) for nothing; for no reason at all; totally uncalled-for
Definitions (粵典–words.hk)
  1. 副詞
    一​啲​嘢​無​理由​、​突然​噉​發生
    for no reason; suddenly; out of the blue
    • 我頭先揩到人哋架車,無端白事唔見咗幾千蚊。
      我头先揩到人哋架车,无端白事唔见咗几千蚊。
      ngo5 tau4 sin1 haai1 dou2 jan4 dei6 gaa3 ce1, mou4 dyun1 baak6 si6 m4 gin3 zo2 gei2 cin1 man1.
      I have just scratched someone's car and lost a couple grand out of the blue.
    • 我老細琴日過大海輸咗錢,今日返工無端白事畀佢鬧咗鑊甘嘅。
      我老细琴日过大海输咗钱,今日返工无端白事畀佢闹咗镬甘嘅。
      ngo5 lou5 sai3 kam4 jat6 gwo3 daai6 hoi2 syu1 zo2 cin2, gam1 jat6 faan1 gung1 mou4 dyun1 baak6 si6 bei2 keoi5 naau6 zo2 wok6 gam1 ge3.
      My boss lost money from gambling in Macau yesterday, and today at work, I got scolded a good deal by him for no reason.
    • 無端白事嚟揾我,係唔係出咗事啊?
      无端白事嚟揾我,系唔系出咗事啊?
      mou4 dyun1 baak6 si6 lai4 wan2 ngo5, hai6 m4 hai6 ceot1 zo2 si6 aa3?
      You're looking for me all of a sudden. Did something happen?
  2. 近義詞
    無啦啦、無情情、無情白事、無端端
Definitions (Wiktionary)
  1. phrase, Cantonese, idiomatic
    without cause or reason
Definitions (Kaifangcidian)
  1. 無緣無故 – 无缘无故
  2. 平白無故 – 平白无故
  3. 沒有來有 – 没有来有
  4. 無端 – 无端
Examples (粵典–words.hk)
  1. Cantonese
    我头先揩到人哋架车,无端白事唔见咗几千蚊。
    我頭先揩到人哋架車,無端白事唔見咗幾千蚊。
    ngo5 tau4 sin1 haai1 dou2 jan4 dei6 gaa3 ce1, mou4 dyun1 baak6 si6 m4 gin3 zo2 gei2 cin1 man1.
    • I have just scratched someone's car and lost a couple grand out of the blue.
  2. Cantonese
    我老细琴日过大海输咗钱,今日返工无端白事畀佢闹咗镬甘嘅。
    我老細琴日過大海輸咗錢,今日返工無端白事畀佢鬧咗鑊甘嘅。
    ngo5 lou5 sai3 kam4 jat6 gwo3 daai6 hoi2 syu1 zo2 cin2, gam1 jat6 faan1 gung1 mou4 dyun1 baak6 si6 bei2 keoi5 naau6 zo2 wok6 gam1 ge3.
    • My boss lost money from gambling in Macau yesterday, and today at work, I got scolded a good deal by him for no reason.
  3. Cantonese
    无端白事嚟揾我,系唔系出咗事啊?
    無端白事嚟揾我,係唔係出咗事啊?
    mou4 dyun1 baak6 si6 lai4 wan2 ngo5, hai6 m4 hai6 ceot1 zo2 si6 aa3?
    • You're looking for me all of a sudden. Did something happen?
  4. Cantonese
    无端白事畀人话㖞,我就唔信你唔会唔忿气喇。
    無端白事畀人話喎,我就唔信你唔會唔忿氣喇。
    mou4 dyun1 baak6 si6 bei2 jan4 waa6 wo3, ngo5 zau6 m4 seon3 nei5 m4 wui5 m4 fan6 hei3.
    • A scold for nothing, I don't think you will take that lightly.