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Jyutping mou4 mong5 zi1 zoi1
Pinyin wú wàng zhī zāi

Definitions (粵典–words.hk)
  1. 名詞
    一​啲​意外​嘅​不幸​事件
    unexpected misfortune
    • 佢行行吓街畀個跳樓自殺嘅人跌落嚟撞到重傷,真係場無妄之災呀!
      佢行行吓街畀个跳楼自杀嘅人跌落嚟撞到重伤,真系场无妄之灾呀!
      When he was walking on the street, he got hit from above by a suicidal guy throwing himself off the building. What an unexpected misfortune!
  2. 近義詞
    飛來橫禍
Definitions (Wiktionary)
  1. phrase, idiomatic
    unexpected calamity; undeserved ill turn
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)
Examples (粵典–words.hk)
  1. Cantonese
    无妄之灾
    無妄之災
    • unexpected misfortune
  2. Cantonese
    佢行行吓街畀个跳楼自杀嘅人跌落嚟撞到重伤,真系场无妄之灾呀!
    佢行行吓街畀個跳樓自殺嘅人跌落嚟撞到重傷,真係場無妄之災呀!
    • When he was walking on the street, he got hit from above by a suicidal guy throwing himself off the building. What an unexpected misfortune!