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Jyutping mou4 sam1 zi1 sat1
Pinyin wú xīn zhī shī

Definitions (粵典–words.hk)
  1. 名詞
    唔​小心​而​造成​嘅​失​誤​,​唔​係​特登​做​錯​嘅​(​量​詞​:​個​/​次​)
    unintentional or careless mistake
    • 你就原諒佢今次嘅無心之失啦,我諗佢唔會再有下次架喇。
      你就原谅佢今次嘅无心之失啦,我谂佢唔会再有下次架喇。
      nei5 zau6 jyun4 loeng6 keoi5 gam1 ci3 ge3 mou4 sam1 zi1 sat1 laa1, ngo5 nam2 keoi5 m4 wui5 zoi3 jau5 haa6 ci3 gaa3 laa3.
      Please forgive him for his unintentional mistake this time. I think he will not do it in the future.
Definitions (Wiktionary)
  1. phrase, idiomatic
    Synonym of 無心之過/无心之过 (wúxīnzhīguò, “unintentional mistake; careless mistake”).
    (syn.) 无心之过, 無心之過
Examples (粵典–words.hk)
  1. Cantonese
    你就原谅佢今次嘅无心之失啦,我谂佢唔会再有下次架喇。
    你就原諒佢今次嘅無心之失啦,我諗佢唔會再有下次架喇。
    nei5 zau6 jyun4 loeng6 keoi5 gam1 ci3 ge3 mou4 sam1 zi1 sat1 laa1, ngo5 nam2 keoi5 m4 wui5 zoi3 jau5 haa6 ci3 gaa3 laa3.
    • Please forgive him for his unintentional mistake this time. I think he will not do it in the future.