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Jyutping mou4 san4 san4
Pinyin wú shén shén

Definitions (CC-CANTO)
  1. (adjective) silly; unprovoked; surprise with no reason
Definitions (粵典–words.hk)
  1. 副詞
    冇​先兆​噉​;​忽然​之間
    used to describe something that happens without any trace; all of a sudden
    • 佢唔知做咩,無神神喺度大叫。
      佢唔知做咩,无神神喺度大叫。
      I don't know what's wrong with him. He screamed out loud all of a sudden.
    • 隻手指入面啲資料無神神唔見晒。
      只手指入面啲资料无神神唔见晒。
      All data on the USB stick disappeared without any trace.
Examples (粵典–words.hk)
  1. Cantonese
    无神神揾我嚟发泄,你无嘢下话?你青山出嚟㗎?
    無神神揾我嚟發泄,你無嘢下話?你青山出嚟㗎?
    mou4 san4 san4 wan2 ngo5 lai4 faat3 sit3, nei5 mou5 je5 haa6 waa5? nei5 cing1 saan1 ceot1 lai4 gaa4?
    • Why did you unleash your frustration on me unprovoked? Are you out of your mind?
  2. Cantonese
    盏灯无神神眨眨下,好邪下㖞。
    盞燈無神神眨眨下,好邪下喎。
    zaan2 dang1 mou4 san4 san4 zaam2 zaam2 haa5, hou2 ce4 haa5 wo3.
    • The light was suddenly flickering for no reason, that is so spooky.
  3. Cantonese
    佢唔知做咩,无神神喺度大叫。
    佢唔知做咩,無神神喺度大叫。
    • I don't know what's wrong with him. He screamed out loud all of a sudden.
  4. Cantonese
    只手指入面啲资料无神神唔见晒。
    隻手指入面啲資料無神神唔見晒。
    • All data on the USB stick disappeared without any trace.