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Jyutping sat1 geng1 mou4 san4
Pinyin shī jīng wú shén

Definitions (CC-CANTO)
  1. (a phrase) all of a sudden; (adverb) suddenly; precipitously
Definitions (粵典–words.hk)
  1. 副詞
    突然​間​,​無​啦​啦
    unexpectedly; suddenly; out of the blue
    • 你失驚無神大叫一聲,想嚇死人咩?
      你失惊无神大叫一声,想吓死人咩?
      nei5 sat1 geng1 mou4 san4 daai6 giu3 jat1 seng1, soeng2 haak3 sei2 jan4 me)?
      You scared the hell outta me with that sudden scream.
    • 你做咩失驚無神問埋啲咁認真嘅問題嘅?
      你做咩失惊无神问埋啲咁认真嘅问题嘅?
      nei5 zou6 me1 sat1 geng1 mou4 san4 man6 maai4 di1 gam3 jing6 zan1 ge3 man6 tai4 ge2?
      Why did you ask such a serious question all of a sudden?
  2. 參看
    失雞無神
Definitions (Wiktionary)
  1. phrase, Cantonese, idiomatic
    suddenly; unexpectedly; out of the blue
    (syn.) 驟然, 著陌生頭, 玄工, 一下子, 忽然間, 單下, 突然, 冷陌生頭, 倏忽, 著末生頭, 一下兒, 一下, 冒冷子, 冷不防, 猛然, 失雞無神, 辣末生頭, 乍猛地, 猝然, 虎拉巴兒, 著生頭裡, 陣時間, 冒猛子, 乍然, 乍麼實兒, 臨陣, 無張無持, 暴其然, 忽聲能, 陣間, 辣陌生頭, 辣末生裡, 冒猛地, 著陌生裡, 忽然, 雄險, 無張持, 雄雄, 突乎其然, 失驚忘神, 失驚無神, 突然之間, 乍乍地, 玄玄風, 驀地, 突然間, 忽然之間, 三不臨陣
Definitions (Kaifangcidian)
  1. 嚇得他臉色都變了 – 吓得他脸色都变了
  2. 受到驚嚇而恐懼慌張 – 受到惊吓而恐惧慌张
  3. 突然
  4. 冷不防
Examples (Tatoeba—Cantonese-English)
  1. Cantonese
    佢做咩失惊无神问埋啲咁认真嘅问题嘅?
    佢做咩失驚無神問埋啲咁認真嘅問題嘅?
    keoi5 zou6 me1 sat1 geng1 mou4 san4 man6 maai4 di1 gam3 jing6 zan1 ge3 man6 tai4 ge3 ?
    • Why all of a sudden did he ask me such a serious question?
  2. Cantonese
    失惊无神落大雨,搞到我全身湿晒。
    失驚無神落大雨,搞到我全身濕晒。
    sat1 geng1 mou4 san4 lok6 daai6 jyu5 , gaau2 dou3 ngo5 cyun4 san1 sap1 saai3 。
    • I was utterly soaked by the downpour.
Examples (粵典–words.hk)
  1. Cantonese
    佢趁我唔为意,失惊无神喺我耳边大嗌,吓到我成个人弹咗起身。
    佢趁我唔為意,失驚無神喺我耳邊大嗌,嚇到我成個人彈咗起身。
    keoi5 can3 ngo5 m4 wai4 ji3, sat1 geng1 mou4 san4 hai2 ngo5 ji5 bin1 daai6 aai3, haak3 dou3 ngo5 seng4 go3 jan4 daan6 zo2 hei2 san1.
    • He screamed right into my ears when I wasn't paying attention and scared me so much that I jumped out of my chair.
  2. Cantonese
    你失惊无神大叫一声,想吓死人咩?
    你失驚無神大叫一聲,想嚇死人咩?
    nei5 sat1 geng1 mou4 san4 daai6 giu3 jat1 seng1, soeng2 haak3 sei2 jan4 me)?
    • You scared the hell outta me with that sudden scream.
  3. Cantonese
    你做咩失惊无神问埋啲咁认真嘅问题嘅?
    你做咩失驚無神問埋啲咁認真嘅問題嘅?
    nei5 zou6 me1 sat1 geng1 mou4 san4 man6 maai4 di1 gam3 jing6 zan1 ge3 man6 tai4 ge2?
    • Why did you ask such a serious question all of a sudden?