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Jyutping sei2 ceon2
Pinyin sǐ chǔn

Definitions (CC-CANTO)
  1. (slang) extremely foolish; damn stupid
Definitions (粵典–words.hk)
  1. 名詞、形容詞
    形容​人極​之蠢
    extremely stupid; a stupid fool
Definitions (Wiktionary)
  1. noun, Cantonese
    fool, idiot
Definitions (Kaifangcidian)
  1. 愚笨
  2. 蠢得很厲害 – 蠢得很厉害
Examples (粵典–words.hk)
  1. Cantonese
    明明系个新同事死蠢唔识做嘢,老板竟然比只死猫我食,话我无好好教好佢。
    明明係個新同事死蠢唔識做嘢,老闆竟然比隻死貓我食,話我無好好教好佢。
    ming4 ming4 hai6 go3 san1 tung4 si6 sei2 ceon2 m4 sik1 zou6 je5, lou5 baan2 ging2 jin4 bei2 zek3 sei2 maau1 ngo5 sik6, waa6 ngo5 mou5 hou2 hou2 gaau3 hou2 keoi5.
    • Obviously, it was the incompetence of our new colleague that led to this mess, but my boss made me the scapegoat, blaming me for not teaching her properly.
Examples (Wiktionary)
  1. Cantonese
    你班死蠢老千 你咁渣点去千
    你班死蠢老千 你咁渣点去千
    nei5 baan1 sei2 ceon2 lou5 cin1, nei5 gam3 zaa2 dim2 heoi3 cin1
    • You stupid swindlers, you suck so bad, how are you going to swindle?