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Jyutping m4 saang1 sing3
Pinyin wú shēng xìng

Definitions (粵典–words.hk)
  1. x
Definitions (Wiktionary)
  1. noun, Cantonese
    immature; not sensible
Definitions (Kaifangcidian)
  1. 不懂事
  2. 沒出息 – 没出息

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Jyutping m4 saang1 sing3
Pinyin n2 shēng xing

Definitions (CC-CANTO)
  1. (slang) immature; not sensible
Examples (粵典–words.hk)
  1. Cantonese
    大个仔喇,仲唔生性。
    大個仔喇,仲唔生性。
    daai6 go3 zai2 laa3, zung6 m4 saang1 sing3.
    • You're a big boy now, but you're still not well-behaved.
Examples (Wiktionary)
  1. Cantonese
    佢真系唔生性。
    佢真系唔生性。
    keoi5 zan1 hai6 m4 saang1 sing3.
    • (S)he's not a well-behaved kid.
  2. Cantonese
    个个唔生性将D麻烦带返家中哥哥又吸毒阿妹又出钟发生乜嘢事都有警察拜访家中连妈妈都话唔可以留多一秒钟 [Cantonese, trad.]个个唔生性将D麻烦带返家中哥哥又吸毒阿妹又出钟发生乜嘢事都有警察拜访家中连妈妈都话唔可以留多一秒钟
    個個唔生性將D麻煩帶返家中哥哥又吸毒阿妹又出鐘發生乜嘢事都有警察拜訪家中連媽媽都話唔可以留多一秒鐘 [Cantonese, trad.]个个唔生性将D麻烦带返家中哥哥又吸毒阿妹又出钟发生乜嘢事都有警察拜访家中连妈妈都话唔可以留多一秒钟
    go3 go3 m4 saang1 sing3 zoeng1 di1 maa4 faan4 daai3 faan1 gaa1 zung1 go4 go1 jau6 kap1 duk6 aa3 mui2 jau6 ceot1 zung1 faat3 sang1 mat1 je5 si6 dou1 jau5 ging2 caat3 baai3 fong2 gaa1 zung1 lin4 maa4 maa1 dou1 waa6 m4 ho2 ji5 lau4 do1 jat1 miu5 zung1
    • Everyone is not well-behaved, bringing troubles back home / elder brother is taking drugs, younger sister is doing outcalls / no matter what happens the police visits our home / even mum says she couldn't stay for a second longer