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Jyutping mou5 lei4 zing3 ging1
Pinyin mǎo lí zhèng jīng

Definitions (CC-CANTO)
  1. not behaving seriously
Definitions (粵典–words.hk)
  1. 形容詞、俚語
    嬉皮​笑​臉​,​一​啲​都​唔​正經​,​品行​同態度​規矩​都​唔​端莊
    used to criticise someone of joking about serious matters; literally: without a gram of seriousness
    • 大難臨頭,佢都仲冇厘正經,真係唔識死。
      大难临头,佢都仲冇厘正经,真系唔识死。
      daai6 naan6 lam4 tau4, keoi5 dou1 zung6 mou5 lei4 zing3 ging1, zan1 hai6 m4 sik1 sei2.
      Faced with absolute doom, he is still joking around, I don't think he knows how badly the situation is.
  2. 參看
    冇厘正經