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Jyutping gwai2 zi1
Pinyin guǐ zhī

Definitions (CC-CANTO)
  1. god knows (spoken)
Definitions (粵典–words.hk)
  1. 語句
    表示​回答​嘅​人​對​問​題​無​興​趣​,​唔​知道​亦​都​唔​想​知道​答案
    an exclamation meaning that one doesn't know, is not interested in knowing, or doesn't know how to find out something, "who knows?", literally "ghost knows"
Definitions (Kaifangcidian)
  1. 誰知 – 谁知
  2. 誰曉得 – 谁晓得
Examples (粵典–words.hk)
  1. Cantonese
    唔鬼知佢嚟唔嚟啊!
    唔鬼知佢嚟唔嚟啊!
    m4 gwai2 zi1 keoi5 lai4 m4 lai4 aa3!
    • I don't freaking know if she will come!
  2. Cantonese
    鬼知佢搞咩唧!
    鬼知佢搞咩唧!
    gwai2 zi1 keoi5 gaau2 me1 zek1!
    • God knows what he's doing.
Examples (Wiktionary)
  1. Mandarin
    鬼知道!
    鬼知道!
    guǐ zhī dào !
    • Devil knows!