一問三不知 [－问－－－]

Jyutping jat1 man6 saam1 bat1 zi1
Pinyin yī wèn sān bù zhī

Definitions (CC-CEDICT)
  1. lit. to reply "don't know" whatever the question (idiom)
  2. fig. absolutely no idea of what's going on
  3. complete ignorance
Definitions (Wiktionary)
  1. phrase, idiomatic
    to answer “no idea” to every question; to have absolutely no idea of what is going on, or pretend to be unaware; completely ignorant
Definitions (Kaifangcidian)
  1. （沒有對應漢語詞彙）