蒙在鼓裡 [－－－里]

Jyutping mung4 zoi6 gu2 leoi5
Pinyin méng zài gǔ lǐ

Definitions (CC-CEDICT)
  1. lit. kept inside a drum (idiom)
  2. fig. completely in the dark
Definitions (Wiktionary)
  1. phrase, idiomatic
    to be kept in the dark