呆若木雞 [－－－鸡]

Jyutping ngoi4 joek6 muk6 gai1
Pinyin dāi ruò mù jī

Definitions (CC-CEDICT)
  1. lit. dumb as a wooden chicken (idiom); fig. dumbstruck
Definitions (粵典–words.hk)
  1. 語句
    個樣​癡​癡​呆呆​，​又​或者​嚇呆​咗
    dumbstruck as a wooden chicken
Definitions (Wiktionary)
  1. phrase, idiomatic
    dumbstruck