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Jyutping ngoi4 tau4 ngoi4 nou5
Pinyin dāi tóu dāi nǎo

Definitions (Wiktionary)
  1. phrase, idiomatic
    slow and stupid-looking

呆頭呆腦 [-头-脑]

Jyutping
Pinyin dāi tóu dāi nǎo

Definitions (CC-CEDICT)
  1. oafish; dull-witted