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Jyutping ngau4 pei4 dang1 lung4
Pinyin niú pí dēng lóng

Definitions (CC-CANTO)
  1. (proverb) someone is very stubborn; Someone is unteachable
Definitions (粵典–words.hk)
  1. 語句
    歇後語​─​─​「​點極​唔​明​」​;​即​係​話​一個​人蠢​鈍​、​固執​,​不斷​提點​都​唔​明白​問題​所在
    A sandwich pun, whose latter part means "no matter how you light it, it won't shine"; describes a stupid and stubborn person who never understands or follows what others tell him; literally, ox-skin lantern
    • 你正一牛皮燈籠嚟㗎,講到咁白你都收唔到。
      你正一牛皮灯笼嚟㗎,讲到咁白你都收唔到。
      nei5 zing3 jat1 ngau4 pei4 dang1 lung4 lai4 gaa3, gong2 dou3 gam3 baak6 nei5 dou1 sau1 m4 dou2.
      You are really stupid and stubborn like an ox-skin lantern. Everything's spelled out clearly, and you still can't get the answer.
  2. 反義詞
    話頭醒尾
Definitions (Wiktionary)
  1. phrase, idiomatic
    someone who understands in one's mind
  2. phrase, idiomatic
    stupid or stubborn person; someone who does not understand or listen to others
Examples (粵典–words.hk)
  1. Cantonese
    你正一牛皮灯笼嚟㗎,讲到咁白你都收唔到。
    你正一牛皮燈籠嚟㗎,講到咁白你都收唔到。
    nei5 zing3 jat1 ngau4 pei4 dang1 lung4 lai4 gaa3, gong2 dou3 gam3 baak6 nei5 dou1 sau1 m4 dou2.
    • You are really stupid and stubborn like an ox-skin lantern. Everything's spelled out clearly, and you still can't get the answer.