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Jyutping nou5 caan4
Pinyin nǎo cán

Definitions (CC-CEDICT)
  1. moronic
  2. brainless
  3. bonehead
  4. retard
Definitions (粵典–words.hk)
  1. 形容詞
    鬧人蠢​、​鈍​、​傻
    stupid; braindead
Definitions (Wiktionary)
  1. adj, derogatory, neologism, slang
    brain-dead; stupid
  2. noun, derogatory, neologism, slang
    a stupid person