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Jyutping dai1 nang4
Pinyin dī néng

Definitions (CC-CEDICT)
  1. incapable
  2. incompetent
  3. stupid
  4. mentally deficient
Definitions (粵典–words.hk)
  1. 形容詞
    智商​低​於​常人​,​因而​無​能力​照顧​自己​;​所以​亦​會​用​嚟​鬧​人​能力​低
    mental deficient; feeble-minded; stupid
    • 你個低能仔,死開啲啦。
      你个低能仔,死开啲啦。
      Get lost imbecile.
Definitions (Wiktionary)
  1. adj
    idiotic; stupid; incapable; incompetent
    (syn.) 低B
  2. adj, attributive
    low-energy
  3. adj
    feebleminded; intellectually disabled; of low intelligence
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)
  2. 智障
Examples (Tatoeba—Mandarin-English)
  1. Mandarin
    我们必须降低能源需求。
    我們必須降低能源需求。
    wǒ men bì xū jiàng dī néng yuán xū qiú 。
    • We must reduce energy demand.
    • We need to reduce the demand for energy.
Examples (粵典–words.hk)
  1. Cantonese
    你个低能仔,死开啲啦。
    你個低能仔,死開啲啦。
    • Get lost imbecile.
  2. Cantonese
    佢地成日做埋啲低能嘢,好多笑料㗎。
    佢地成日做埋啲低能嘢,好多笑料㗎。
    • They always do stupid stuff; there're a lot of jokes!
  3. Cantonese
    我系被摆布去到海德公园,玩埋我阿爸啲低能公关伎俩扮幸福家庭。
    我係被擺佈去到海德公園,玩埋我阿爸啲低能公關伎倆扮幸福家庭。
    ngo5 hai6 bei6 baai2 bou3 heoi3 dou3 hoi2 dak1 gung1 jyun2, waan2 maai4 ngo5 aa3 baa4 di1 dai1 nang4 gung1 gwaan1 gei6 loeng5 baan6 hang6 fuk1 gaa1 ting4.
    • I was manipulated to go to Hyde Park and play happy family as a lame PR stunt by my father.