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Jyutping mou5 jam1 gung1
Pinyin mǎo yīn gōng

Definitions (CC-CANTO)
  1. cruel; unscrupulous; "so tragic!"; "so pitiful!"
Definitions (粵典–words.hk)
  1. 形容詞
    殘忍​;​殘酷​;​冷血
    cruel; heartless; evil
    • 乜你咁冇陰功打到隻狗噉樣架?
      乜你咁冇阴功打到只狗噉样架?
      mat1 nei5 gam3 mou5 jam1 gung1 daa2 dou3 zek3 gau2 gam2 joeng2 gaa3?
      How can you be so cruel to beat the dog like that?
  2. 形容詞
    陰功​;​可憐​;​慘
    poor; pitiful
    • 冇陰公嘍,乜你瘦成噉啊?
      冇阴公喽,乜你瘦成噉啊?
      mou5 jam1 gung1 lo3, mat1 nei5 sau3 seng4 gam2 aa3?
      How pitiful, you look so thin and unhealthy!
  3. 參看
    冇陰公
Definitions (Wiktionary)
  1. adj, Cantonese
    pitiful
    (syn.) 阴功, 陰功, 可憐, 可怜
  2. adj, Cantonese
    cruel; evil
Definitions (Kaifangcidian)
  1. 缺德
  2. 造孽
  3. 殘忍 – 残忍
  4. 悽慘 – 凄惨
  5. 可憐 – 可怜
Examples (粵典–words.hk)
  1. Cantonese
    白头人送黑头人,真系冇阴功啰。
    白頭人送黑頭人,真係冇陰功囉。
    baak6 tau4 jan4 sung3 hak1 tau4 jan4, zan1 hai6 mou5 jam1 gung1 lo3.
    • It's sad to see the old age person saw the young off
  2. Cantonese
    乜你咁冇阴功打到只狗噉样架?
    乜你咁冇陰功打到隻狗噉樣架?
    mat1 nei5 gam3 mou5 jam1 gung1 daa2 dou3 zek3 gau2 gam2 joeng2 gaa3?
    • How can you be so cruel to beat the dog like that?