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Jyutping m4 dak1 dim1
Pinyin wú dé diān

Definitions (Wiktionary)
  1. adj, Cantonese
    no good; terrible; awful
  2. adj, Cantonese
    poor; difficult

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Jyutping m4 dak1 dim6
Pinyin wú dé diān

Definitions (粵典–words.hk)
  1. 形容詞
    情況​差​、​唔​理想​,​令人​憂心​、​悲觀
    (of situations) desperate; unfavourable
    • 你再係唔讀書唔得掂㗎喎!
      你再系唔读书唔得掂㗎㖞!
      nei5 zoi3 hai6 m4 duk6 syu1 m4 dak1 dim6 gaa3 wo3!
      If you keep ignoring your study you will get into a desperate situation.
Definitions (Kaifangcidian)
  1. 不得了
  2. 不可收拾
  3. 不可開交 – 不可开交
  4. 無法收拾 – 无法收拾

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Jyutping m4 dak1 dim6
Pinyin n2 de diān

Definitions (CC-CANTO)
  1. (slang) not okay; not good; no good; won't do; to be going through a hard / rough time
Examples (粵典–words.hk)
  1. Cantonese
    呢把刀好利,揩亲都唔得掂。
    呢把刀好利,揩親都唔得掂。
    ni1 baa2 dou1 hou2 lei6, haai1 can1 dou1 m4 dak1 dim6.
    • This knife is very sharp, even just touching it will give you a cut.
  2. Cantonese
    唔得掂
    唔得掂
    m4 dak1 dim6
    • not okay
  3. Cantonese
    你再系唔读书唔得掂㗎㖞!
    你再係唔讀書唔得掂㗎喎!
    nei5 zoi3 hai6 m4 duk6 syu1 m4 dak1 dim6 gaa3 wo3!
    • If you keep ignoring your study you will get into a desperate situation.
  4. Cantonese
    睇佢肉腾腾抽脂都唔得掂。
    睇佢肉騰騰抽脂都唔得掂。
    • He/she is so fat that even liposuction won't fix it.