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Jyutping gwai2 sei2 gam3
Pinyin guǐ sǐ gàn

Definitions (Wiktionary)
  1. adv, Cantonese, colloquial
    extremely; very; dead
    (syn.) 鬼咁
    • 部电视唔使开到鬼死咁大声。
      部电视唔使开到鬼死咁大声。
      bou6 din6 si6 m4 sai2 hoi1 dou3 gwai2 sei2 gam3 daai6 seng1.
      The TV doesn't need to be turned on so bloody loud.

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Jyutping gwai2 sei2 gam3
Pinyin guǐ sǐ hán

Definitions (粵典–words.hk)
  1. 副詞
    誇張​咁​形容​程度​好大​;​非常
    extremely; literally: ghost-deadly-like / as if ghosts died
    • 阿松佢鬼死咁懶,連續半年冇嘢做。
      阿松佢鬼死咁懒,连续半年冇嘢做。
      aa3 cung4 keoi5 gwai2 sei2 gam3 laan5, lin4 zuk6 bun3 nin4 mou5 je5 zou6.
      A-chung is extremely lazy, not having a job for half a year straight.
  2. 近義詞
    鬼咁

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Jyutping gwai2 sei2 gam2
Pinyin guǐ sǐ gān

Definitions (CC-CANTO)
  1. so (spoken)
Examples (粵典–words.hk)
  1. Cantonese
    阿松佢鬼死咁懒,连续半年冇嘢做。
    阿松佢鬼死咁懶,連續半年冇嘢做。
    aa3 cung4 keoi5 gwai2 sei2 gam3 laan5, lin4 zuk6 bun3 nin4 mou5 je5 zou6.
    • A-chung is extremely lazy, not having a job for half a year straight.
  2. Cantonese
    个party鬼死咁闷,我哋决定松人。
    個party鬼死咁悶,我哋決定鬆人。
    go3 paa1 ti4 gwai2 sei2 gam3 mun6, ngo5 dei6 kyut3 ding6 sung1 jan4.
    • The party was extremely boring. We (thus) decided to go.
  3. Cantonese
    佢好鬼寸嘴,所以同佢讲嘢鬼死咁劳气。
    佢好鬼寸嘴,所以同佢講嘢鬼死咁勞氣。
    • He is most arrogant, so talking with him is most agitating and irritating.
Examples (Wiktionary)
  1. Cantonese
    部电视唔使开到鬼死咁大声。
    部电视唔使开到鬼死咁大声。
    bou6 din6 si6 m4 sai2 hoi1 dou3 gwai2 sei2 gam3 daai6 seng1.
    • The TV doesn't need to be turned on so bloody loud.