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Jyutping jau4 sam6
Pinyin yóu shèn

Definitions (Wiktionary)
  1. adj, formal
    especially bad or serious

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Jyutping jau4 sam6
Pinyin yóu shén

Definitions (粵典–words.hk)
  1. 副詞、書面語
    尤其​嚴重
    most seriously
    • 佢隻腳成日痛,落雨個陣尤甚。
      佢只脚成日痛,落雨个阵尤甚。
      His leg is always painful, most seriously on rainy days.
Examples (粵典–words.hk)
  1. Cantonese
    尤甚
    尤甚
    jau4 sam6
    • most seriously
  2. Cantonese
    佢只脚成日痛,落雨个阵尤甚。
    佢隻腳成日痛,落雨個陣尤甚。
    • His leg is always painful, most seriously on rainy days.