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Jyutping sam1 seon3 bat1 ji4
Pinyin shēn xìn bù yí

Definitions (CC-CEDICT)
  1. to believe firmly without any doubt (idiom)
  2. absolute certainty about sth
Definitions (粵典–words.hk)
  1. x
Definitions (Wiktionary)
  1. phrase, idiomatic
    to firmly believe without any doubt
    • 我對那人説的話深信不疑。
      我对那人说的话深信不疑。
      wǒ duì nà rén shuō de huà shēn xìn bù yí .
      I firmly believe in / have no doubt about what that person says.
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)
Examples (粵典–words.hk)
  1. Cantonese
    深信不疑
    深信不疑
    sam1 seon3 bat1 ji4
    • to be totally convinced beyond all doubt
Examples (Wiktionary)
  1. Mandarin
    我对那人说的话深信不疑。
    我對那人説的話深信不疑。
    wǒ duì nà rén shuō de huà shēn xìn bù yí .
    • I firmly believe in / have no doubt about what that person says.