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Jyutping sin2 wai4 jan4 zi1
Pinyin xiǎn wéi rén zhī

Definitions (CC-CEDICT)
  1. rarely known to anyone (idiom); almost unknown
  2. secret to all but a few
Definitions (粵典–words.hk)
  1. 語句
    好少​人知​;​冇​乜​人知
    (formal) not well-known; recondite
    • 呢個名人嘅童年生活鮮為人知。
      呢个名人嘅童年生活鲜为人知。
      ni1 go3 ming4 jan4 ge3 tung4 nin4 sang1 wut6 sin2 wai4 jan4 zi1.
      The childhood of this celebrity is not well-known.
  2. 近義詞
    不為人知
Definitions (Wiktionary)
  1. phrase, idiomatic
    to be rarely known to anyone; to be secret to all but a few
Examples (粵典–words.hk)
  1. Cantonese
    呢个名人嘅童年生活鲜为人知。
    呢個名人嘅童年生活鮮為人知。
    ni1 go3 ming4 jan4 ge3 tung4 nin4 sang1 wut6 sin2 wai4 jan4 zi1.
    • The childhood of this celebrity is not well-known.
  2. Cantonese
    鲜为人知
    鮮為人知
    sin2 wai4 jan4 zi1
    • rarely known by others