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Jyutping tung4 sam1
Pinyin tóng xīn

Definitions (CC-CEDICT)
  1. childish heart
  2. childish innocence
Definitions (粵典–words.hk)
  1. 名詞
    小朋友​天真​無​邪​嘅​本性
    child's heart; childlike innocence
    • 童心未泯
      童心未泯
      tung4 sam1 mei6 man5
      (of aged people) to preserve trace of childlike innocence or playfulness; to retain a childlike heart
  2. 近義詞
    童真
Definitions (Wiktionary)
  1. noun
    childlike innocence; childish heart; child-like inner self
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)
Examples (Tatoeba—Mandarin-English)
  1. Mandarin
    汤姆童心未泯。
    湯姆童心未泯。
    tāng mǔ tóng xīn wèi mǐn 。
    • Tom maintained his innocence.
Examples (粵典–words.hk)
  1. Cantonese
    童心未泯
    童心未泯
    tung4 sam1 mei6 man5
    • (of aged people) to preserve trace of childlike innocence or playfulness; to retain a childlike heart