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Jyutping tung4 sam1 mei6 man5
Pinyin tóng xīn wèi mǐn

Definitions (Wiktionary)
  1. phrase, idiomatic
    one's childish disposition remains even though he/she is grownup
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