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Jyutping lou5 sing4
Pinyin lǎo chéng

Definitions (CC-CEDICT)
  1. mature
  2. experienced
  3. sophisticated
Definitions (粵典–words.hk)
  1. 形容詞
    歷練​、​經歷​多​而​變得​成熟​;​做事​穩重
    experienced; mature
    • 呢個細路仔講嘢好老成。
      呢个细路仔讲嘢好老成。
      lei1 go3 sa3i lou6 zai2 gong2 je5 hou2 lou5 sing4.
      This little child talks very maturely.
Definitions (Wiktionary)
  1. adj
    experienced and steady; advanced in years and virtue; mature; sophisticated
    • 老成凋謝
      老成凋谢
      lǎo chéng diāo xiè
      An old and virtuous person has passed away.
  2. adj, literary
    skilfully written
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)
Examples (粵典–words.hk)
  1. Cantonese
    呢个细路仔讲嘢好老成。
    呢個細路仔講嘢好老成。
    lei1 go3 sa3i lou6 zai2 gong2 je5 hou2 lou5 sing4.
    • This little child talks very maturely.
Examples (Wiktionary)
  1. Mandarin
    老成凋谢
    老成凋謝
    lǎo chéng diāo xiè
    • An old and virtuous person has passed away.