老成 [ㄌㄠˇ ㄔㄥˊ; lao3 cheng2]
  mature
  experienced
  sophisticated
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  老成
  ろうせい
  adjectival nouns or quasi-adjectives (keiyodoshi)
  noun (common) (futsuumeishi)
  noun or participle which takes the aux. verb suru
  mature
  becoming precocious
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