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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