おとな 大人びる Show inflections LinksSentence search for 大人びるSentence search for おとなびるKanji details for 大 and 人Edit in JMdict Ichidan verb, Intransitive verb1. to look (sound, behave) grown-up; to be adult-like; to matureusu. 〜た/て Discussions Log in to talk about this word.