JMdict: 2837544

いい大人 【いいおとな】

  1. [exp,n] (an) adult their age (should, should not, etc.); grown man (woman); person who is old enough (to know better)
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Kanji in this word:

Kanji Meanings On Readings Kun Readings
Large, Big ダイ, タイ おお-, おお.きい, -おお.いに
Person ジン, ニン ひと, -り, -と

Words often seen with this one: (experimental feature)

もう (10)