Jisho

×
Expressions (phrases, clauses, etc.), Noun
1. (an) adult their age (should, should not, etc.); grown man (woman); person who is old enough (to know better)See also いい年をして, oft. used sarcastically
Other forms
良い大人 【いいおとな】良い大人 【よいおとな】

Discussions

to talk about this word.