grown-up
🇺🇸
/ˌɡrəʊn ˈʌp/
🇬🇧
/ˌɡrəʊn ˈʌp/
fully developed as an adult in mind and body
When you're grown-up, you can make your own decisions.
appropriate for adults or like an adult
She spoke in a very grown-up manner for someone so young.
an adult person
The grown-up at the table explained the rules to the children.