grown-up
US /ˈɡroʊn.ʌp/
UK /ˈɡroʊn.ʌp/

1.
adulto
a fully developed person; an adult
:
•
When you're a grown-up, you can make your own decisions.
Quando sarai un adulto, potrai prendere le tue decisioni.
•
The children were told to act like grown-ups.
Ai bambini è stato detto di comportarsi come adulti.