carefree

The children spent a carefree afternoon running through the sprinklers in the backyard.

(Chinese) 孩子们在后院的洒水器间奔跑，度过了一个无忧无虑的下午。

He missed the carefree days of his youth before he had to worry about paying bills.

(Chinese) 他怀念年轻时那种无忧无虑的日子，那时他还不必担心付账单。