remorsefully

He looked at his broken guitar and sighed remorsefully, wishing he hadn't lost his temper.

(Chinese) 他看着自己摔坏的吉他，悔恨地叹了口气，心想自己要是没发脾气就好了。

The boy spoke remorsefully to the neighbor after accidentally breaking the window with a baseball.

(Chinese) 男孩在不小心用棒球打破窗户后，悔恨地对邻居说了话。