gratis

adv. /ˈɡræt̬.ɪs/ C2

免费地；无偿地

Without payment or free of charge.

仙境例句

The March Hare poured the tea gratis, since nobody at the table had a penny.

三月兔免费给大家倒茶，因为桌边谁也没有一个便士。