纯净的用英语可以说作 "pure". 来源是拉丁语 "purus"，意思是纯洁的、未被污染的。

例句：

The water from that spring is pure and refreshing. (那个泉水是纯净的，可以让人爽心。)

She has a pure heart and always thinks of others before herself. (她有一颗纯洁的心，总是想到别人的感受。)

He makes a pure and sincere apology for his mistake. (他为自己的错误深深地道歉。)