Nash hadn't raised his voice, still spoke rather softly, confidentially.

纳什没有提高嗓门，仍然很轻地、悄悄地说。

《柯林斯英汉双解大词典》

Do you feel as if you should sleep, Miss? Asked Bessie, rather softly.

“你觉得该睡了吗，小姐？”贝茜问，口气相当温存。

youdao

If you try it aloud, you will probably say it rather softly, conversationally.

WSJ: Word Craft: Tracy Kidder and Richard Todd on Good Prose