It sounds like a question being asked by someone who does not want to be heard. In other words, it is a little quieter than a whisper.

那声音比耳语还要轻微，好象提出了问题却又不愿被人听见似的。

youdao

"That was the beast, not me," he said in a hoarse whisper.

“那是野兽，不是我，”他用嘶哑的嗓音低语。

youdao

There was not even a whisper among the leaves, and the earth itself seemed to have stopped in its rotation.

树叶间连一丝低语都没有，地球似乎停止了自身的转动。

youdao

Viana was saying something, not in a whisper now, but as if muttering to himself.

NEWYORKER: While the Women Are Sleeping

But the riff comes back just as hard as before, if not harder, thanks in part to a staccato whisper that hits with percussive power.

NPR: Liam Finn And Eliza Jane: Shards Of Sound