low tone

“Beeeeeer,” the voices said in a low tone.

"I've never heard her speak like this. It was very, very desperate, very low tone of voice. She may very well have been trying to be quiet, not to make noise."

“She speaks in a low tone of voice like she’s very saddened, she barely smiles,” said Ms. Tross Morris.

“Even right now, I am speaking to you in a low tone because if someone hears me, they can call the police who will come here and take me,” he said.

As we were thus conversing in a low tone while Old Barley’s sustained growl vibrated in the beam that crossed the ceiling, the room door opened, and a very pretty, slight, dark-eyed girl of twenty or so came in with a basket in her hand: whom Herbert tenderly relieved of the basket, and presented, blushing, as “Clara.”