hushed tone

"I guess you got the name wrong, Boy," he returned, in a hushed tone.

Simpson, feeling vaguely as if his world were somehow at stake, went about explaining particulars in a hushed tone.

"Don't speak so loud," said Harold Dercksz, in a hushed tone.

“I have never seen anything like this in the old country,” she breathed, in a low, hushed tone.

"This is wonderful—for me," King began, in the hushed tone befitting such a place—and the tone which suited his feelings as well.