adj.无声的；寂静的
This new style of air conditioner is noiseless. 这种新型空调没有噪音。
For him the wheel of slumber was wont to turn noiseless and slick and swift. 在他看来，时间在睡眠中总是过得很快，静悄悄地就溜走了。
adv.静静地；轻轻地
