noiseless

This new style of air conditioner is noiseless.

这种新型空调没有噪音。

given to almost noiseless fits of giggling.

喜欢发出一阵阵几乎无声笑。

the cycle is a benign form of transport, being noiseless and non-polluting.

自行车是一种无害交通工具，既安又无污染。

Noiseless apart from the babble of conversations that rise animatedly over the park's laidback soundtrack, it is singularly peaceful for a city centre location.

这里隔离了人们喧嚣谈话，没有一点噪声——它是市中心唯一一个安宁地方。