inaudible

adj.听不见的,不可闻的

听不见的；难于听清的。

形容词

1、Due to the poor audio quality, some parts of the recording were inaudible.
由于音频质量差，录音的一些部分听不见了。
2、As the crowd grew louder, the speaker's voice became increasingly inaudible.
随着人群变得更喧嚣，演讲者的声音变得越来越难以听清。