1. Unable to be heard; too quiet or faint to be perceived by the ear
The speaker's voice became inaudible at the back of the hall.
A voz do orador tornou-se inaudível no fundo da sala.
2. Not capable of being heard due to distance, obstruction, or technical issues
The inaudible whisper made it impossible to understand what she said.
O sussurro inaudível tornou impossível entender o que ela disse.