Definitions

1. adverb

in a way that is too soft to be heard; very softly

“She whispered inaudibly into his ear.”

2. adverb

in a way that is so quiet or muffled that it cannot be heard

“The baby cried inaudibly as she was put to bed.”

3. adverb

in a way that is too quiet or faint to be heard

“The music played inaudibly in the background.”