1. in a way that cannot be heard; so quietly as to be imperceptible to the ear

Examples

• She whispered inaudibly to her friend during the movie.
• The old man muttered inaudibly under his breath.
• The wind chimes moved inaudibly in the still air.
• He spoke so inaudibly that no one could understand him.
• The cat padded inaudibly across the wooden floor.
• She sighed inaudibly, hoping no one would notice her disappointment.