Silent
Part of speech: adjective
Definition: Free from sound or noise; absolutely still; perfectly quiet. Not speaking; indisposed to talk; speechless; mute; taciturn; not loquacious; not talkative. Keeping at rest; inactive; calm; undisturbed; as, the wind is silent. Parnell. Sir W. Raleigh. (pronunciation) Not pronounced; having no sound; quiescent; as, "e is silent in fable." Having no effect; not operating; inefficient. Without audio capability.
Part of speech: noun
Definition: That which is silent; a time of silence. A silent movie
Example sentence: It's a victory when the weapons fall silent and people speak up.
Inaudible
Part of speech: adjective
Definition: Not able to be heard or not loud enough to be heard.