Silent

1. Not speaking; indisposed to talk; speechless; mute; taciturn; not loquacious; not talkative.
2. Not pronounced; having no sound; quiescent; as, e is silent in "fable."
3. That which is silent; a time of silence.
4. Keeping at rest; inactive; calm; undisturbed; as, the wind is silent.
5. Free from sound or noise; absolutely still; perfectly quiet.
6. Having no effect; not operating; inefficient.