quiet

noun
The absence of sound; quietness.The absence of movement; stillness, tranquility

verb
To become quiet, silent, still, tranquil, calm.To cause someone to become quiet.

adjective
With little or no sound; free of disturbing noise.Having little motion or activity; calm.Not busy, of low quantity.Not talking much or not talking loudly; reserved.Not showy; undemonstrative.Requiring little or no interaction.

interjection
Be quiet.