(imperative) Remain silent.

plural of quietness

Full of quiet.

plural of quieting

(informal) surreptitiously

Third-person singular simple present indicative form of quiet down

To remain silent. / (idiomatic) To refrain from talking about something; to keep a secret.

Tranquility; freedom from stress or interruptions.

(simile, idiomatic) Very quiet, so as to not be heard

(Britain) A rail coach on which unnecessary noise is discouraged.