quiet

adjective: making little or no noise
- The library was quiet, with only the rustle of pages breaking the silence.
adjective: (of a person) tending not to speak much
- She was a quiet child who preferred reading to socializing.
adjective: characterized by calm and tranquility
- The lake was quiet under the moonlight.
adjective: (of a feeling or an attitude) definite but not expressed in an obvious way
- He had an air of quiet authority.
adjective: carried out discreetly, secretly, or with moderation
- The negotiations were kept quiet to avoid public scrutiny.
verb: to make or become quiet; to calm
- She tried to quiet the crying baby.