- quietness, soundlessness - the property of making no sound
--1 is a kind of silence, quiet
--1 has particulars: noiselessness - tranquillity, tranquility, quietness, quietude - a state of peace and quiet
--2 is a kind of calmness
--2 has particulars:peace, peacefulness, peace of mind, repose, serenity, heartsease, ataraxis; easiness, relaxation