WordRel.com

• a disposition free from stress or emotion

  synonym	placidityquietreposeserenitytranquillity
  hypernym	calmcalmnesscomposureequanimity
  hyponym	ataraxia

• a state of peace and quiet

  synonym	quietnessquietudetranquillity
  derivation	tranquil
  hypernym	calmness
  hyponym	ataraxiseasinessheartseasepeacepeace of mindpeacefulnessrelaxationreposeserenity

• an untroubled state; free from disturbances

  synonym	quiettranquillity
  hypernym	order