English to English

noun (n)

• a feeling of calmness; a quiet and undisturbed feeling(noun.feeling)

  Synonym:
  placidness
  

  source: wordnet30
• a disposition free from stress or emotion(noun.attribute)

  Synonym:
  quiet, repose, serenity, tranquility, tranquillity
  

  source: wordnet30
• The quality or state of being placid; calmness; serenity.(noun)

  source: webster1913