noun (n)

• a lack of penetration or subtlety(noun.attribute)

  Synonym:
  simple mindedness, simplicity
  

  source: wordnet30
• the quality of being simple or uncompounded(noun.attribute)

  Synonym:
  simplicity
  Antonym:
  complexity, complexness
  

  source: wordnet30
• freedom from difficulty or hardship or effort(noun.attribute)

  Synonym:
  ease, easiness, simplicity
  Antonym:
  difficultness, difficulty
  

  source: wordnet30
• lack of ornamentation(noun.attribute)

  Synonym:
  chasteness, restraint, simplicity
  

  source: wordnet30
• The quality or state of being simple; simplicity.(noun)

  source: webster1913