noun (n)

• conformity with some esthetic standard of correctness or propriety(noun.attribute)

  Synonym:
  justness, rightness
  

  source: wordnet30
• a subtle difference in meaning or opinion or attitude(noun.communication)

  Synonym:
  nuance, refinement, shade, subtlety
  

  source: wordnet30
• The quality or state of being nice (in any of the senses of that word.).(noun)

  source: webster1913