nicety in WordNet English dictionary

1. conformity with some esthetic standard of correctness or propriety
   "it was performed with justness and beauty"
   justness  rightness  nicety 
   
2. a subtle difference in meaning or opinion or attitude
   "without understanding the finer nuances you can't enjoy the humor"; "don't argue about shades of meaning"
   nuance  nicety  shade  subtlety  refinement