subtlety subtlety /ˈsʌtəlti/

noun

1. () The quality of being difficult to detect or analyze  ( niceness , subtlety )
   the quality of being difficult to detect or analyze
    You had to admire the subtlety of the distinctions he drew
   you had to admire the subtlety of the distinctions he drew
   
2. () A subtle difference in meaning, opinion or attitude  ( nicety , refinement , subtlety , nuance , shade )
   a subtle difference in meaning, opinion or attitude
    Without understanding the finer nuances you can't enjoy the humor
   without understanding the finer nuances you can't enjoy the humor
    Don't argue about shades of meaning
   don't argue about shades of meaning