Subtlety

The quality or state of being subtle, or sly; cunning; craftiness; artfulness.

Nice discernment with delicacy of mental action; nicety of discrimination.

Something that is sly, crafty, or delusive.

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"

the quality of being difficult to detect or analyze; "you had to admire the subtlety of the distinctions he drew"