Nicety

The quality or state of being nice (in any of the senses of that word.).

Delicacy or exactness of perception; minuteness of observation or of discrimination; precision.

A delicate expression, act, mode of treatment, distinction, or the like; a minute distinction.

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"