The niceties of a situation are its details, especially with regard to good manners or the appropriate behaviour for that situation. By the end of term, girls will have learnt the niceties of dinner party conversation He wasted no time with social niceties
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"