"niceties" in the noun sense
1. justness, rightness, nicety
conformity with some esthetic standard of correctness or propriety
"it was performed with justness and beauty"
2. nuance, nicety, shade, subtlety, refinement
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"
Source: WordNet® (An amazing lexical database of English)
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