"subtlety" in the noun sense
1. 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"
2. subtlety, niceness
the quality of being difficult to detect or analyze
"you had to admire the subtlety of the distinctions he drew"
Source: WordNet® (An amazing lexical database of English)
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