/ ˈsʌtlti; NAmE / noun ( pl. -ies )
1.
[ U ] the quality of being subtle :
It's a thrilling movie even though it lacks subtlety.
2.
[ C , usually pl. ] the small but important details or aspects of sth :
the subtleties of language
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WORD ORIGIN
Middle English : from Old French soutilte , from Latin subtilitas , from subtilis fine, delicate.