▪ a subtle distinction, feature, or argument:"the subtleties of English grammar"Similarfinenesssubtlenessprecisionprecisenessnicenessnicetynuanceshadedetailslightnessminutenessnarrownesstenuousnessindistinctnessindefinitenesslack of definitionelusiveness
Word OriginMiddle English: from Old French soutilte, from Latin subtilitas, from subtilis ‘fine, delicate’ (see subtle).