中文词源
subtility 隐约，微妙
subtile,隐约的，微妙的，-ity,名词后缀。
英语词源
- subtility (n.)
- late 14c., "acuteness, skill, cunning," alteration of subtlety (q.v.) on model of subtile, or else from Old French subtilite, from Latin subtilitas "fineness, simplicity."