subtility

sub·tile

S0855300 (sŭt′l, sŭb′təl)adj. Subtle.
[Middle English, from Old French subtil, from Latin subtīlis, fine, delicate; see subtle.]
sub′tile·ly adv.sub·til′i·ty (səb-tĭl′ĭ-tē), sub′tile·ness (sŭt′l-nĭs, sŭb′təl-), sub′til·ty (sŭt′l-tē, sŭb′təl-) n.