The definition of subtile, sometimes spelled subtle, is something that is indirect or a very small distinction between two things.(adjective)
An example of subtile used as an adjective is a subtile request, such as where someone mentions their favorite musician just before their birthday, hoping to be gifted their new album.
See subtile in Webster's New World College Dictionary
Origin: ME < MFr subtil, altered (infl. by L) < OFr soutil: see subtle
See subtile in American Heritage Dictionary 4
Origin: Middle English
Origin: , from Old French subtil
Origin: , from Latin subtīlis, fine, delicate; see subtle.