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From The Collaborative International Dictionary of English v.0.48:
Subtile \Sub"tile\, a. [L. subtilis. See Subtile.] 1. Thin; not dense or gross; rare; as, subtile air; subtile vapor; a subtile medium. [1913 Webster] 2. Delicately constituted or constructed; nice; fine; delicate; tenuous; finely woven. "A sotil [subtile] twine's thread." --Chaucer. [1913 Webster] More subtile web Arachne can not spin. --Spenser. [1913 Webster] I do distinguish plain Each subtile line of her immortal face. --Sir J. Davies. [1913 Webster] 3. Acute; piercing; searching. [1913 Webster] The slow disease and subtile pain. --Prior. [1913 Webster] 5. Characterized by nicety of discrimination; discerning; delicate; refined; subtle. [In this sense now commonly written subtle.] [1913 Webster] The genius of the Spanish people is exquisitely subtile, without being at all acute; hence there is so much humor and so little wit in their literature. The genius of the Italians, on the contrary, is acute, profound, and sensual, but not subtile; hence what they think to be humorous, is merely witty. --Coleridge. [1913 Webster] The subtile influence of an intellect like Emerson's. --Hawthorne. [1913 Webster] 5. Sly; artful; cunning; crafty; subtle; as, a subtile person; a subtile adversary; a subtile scheme. [In this sense now commonly written subtle.] [1913 Webster] Syn: Subtile, Acute. Usage: In acute the image is that of a needle's point; in subtile that of a thread spun out to fineness. The acute intellect pierces to its aim; the subtile (or subtle) intellect winds its way through obstacles. [1913 Webster] -- Sub"tile*ly, adv. -- Sub"tile*ness, n. [1913 Webster]