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subtle
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] .
From The Collaborative International Dictionary of English v.0.48:
Subtle \Sub"tle\, a. [Compar. Subtler; superl. Subtlest.] [OE. sotil, subtil, OF. soutil, later subtil, F. subtil, L. subtilis; probably, originally, woven fine, and fr. sub under + tela a web, fr. texere to weave. See Text, and cf. Subtile.] 1. Sly in design; artful; cunning; insinuating; subtile; -- applied to persons; as, a subtle foe. "A subtle traitor." --Shak. [1913 Webster] 2. Cunningly devised; crafty; treacherous; as, a subtle stratagem. [1913 Webster] 3. Characterized by refinement and niceness in drawing distinctions; nicely discriminating; -- said of persons; as, a subtle logician; refined; tenuous; sinuous; insinuating; hence, penetrative or pervasive; -- said of the mind; its faculties, or its operations; as, a subtle intellect; a subtle imagination; a subtle process of thought; also, difficult of apprehension; elusive. [1913 Webster] Things remote from use, obscure and subtle. --Milton. [1913 Webster] 4. Smooth and deceptive. [Obs.] [1913 Webster] Like to a bowl upon a subtle ground [bowling ground]. --Shak. [1913 Webster] Syn: Artful; crafty; cunning; shrewd; sly; wily. Usage: Subtle is the most comprehensive of these epithets and implies the finest intellectual quality. See Shrewd, and Cunning. [1913 Webster]

