SUBTILTY

subtilty|subtileness. Subtilty, or Subtileness, n. thinness, sliness, cunning

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Sub″til‐ty (?), n. [[Contr. fr. subtility.]] 1. 1. The quality or state of being subtile; thinness; fineness; as, the subtility of air or light.
2. 2. Refinement; extreme acuteness; subtlety.
Intelligible discourses are spoiled by too much subtility in nice divisions. Locke. 3. 3. Cunning; skill; craft.
To learn a lewd man this subtility. Chaucer. 4. 4. Slyness in design; artifice; guile; a cunning design or artifice; a trick; subtlety.
O full of all subtility and all mischief. Acts xiii. 10. ☞ In senses 2, 3, and 4 the word is more commonly written subtlety.