D defs.my
Entry 4 senses Webster, 1913

Subtilty

· Sub·til·ty · IPA
01 n. The quality or state of being subtile; thinness; fineness; as, the subtility of air or light.
  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.[Obs.]
    “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.