·noun Cunning; skill; craft.
II. Subtilty ·noun Refinement; extreme acuteness; subtlety.
III. Subtilty ·noun Slyness in design; artifice; guile; a cunning design or artifice; a trick; subtlety.
IV. Subtilty ·noun The quality or state of being subtile; thinness; fineness; as, the subtility of air or light.