Definition of subtilty

• n. - The quality or state of being subtile; thinness; fineness; as, the subtility of air or light.
• n. - Refinement; extreme acuteness; subtlety.
• n. - Cunning; skill; craft.
• n. - Slyness in design; artifice; guile; a cunning design or artifice; a trick; subtlety.