noun cunning; skill; craft.
2. subtilty ·noun refinement; extreme acuteness; subtlety.
3. subtilty ·noun slyness in design; artifice; guile; a cunning design or artifice; a trick; subtlety.
4. subtilty ·noun the quality or state of being subtile; thinness; fineness; as, the subtility of air or light.