Subtilty Sub"til*ty, n. [Contr. fr. subtility.] 1. The quality or state of being subtile; thinness; fineness; as, the subtility of air or light. [1913 Webster]

2. Refinement; extreme acuteness; subtlety. [1913 Webster]

Intelligible discourses are spoiled by too much subtility in nice divisions. --Locke. [1913 Webster]

3. Cunning; skill; craft. [Obs.] [1913 Webster]

To learn a lewd man this subtility. --Chaucer. [1913 Webster]

4. Slyness in design; artifice; guile; a cunning design or artifice; a trick; subtlety. [1913 Webster]

O full of all subtility and all mischief. --Acts xiii. 10. [1913 Webster]

Note: In senses 2, 3, and 4 the word is more commonly written subtlety. [1913 Webster]

The Collaborative International Dictionary of English. 2000.