Sub"til*ty (?), n. [Contr. fr. subtility.]
1.
The quality or state of being subtile; thinness; fineness; as, the subtility of air or light.
2.
Refinement; extreme acuteness; subtlety.
Intelligible discourses are spoiled by too much subtility in nice divisions.
Locke.
3.
Cunning; skill; craft.
[Obs.]
To learn a lewd man this subtility.
Chaucer.
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.
⇒ In senses 2, 3, and 4 the word is more commonly written subtlety.
© Webster 1913.