The Collaborative International Dictionary
Subtility
Subtility \Sub*til"i*ty\, n. [L. subtilitas: cf. F. subtilit['e]. See Subtle.] Subtilty. [R.]
Douglas Harper's Etymology Dictionary
Wiktionary
subtility
n. (context obsolete English) cunning, craftiness.
Usage examples of "subtility".
Also the lady was of his avis and repreved the learningknight though she trowed well that the traveller had said thing that was false for his subtility.
Jamaica and covered a lot of ground since then, in places that were not friendly to black Vagabonds, had developed a kind of guile and subtility that Jack thought of as Oriental.