Subtlety
Pronunciation : Sub"tle*ty
Part of Speech : n.;
Etymology : [OE. sotelte, sutilte, OF. sotillete, L. subtilitas. See Subtle, and cf. Subtility.]
Definition : 1. The quality or state of being subtle, or sly; cunning; craftiness; artfulness. The fox which lives by subtlety. Shak.
2. Nice discernment with delicacy of mental action; nicety of discrimination.
3. Something that is sly, crafty, or delusive. Unlearned in the world's false subtleties. Shak.
pl. Subtleties.
Source : Webster's Unabridged Dictionary, 1913