Source : Webster's Revised Unabridged Dictionary (1913)

Deceitfulness \De*ceit"ful*ness\, n.
   1. The disposition to deceive; as, a man's deceitfulness may
      be habitual.

   2. The quality of being deceitful; as, the deceitfulness of a
      man's practices.

   3. Tendency to mislead or deceive. ``The deceitfulness of
      riches.'' --Matt. xiii. 22.

Source : WordNet®

deceitfulness
     n : the quality of being crafty [syn: {craftiness}, {guile}]