Source : Webster's Revised Unabridged Dictionary (1913)

Dishonesty \Dis*hon"es*ty\, n. [Cf. OF. deshonest['e], F.
   d['e]shonn[^e]tet['e].]
   1. Dishonor; dishonorableness; shame. [Obs.] ``The hidden
      things of dishonesty.'' --2 Cor. iv. 2.

   2. Want of honesty, probity, or integrity in principle; want
      of fairness and straightforwardness; a disposition to
      defraud, deceive, or betray; faithlessness.

   3. Violation of trust or of justice; fraud; any deviation
      from probity; a dishonest act.

   4. Lewdness; unchastity. --Shak.

Source : WordNet®

dishonesty
     n 1: the quality of being dishonest [ant: {honesty}]
     2: lack of honesty; acts of lying or cheating or stealing [syn:
         {knavery}]