Source : Webster's Revised Unabridged Dictionary (1913)

Fraudulent \Fraud"u*lent\, a. [L. fraudulentus, fr. fraus,
   fraudis, frand: cf. F. fraudulent.]
   1. Using fraud; trickly; deceitful; dishonest.

   2. Characterized by,, founded on, or proceeding from, fraund;
      as, a fraudulent bargain.

            He, with serpent tongue, . . . His fraudulent
            temptation thus began.                --Milton.

   3. Obtained or performed by artifice; as, fraudulent
      conquest. --Milton.

   Syn: Deceitful; fraudful; guileful; crafty; wily; cunning;
        subtle; deceiving; cheating; deceptive; insidious;
        treacherous; dishonest; designing; unfair.

Source : WordNet®

fraudulent
     adj : intended to deceive; "deceitful advertising"; "fallacious
           testimony"; "smooth, shining, and deceitful as thin
           ice" - S.T.Coleridge; "a fraudulent scheme to escape
           paying taxes" [syn: {deceitful}, {fallacious}]