Source : Webster's Revised Unabridged Dictionary (1913)

Transgressively \Trans*gress"ive*ly\, adv.

         Adam, perhaps, . . . from the transgressive infirmities
         of himself, might have erred alone.      --Sir T.
                                                  Browne.
Transgressor \Trans*gress"or\, n. [L.: cf. F. transgresseur.]
   One who transgresses; one who breaks a law, or violates a
   command; one who violates any known rule or principle of
   rectitude; a sinner.

         The way of transgressors is hard.        --Prov. xiii.
                                                  15.

Source : WordNet®

transgressor
     n : someone who transgresses; someone who violates a law or
         command; "the way of transgressors is hard"