Source : Webster's Revised Unabridged Dictionary (1913)

Peccant \Pec"cant\, a. [L. peccans, -antis, p. pr. of peccare to
   sin: cf. F. peccant.]
   1. Sinning; guilty of transgression; criminal; as, peccant
      angels. --Milton.

   2. Morbid; corrupt; as, peccant humors. --Bacon.

   3. Wrong; defective; faulty. [R.] --Ayliffe.

Peccant \Pec"cant\, n.
   An offender. [Obs.] --Whitlock.

Source : WordNet®

peccant
     adj : liable to sin; "a frail and peccable mortal"- Sir Walter
           Scott [syn: {peccable}]