Source : Webster's Revised Unabridged Dictionary (1913)

Sinner \Sin"ner\, n.
   One who has sinned; especially, one who has sinned without
   repenting; hence, a persistent and incorrigible transgressor;
   one condemned by the law of God.

Sinner \Sin"ner\, v. i.
   To act as a sinner. [Humorous]

         Whether the charmer sinner it or saint it. --Pope.

Source : WordNet®

sinner
     n : a person who sins (without repenting) [syn: {evildoer}]