The Collaborative International Dictionary of English v.0.48:

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.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Sinner \Sin"ner\, v. i.
   To act as a sinner. [Humorous]
   [1913 Webster]

         Whether the charmer sinner it or saint it. --Pope.
   [1913 Webster]

WordNet (r) 3.0 (2006):

sinner
    n 1: a person who sins (without repenting) [syn: sinner,
         evildoer]