Source : Webster's Revised Unabridged Dictionary (1913)

Self-righteous \Self`-right"eous\, a.
   Righteous in one's own esteem; pharisaic.

Source : WordNet®

self-righteous
     adj : excessively or hypocritically pious; "a sickening
           sanctimonious smile" [syn: {holier-than-thou}, {pietistic},
            {pietistical}, {pharisaic}, {pharisaical}, {sanctimonious}]