Source : Webster's Revised Unabridged Dictionary (1913)

Sanctimonious \Sanc`ti*mo"ni*ous\, a. [See {Sanctimony}.]
   1. Possessing sanctimony; holy; sacred; saintly. --Shak.

   2. Making a show of sanctity; affecting saintliness;
      hypocritically devout or pious. ``Like the sanctimonious
      pirate.'' --Shak. -- {Sanc`ti*mo"ni*ous*ly}, adv. --
      {Sanc`ti*mo"ni*ous*ness}, n.

Source : WordNet®

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