Source : Webster's Revised Unabridged Dictionary (1913)

Pietistic \Pi`e*tis"tic\, Pietistical \Pi`e*tis"tic*al\, a.
   Of or pertaining to the Pietists; hence, in contempt,
   affectedly or demonstratively religious. --Addison.

Source : WordNet®

pietistical
     adj 1: of or relating to Pietism; "the Pietistic movement" [syn: {pietistic}]
     2: excessively or hypocritically pious; "a sickening
        sanctimonious smile" [syn: {holier-than-thou}, {pietistic},
         {pharisaic}, {pharisaical}, {sanctimonious}, {self-righteous}]