sanctimonious

excessively or hypocritically pious

Possessing sanctimony; holy; sacred; saintly.

Latin sanctus (holy) + -monious (characteristic of)

“At this thought she tried to release her hand, but he would not let it go; for the deaconess had come close to Agatha, and, in a tone of sanctimonious wrath, desired her to quit this scene.”

— Georg Ebers, The Historical Romances of Georg Ebers

“This is a little too sanctimonious a fraud to meet my old-fashioned ideas."Alpheus T.”