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

Hira, a Manila tour guide, cringed as her sanctimonious client praised the church's holiness while secretly snapping pics with his phone, hidden behind a prayer book. "Must be praying to Ezra," Hira whispered to herself.

In Lahore's Badshahi Mosque courtyard, Khalid overheard a man lecturing passersby about the importance of modesty while adjusting his own overly elaborate prayer shawl. The sanctimonious tone didn't match the glint in his eye as he watched a group of schoolgirls walk by.

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