Pecksniffian

adj.
Hypocritically benevolent; sanctimonious.

[After Seth Pecksniff, a character in Martin Chuzzlewit, a novel by Charles Dickens.]

adjective

Of or practicing hypocrisy: hypocritical, pharisaic, pharisaical, phony, sanctimonious, two-faced. See honest/dishonest.

selfish and corrupt behind a display of seeming benevolence: sanctimonious