Sanctimonious means false or hypocritical piety of righteousness.
Sanctimonious is an adjective.
Synonyms: pretentious, holier-than-thou, preachy.
Antonyms: humble, modest, unpretentious.
Mr.Ravi is unpretentious and truly modest; he doesn't have a sanctimonious bone in his heart.
The sanctimonious boy bragged that he gave his money to the temple, but he really gambled it away each week.