Sanctimonious
adj. Pretending to be righteous
Sentences
My sanctimonious friend looks down upon people who cheat, but she passed History last year by copying someone else's answers.
Valerie is a sanctimonious girl who talks condescendingly to people who don't volunteer, but she has never volunteered outside of the required hours for school.
Antonyms: humble, meek, modest
The Big Bang Theory - Sheldon is always right (from s03e22).avi