A pretending to be what one is not or to feel what one does not really feel.
Example:
The protesters were objecting to the hypocrisy of doing business with a government whose racist policies were condemned by everyone.
Hypocrisy comes from a Greek word that means "the act of playing a part on stage." A hypocrite is a person who says or does one thing while thinking or feeling something entirely different underneath. Most of us are good at detecting hypocritical behavior in others, but we don't always see it so easily in ourselves.