means The practice of claiming moral standards or beliefs you don't actually live up to, condemning in others what you quietly do yourself.

from From Greek hypokrisis, meaning 'acting on a stage' or 'playing a part' — a hypokrites was literally an actor, one who answers and speaks in dialogue beneath a mask. The word traveled through Late Latin and Old French into English, where the theatrical sense faded and the moral sense hardened: the hypocrite became someone performing virtue they don't possess, still wearing a mask, just no longer on a stage.