In essence, “hypocrisy” refers to the act of claiming to believe something but acting in a different manner. The word is derived from the Greek term for “actor”—literally, “one who wears a mask”—in other words, someone who pretends to be what he is not.
The Bible calls hypocrisy a sin. There are two forms hypocrisy can take: that of professing belief in something and then acting in a manner contrary to that belief, and that of looking down on others when we ourselves are flawed.