hypocrisy

People who go to church but don't believe in god? People who are vegetarians on a moral basis but wear leather jackets? They are engaging in hypocrisy, or behavior that is different from what they say they believe.

A hypocrite is a person who practices hypocrisy: what they say is not what they do. The noun hypocrisy descends from the Greek hypokrisis "acting on a stage," from hypokrinesthai "to play a part, pretend," from the prefix hypo- "under" plus krinein "to judge." Many times kids are enraged by their parents' hypocrisy when parents make their children follow rules they don't follow themselves.

Definitions of hypocrisy
1

n insincerity by virtue of pretending to have qualities or beliefs that you do not really have

Types:
sanctimoniousness, sanctimony
the quality of being hypocritically devout
fulsomeness, oiliness, oleaginousness, smarminess, unction, unctuousness
smug self-serving earnestness
Type of:
falseness, hollowness, insincerity
the quality of not being open or truthful; deceitful or hypocritical

n an expression of agreement that is not supported by real conviction

Synonyms:
lip service
Types:
crocodile tears
a hypocritical display of sorrow; false or insincere weeping
Type of:
dissembling, feigning, pretence, pretense
pretending with intention to deceive

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