A false belief is an incorrect or irrational idea that someone holds to be true. It can take many forms, such as a FALLACY, DELUSION, old wives' tale, or SUPERSTITION. A FALLACY is an argument that uses incorrect logic to reach a conclusion. A DELUSION is a false belief that is held despite evidence to the contrary. An old wives' tale is a superstitious belief that has been passed down through generations. SUPERSTITION is a belief in supernatural forces or luck that cannot be proven.