What is persistent belief in a demonstrable untruth or a provably inaccurate perception, despite clear evidence to the contrary?

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A delusion is a persistent belief in something that is demonstrably untrue, despite clear evidence to the contrary. It is a fixed false belief that is not based in reality and is not shared by others in the individual's cultural and social context. A delusion is different from a hallucination, which is a sensory perception that is not based in reality, and from an illusion, which is a misperception of an actual sensory stimulus. Confabulation refers to the creation of false memories or the filling in of gaps in memory with fabricated information.

What Is Persistent Belief in a Demonstrable Untruth or a Provably