What term is used for faulty interpretations of reality that cannot be shaken despite clear evidence to the contrary?

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Delusions are defined as false beliefs that are firmly held despite clear evidence to the contrary. Fantasies are not necessarily based on reality, but they are not necessarily seen as false. Hallucinations involve perceiving things that are not actually present, while defense mechanisms are psychological strategies used to cope with anxiety or other difficult emotions.

What Term Is Used for Faulty Interpretations of Reality That