A delusion is a belief held with strong conviction despite superior evidence to the contrary

Delusions are false beliefs based on incorrect inference about external reality that persist despite the evidence to the contrary.

Delusional disorder, previously called paranoid disorder, is a type of serious mental illness called a "psychosis" in which a person cannot tell what is real from what is imagined. The main feature of this disorder is the presence of delusions, which are unshakable beliefs in something untrue.

An idiosyncratic belief or impression that is firmly maintained despite being contradicted by what is generally accepted as reality or rational argument, typically a symptom of mental disorder.

A delusion is a belief that is not true : a false idea or belief that is caused by mental illness

A delusion is a rigid system of beliefs with which a person is preoccupied and to which the person firmly holds, despite the logical absurdity of the beliefs and a lack of supporting evidence.

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