An erroneous belief the defies rational argument and despite all evidence to the contrary; this can also take the form of a psychiatric disorder manifest in conditions such as schizophrenia and paranoia.
gross misrepresentations of reality; false belief, strongly held despite evidence to the contrary, especially as a symptom of mental illness. Typical delusions include those of illness, persecution, romance, grandeur, and control.
Delusions are abnormal, false ideas or beliefs that people may develop, and that are not shared by those around them. For example, someone may be convinced that a stalker is trying to kill them or that they have been possessed by the devil.They may be features of primarily psychiatric disorders such as depression or schizophrenia, but may also be linked to neurological brain disease, such as variant CJD.