A psychopathological condition that may be associaed with delirium or dementia and characterized by the gradual formation of delusions, usually of a persecutory nature and often accompanied by related hallucinations.

An individual who has fixed systematized delusions, is suspicious, has a persecution complex, is resentful and bitter, and is a megalomaniac (mental condition where the patient exhibits delusions of grandeur or a greatly enhanced opinion of himself/herself).