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See: artifice, bad faith, deception, error, fallacy, false pretense, figment, hoax, insanity, lunacy, phantom, ruse, sham

DELUSION, med. jurisp. A diseased state of the mind, in which persons believe things to exist, which exist only, or in the degree they are conceived of only in their own imaginations, with a persuasion so fixed and firm, that neither evidence nor argument can convince them to the contrary.
     2. The individual is, of course, insane. For example, should a parent unjustly persist without the least ground in attributing to his daughter a course of vice, and use her with uniform unkindness, there not being the slightest pretence or color of reason for the supposition, a just inference of insanity, or delusion, would arise in the minds of a jury: because a supposition long entertained and persisted in, after argument to the contrary, and against the natural affections of a parent, suggests that he must labor under some morbid mental delusion. 3 Addams' R. 90, 91; Id. 180; Hagg. R. 27 and see Dr. Connolly's Inquiry into Insanity, 384; Ray, Med. Jur. Prel. Views., Sec. 20, p. 41, and Sec. 22, p. 47; 3 Addams, R. 79; 1 Litt. R. 371 Annales d'Hygiene Publique, tom. 3, p. 370; 8 Watts, 70; 13 Ves. 89; 1 Pow. Dev. by Jarman, 130, note Shelf. on Lun. 296; 2 Bouv. Inst. n. 2104-10.

References in periodicals archive ?
Grandiose delusions may develop as defence strategies against being negatively evaluated and the negative affective consequences linking to the perceived threatening interpersonal context.
Suahil and Ghauri speculated that the high association of grandiose delusions with more religious patients might be attributed to their relationship with an omnipotent force and that their "connection may confer the idea of being super human" (p.
John is showing unexplained bouts of aggression, grandiose delusions and hallucinations - all symptoms of a psychotic illness.
Prepubertal and early adolescent pibolarity differentiate from ADHD by manic symptoms, grandiose delusions, ultra-rapid or ultradian cycling.
Among the PEA-BP subjects, approximately 6O%, 51%, and 25% experienced total psychosis, grandiose delusions, and suicidality, respectively.