The often paranoid delusion that different people are in fact a single person who changes appearance or is in disguise. It may be related to a brain lesion.

(historical) The psychological/psychiatric delusion that one is made of glass and will shatter if one sits on a hard surface or is struck.

plural of delusion of adequacy

(usually in the plural) The false belief that one is adequate; the belief that one is doing a competent job when one is actually incompetent.

plural of Capgras delusion

plural of Fregoli delusion

plural of self-delusion

Fregoli delusion

plural of delusion of doubles

plural of optical delusion