FOLIE A DEUX By N., Pam M.S. - May 11, 2013 The most common shared psychotic disorder where 2 intimately related people have the same or similar delusions. French for double insanity. FOLIE A DEUX: "Folie a deux is French for 2 people with a shared disorder." Related Psychology Terms FOLIE A TROIS FOLIE A QUATRE FOLIE A CINQ DELUSIONAL DISORDER SUBSTANCE-INDUCED PSYCHOTIC DISORDER UNDIFFERENTIATED SCHIZOPHRENIA CYCLOID PSYCHOSIS PARANOIA COTARD'S SYNDROME PARANOID PSYCHOSIS Cite this page: N., Pam M.S., "FOLIE A DEUX," in PsychologyDictionary.org, May 11, 2013, https://psychologydictionary.org/folie-a-deux/ (accessed March 31, 2020).