soi-disant /ˌswɑːdiːˈzɒ̃/adjective 2adverb 1 adjective2 •Of a person: self-styled, self-proclaimed, with implications of pretence or dishonesty.Geoffrey had gone out for a ride and returned suffering from complicated loss of memory. At the same time there had appeared on the scene the soi-disant Dr. Olivant. — 1934 •Of a thing: claimed to be something it is not; pretended, so-called.cicumstances which appear to have influenced his soi-disant historical labours. — 1845 adverb1 •Supposedly.