From Longman Dictionary of Contemporary Englishself-appointedˌself-apˈpointed adjective THINK/HAVE THE OPINION THATgiving yourself a responsibility, job, position etc without the agreement of other people, especially those you claim to represent – used to show disapproval
Examples from the Corpus
self-appointed• Vigilantes were the self-appointed administrators of justice and public executioners.• These self-appointed assistants sped swiftly up and down the corridor, wakening their companions and spreading the good news.• Fifthly, the periodic meetings of Great Powers which together acted as self-appointed guarantors of international law and order.• We won't be intimidated by self-appointed guardians of educational standards.• He was our self-appointed guide to Bouilland, population 136, sixteen kilometres from Beaune.• He is also the self-appointed heckler-in-chief to the Tories.• Because he was literate and articulate, he showed a bitter contempt for the self-appointed intellectuals of the inter-war years.• For years now, self-appointed surgeons without the appropriate training have been performing life-threatening operations usurping the skills of consultant plastic surgeons. 