ultracrepidarianism

ultracrepidarian +‎ -ism

ultracrepidarianism (uncountable)

1. (uncommon) The habit or act of giving opinions on matters outside the scope of one's knowledge.
   • 1993, Journal of World Trade, volume 27, numbers 1–3, page 53:

     The other is for the Gatt to steer off its slippery slope toward ultracrepidarianism and avoid any interference with national environmental policies, so long as they are not protectionist.

   • 2001, David Harley, Robert Slade, Urs E. Gattiker, Viruses Revealed: Understand and Counter Malicious Software, McGraw Hill Professional, →ISBN, pages xxxii–xxxiii:

     Unfortunately, people who are competent in some areas of security sometimes overestimate their own competence in other areas, and viruses seem to attract a particularly virulent brand of ultracrepidarianism (“acting or speaking outside one's ability or knowledge”).

   • 2011, Iain D. Thomson, Heidegger, Art, and Postmodernity, Cambridge University Press (2011), →ISBN, page 214 (footnote):

     The unabashed ultracrepidarianism evident in most mainstream philosophers' use and abuse of "postmodernism" is itself provocative.

• cobbler, keep to your last
• Nobel disease