Ultracrepidarianism

I learnt this splendid word in an article about the eccentric English politician Jacob Rees-Mogg, who cultivates the air of an outdated aristocrat who has barely reached the 19^th century, let alone the 21^st. It means the habit of giving opinions and advice on matters outside of one’s knowledge. https://en.m.wikipedia.org/wiki/Ultracrepidarianism

The man himself would be proud to use it.