ul-truh-krep-uh-DAIR-ee-uhn · noun, adjective
ultracrepidarian
A person who gives opinions on subjects beyond their knowledge; or relating to such opinions.
Where the word comes from
From Latin ultra crepidam, “beyond the sandal,” in a story about a shoemaker who criticized a painting beyond his expertise.
In a sentence
“The panel invited specialists so the discussion would not drift into ultracrepidarian guesswork.”