Here:
adjective
-
1.expressing opinions on matters outside the scope of one's knowledge or expertise."“Dad, how do we know the universe is expanding?” inquires your six-year-old. Try answering that without resorting to an ultracrepidarian trick here or there"
noun
-
1.a person who expresses opinions on matters outside the scope of their knowledge or expertise."most patients are ultracrepidarians when it comes to medicine"