Word of the Day: 'Ultracrepidarian'

Here:

adjective 

1. 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. 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"