of a critic, giving opinions on something beyond his or her knowledge

listen to the pronunciation of of a critic, giving opinions on something beyond his or her knowledge
Englisch - Englisch
ultracrepidarian

was the only person in New York who might be called, without intent to malign, an Ultracrepidarian critic. It was of the very nature of his job to find fault with small and insignificant details. -- The American Gun Mystery by Ellery Queen.