The term 'tedious person' can be described as a BORE, which is a four letter word. A BORE is someone who is dull and uninteresting, often causing others to become bored or disinterested in their company. They may talk too much about topics that are not interesting or relevant, or they may be overly serious and lack a sense of humor. Bores can also be overly critical or judgmental, making conversations uncomfortable or unpleasant.