Finding synonyms for the phrase "boring person" can be a challenging task, but there are many alternative words or phrases that can be used. A dull or unexciting person can be called a snooze fest, a wet blanket, or a straight-laced individual who lacks spontaneity. A tedious or tiresome individual can be referred to as a plodder or a drudge. A person who lacks personality or charisma can be called insipid, bland, or lackluster. Alternatively, the phrase "one-note" can be used to describe someone who is limited in interests or conversation topics. Whatever term is used, it's important to remember that everyone has unique qualities and characteristics that make them interesting.