Fuddyduddy is a term often used to describe someone who is old-fashioned and formal. However, there are several synonyms that can be used to describe such a person. For instance, a person who is old-fashioned can be described as being traditional or conservative. Similarly, a person who is formal can be described as being reserved or proper. Additionally, a person who is stubborn and sets in their ways can be described as being obstinate or inflexible. Using these synonyms can help to convey the same meaning as fuddyduddy, but in a more varied and nuanced way.