The word "more sonsie" is a Scottish term that refers to something that is pleasantly plump, attractive or charming. There are several synonyms that can be used to describe the same characteristics. For instance, the word "voluptuous" can be used to describe a person who is full-figured and has curves in all the right places. The term "buxom" is another synonym that can be used to describe a woman with a full and attractive figure. Additionally, the term "meaty" can be employed to describe someone who is plump but in a healthy way. Other synonyms that could be used to describe the "more sonsie" character include curvy, shapely, and full-bodied.