The antonym for the word "un-shapeliest" is "shapeliest". It implies something that possesses a pleasing or attractive form, aesthetically pleasing to the senses, and well-proportioned. This word can be used to refer to a variety of objects, such as buildings, clothing, or human physique. Other antonyms for "un-shapeliest" include charming, graceful, elegant, stylish, and refined. These words all suggest charm and beauty, qualities that are absent in anything that is unshapely. However, it's essential to remember that beauty lies in the eyes of the beholder, so what might be shapely and attractive to one person may not be so to another.