The word "unbought" can be synonymous with a few different words, including unpurchased, unsold, unclaimed, and unowned. These words all indicate something that has not been acquired by anyone. "Unpurchased" and "unsold" specifically refer to something that has not been bought or sold yet, while "unclaimed" suggests something that has been left behind or not taken. "Unowned" can also refer to something that has not been claimed or purchased, and additionally suggests that there is no current owner. These words can all be used to describe a variety of things, from goods and products to land and property.