Unbuilt on is a term that means unclaimed or undeveloped land that is available for use or purchase. Some synonyms for unbuilt on include vacant, unoccupied, unutilized, and unused. These words suggest that land is available for development and that no structures or buildings exist on the land. Other synonyms for unbuilt on include open, available, free, and clear. These words convey an opportunity or potential for land use that has yet to be realized. Unbuilt on land can be found in both urban and rural areas and is often used for commercial or residential development, agriculture, or preservation purposes.