The word "untenanted" refers to a property, building, or land which is not occupied by anyone. Its antonyms are words that have the opposite meaning, indicating that the property or land is occupied, has tenants or is being used or utilized. The antonyms of "untenanted" are "tenanted," "occupied," "inhabited," "populated,", "in use," "utilized," "taken," "leased," "rented," "utilized," "inhabited" and "filled." These antonyms emphasize the presence of people or activity in a certain location, indicating that it's being utilized or occupied, be it residential or commercial activities.