The word "pre-developed" refers to something that has already been developed or created beforehand. The antonyms for this word would include terms such as "undeveloped," "primitive," "raw," "rudimentary," "basic," "unrefined," and "unprocessed." These words describe something that is in its natural or initial state, that has not been modified or improved upon yet. Therefore, if we are referring to an undeveloped piece of land, we can say that it is raw or unrefined. On the other hand, if we are referring to a technology that is at its primary stage, we can use the term rudimentary or basic to describe it. In short, antonyms of "pre-developed" indicate something that is yet to go through the development process.