The word "re-sided" implies changing or renewing the exterior of a building. Its antonyms would be related to the opposite of this process. Some possible antonyms for "re-sided" could include words such as "neglected," "ignored," or "abandoned." These words describe a state of disrepair or lack of maintenance, which is the opposite of an improvement or renovation. Other possible antonyms for "re-sided" might be "unchanged," "stagnant," or "static," as these words describe situations where no alteration or improvement has taken place. Whatever the antonym used, it should represent a state of decline or lack of change, as opposed to an improvement or renewal.