As "un-derived" means not having been derived or originating from another source, its antonyms would be "derived," "inherited," "acquired," or "obtained." These words indicate that something has come from a source, either through genetic or cultural means, rather than being original or unique. The opposite meaning of "un-derived" implies that something has a history or predecessor, while its antonyms signify a lack of those factors. Using antonyms such as these can help to convey the specific meaning and intent behind the use of "un-derived," and can provide a useful tool for understanding nuances of language and communication.