Antonyms for the word "un-altered" could be "changed," "modified," "adjusted," "transformed" or "adapted." These words describe the process of altering something from its original state. When something is altered, it means that it has been intentionally manipulated or adjusted to become different from what it originally was. The opposite of this is to remain "un-altered," which indicates that no changes have been made. In certain contexts, it may be desirable for something to remain un-altered, while in others, altering it may be necessary. Regardless, understanding the antonyms of "un-altered" is essential for clear communication and effective use of language.