The word "re-did" is a verb that means to do something again, but with different or improved outcomes. There are many antonyms for this word, including "undo," "reverse," "cancel," "nullify," "invalidate," and "annul." All of these words denote the act of going back to a previous state, instead of doing something again or anew. Antonyms can be helpful when trying to express different shades of meaning or to offer alternatives to a particular word. By knowing the antonyms of a word, you can expand your vocabulary and become a more effective communicator.