The word "un-does" means to reverse or undo a previous action or task. Some antonyms for this word include "accomplish," "complete," "finish," "execute," "fulfill," "achieve," "perform," and "succeed." These words imply the opposite of undoing or reversing and suggest that a task or action is carried out successfully or to its full potential. For instance, accomplishing a task suggests that it was successful, while undoing something means it wasn't. Therefore, it is essential to pay close attention to the context of the word "un-does" to understand its meaning and its antonyms.