Pre-pares means to make ready or to get ready in advance. The word pre-pares can have several antonyms depending on the context. When referring to the opposite of preparing for something, one antonym could be procrastination, which means delaying or putting off action. Another antonym could be neglect, which means to ignore or pay no attention to something. If used in the context of cooking, an antonym could be improvisation, which means making do with what is available instead of preparing beforehand. In any case, antonyms for pre-pares refer to the lack of preparation or the act of not being ready.