The word "re-appear" means to show up again or to come back into view, but there are several antonyms for this term. The first is "disappear," which means to vanish or to become unseen. Another antonym is "vanish," which is to disappear suddenly or without explanation. "Withdraw" is also an antonym of "re-appear," meaning to take back or remove. "Disappear" is probably the most common antonym of "re-appear." Other antonyms may include "evaporate," "dissolve," or "fade away," all of which suggest something becoming invisible or fading from view.