The antonym of "repair" can be defined as something that relates to breaking, harming, or damaging. For example, the opposite of repairing a damaged item would be vandalizing it or demolishing it altogether. Another antonym for "repair" could be neglect, which means to leave something unattended or disregard its maintenance needs entirely. Furthermore, abandoning a broken belonging, leaving it unfinished or giving up on it, is another antonym for "repair." Whatever the antonym may be, a failure to repair something typically results in an unsalvageable and ruined item.