The antonyms for the word "un-fixing" are words that denote the opposite actions - something that is being fixed or repaired. The most common antonym for un-fixing is "fixing" or "repairing". Additional antonyms include "mending", "remedying", "restoring", "fixing up", "putting back", "improving", and "reconditioning". All these antonyms are synonymous with repairing and restoring something to its original condition. When something is un-fixed, it means it is broken, damaged or not functioning properly, hence using the antonyms of "un-fixing" is an important part of maintaining or repairing any electrical or mechanical equipment.