The word "brokendown" signifies something that is no longer functioning or operating as intended, which makes it an opposite of the words "operational" and "functioning." Other antonyms for "brokendown" include "fixed," "repaired," "renewed," "refurbished," and "restored." These words indicate a state of restoration or repair, which is antithetical to the state of being brokendown. The antonyms for "brokendown" have a positive connotation that denotes a return to normalcy or improved functionality. Therefore, when describing objects or systems that are in good working condition, it is more appropriate to use antonyms such as "functioning," "repaired," or "restored.