The word "re-tiring" means to put new tires on a vehicle or to become tired again after feeling rested. Its antonyms include phrases like "un-tiring" which means to become refreshed and full of energy again, or "energizing" which refers to the process of providing energy or becoming energized. Other antonyms of "re-tiring" include "refreshing", "invigorating", and "stimulating", all of which depict the idea of newness and novelty. These antonyms are particularly useful when describing experiences that are rejuvenating, exciting, and invigorating rather than dull or mundane.