The word "untried" means not tested, inexperienced, or unproven. An antonym for this term could be "experienced" or "seasoned." A person who is considered untried lacks the skills and knowledge required to successfully perform a task or handle a situation. The opposite of this would be someone who is capable and confident in their abilities. Other antonyms for untried could include "tested," "proven," "demonstrated," or "veteran." When referring to a product or idea, untried could also mean untested or speculative. Therefore, antonyms could include "verified" or "proven" if the item has undergone testing and has been found to work as intended.