The word "un-tried" refers to something that has not been tested or proven. Its antonym, on the other hand, would be "tried." Something that is tried has been tested or proven successful. Another antonym for un-tried could be "experienced." An experienced person or thing has the knowledge or skill acquired through familiarity with a particular task or activity. Another word that could be used as the antonym for un-tried is "proven." Proven refers to something that has been tried and tested and has resulted in success. In conclusion, the antonyms for un-tried would be "tried," "experienced," and "proven.