Antonyms for the word "un-tested" include words that indicate a level of certainty or reliability. Some possible antonyms include "tested," "proven," "certified," "verified," "validated," and "established." These antonyms suggest that something has undergone some form of evaluation, examination, or scrutiny, and has been found to be trustworthy or reliable. Conversely, the absence of any of these qualities may be indicated by terms such as "unreliable," "unfounded," "unsubstantiated," "speculative," or "unproven." By considering antonyms for a word like "un-tested," we can gain a better understanding of the range of meanings and implications associated with a particular concept or idea.