Antonyms for the word "more proven" include "less certain," "untested," "unproven," and "doubtful." When something is considered "more proven," it means that there is a wealth of evidence that supports its validity or effectiveness. Using antonyms to describe the opposite of "more proven" implies that the validity and effectiveness of something is not widely supported or is in question. When making decisions or forming opinions, it is important to consider both sides of an argument or idea to determine the level of certainty and evidence for or against it.