The word irrefragable means impossible to refute or deny. Therefore, antonyms for the word "more irrefragable" would be words that suggest something is deniable or questionable. Some possible antonyms for "more irrefragable" include ambiguous, dubious, questionable, suspect, or unsettled. These antonyms imply that there is room for debate or dispute, and that the information or argument presented may not be completely sound or valid. In contrast, irrefragable suggests the opposite: that something is undeniably true or convincing. Using antonyms for "more irrefragable" helps to convey a sense of uncertainty or disbelief, and could be used to challenge or dispute a claim or argument.