There are several synonyms for the word "unconfutable," which means impossible to dispute or discredit. One synonym could be "undeniable," which means something that cannot be denied or disputed. Another synonym could be "irrefutable," which means something that cannot be disproved or argued against. "Incontrovertible" could also be a synonym, meaning something that is certain and beyond doubt. Lastly, "unimpeachable" could be used as a synonym, which means something that cannot be questioned or doubted in terms of its integrity or honesty. All of these synonyms convey the same concept as "unconfutable" but offer different shades to its meaning.