The word "in disputable" refers to something that is beyond doubt or dispute. Therefore, its antonyms would be words that convey doubt, controversy, or uncertainty. Some possible antonyms include disputable, questionable, uncertain, unreliable, doubtful, debatable, contentious, ambiguous, and unclear. These words carry the opposite meaning of "in disputable" and suggest that something is subject to interpretation, debate or argumentation. Therefore, using antonyms for "in disputable" can help to create a more nuanced understanding of a topic, acknowledging different points of view and highlighting areas of disagreement or uncertainty.