What are the opposite words for un contestable?

The antonyms for the word "uncontestable" would be "controversial," "debatable," "disputable," and "questionable." These words suggest that the matter is open for discussion and may not be considered as final or conclusive. While "uncontestable" implies that something cannot be contested or challenged, its antonyms suggest that there may be another side to the story or alternative viewpoints that could be considered. Being aware of these antonyms is essential when considering a claim or argument as it reminds us to remain critical and open-minded in our thinking before accepting it as fact.