The term "more controvertible" implies that something is highly debatable or open to dispute. Its opposite, "less controvertible," carries connotations of greater certainty or a lack of significant dissenting opinions. Another possible antonym is "unquestionable," which denotes a state of absolute certainty or truthfulness, leaving no room for disagreement or argument. Similarly, "indisputable" and "irrefutable" both express the idea of something that cannot be disputed or disputed with logic or evidence. On the other hand, "equivocal" and "ambiguous" are antonyms that describe a lack of clarity or ambiguousness in meaning, suggesting that a given statement or issue is open to multiple interpretations.