More indefeasible means something that is absolutely unchallengeable or irrefutable. It is an adjective that describes a state of being impossible to overturn, contest or dispute. Its antonyms, on the other hand, refer to the opposite state, where something is subject to challenge, debate or doubt, and therefore cannot be considered as absolute. Some of the antonyms for the word more indefeasible include vulnerable, dubious, disputable, contestable, or problematic. These words signify that there is a possibility for questioning or disputing the validity of a claim or argument. In summary, while more indefeasible denotes certainty and unwavering truth, its antonyms describe uncertainty and doubt.