Confirmable refers to something that can be verified, proven or validated. Its antonyms, on the other hand, are words that convey the opposite meaning. One antonym for confirmable is unverifiable, which refers to something that cannot be confirmed or proven. Another antonym is uncertain or dubious, which suggests doubt or lack of confirmation. Moreover, deniable or contradictable can also be considered antonyms of confirmable because they connote the ability to argue or disprove a particular claim or statement. In contrast, undisputed, indisputable or proven are all synonyms of confirmable, as they denote something that is fully supported and verified.