Antonyms for the word "undeniabilities" are deniabilities, disputabilities, questionabilities, uncertainties, incredulities, and doubts. Where "undeniabilities" refers to something that is unquestionable, irrefutable, and absolute, its antonyms denote the opposite meaning. "Deniabilities" suggest the possibility of denying, rejecting, or questioning a claim, while "disputabilities" and "questionabilities" imply that there is room for debate, argument, or criticism regarding a topic. "Uncertainties" and "incredulities" suggest doubt, skepticism, or disbelief towards a statement or evidence. Therefore, depending on the context, antonyms for "undeniabilities" can be useful to express disagreement, skepticism, or uncertainty towards a given claim or argument.