The word "undenied" means that something cannot be disputed or denied. Synonyms for this word could include "unquestionable," "irrefutable," "indisputable," "incontrovertible," or "unequivocal." All of these words emphasize the fact that there is no room for doubt or argument when it comes to the truth of a particular statement or idea. Other synonyms might include "undeniable," "certain," "absolute," or "undeniably true." Whatever word you choose, the important thing is to convey the idea that something is so clear and obvious that it cannot be refuted or disputed by anyone.