If you describe someone as the undisputed leader or champion, you mean that everyone accepts their position as leader or champion. At 78 years of age, he's still undisputed leader of his country. after 10 years of undisputed power
If you describe a fact or opinion as undisputed, you are trying to persuade someone that it is generally accepted as true or correct. the undisputed fact that he had broken the (Hukuk) his undisputed genius
generally agreed upon; not subject to dispute; "the accepted interpretation of the poem"; "an accepted theory"