undisputed
adj. C1 Advanced US //ˌəndɪˈspjutɪd// UK //ʌndɪspjˈuːtɪd// undis·put·ed
adj. accepted by everyone as true or the best. No one argues about it because the facts are very clear.
adj. acknowledged by all parties as certain or superior; not open to question or doubt. Often used to describe a leader, a fact, or a champion whose status is beyond challenge.
She is the undisputed champion of the tournament.
After winning every major award this season, he became the undisputed leader in his field.
The discovery of the original manuscript provided undisputed evidence of the author's true intentions, effectively ending decades of academic debate on the subject.
From un- + disputed.
Usage
Typically used attributively before a noun like 'champion', 'leader', or 'fact'.