undisputed
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.”
Typically used attributively before a noun like 'champion', 'leader', or 'fact'.
“Pickford came in for familiar criticism following his performances against Ghana and Argentina despite reinforcing his status as England’s undisputed No 1 goalkeeper across the tournament.”
“But experts had gathered no undisputed observations of the act itself.”
From un- + disputed.
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.