Definition of "incontestably" [incontestably]

• In an incontestable manner. (adverb)

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• "Radium's discovery marked "incontestably" as Curie claimed, a new epoch for chemists and a kind of chemistry that we might well call "the chemistry of the imponderable.""
• "How far Sure Star has been a success matters because for Labour commentators like Polly Toynbee Sure Start is just about the one incontestably good thing this government has done."
• "[T] he best window we have on what a unitary national policy on race would have been during this era is the way that the federal government of that period addressed racial issues in those policy areas that were incontestably under its control."