indisputably
advUS /ˌɪn.dɪˈspju.tə.bli/
Etymology From indisputable + -ly. By surface analysis, in- + disputably.
1
In a manner that is incapable of being disputed or argued against.
- It is, perhaps, the most brilliant of all the Westinghouse inventions, and is indisputably one of the cleverest devices ever produced by the human brain.1946 November and December, “George Westinghouse, 1846-1914”, in Railway Magazine, page 375: