indubitably
(ad.)無疑地;確實地
In·du·bi·ta·bly, adv. Undoubtedly; unquestionably; in a manner to remove all doubt.
Oracles indubitably clear and infallibly certain. --Barrow.
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indubitably
adv : in a manner or to a degree that could not be doubted; "it
was immediately and indubitably apparent that I had
interrupted a scene of lovers"