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WORDNET DICTIONARY

Adverbial indubitably has 1 sense

• indubitably(r = adv.all) beyond a doubt, beyond a shadow of a doubt, beyond doubt - 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"; "his guilt was established beyond a shadow of a doubt"

CIDE DICTIONARY

THESAURUS

indubitably

actually, admittedly, assuredly, beyond doubt, beyond question, by all odds, certainly, clearly, decidedly, demonstrably, dollars to doughnuts, doubtless, doubtlessly, for a certainty, for real, in all conscience, in all likelihood, in all probability, incontestably, indeed, indisputably, irrefragably, irrefutably, like enough, likely, manifestly, most likely, no doubt, noticeably, observably, obviously, out of question, patently, positively, presumably, presumptively, probably, quite, really, sensibly, seriously, ten to one, truly, unambiguously, undeniably, undoubtedly, unmistakably, unquestionably, verily, very like, very likely, visibly, without doubt

For further exploring for "indubitably" in Webster Dictionary Online