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WORDNET DICTIONARY
CIDE DICTIONARY
THESAURUS

WORDNET DICTIONARY

Adverbial undeniably has 1 sense

• undeniably(r = adv.all) Array - to an undeniable degree or in an undeniable manner; "she is undeniably the most gifted student in the class"

CIDE DICTIONARY

THESAURUS

undeniably

actually, admittedly, assuredly, beyond doubt, beyond question, certainly, clearly, decidedly, demonstrably, doubtless, doubtlessly, for a certainty, for real, in all conscience, incontestably, indeed, indisputably, indubitably, irrefragably, irrefutably, manifestly, no doubt, noticeably, observably, obviously, out of question, patently, positively, quite, really, sensibly, seriously, truly, unambiguously, undoubtedly, unmistakably, unquestionably, verily, visibly, without doubt

For further exploring for "undeniably" in Webster Dictionary Online