Definition of indubitably adverb from the Oxford Advanced Learner's Dictionary



BrE BrE//ɪnˈdjuːbɪtəbli//
; NAmE NAmE//ɪnˈduːbɪtəbli//
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in a way that cannot be doubted; without question synonym undoubtedly He was, indubitably, the most suitable candidate. Word Origin late Middle English: from Latin indubitabilis, from in- ‘not’ + dubitabilis (see dubitable) + -ly.
See the Oxford Advanced American Dictionary entry: indubitably