Definition of indubitably adverb from the Oxford Advanced American Dictionary

 

indubitably

 adverb
adverb
NAmE//ɪnˈdubət̮əbli//
 
(formal)
 
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in a way that cannot be doubted; without question He was, indubitably, the most suitable candidate.
indubitable
 
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adjective indubitable proof
See the Oxford Advanced Learner's Dictionary entry: indubitably