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

 

undoubtedly

 adverb
adverb
BrE BrE//ʌnˈdaʊtɪdli//
 
; NAmE NAmE//ʌnˈdaʊtɪdli//
 
 
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used to emphasize that something exists or is definitely true synonym indubitably There is undoubtedly a great deal of truth in what he says.