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

 

unquestionably

 adverb
adverb
BrE BrE//ʌnˈkwestʃənəbli//
 
; NAmE NAmE//ʌnˈkwestʃənəbli//
 
(formal)
 
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without any doubt It was unquestionably a step in the right direction.