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

  

assuredly

 adverb
adverb
BrE BrE//əˈʃʊərədli//
 
, BrE//əˈʃɔːrədli//
 
; NAmE NAmE//əˈʃʊrədli//
 
(formal)
 
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certainly; definitely Their attempts will most assuredly fail.
See the Oxford Advanced American Dictionary entry: assuredly