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

 

steadfastly

 adverb
adverb
BrE BrE//ˈstedfɑːstli//
 
; NAmE NAmE//ˈstedfæstli//
 
(literary, approving)
 
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without changing in your attitudes or aims synonym firmly She steadfastly refused to speak.