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

 

vastly

 adverb
adverb
BrE BrE//ˈvɑːstli//
 
; NAmE NAmE//ˈvæstli//
 
 
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very much I'm a vastly different person now. The quality of the training has vastly improved. This candidate is vastly more experienced than the others.
See the Oxford Advanced American Dictionary entry: vastly