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

 

impeccably

 adverb
adverb
BrE BrE//ɪmˈpekəbli//
 
; NAmE NAmE//ɪmˈpekəbli//
 
 
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in a way that has no mistakes or faults synonym perfectly (2) to behave impeccably impeccably dressed