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

 

harmfully

 adverb
adverb
BrE BrE//ˈhɑːmfəli//
 
; NAmE NAmE//ˈhɑːrmfəli//
 
(rather formal)
 
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in a way that causes damage or injury to somebody/something, especially to a person's health or to the environment