Definition of harmfulness noun from the Oxford Advanced Learner's Dictionary

 

harmfulness

 noun
noun
BrE BrE//ˈhɑːmflnəs//
 
; NAmE NAmE//ˈhɑːrmflnəs//
 
[uncountable](rather formal)
 
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the fact of causing damage or injury to somebody/something, especially to a person's health or to the environment