American English

Definition of harmful adjective from the Oxford Advanced American Dictionary

  

harmful

 adjective
adjective
NAmE//ˈhɑrmfl//
 
 
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 causing damage or injury to someone or something, especially to a person's health or to the environment the harmful effects of alcohol the sun's harmful ultraviolet rays Many household products are potentially harmful. harmful to somebody/something Fruit juices can be harmful to children's teeth.
NAmE//ˈhɑrmfəli//
 
adverb
harmfulness noun
 
[uncountable]
 
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See the Oxford Advanced Learner's Dictionary entry: harmful