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harmful

adjective
 
 
/ˈhɑːm.fəl/ US  /ˈhɑːrm-/

Definition

B2 causing harm: This group of chemicals is known to be harmful to people with asthma.Dangerous and harmful harmfully
 
 
/-i/ adverb
Dangerous and harmful
harmfulness
 
 
/-nəs/ noun [U]
(Definition of harmful adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
Focus on the pronunciation of harmful