Meaning of “harmful” in the English Dictionary

"harmful" in British English

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harmfuladjective

uk /ˈhɑːm.fəl/ us /ˈhɑːrm.fəl/
harmfully
adverb uk /ˈhɑːm.fəl.i/ us /ˈhɑːrm.fəl.i/
harmfulness
noun [ U ] uk /ˈhɑːm.fəl.nəs/ us /ˈhɑːrm.fəl.nəs/

(Definition of “harmful” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)