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English definition of “adverse”

adverse

adjective [before noun] uk   /ˈæd.vɜːs/ /ədˈvɜːs/ us    /ædˈvɝːs/
C2 having a negative or harmful effect on something: The match has been cancelled because of adverse weather conditions. They received a lot of adverse publicity/criticism about the changes. So far the drug is thought not to have any adverse effects.Dangerous and harmful
adversely
uk   /-li/ us  
A lot of companies have been adversely affected (= in a harmful way) by the recession.Dangerous and harmful
(Definition of adverse from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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