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adverse

adjective [before noun]
 
 
/ˈæd.vɜːs/ /ədˈvɜːs/ US  /ædˈvɝːs/

Definition

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
 
 
/-li/
A lot of companies have been adversely affected (= in a harmful way) by the recession.Dangerous and harmful
(Definition of adverse adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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