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Definition of adverse adjective from the Oxford Advanced American Dictionary

 

adverse

 adjective
adjective
NAmE//ədˈvərs//
 
, NAmE//ædˈvərs//
 
, NAmE//ˈædvərs//
 
[usually before noun]
 
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negative and unpleasant; not likely to produce a good result adverse change/circumstances/weather conditions Lack of money will have an adverse effect on our research program. They have attracted strong adverse criticism. This drug is known to have adverse side effects.
adversely adverb
 
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Her health was adversely affected by the climate.
See adverse in the Oxford Advanced Learner's Dictionary