Definition of adverse adjective from the Oxford Advanced American Dictionary

 

adverse

 adjective
adjective
NAmE//ədˈvərs//
 
, NAmE//æd‑//
 
, 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.
adverselyadverb
 
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Her health was adversely affected by the climate.
See the Oxford Advanced Learner's Dictionary entry: adverse