English

Definition of adverse adjective from the Oxford Advanced Learner's Dictionary

 

adverse

 adjective
adjective
BrE BrE//ˈædvɜːs//
 
; NAmE NAmE//ˈædvɜːrs//
 
; BrE BrE//ədˈvɜːs//
 
; NAmE NAmE//ədˈvɜːrs//
 
[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 programme. They have attracted strong adverse criticism. This drug is known to have adverse side effects. Word Origin late Middle English: from Old French advers, from Latin adversus ‘against, opposite’, past participle of advertere, from ad- ‘to’ + vertere ‘to turn’. Compare with averse.Extra examples preparing ourselves for a potentially adverse reaction Adverse weather conditions meant the rescue had to be abandoned. Lack of money will have an adverse effect on the research programme. The new proposal should help those in adverse circumstances.
See the Oxford Advanced American Dictionary entry: adverse