Meaning of “adverse” in the English Dictionary

"adverse" in British English

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adverseadjective [ 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.

More examples

  • He attracted a lot of adverse publicity with his speech about unmarried mothers.
  • Reactions to the proposal so far have been adverse, but we may convince people in time.
  • The world record attempt was postponed due to adverse conditions.
  • He knew there would be an adverse reaction from his friends, so he tried to keep their affair secret.
  • It is clear that these violent films have an adverse effect on children.
adversely
uk /ˈæd.vɜːs.li/ /ədˈvɜːs.li/ us /ædˈvɝːs.li/

A lot of companies have been adversely affected (= in a harmful way) by the recession.

(Definition of “adverse” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"adverse" in American English

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adverseadjective

us /ædˈvɜrs, ˈæd·vɜrs/

going against something, or causing harm:

Her policies may have adverse effects on the economy.

(Definition of “adverse” from the Cambridge Academic Content Dictionary © Cambridge University Press)

"adverse" in Business English

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adverseadjective [ before noun ]

uk /ˈædvɜːs/ us

harmful or likely to cause problems:

A chain reaction of adverse events in the financial markets has put lenders under severe pressure.
adverse effect/impact/change Recent bad publicity has had an adverse effect on sales.
adverse conditions/consequences/circumstances Many experts believe it may be too late to prevent adverse consequences to the world's climate system.
adverse reaction/side-effect Some people have adverse reactions to additives and preservatives used in many foods.

(Definition of “adverse” from the Cambridge Business English Dictionary © Cambridge University Press)