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Definitions

adverse

[ad-vurs, ad-vurs] / ædˈvɜrs, ˈæd vɜrs /
ADJECTIVE
unfavorable, antagonistic
Synonyms
STRONGEST
conflicting detrimental disadvantageous inimical injurious negative unfortunate unfriendly
WEAK
allergic to contrary down on down side have no use for inopportune opposed opposing opposite oppugning ornery reluctant repugnant stuffy unlucky unpropitious unwilling
Antonyms
STRONGEST
advantageous assisting beneficial friendly good helpful kind nice
WEAK
aiding auspicious favorable fortunate lucky propitious

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

What I said then is that unless you help people move from the jobs that were being destroyed to new jobs, there is no way that trade liberalization wouldn’t have adverse effects.

From Barron's • Apr. 7, 2026

There are big challenges in each chapter of life, and those can be exacerbated by adverse economic events.

From MarketWatch • Apr. 6, 2026

CalMac warned of further disruption across the network due to adverse weather and urged anyone travelling to check their journey.

From BBC • Apr. 5, 2026

“Of course any adverse event can be a flag,” said another former FDA official who worked in the compounding division when the peptides were categorized as unsafe.

From Salon • Apr. 4, 2026

"I need you to be careful with the flower of immortality when you find it. If you get contaminated by it—if its pollen or sap enters your system—there could be adverse side effects."

From "City of the Plague God" by Sarwat Chadda