adverse

adjective

ad-ˈvərs How to pronounce adverse (audio)
Definition of adversenext
1
as in unfavorable
opposed to one's interests all the adverse publicity really caused the movie star's popularity to suffer

Synonyms & Similar Words

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Antonyms & Near Antonyms
2
as in detrimental
causing or capable of causing harm the adverse effects of the drug are too severe to allow it to be marketed

Synonyms & Similar Words

Antonyms & Near Antonyms

Example Sentences

Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Recent Examples of adverse Gastrointestinal problems, such as nausea, were the most common adverse events, generally experienced as doses were increased. — Mike McRae 09, New Atlas, 10 Oct. 2026 The team’s findings, published last week in Nature Communications, reveal that, when given such a drug, rodents suffer adverse reactions similar to the paranoia human cannabis users feel. — Cody Cottier, Scientific American, 7 Oct. 2026 Subsequent trials in the late 1960s and ’70s eventually proved its effectiveness, and the drug ultimately was recognized for exerting strong antipsychotic effects with virtually no adverse impacts on motor function. — Encyclopedia Britannica, 7 Oct. 2026 Unlike prior records this year, this latest run has been narrowly lead by a few stocks tied to the AI hype and deemed unfettered by adverse macroeconomic headwinds. — Deena Zaidi,sean Conlon, CNBC, 6 Oct. 2026 See All Example Sentences for adverse
Recent Examples of Synonyms for adverse
  1. unfavorable
  2. detrimental
  3. negative
  4. harmful
  5. hostile
  6. damaging
  7. dangerous
  8. bad
Adjective
  • The most egregious perpetrators of fraud in the industry were corrupt doctors who were paid by patients to send insurance companies medical examination reports that omitted unfavorable findings.
    — Literary Hub, Literary Hub, 20 Oct. 2026
  • Democratic socialism is underwater by 22 points, 37% of Americans are favorable and 59% are unfavorable.
    — ABC News, ABC News, 18 Oct. 2026
Definition of unfavorable
Adjective
  • The company still faces numerous personal injury claims and a separate federal case involving a group of nationwide school districts that also focus on allegations that apps like Instagram have had detrimental effects on the well being of children.
    — Jonathan Vanian, CNBC, 21 Oct. 2026
  • Often, those firms’ IT heads think those changes are detrimental.
    — Scharon Harding, ArsTechnica, 21 Oct. 2026
Definition of detrimental
Adjective
  • As for gas, it has usually been treated as a waste product to be burned off; because there are so few pipelines to bring it to market, West Texas gas prices have even dipped negative this year.
    — Tim McDonnell, semafor.com, 22 Oct. 2026
  • The mood in the markets turned sharply negative today as traders sold off stock around the world.
    — Jim Edwards, Fortune, 22 Oct. 2026
Definition of negative
Adjective
  • Social media giant Meta was hit with a class action lawsuit in Australia on behalf of children and teenagers who allegedly suffered harm over the addictive design features and exposure to harmful content on its platforms Facebook and Instagram.
    — Chad de Guzman, Time, 22 Oct. 2026
  • Their contracts can run hundreds of pages, making harmful terms easy to bury.
    — Emma Witman, Fortune, 21 Oct. 2026
Definition of harmful
Adjective
  • About 70% of the members of Brazil’s lower house and 80% of the Senate are considered to be hostile to environmental and climate agendas, according to the observatory.
    — ABC News, ABC News, 22 Oct. 2026
  • In a turnabout from Orbán’s hostile approach to Kyiv, Magyar’s government has expressed solidarity with Ukraine and designated Russia a national security threat.
    — Justin Spike, Los Angeles Times, 21 Oct. 2026
Definition of hostile
Adjective
  • Trump could decide that appearing powerless as Iranian attacks push up prices is more damaging than another round of military strikes.
    — Ali Vaez, Time, 21 Oct. 2026
  • Lycopene can help protect blood vessels from the damaging effects of unstable molecules known as free radicals.
    — MD Published, Verywell Health, 17 Oct. 2026
Definition of damaging
Adjective
  • Swimmers should remain out of the water due to dangerous surf conditions.
    — NC Weather Bot, Charlotte Observer, 18 Oct. 2026
  • Fresh to strong winds will produce dangerous boating conditions, high surf, life-threatening rip currents, and moderate beach erosion through at least the first half of the coming week, forecasters said.
    — Felix Rodriguez, The Orlando Sentinel, 18 Oct. 2026
Definition of dangerous
Adjective
  • High oil prices are bad for Asia, which imports most of its fuel.
    — Jim Edwards, Fortune, 22 Oct. 2026
  • Futures are worse, Asia closed deep in the red, and Europe is also broadly lower.
    — Leonie Kidd, CNBC, 22 Oct. 2026
Definition of bad

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Cite this Entry

“Adverse.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/adverse. Accessed 25 Oct. 2026.

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