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

Relevance

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
  • Hyperscalers opine on how detrimental electrical outages are to their business.
    — Drew Robb, Time, 15 Oct. 2026
  • Kennon, who is currently being held in Falkenburg Road Jail, was released from the program due to conduct detrimental to the team, the school said.
    — Ryan Morik OutKick, FOXNews.com, 14 Oct. 2026
Definition of detrimental
Adjective
  • To that end, Musk’s average favorability rating — net negative 16 percentage points as of Wednesday, according to Decision Desk HQ — has additionally improved, although only slightly, since July 2025 when his favorability was at its nadir.
    — Naomi Lim, The Washington Examiner, 15 Oct. 2026
  • The beats create ample negative space for Holden to employ riskier flows, often deploying a double-time pace to burn through technically dense passages.
    — Matthew Ritchie, Pitchfork, 15 Oct. 2026
Definition of negative
Adjective
  • Local government and outside groups have long strived to ban the popular tourist attraction that critics argue is harmful to horses’ well-being.
    — Claire Carter, The Washington Examiner, 14 Oct. 2026
  • Waters are becoming cloudier overall, while harmful algal blooms — measured through chlorophyll a levels — are trending in the wrong direction, the report found.
    — Adam Thompson, CBS News, 14 Oct. 2026
Definition of harmful
Adjective
  • That night, Lee goes to Ginger’s house to tell her what happened — about his hostile showdown with the rupidoop, about Brawny Dude With the Butter Candies checking out Lee’s van in the Boontill parking lot.
    — Amanda Whiting, Vulture, 15 Oct. 2026
  • The trip to Leeds is another daunting assignment for United in what is usually a hostile atmosphere.
    — ABC News, ABC News, 15 Oct. 2026
Definition of hostile
Adjective
  • Strong overnight thunderstorms brought heavy rain and damaging winds to the Kansas City metro, prompting a tornado warning for Clay County and leaving thousands of people without power Wednesday morning.
    — Kansas City Star, Kansas City Star, 14 Oct. 2026
  • In a culture marked by high-power distance, that’s a particularly damaging signal.
    — Ryoji Sekido, Fortune, 13 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
  • Bajaria may also have hit thin ice with Sarandos after the streamer won just 16 Primetime Emmy Awards this year — its worst showing since 2016 and down from 30 in 2025.
    — Matt Donnelly, Variety, 16 Oct. 2026
  • The size of the boat, the distance from the tow boat's berth and how bad the boat is stuck will all factor into the final invoice.
    — Joe Kinsey OutKick, FOXNews.com, 15 Oct. 2026
Definition of bad

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adversary
adverse
adversely
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Cite this Entry

“Adverse.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/adverse. Accessed 21 Oct. 2026.

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