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adverb

Synonym Chooser

How does the adjective deadly differ from other similar words?

Some common synonyms of deadly are fatal, lethal, and mortal. While all these words mean "causing or capable of causing death," deadly applies to an established or very likely cause of death.

a deadly disease

When would fatal be a good substitute for deadly?

In some situations, the words fatal and deadly are roughly equivalent. However, fatal stresses the inevitability of what has in fact resulted in death or destruction.

fatal consequences

When is lethal a more appropriate choice than deadly?

While in some cases nearly identical to deadly, lethal applies to something that is bound to cause death or exists for the destruction of life.

lethal gas

When could mortal be used to replace deadly?

The synonyms mortal and deadly are sometimes interchangeable, but mortal implies that death has occurred or is inevitable.

a mortal wound

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 deadly
Adjective
Ahead of the deadly hit-and-run, he was allegedly involved in a series of other crimes, including some electronic doorbell thefts on May 11, 2024 and a store robbery on May 17, 2024, according to police. Anthony Robledo, USA TODAY, 20 Mar. 2025 Such an assessment could have prevented the deadly Key Bridge collapse, NTSB Chair Jennifer Homendy said Thursday. Ayesha Ali, ABC News, 20 Mar. 2025
Adverb
But don’t be fooled by the apparent humor, the Hellcat crime group is deadly serious and wants $125,000 in the cryptocurrency Monero as well. Davey Winder, Forbes, 6 Nov. 2024 While delivered with a smile, the question was deadly serious in a congressional district with such an even partisan split that anything could happen to knock the future incumbent off kilter two years from now, as just happened to Democratic first-term Rep. Yadira Caraveo. John Aguilar, The Denver Post, 12 Nov. 2024 See All Example Sentences for deadly
Recent Examples of Synonyms for deadly
Adjective
  • In 2023, Idaho authorized the firing squad as a method of execution if lethal injection drugs were not available.
    William Lambers, Newsweek, 10 Mar. 2025
  • Seven have died in the electric chair and 39 by lethal injection.
    Jeffrey Collins, Los Angeles Times, 8 Mar. 2025
Adjective
  • The individual cores may not be as powerful as those on the Mac Studio with M4 Max, but the sheer number of CPU and GPU cores will deliver top performance in the most demanding applications.
    PCMAG, PCMAG, 11 Mar. 2025
  • While the sheer number of krill in the Southern Ocean means the species is unlikely to face an acute threat to its survival in the near term, Savoca is quick to point out that numbers are no guarantee of success.
    Gabe Castro-Root, Smithsonian Magazine, 11 Mar. 2025
Adjective
  • The second season of Percy Jackson and the Olympians doesn’t premiere until this winter, but Disney+ has an early treat for the show’s mortal fandom — it’s already been renewed for Season 3.
    Andy Swift, TVLine, 14 Mar. 2025
  • For Ray, the mortal stakes lie in not taking the bigger job (and bigger payout).
    Andy Andersen, Vulture, 14 Mar. 2025
Adverb
  • His run at Gonzaga was extremely memorable and had NBA teams incredibly excited for his potential.
    Mark Davis, Newsweek, 15 Mar. 2025
  • The calming mix of colloidal oatmeal, beta-glucan (a skin repairing molecule that smooths rough skin), and glycerin is extremely gentle and more than suitable for sensitive skin, too.
    Mary Honkus, Glamour, 15 Mar. 2025
Adjective
  • Sometimes the women might be bleeding seriously or has a miscarriage or other fatal issues.
    Ellie Kaufman, ABC News, 19 Mar. 2025
  • State police are seeking witnesses to a fatal bicyclist crash on Tuesday night in Canyon County.
    Sally Krutzig, Idaho Statesman, 19 Mar. 2025
Adjective
  • On an album filled with messages of self-love and empowerment, the penultimate track found Gaga singing her first unconditional love song — a bluesy, country-rock tribute to her ex-boyfriend Lüc Carl.
    Kristen S. Hé, Vulture, 19 Mar. 2025
  • If the meaning of life is to experience true and unconditional love, then that love has to start with us.
    Suzanne B. O'Brien, RN, Contributor, CNBC, 18 Mar. 2025
Adjective
  • The French Connection star, 95, and his classical pianist wife, 65 — who opted to live a quiet life in New Mexico away from the spotlight — were found dead at their property in Santa Fe Summit on Wednesday, Feb. 26.
    Becca Longmire, People.com, 14 Mar. 2025
  • Listen to this article A woman was found dead after a Waukegan house just after midnight Friday, the second blaze this month where firefighters were hampered by hoarding conditions inside the home.
    Clifford Ward, Chicago Tribune, 14 Mar. 2025
Adverb
  • In an incredibly clumsy move to penetrate the Chinese market, Facebook secretly released apps in the country through shell corporations without authorization, but supposedly with the tacit approval of China’s internet regulator.
    Miles Klee, Rolling Stone, 21 Mar. 2025
  • Digital partners that enable end to end supplier integration can have an incredibly powerful impact on supply chain operations for all involved.
    Kate Vitasek, Forbes, 21 Mar. 2025

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Cite this Entry

“Deadly.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/deadly. Accessed 24 Mar. 2025.

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