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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
Percy’s journey to set things right will take him off the map and into the deadly Sea of Monsters, where a secret fate awaits the son of Poseidon. Denise Petski, Deadline, 21 Aug. 2025 The two neighbors engaged in a brief but deadly conflict earlier this year – their worst in decades – with both sides striking deep into the other’s territory. Rhea Mogul, CNN Money, 21 Aug. 2025
Adverb
New Cook County State’s Attorney Eileen O’Neill Burke is off to a great start in her effort to target deadly enhanced guns that bring criminal mayhem into our communities. John Schmidt, Chicago Tribune, 21 Mar. 2025 Durst's oldest daughter was there when the shooting happened and is part of a growing tally of traumatized children left mourning a parent as Indianapolis grapples with how to curb arguments turning deadly. Jade Jackson, IndyStar, 4 July 2025 See All Example Sentences for deadly
Recent Examples of Synonyms for deadly
Adjective
  • Whether that lethal combination continues moving forward, time will tell.
    Chris Waugh, New York Times, 13 Aug. 2025
  • The prosecuting attorney for the 23rd Judicial District has ruled that two Cabot Police Department officers were justified in using lethal force in a May incident that didn't result in death or injury, the Arkansas State Police announced Tuesday.
    Daniel McFadin, Arkansas Online, 12 Aug. 2025
Adjective
  • The look was finished with a silk tulle veil, crystal beaded Manolo Blahnik satin sandals and a pair of sheer elbow gloves.
    Leah Dolan, CNN Money, 14 Aug. 2025
  • Founder Samantha Brett emphasizes layering SPF over makeup, with formulas like their Beauty Screen Mineral Tints providing SPF50 protection in a sheer, wearable finish.
    Laia Farran Graves, Forbes.com, 14 Aug. 2025
Adjective
  • When the theater faces demolition, Thida must decide whether to move on to her next life or remain earthbound after developing an unexpected relationship with Hai, a mortal man.
    Naman Ramachandran, Variety, 15 Aug. 2025
  • And Lovell could not—would not—subject Marilyn, whom the exploding oxygen tank had nearly widowed, to yet one more launch, one more mission, one more roll of the mortal dice.
    Jeffrey Kluger, Time, 9 Aug. 2025
Adverb
  • Bonus content includes a behind-the-scenes look at the airplane and ocean stunts, deleted footage montage with optional commentary by Director Christopher McQuarrie, the challenges of filming the technical and extremely dangerous stunts, and an in-depth discussion with McQuarrie and Cruise.
    Anthony Robledo, USA Today, 18 Aug. 2025
  • Prioritize child and pet safety: Be vigilant about never leaving young children and pets in vehicles without supervision, especially during periods of intense heat, as car interiors can quickly become extremely hot.
    CA Weather Bot, Sacbee.com, 18 Aug. 2025
Adjective
  • Peacock 'Sharp Corner' This unsettling thriller features Ben Foster as a man who becomes overly obsessed with the fatal car crashes that happen at a sharp corner in the road in front of his new home.
    Brian Truitt, USA Today, 23 Aug. 2025
  • The brother of an Indian truck driver charged in a fatal Florida turnpike crash has been arrested by Immigration and Customs Enforcement (ICE), officials announced on Thursday.
    Billal Rahman, MSNBC Newsweek, 22 Aug. 2025
Adjective
  • Chris McGrath/Getty Images Just imagine if the Russian leader were to announce not only a commitment to peace but also an unconditional pledge to return the 20,000 Ukrainian children his forces have illegally abducted since the full-scale invasion of February 2022.
    Irwin Redlener, MSNBC Newsweek, 21 Aug. 2025
  • Osborn sided with the remaining two factions, demanding immediate and unconditional emancipation and boycotting products from places that used slave labor.
    Doug Ross, Chicago Tribune, 20 Aug. 2025
Adjective
  • Three people are dead and nine others are injured after multiple shooters opened fire in a mass shooting at a New York City club, according to the New York City Police Department.
    Julia Gomez, USA Today, 18 Aug. 2025
  • As a result, three occupants of the minivan involved in the crash are dead, FLHSMV said in a press release.
    Elainie Barraza, The Orlando Sentinel, 17 Aug. 2025
Adverb
  • Twitch recently banned her, with people citing that cheating on stream is against its TOS, but then early today she was unbanned, making that duration incredibly short.
    Paul Tassi, Forbes.com, 12 Aug. 2025
  • However, Boone was incredibly complimentary of Rice’s catching skills on Monday and Tuesday.
    Gary Phillips, New York Daily News, 12 Aug. 2025

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Cite this Entry

“Deadly.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/deadly. Accessed 26 Aug. 2025.

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