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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
The Sino-Indian border has seen periodic skirmishes for decades, including a deadly clash in the Galwan Valley along the Line of Actual Control (LAC) in June 2020. Micah McCartney, MSNBC Newsweek, 30 July 2025 The New York Police Department is sending investigators to Las Vegas to learn more about a possible motive for Monday’s deadly mass shooting in midtown Manhattan. Jade Walker, CNN Money, 30 July 2025
Adverb
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 While Alan Wake and Control aren’t themselves deadly serious, Firebreak hues much more heavily into broad comedy than the mainline Remedyverse titles. Christopher Cruz, Rolling Stone, 19 June 2025 See All Example Sentences for deadly
Recent Examples of Synonyms for deadly
Adjective
  • For its lethal injection, Florida uses a combination of a sedative, a paralytic and a drug that stops the heart, the outlet reported, citing the state Department of Corrections.
    Lesley Cosme Torres, People.com, 1 Aug. 2025
  • Zakrzewski is set to be executed by lethal injection at 6 p.m. ET on Thursday at the at Florida State Prison in Railford, about 45 miles southwest of Jacksonville.
    Amanda Lee Myers, USA Today, 31 July 2025
Adjective
  • Some deliver a sheer, just-back-from-vacation glow; others lean richer, with light-reflecting pigments and true bronze color payoff.
    Claire Sullivan, Footwear News, 1 Aug. 2025
  • We are wrapped in a mesmerizing combination of soft forest and sheer stone.
    Roger Naylor, AZCentral.com, 1 Aug. 2025
Adjective
  • One day, every century, Death takes on a mortal form and walks among humans, better to understand them.
    Christopher Rudolph, People.com, 24 July 2025
  • The occupants inside all three vehicles suffered mortal injuries and died at the scene, Hebler said.
    Caleb Lunetta, San Diego Union-Tribune, 23 July 2025
Adverb
  • It’s coated in a thin layer of real gold – not just to look fancy, but because gold reflects infrared light extremely well.
    Adi Foord, Space.com, 26 July 2025
  • The destination has an extremely low crime rate, no hurricanes in recent history and a strong health care system.
    Kathleen Wong, USA Today, 25 July 2025
Adjective
  • The 2024 case was not fatal, health department spokesperson Kimberly Harry indicated on July 28.
    Christina Hall, Freep.com, 29 July 2025
  • Simmons said very few improvements have been made to the highway, even as the fatal accidents continue to happen.
    Julie Gallant, San Diego Union-Tribune, 29 July 2025
Adjective
  • The pilot program will provide unconditional cash payments of $600 per month for 18 months to hundreds of pregnant women in their first or second trimesters, as well as $750 per month to 21-year-olds who have spent time in the foster care system.
    Hugh Cameron, MSNBC Newsweek, 29 July 2025
  • Ukraine demands an unconditional halt to fighting; Russia, on the other hand, refuses a ceasefire due its ability to press its current battlefield advantage and a benign stance from President Trump; although his position appears to have shifted somewhat against Russia recently.
    Katya Soldak, Forbes.com, 26 July 2025
Adjective
  • Paramedics tried to resuscitate her and rushed her to a nearby hospital, where she was pronounced dead.
    Victoria Moorwood, The Enquirer, 24 July 2025
  • He was treated by a rescue crew before being taken to the hospital, where he was pronounced dead.
    Abigail Lee, Variety, 24 July 2025
Adverb
  • For every high schooler, the college admissions process is incredibly daunting.
    Salman Chowdhury, CNBC, 31 July 2025
  • In March 2016, Justin told Vox that raising a feminist daughter – and feminist sons – was incredibly important to him.
    Stephanie Kaloi, People.com, 31 July 2025

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Cite this Entry

“Deadly.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/deadly. Accessed 6 Aug. 2025.

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