deadly 1 of 2

1
2
3

deadly

2 of 2

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
Florida recently recorded its first case of the highly infectious and potentially deadly disease this year. Tommy Tuberville, Newsweek, 6 Mar. 2025 Moreover, the destructive and deadly wildfires that swept through Los Angeles will impact both the revenue and spending sides of the state’s ledger, more than likely increasing the structural deficit. Dan Walters, The Mercury News, 6 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
  • Chris Wood is in lethal goalscoring form, while goalkeeper Matz Sels has notched 10 clean sheets this season — just one behind Liverpool’s record of 11.
    Julia Ranney, The Athletic, 25 Feb. 2025
  • The Minderoo Foundation, founded in 2001 and co-led by Forrest and his wife from whom he is separated, has come to fund everything from efforts to address lethal humidity to climate migration.
    Justin Worland, TIME, 25 Feb. 2025
Adjective
  • Yet the sheer number of the reversals reflect an administration moving much faster than usual.
    Brian Bennett, TIME, 27 Feb. 2025
  • As for throwback hits, Barbra Streisand’s sheer jumpsuit by Arnold Scaasi, worn in 1969, is proof that having fun on the carpet always wins, as does Salma Hayek’s Armani look in 1997, complete with a tiara.
    Christian Allaire, Vogue, 27 Feb. 2025
Adjective
  • The most devastating testimony came from Auschwitz survivors, one of whom described the mortal terror of people in the gas chambers, some taking 10 or more minutes to die, struggling frantically, their corpses covered in blood from their noses and ears.
    Gary J. Bass, New York Times, 22 Feb. 2025
  • And with that, the master of Tang Soo Do shuffles off this mortal coil!
    Ben Rosenstock, Vulture, 13 Feb. 2025
Adverb
  • And in a heartwarming turn of events, Wayans is extremely supportive of his child.
    Abby Monteil, Them, 3 Mar. 2025
  • The mesh fabric didn't cover as much as her extremely long, brown hair—a departure from the famous painting—which was stuffed into the dress and very deliberately situated for a wee bit of modesty.
    Marci Robin, Allure, 3 Mar. 2025
Adjective
  • However, this condition raises your risk of esophageal cancer, which can be fatal.
    Mark Gurarie, Health, 7 Mar. 2025
  • The sheriff's office said Tuesday that the company that provides natural gas service for the home made no significant findings after looking for gas leaks and carbon monoxide, the colorless, odorless gas that can be fatal by depriving people from getting enough oxygen.
    Alex Sundby, CBS News, 7 Mar. 2025
Adjective
  • Ariès argued that children didn’t emerge as a focus of unconditional love until the 17th century.
    Anna Mae Duane, The Conversation, 5 Mar. 2025
  • Vance informed Europe’s leaders that the days of unconditional American support were over.
    Dominic Green, Washington Examiner - Political News and Conservative Analysis About Congress, the President, and the Federal Government, 21 Feb. 2025
Adjective
  • Morgan and his three passengers, Ashley Nicole Caviness, 14; Danielle Nicole White, 13; and Brady Frizzell, 14, all of Humphrey, were pronounced dead at the scene.
    The Arkansas Democrat-Gazette, arkansasonline.com, 2 Mar. 2025
  • The injured man was transported to a nearby hospital where he was pronounced dead.
    Dan Perry, Newsweek, 2 Mar. 2025
Adverb
  • Of course, she felt vindicated, but learning what had been growing inside her body left her feeling incredibly overwhelmed.
    William Lambers, Newsweek, 9 Mar. 2025
  • Even if the projection is off by a wide margin, the cost to run a furnace in 2045 is going to be incredibly high compared with a heat pump.
    Ben Roush, Baltimore Sun, 9 Mar. 2025

Browse Nearby Words

Cite this Entry

“Deadly.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/deadly. Accessed 13 Mar. 2025.

More from Merriam-Webster on deadly

Last Updated: - Updated example sentences
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!