Definition of lethalnext

Synonym Chooser

How does the adjective lethal differ from other similar words?

Some common synonyms of lethal are deadly, fatal, and mortal. While all these words mean "causing or capable of causing death," lethal applies to something that is bound to cause death or exists for the destruction of life.

lethal gas

When is deadly a more appropriate choice than lethal?

The words deadly and lethal can be used in similar contexts, but deadly applies to an established or very likely cause of death.

a deadly disease

When could fatal be used to replace lethal?

Although the words fatal and lethal have much in common, fatal stresses the inevitability of what has in fact resulted in death or destruction.

fatal consequences

When might mortal be a better fit than lethal?

While in some cases nearly identical to lethal, 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 lethal Being outdoors for even a brief period of time can be lethal. Nicholas Williams, New York Daily News, 8 Feb. 2026 Prolonged skin damage greatly increases risks of bacterial infections that can quickly turn lethal. Andrew Paul, Popular Science, 5 Feb. 2026 Since then, the Islamic regime’s security forces have used extreme lethal force, including military-grade weapons, against unarmed protesters. Hamid Kashani, Twin Cities, 5 Feb. 2026 Like any lethal use of force incident involving law enforcement, there should be a thorough review of the facts. The Editorial Board, Oc Register, 5 Feb. 2026 See All Example Sentences for lethal
Recent Examples of Synonyms for lethal
Adjective
  • Administration public health officials often cite the need to restore trust in public health systems after the coronavirus pandemic, when vaccine policy and the general public health response to the deadly pandemic became a highly polarizing topic in American politics.
    Arkansas Online, Arkansas Online, 9 Feb. 2026
  • The Metropolitan Police Department made another arrest in connection with a deadly 2023 shooting outside a Northeast Washington nightclub that killed former Morgan State University basketball player Blake Bozeman and injured three others.
    7News WJLA, Baltimore Sun, 9 Feb. 2026
Adjective
  • Italy’s specialist mountain rescue organization revealed the fatal disasters were caused by weak layers of fresh snow, unstable enough that the passage of a single person could trigger an avalanche.
    Bonny Chu, FOXNews.com, 11 Feb. 2026
  • The fatal shootings and immigration agents' tactics in Minnesota have alienated a growing share of Americans and caused friction within the Republican Party.
    Kathryn Palmer, USA Today, 10 Feb. 2026
Adjective
  • Carbon monoxide is a colorless, odorless and tasteless poisonous gas that at high levels can cause loss of consciousness and death.
    Alexandra Koch, FOXNews.com, 5 Feb. 2026
  • Kirk recognized that this crude conspiracism was poisonous to his project of popularizing the conservative cause.
    Yair Rosenberg, The Atlantic, 4 Feb. 2026

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Cite this Entry

“Lethal.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/lethal. Accessed 14 Feb. 2026.

More from Merriam-Webster on lethal

Last Updated: - Updated example sentences
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