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 In This Poison Heart, Briseis already struggles with controlling her unique, yet lethal command over plants. Brittany Johnson, PEOPLE, 2 Nov. 2025 Los Angeles Police Department’s Central Division announced early Sunday that less-lethal munitions and tear gas had been authorized around Olympic Boulevard and Grand Avenue. Stephen Sorace, FOXNews.com, 2 Nov. 2025 Wuornos, who was found guilty of six murders and received six death sentences, was executed by lethal injection on October 9, 2002, after a decade on death row. Jason Pham, StyleCaster, 31 Oct. 2025 Wuornos was executed by lethal injection in October 2002, according to a New York Times obituary. Allison Degrushe, Entertainment Weekly, 31 Oct. 2025 See All Example Sentences for lethal
Recent Examples of Synonyms for lethal
Adjective
  • The section of the Guadalupe River where the camp is located has long been prone to deadly flash flooding.
    Shambhavi Rimal, Fort Worth Star-Telegram, 12 Nov. 2025
  • The deadliest assault on a school occurred in 2014 when Taliban gunmen killed 154 people, mostly children, at an army-run school in Peshawar.
    NPR, NPR, 11 Nov. 2025
Adjective
  • Yet a drumbeat of Mamdani’s past statements about Israel did not prove politically fatal in New York City in 2025.
    Philip Elliott, Time, 5 Nov. 2025
  • The special explores theories about why the thieves targeted specific displays, who orchestrated this brazen operation and which fatal flaws in their plan ultimately led to their capture.
    Peter White, Deadline, 5 Nov. 2025
Adjective
  • For all their sophistication—transforming a poisonous root and its leaves into a whole range of delicacies is no mean feat—for years such dishes were seen by the city’s elite as the food of poverty.
    Michael Snyder, Travel + Leisure, 5 Nov. 2025
  • By appointing a man who was deeply unpopular with fans by the end of his reign so recently, though, Wolves would have been condemning him and his players to working in a poisonous environment from day one.
    Steve Madeley, New York Times, 3 Nov. 2025

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Cite this Entry

“Lethal.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/lethal. Accessed 13 Nov. 2025.

More from Merriam-Webster on lethal

Last Updated: - Updated example sentences
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