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 The smaller bombs, which at night can resemble orange fireballs, are difficult to intercept and have proven lethal. Emma Bussey, FOXNews.com, 11 Mar. 2026 However, some police agencies began invoking Marsy’s Law for officers who used lethal force in the field, under the idea that the officers were victims, as well. Gabriel Velasquez Neira, Sun Sentinel, 11 Mar. 2026 The smaller bombs, which at night can resemble orange fireballs, are difficult to intercept and have proven lethal. Melanie Lidman, Chicago Tribune, 10 Mar. 2026 The result is poor drainage, which is lethal for most plants. David Beaulieu, The Spruce, 10 Mar. 2026 See All Example Sentences for lethal
Recent Examples of Synonyms for lethal
Adjective
  • Dan Morrison Eleven different countries have asked Ukraine for help in countering Iran's deadly Shahed drones, with request for interceptors, electronic warfare systems and training, Ukrainian Presiden Volodymyr Zelenskyy said Monday.
    Thao Nguyen, USA Today, 10 Mar. 2026
  • Yet Aster diagnoses them, and everyone else, with a deadly case of social media brain rot.
    Amy Nicholson, Los Angeles Times, 10 Mar. 2026
Adjective
  • The man’s death marks Kansas City’s 24th homicide of 2026, compared to 26 at this time last year, according to data tracked by The Star, which includes fatal police shootings.
    Caroline Zimmerman, Kansas City Star, 11 Mar. 2026
  • According to the city's police department, the fatal accident occurred at 1990 S Flamingo Road.
    Ana Maria Soler, CBS News, 10 Mar. 2026
Adjective
  • Some are edible, some are medicinal, some are poisonous, all are beautiful.
    Carl R. Gold, Baltimore Sun, 7 Mar. 2026
  • This version is set in a seemingly poisonous, post-nuclear wasteland, filled with flaming tree trunks.
    Vince Aletti, New Yorker, 6 Mar. 2026

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Cite this Entry

“Lethal.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/lethal. Accessed 15 Mar. 2026.

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