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 But the trip is going to be an extreme test of fortitude, fate, and faith, evidenced by Lionsgate's preview revealing obstacles including a hellish radiation storm, monster waves, meteors pummeling the Earth, and lethal bands of desperate survivors prowling the continent. Jeff Spry, Space.com, 30 Sep. 2025 Dozens of federal law enforcement officers in tactical gear deployed non-lethal munitions while pushing back a crowd of protesters outside the facility Saturday evening. Bill Kirkos, CNN Money, 29 Sep. 2025 The left-wing ideology has now become as lethal as white supremacy. Boston Herald Editorial Staff, Boston Herald, 27 Sep. 2025 The violence so far has been less lethal than right-wing or jihadist terrorism that dominated past decades. Jasmine Baehr, FOXNews.com, 26 Sep. 2025 See All Example Sentences for lethal
Recent Examples of Synonyms for lethal
Adjective
  • During a three-day rampage of gang violence, some 80 people died — the deadliest days in El Salvador since its civil war.
    T. Christian Miller, ProPublica, 30 Sep. 2025
  • One Pasteurella-like microbe carried genetic hints of virulence and has ties to deadly outbreaks in modern African elephants.
    Pranjal Malewar, New Atlas, 30 Sep. 2025
Adjective
  • The crossover came amid recent turmoil, including Colbert’s show being canceled by in July and Kimmel's temporary suspension by ABC in September following controversial comments about the fatal shooting of political activist Charlie Kirk.
    Megan Cartwright, MSNBC Newsweek, 1 Oct. 2025
  • And one expert has suggested that steel or concrete barriers can also help guard against deadly attacks like the one in Grand Blanc Township, as well as unintentional fatal wrecks and may even help businesses stave off plaintiff lawsuits.
    Frank Witsil, Freep.com, 1 Oct. 2025
Adjective
  • Powell County paramedic Eddie Barnes and one of his team members were called to the Kentucky Reptile Zoo in May after the zoo’s co-director, James Harrison, was bitten by a poisonous mamba snake, local news outlet LEX 18 reported.
    Toria Sheffield, PEOPLE, 27 Sep. 2025
  • Rather than allowing herself to be captured by the Romans, legend has it that Cleopatra let a poisonous asp bite her in Alexandria, according to the documentary.
    Ashley Strickland, CNN Money, 26 Sep. 2025

Browse Nearby Words

Cite this Entry

“Lethal.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/lethal. Accessed 7 Oct. 2025.

More from Merriam-Webster on lethal

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!