merciless

adjective

mer·​ci·​less ˈmər-si-ləs How to pronounce merciless (audio)
: having or showing no mercy : pitiless
the merciless killing of innocent people
mercilessly adverb
mercilessness noun

Examples of merciless in a Sentence

the merciless killing of innocent people He has been merciless in his criticism of his opponent.
Recent Examples on the Web
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.
Inspired by Lauren’s late mother, Adele, who was diagnosed with early-onset Alzheimer’s at the age of 55, their family knows that this merciless disease is no laughing matter. Jeff Conway, Forbes.com, 17 Apr. 2025 Lottie proposes that Natalie be stripped of her title and that the merciless and vicious Shauna should lead them instead. Erin Qualey, Vulture, 14 Mar. 2025 The animal is fully present, merciless and hungry. Sara Holdren, Vulture, 11 Mar. 2025 In the series' latest episode, released March 9, Alex arrives to Ellis Island after a treacherous few weeks at sea, only to be put through even more turmoil as she's subjected to a series of invasive medical examinations by three merciless male doctors. Julia Moore, People.com, 10 Mar. 2025 See All Example Sentences for merciless

Word History

First Known Use

14th century, in the meaning defined above

Time Traveler
The first known use of merciless was in the 14th century

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Cite this Entry

“Merciless.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/merciless. Accessed 23 Apr. 2025.

Kids Definition

merciless

adjective
mer·​ci·​less ˈmər-si-ləs How to pronounce merciless (audio)
: having no mercy : pitiless
merciless slaughter
mercilessly adverb
mercilessness noun

More from Merriam-Webster on merciless

Last Updated: - Updated example sentences
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