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.
Following the deaths of his brother William (Felix Kammerer) and his sister-in-law Elizabeth (Mia Goth), Victor vows vengeance on the Creature and dedicates the rest of his life to a merciless pursuit of him. Yasmeen Hamadeh, PEOPLE, 7 Nov. 2025 The book, which is from Australia, follows Bee and her fellow runaways, who discover a new friend, Paco, is a Lost Boy from Neverland who needs them to fight hordes of pirates led by a merciless new leader. Jesse Whittock, Deadline, 4 Nov. 2025 The 9-0 Hoosiers are just merciless. Stewart Mandel, New York Times, 2 Nov. 2025 Patrick Stewart, of all people, is an all-time villain as the skinheads' calculating leader, issuing merciless orders in the same reasonable cadence we've been conditioned to trust implicitly. Dennis Perkins, Entertainment Weekly, 31 Oct. 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

Browse Nearby Words

Cite this Entry

“Merciless.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/merciless. Accessed 10 Nov. 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
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!