Synonyms
- affectless
- callous
- case-hardened
- cold-blooded
- compassionless
- desensitized
- hard
- hard-boiled
- hard-hearted
- heartless
- indurate
- inhuman
- inhumane
- insensate
- insensitive
- ironhearted
- obdurate
- pachydermatous
- pitiless
- remorseless
- ruthless
- slash-and-burn
- soulless
- stony
- stoney
- stonyhearted
- take-no-prisoners
- thick-skinned
- uncharitable
- unfeeling
- unmerciful
- unsparing
- unsympathetic
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
But in the face of an increasingly merciless healthcare system, the battered team must put aside their differences and pull together to save lives.
—
Jesse Whittock, Deadline, 25 June 2024
But when serious infection sets in, the most powerful antibiotics take a merciless approach, wiping out colonies of beneficial bacteria in the digestive tract and often prompting secondary health problems.
—Tribune News Service, The Mercury News, 20 June 2024
Children are also the victims of merciless speeding drivers.
—Voice Of The People, New York Daily News, 27 Apr. 2024
Realizing, after Russia’s inaction when Azerbaijan violated the cease-fire and embarked on its merciless plunder, Armenians have received signs of support at least in principle from countries such as France and the United States.
—Harry Mazadoorian, Hartford Courant, 18 Apr. 2024
See all Example Sentences for merciless 
Jesse Whittock, Deadline, 25 June 2024
But when serious infection sets in, the most powerful antibiotics take a merciless approach, wiping out colonies of beneficial bacteria in the digestive tract and often prompting secondary health problems.
—Tribune News Service, The Mercury News, 20 June 2024
Children are also the victims of merciless speeding drivers.
—Voice Of The People, New York Daily News, 27 Apr. 2024
Realizing, after Russia’s inaction when Azerbaijan violated the cease-fire and embarked on its merciless plunder, Armenians have received signs of support at least in principle from countries such as France and the United States.
—Harry Mazadoorian, Hartford Courant, 18 Apr. 2024
See all Example Sentences for merciless
These examples are programmatically compiled from various online sources to illustrate current usage of the word 'merciless.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.
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Cite this Entry
“Merciless.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/merciless. Accessed 2 Jul. 2024.
Copy CitationKids Definition
merciless
adjective
mer·ci·less
ˈmər-si-ləs 
: having no mercy : pitiless
merciless slaughter
mercilessly
adverb
mercilessness
noun
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