1
: one that kills
2
3
a
: one that has a forceful, violent, or striking impact
b
: one that is extremely difficult to deal with
1
: strikingly impressive or effective
a killer smile
a killer résumé
2
: extremely difficult to deal with
a killer fastball
also
: causing death or devastation
a killer tornado
Examples of killer in a Sentence
Noun
Heart disease is the leading killer of both men and women.
The chemical is used as a weed killer.
Adjective
killer viruses that claimed millions of lives
a killer exercise program guaranteed to whip you into shape
Recent Examples on the Web
Helen Shaw, New Yorker, 17 Apr. 2025
Rachel’s mother Patty Morin drew an implicit parallel between her daughter’s killer and Abrego Garcia at her White House appearance, even though the latter has never been charged with a crime.
—Niall Stanage, The Hill, 17 Apr. 2025
Too little moisture, and there might be no botrytis activity of any kind; too much, and the collaborator becomes a killer.
—Saveur Editors, Saveur, 16 Apr. 2025
Detective Murphy is spooked by a theory but is determined to find all the pieces to figure out how to end the carnage of this notorious serial killer in hopes of saving another life.
—Zac Ntim, Deadline, 15 Apr. 2025
See All Example Sentences for killer
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Noun
Moat did attract a sick fandom, but that sort of ugly love does not stay a killer’s hand.
—Helen Shaw, New Yorker, 17 Apr. 2025
Rachel’s mother Patty Morin drew an implicit parallel between her daughter’s killer and Abrego Garcia at her White House appearance, even though the latter has never been charged with a crime.
—Niall Stanage, The Hill, 17 Apr. 2025
Too little moisture, and there might be no botrytis activity of any kind; too much, and the collaborator becomes a killer.
—Saveur Editors, Saveur, 16 Apr. 2025
Detective Murphy is spooked by a theory but is determined to find all the pieces to figure out how to end the carnage of this notorious serial killer in hopes of saving another life.
—Zac Ntim, Deadline, 15 Apr. 2025
See All Example Sentences for killer
Cite this Entry
“Killer.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/killer. Accessed 26 Apr. 2025.
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