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
Mike Barnes, HollywoodReporter, 4 Apr. 2025
There’s no doubt that the public has a fascination with serial killers.
—Lissete Lanuza Sáenz, StyleCaster, 4 Apr. 2025
Spot Treat with Herbicide Applying a weed killer is an option, if other methods don't work.
—Lauren David, Better Homes & Gardens, 2 Apr. 2025
Schepers stopped somewhere on her drive home or met someone (possibly crossing paths with a killer).
—Saleen Martin, USA Today, 2 Apr. 2025
See All Example Sentences for killer
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Noun
Robert Trebor, who portrayed the serial killer known as the Son of Sam in a CBS telefilm and the scheming merchant Salmoneus on Hercules: The Legendary Journeys and its sister series, Xena: Warrior Princess, has died.
—Mike Barnes, HollywoodReporter, 4 Apr. 2025
There’s no doubt that the public has a fascination with serial killers.
—Lissete Lanuza Sáenz, StyleCaster, 4 Apr. 2025
Spot Treat with Herbicide Applying a weed killer is an option, if other methods don't work.
—Lauren David, Better Homes & Gardens, 2 Apr. 2025
Schepers stopped somewhere on her drive home or met someone (possibly crossing paths with a killer).
—Saleen Martin, USA Today, 2 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 13 Apr. 2025.
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