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
Darren Franich, Entertainment Weekly, 15 Mar. 2026
The greatest killer of American soldiers over the last 20 years has been Iran.
—NBC news, 15 Mar. 2026
Go to Kopitiam for Malaysian street-food and potent iced coffee in a bag, Golden Diner for a truly killer pancake, and Kiki’s for cozy Greek food.
—Wilder Davies, Bon Appetit Magazine, 14 Mar. 2026
Shittu’s killer ran off and remains at large.
—Nicholas Williams, New York Daily News, 14 Mar. 2026
See All Example Sentences for killer
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Noun
The actress completely transforms into serial killer Aileen Wuornos, delivering a tour de force as a woman struggling to suppress her violent urges.
—Darren Franich, Entertainment Weekly, 15 Mar. 2026
The greatest killer of American soldiers over the last 20 years has been Iran.
—NBC news, 15 Mar. 2026
Go to Kopitiam for Malaysian street-food and potent iced coffee in a bag, Golden Diner for a truly killer pancake, and Kiki’s for cozy Greek food.
—Wilder Davies, Bon Appetit Magazine, 14 Mar. 2026
Shittu’s killer ran off and remains at large.
—Nicholas Williams, New York Daily News, 14 Mar. 2026
See All Example Sentences for killer
Cite this Entry
“Killer.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/killer. Accessed 21 Mar. 2026.
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