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
Julia Black, Vanity Fair, 8 Feb. 2026
Much of the pressure comes from a killer interior line led by Milt Williams and Christian Barmore.
—Hank Gola, New York Daily News, 6 Feb. 2026
After a serial killer attacks a Florida State University sorority house leaving multiple sisters dead, the stakes have never been higher.
—Amanda Favazza, Southern Living, 6 Feb. 2026
Despite heart disease being the number one killer of American women, women are underrepresented in clinical trials.
—Helen Carefoot, Flow Space, 5 Feb. 2026
See All Example Sentences for killer
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Noun
Amazon pulled a similar trick, hiring Chris Hemsworth to imagine a series of dystopian scenarios in which his AI assistant turns into a sci-fi killer.
—Julia Black, Vanity Fair, 8 Feb. 2026
Much of the pressure comes from a killer interior line led by Milt Williams and Christian Barmore.
—Hank Gola, New York Daily News, 6 Feb. 2026
After a serial killer attacks a Florida State University sorority house leaving multiple sisters dead, the stakes have never been higher.
—Amanda Favazza, Southern Living, 6 Feb. 2026
Despite heart disease being the number one killer of American women, women are underrepresented in clinical trials.
—Helen Carefoot, Flow Space, 5 Feb. 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 14 Feb. 2026.
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