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
Amanda Lee Myers, USA Today, 10 Dec. 2025
Rough House 16 MENTIONS ALTER by SK Dale In a secret military lab, a neuroscientist uses cutting-edge technology to rewire the mind of a psychopathic killer, forcing her own memories onto him in the hopes to trigger empathy.
—Christian Zilko, IndieWire, 9 Dec. 2025
Tom Holland and Dominic Sandbrook, hosts of The Rest is History podcast, will run through a list of suspects before revealing their theories related to the killer’s identity in the final episode, according to the outlet.
—Jenna Sundel, MSNBC Newsweek, 9 Dec. 2025
Notably, Jackson Kellard — the scribe behind the serial killer script Trace — placed for the fourth time this year after making the list in 2024 and placing with two scripts in 2023.
—Matt Grobar, Deadline, 9 Dec. 2025
See All Example Sentences for killer
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Noun
The state has another execution scheduled next week, serial killer Frank Athen Walls, for the double murder of a Florida couple in 1987.
—Amanda Lee Myers, USA Today, 10 Dec. 2025
Rough House 16 MENTIONS ALTER by SK Dale In a secret military lab, a neuroscientist uses cutting-edge technology to rewire the mind of a psychopathic killer, forcing her own memories onto him in the hopes to trigger empathy.
—Christian Zilko, IndieWire, 9 Dec. 2025
Tom Holland and Dominic Sandbrook, hosts of The Rest is History podcast, will run through a list of suspects before revealing their theories related to the killer’s identity in the final episode, according to the outlet.
—Jenna Sundel, MSNBC Newsweek, 9 Dec. 2025
Notably, Jackson Kellard — the scribe behind the serial killer script Trace — placed for the fourth time this year after making the list in 2024 and placing with two scripts in 2023.
—Matt Grobar, Deadline, 9 Dec. 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 11 Dec. 2025.
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