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
Stephen Schaefer, Boston Herald, 29 Mar. 2026
The Anya Taylor-Joy to Princess Peach style pipeline has found a natural meeting point in these femme and fun looks—but breaking for some killer vintage JPG felt right for the Suzuka paddock.
—Anna Cafolla, Vogue, 29 Mar. 2026
Alleged serial killer Rex Heuermann is expected to plead guilty at an April 8 court appearance, and admit to killing women and dumping their bodies near Gilgo Beach along with other locations on Long Island, according to a source familiar with the case.
—Colin Mixson, New York Daily News, 27 Mar. 2026
The film will chart the pursuit and capture of one of America’s most ruthless mobsters and serial killers by notorious DEA Agent Jim Hunt (who also helped take down El Chapo) played by Paul Walter Hauser (Black Bird).
—Andreas Wiseman, Deadline, 27 Mar. 2026
See All Example Sentences for killer
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Noun
That’s the promise with a story from the filmmaker and a killer cast led by Emily Blunt, Colman Domingo, Colin Firth, Josh O’Connor, Eve Hewson and Wyatt Russell.
—Stephen Schaefer, Boston Herald, 29 Mar. 2026
The Anya Taylor-Joy to Princess Peach style pipeline has found a natural meeting point in these femme and fun looks—but breaking for some killer vintage JPG felt right for the Suzuka paddock.
—Anna Cafolla, Vogue, 29 Mar. 2026
Alleged serial killer Rex Heuermann is expected to plead guilty at an April 8 court appearance, and admit to killing women and dumping their bodies near Gilgo Beach along with other locations on Long Island, according to a source familiar with the case.
—Colin Mixson, New York Daily News, 27 Mar. 2026
The film will chart the pursuit and capture of one of America’s most ruthless mobsters and serial killers by notorious DEA Agent Jim Hunt (who also helped take down El Chapo) played by Paul Walter Hauser (Black Bird).
—Andreas Wiseman, Deadline, 27 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 30 Mar. 2026.
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