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
Synonyms
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
Zac Ntim, Deadline, 16 Feb. 2025
Based on true events, a thriller about a serial rapist and killer targeting women in Northern Spain during the Carlist Wars, 20 years before Jack the Ripper haunted the streets of London.
—Jamie Lang, Variety, 14 Feb. 2025
Successful record exec Dre (Taye Diggs) has everything going for him: a growing career, a gorgeous wife (Nicole Ari Parker), close friends, and killer good looks.
—James Mercadante, EW.com, 14 Feb. 2025
His characteristically sparse prose only makes this portrait of a necrophiliac serial killer haunting the hill country of eastern Tennessee that much more disturbing: Lester Ballard makes Norman Bates look like Beaver Cleaver.
—M.l. Rio, New York Times, 14 Feb. 2025
See all Example Sentences for killer 
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Noun
The story follows ex-addict Kirsty, played by Simone McIntyre, who risks her new life by re-entering the brutal world of heroin and prostitution, and unknowingly the stalking grounds of a serial killer, to save her best friend Becky, played by Bear Thompson.
—Zac Ntim, Deadline, 16 Feb. 2025
Based on true events, a thriller about a serial rapist and killer targeting women in Northern Spain during the Carlist Wars, 20 years before Jack the Ripper haunted the streets of London.
—Jamie Lang, Variety, 14 Feb. 2025
Successful record exec Dre (Taye Diggs) has everything going for him: a growing career, a gorgeous wife (Nicole Ari Parker), close friends, and killer good looks.
—James Mercadante, EW.com, 14 Feb. 2025
His characteristically sparse prose only makes this portrait of a necrophiliac serial killer haunting the hill country of eastern Tennessee that much more disturbing: Lester Ballard makes Norman Bates look like Beaver Cleaver.
—M.l. Rio, New York Times, 14 Feb. 2025
See all Example Sentences for killer
Dictionary Entries Near killer
Cite this Entry
“Killer.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/killer. Accessed 21 Feb. 2025.
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