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
Simon Hill, Wired News, 10 July 2025
The original Dexter series — which followed Dexter Morgan (Hall), a vigilante serial killer who uses skills as a forensic technician with the Miami Metro Police Department to meticulously rid society of heinous criminals — ran from 2006 to 2013.
—Tim Lammers, Forbes.com, 10 July 2025
The slasher universe began its feature journey in 2016 with Terrifier, but its leading serial killer appeared in several of Leone’s short films dating back to 2008.
—Abbey White, HollywoodReporter, 10 July 2025
For now, at least, the answer is given clarity in the form of a curiosity-spiking club for serial killers.
—Ben Travers, IndieWire, 10 July 2025
See All Example Sentences for killer
Examples are automatically compiled from online sources to
show current usage.
Read More
Opinions expressed in the examples do not represent those of Merriam-Webster or its editors.
Send us feedback.
Noun
Meanwhile, the standard Amp offers AirPlay while the Pro doesn’t, adding to its cascade of streaming options, HDMI ARC support, and a potent power supply for a killer A/V entry point.
—Simon Hill, Wired News, 10 July 2025
The original Dexter series — which followed Dexter Morgan (Hall), a vigilante serial killer who uses skills as a forensic technician with the Miami Metro Police Department to meticulously rid society of heinous criminals — ran from 2006 to 2013.
—Tim Lammers, Forbes.com, 10 July 2025
The slasher universe began its feature journey in 2016 with Terrifier, but its leading serial killer appeared in several of Leone’s short films dating back to 2008.
—Abbey White, HollywoodReporter, 10 July 2025
For now, at least, the answer is given clarity in the form of a curiosity-spiking club for serial killers.
—Ben Travers, IndieWire, 10 July 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 14 Jul. 2025.
Copy CitationLove words? Need even more definitions?
Merriam-Webster unabridged
Share