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
Amy Nicholson, Los Angeles Times, 19 May 2026
In an era where picking apart golf courses, even major championship ones, with a flavor of violence has become the expectation, there was a welcome shock factor seeing a someone like Aaron Rai emerge from the pack of certified killers to get his hands on the Wanamaker Trophy.
—Mark Harris Outkick, FOXNews.com, 18 May 2026
Shortly after Lennon was shot, his killer, Mark David Chapman, confessed at the scene of the crime.
—Virginia Chamlee, PEOPLE, 18 May 2026
The resulting feature is enigmatic and lightly campy, strange and hallucinatory, taking place in a liminal futuristic city that’s clogged with thick mist and terrorized by a violent serial killer named Leather Man.
—Rachel Handler, Vulture, 18 May 2026
See All Example Sentences for killer
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Noun
Down below, an Army private (Charles Melton) hunts the killer.
—Amy Nicholson, Los Angeles Times, 19 May 2026
In an era where picking apart golf courses, even major championship ones, with a flavor of violence has become the expectation, there was a welcome shock factor seeing a someone like Aaron Rai emerge from the pack of certified killers to get his hands on the Wanamaker Trophy.
—Mark Harris Outkick, FOXNews.com, 18 May 2026
Shortly after Lennon was shot, his killer, Mark David Chapman, confessed at the scene of the crime.
—Virginia Chamlee, PEOPLE, 18 May 2026
The resulting feature is enigmatic and lightly campy, strange and hallucinatory, taking place in a liminal futuristic city that’s clogged with thick mist and terrorized by a violent serial killer named Leather Man.
—Rachel Handler, Vulture, 18 May 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 20 May. 2026.
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