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
Brian Hiatt, Rolling Stone, 1 Feb. 2026
Suzuki usually only goes out if one of the regular penalty-killers is in the box.
—Arpon Basu, New York Times, 1 Feb. 2026
Curry, the acclaimed actor known for his roles in The Rocky Horror Picture Show and It, played serial killer and rapist Billy Flynn in the fifth and sixth seasons of the show.
—Raven Brunner, PEOPLE, 31 Jan. 2026
In 2013, Skakel walked out of prison as a free man and later saw his conviction vacated in a move that further deepened the mystery of who Moxley’s true killer is.
—Julia Bonavita, FOXNews.com, 31 Jan. 2026
See All Example Sentences for killer
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Noun
The lyrics went beyond Evers’ white-supremacist killer, indicting an entire system that brainwashed poor white Southerners into hatred.
—Brian Hiatt, Rolling Stone, 1 Feb. 2026
Suzuki usually only goes out if one of the regular penalty-killers is in the box.
—Arpon Basu, New York Times, 1 Feb. 2026
Curry, the acclaimed actor known for his roles in The Rocky Horror Picture Show and It, played serial killer and rapist Billy Flynn in the fifth and sixth seasons of the show.
—Raven Brunner, PEOPLE, 31 Jan. 2026
In 2013, Skakel walked out of prison as a free man and later saw his conviction vacated in a move that further deepened the mystery of who Moxley’s true killer is.
—Julia Bonavita, FOXNews.com, 31 Jan. 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 4 Feb. 2026.
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