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
Peter Van Sant, CBS News, 12 Apr. 2026
Faces of Death director Daniel Goldhaber, who also co-wrote the film with Isa Mazzei, says that this overlap in Montgomery and his on-screen killer helped to carve out the character’s final form.
—Bailey Richards, PEOPLE, 12 Apr. 2026
Cory Monteith had made headway in bit parts and supporting roles when Ryan Murphy plucked him from near obscurity to portray Finn Hudson, the high school quarterback with a softer side and a killer set of pipes.
—James Mercadante, Entertainment Weekly, 11 Apr. 2026
The horrific discovery spurred a wider search on Long Island over the following year – nearly a dozen bodies were found in all – and raised fears of a serial killer on the loose.
—Eric Levenson, CNN Money, 11 Apr. 2026
See All Example Sentences for killer
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Noun
That moment, over a quarter of a century in the making, came in December 2025 when Tiffani McInnis—flanked by supporters—faced her mother's killer in a courtroom.
—Peter Van Sant, CBS News, 12 Apr. 2026
Faces of Death director Daniel Goldhaber, who also co-wrote the film with Isa Mazzei, says that this overlap in Montgomery and his on-screen killer helped to carve out the character’s final form.
—Bailey Richards, PEOPLE, 12 Apr. 2026
Cory Monteith had made headway in bit parts and supporting roles when Ryan Murphy plucked him from near obscurity to portray Finn Hudson, the high school quarterback with a softer side and a killer set of pipes.
—James Mercadante, Entertainment Weekly, 11 Apr. 2026
The horrific discovery spurred a wider search on Long Island over the following year – nearly a dozen bodies were found in all – and raised fears of a serial killer on the loose.
—Eric Levenson, CNN Money, 11 Apr. 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 15 Apr. 2026.
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