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
Emma Specter, Vogue, 12 Nov. 2025
The state maintains that Tremane Wood was the killer and deserves to die.
—Amanda Lee Myers, USA Today, 12 Nov. 2025
Her death marks the first of a series that haunts Hawkins, leading police (without David Harbour’s Chief Jim Hopper) to deduce that a serial killer is on the loose and that Eddie Munson might be that killer.
—Dessi Gomez, Deadline, 12 Nov. 2025
As The Chair Company introduces a killer ensemble of uniquely insane characters, this late-capitalist discontent is always simmering under the surface.
—Miles Klee, Rolling Stone, 12 Nov. 2025
See All Example Sentences for killer
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Noun
Okay, puns aside, Markle actually gets to flex her range here while embodying an innocent-seeming killer.
—Emma Specter, Vogue, 12 Nov. 2025
The state maintains that Tremane Wood was the killer and deserves to die.
—Amanda Lee Myers, USA Today, 12 Nov. 2025
Her death marks the first of a series that haunts Hawkins, leading police (without David Harbour’s Chief Jim Hopper) to deduce that a serial killer is on the loose and that Eddie Munson might be that killer.
—Dessi Gomez, Deadline, 12 Nov. 2025
As The Chair Company introduces a killer ensemble of uniquely insane characters, this late-capitalist discontent is always simmering under the surface.
—Miles Klee, Rolling Stone, 12 Nov. 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 16 Nov. 2025.
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