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
Synonyms
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
Kasey Caminiti, USA TODAY, 29 Nov. 2024
Working from a script by Scott Silver, Phillips hedges his bet by recycling: Joaquin Phoenix refines his Oscar-winning turn as psychotic urban vigilante/revenge killer Arthur Fleck, this time revealing his insanity through pop songs.
—Armond White, National Review, 29 Nov. 2024
Whishaw makes Ben believable as an efficient killer but also a gentle, sad-eyed sweetheart who could really use a hug.
—Kristen Baldwin, EW.com, 28 Nov. 2024
Its second killer feature was full backward compatibility support for the original PlayStation.
—Yaakov Katz, Newsweek, 27 Nov. 2024
See all Example Sentences for killer 
Examples are automatically compiled from online sources to
show current usage.
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Opinions expressed in the examples do not represent those of Merriam-Webster or its editors.
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Noun
Amazon's Black Friday 2024 sale has some killer headphones and earbuds on sale, including the Apple AirPods Pro 2 for the lowest price ever.
—Kasey Caminiti, USA TODAY, 29 Nov. 2024
Working from a script by Scott Silver, Phillips hedges his bet by recycling: Joaquin Phoenix refines his Oscar-winning turn as psychotic urban vigilante/revenge killer Arthur Fleck, this time revealing his insanity through pop songs.
—Armond White, National Review, 29 Nov. 2024
Whishaw makes Ben believable as an efficient killer but also a gentle, sad-eyed sweetheart who could really use a hug.
—Kristen Baldwin, EW.com, 28 Nov. 2024
Its second killer feature was full backward compatibility support for the original PlayStation.
—Yaakov Katz, Newsweek, 27 Nov. 2024
See all Example Sentences for killer
Dictionary Entries Near killer
Cite this Entry
“Killer.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/killer. Accessed 14 Dec. 2024.
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