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
Rosy Cordero, Deadline, 22 June 2026
Sharako is all killer, no filler.
—Sean T. Collins, Vulture, 22 June 2026
Heat is often called a silent killer.
—Laura Paddison, CNN Money, 22 June 2026
Bill Skarsgård returns as Pennywise, Derry's resident killer clown, shapeshifter, and hallucination-manifesting cosmic monster.
—Matt Cabral, Entertainment Weekly, 22 June 2026
See All Example Sentences for killer
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Noun
Bishop follows homicide detective Bishop Graves (Joel Kinnaman) – brilliant, battle-scarred – will put all of his skills to the test in the hunt for an elusive killer targeting San Francisco’s moneyed class.
—Rosy Cordero, Deadline, 22 June 2026
Sharako is all killer, no filler.
—Sean T. Collins, Vulture, 22 June 2026
Heat is often called a silent killer.
—Laura Paddison, CNN Money, 22 June 2026
Bill Skarsgård returns as Pennywise, Derry's resident killer clown, shapeshifter, and hallucination-manifesting cosmic monster.
—Matt Cabral, Entertainment Weekly, 22 June 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 24 Jun. 2026.
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