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
Martha McHardy, MSNBC Newsweek, 24 Sep. 2025
The controversy started last week when Kimmel said the MAGA movement was trying to score political points by saying that Kirk’s alleged killer was not one of its own.
—Ana Nicolaci Da Costa, CNN Money, 24 Sep. 2025
Kimmel once again broke out in tears when discussing Erika Kirk, the widow of Charlie Kirk, who forgave her husband’s killer at a memorial service on Sunday.
—Ethan Shanfeld, Variety, 24 Sep. 2025
Continue reading … GRACE OVER HATE – Erika Kirk's powerful act of forgiveness toward husband's killer stuns faith leaders.
—FOXNews.com, 24 Sep. 2025
See All Example Sentences for killer
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Opinions expressed in the examples do not represent those of Merriam-Webster or its editors.
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Noun
Following Kirk’s death, some speculated that his killer Tyler Robinson may have been exposed to these subcultures, but no credible evidence links him to the Groypers.
—Martha McHardy, MSNBC Newsweek, 24 Sep. 2025
The controversy started last week when Kimmel said the MAGA movement was trying to score political points by saying that Kirk’s alleged killer was not one of its own.
—Ana Nicolaci Da Costa, CNN Money, 24 Sep. 2025
Kimmel once again broke out in tears when discussing Erika Kirk, the widow of Charlie Kirk, who forgave her husband’s killer at a memorial service on Sunday.
—Ethan Shanfeld, Variety, 24 Sep. 2025
Continue reading … GRACE OVER HATE – Erika Kirk's powerful act of forgiveness toward husband's killer stuns faith leaders.
—FOXNews.com, 24 Sep. 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 29 Sep. 2025.
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