mortal enemy
noun
: someone one hates very much and for a long time
They've been mortal enemies for many years.
Examples of mortal enemy in a Sentence
Recent Examples on the Web
And as Berend insinuates himself ever deeper into his life, Andor identifies him as a mortal enemy, not knowing that there is much — much — more to this story than first meets his eye.
—
Damon Wise, Deadline, 28 Aug. 2025
Tens of millions of Russians, including senior officials and many of the country’s wealthiest people, now view the West as a mortal enemy.
—Alexander Gabuev, Foreign Affairs, 17 Apr. 2025
While Cheeto treats the fabric feline like a mortal enemy, Romeow lounges on the counter, casting the occasional glance but remaining perfectly calm.
—Daniel R. Depetris, Newsweek, 10 Jan. 2025
Unlike Gi-hun, the audience is in on the secret that Player 001 is actually a mortal enemy.
—Patrick Brzeski, The Hollywood Reporter, 26 Dec. 2024
Not your best friend, your mortal enemy, Ran Carthon and Amy Adams Strunk or either of the Mike Myers characters on my wall.
—Nick Suss, The Tennessean, 20 Dec. 2024
Yeah, that's Ross's daughter, making Bruce Banner Ross's mortal enemy and father-in-law.
—Meredith G. White, The Arizona Republic, 12 July 2024
Check out our new ghost-pepper chip that’s better than the one made by our new mortal enemy, Trader Joe’s!
—Brandon Follick, The New Yorker, 27 June 2024
Examples are automatically compiled from online sources to
show current usage.
Read More
Opinions expressed in the examples do not represent those of Merriam-Webster or its editors.
Send us feedback.
Damon Wise, Deadline, 28 Aug. 2025
Tens of millions of Russians, including senior officials and many of the country’s wealthiest people, now view the West as a mortal enemy.
—Alexander Gabuev, Foreign Affairs, 17 Apr. 2025
While Cheeto treats the fabric feline like a mortal enemy, Romeow lounges on the counter, casting the occasional glance but remaining perfectly calm.
—Daniel R. Depetris, Newsweek, 10 Jan. 2025
Unlike Gi-hun, the audience is in on the secret that Player 001 is actually a mortal enemy.
—Patrick Brzeski, The Hollywood Reporter, 26 Dec. 2024
Not your best friend, your mortal enemy, Ran Carthon and Amy Adams Strunk or either of the Mike Myers characters on my wall.
—Nick Suss, The Tennessean, 20 Dec. 2024
Yeah, that's Ross's daughter, making Bruce Banner Ross's mortal enemy and father-in-law.
—Meredith G. White, The Arizona Republic, 12 July 2024
Check out our new ghost-pepper chip that’s better than the one made by our new mortal enemy, Trader Joe’s!
—Brandon Follick, The New Yorker, 27 June 2024
Cite this Entry
“Mortal enemy.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/mortal%20enemy. Accessed 10 Sep. 2025.
Copy CitationLove words? Need even more definitions?
Merriam-Webster unabridged
Share