Merriam-Webster's Word of the Day for December 29, 2025 is:

nefarious • \nih-FAIR-ee-us\  • adjective

Nefarious is a formal word that describes something as evil or immoral.

// Authorities suspect that the recovered materials were going to be used for nefarious purposes.

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Examples:

“Introducing characters like Gorilla Grodd on DC Crime would help familiarize audiences with these figures before they potentially receive an expanded role in another project. Perhaps each season could focus on a different villain, highlighting their nefarious actions.” — Chris Agar, comicbook.com, 16 Nov. 2025

Did you know?

If you need a fancy word to describe someone who’s up to no good, nefarious has got you (and them) covered. It’s also handy for characterizing the “no good” such a dastardly devil gets up to, as in “a nefarious business/plot/deed.” Nefarious is most often used for someone or something that is flagrantly wicked or corrupt—it’s more applicable to the mustache-twirling supervillain than the morally gray antihero. In other words, there’s no question that a nefarious scheme, or schemer, is not right. Etymologically, this makes perfect sense: nefarious can be traced back to the Latin noun nefas, meaning “crime,” which in turn combines ne- (“not”) and fas, meaning “right” or “divine law.” It is one of very few English words with this root, accompanied only by the likes of nefariousness and the thoroughly obscure nefast (“wicked”).

Merriam-Webster's Word of the Day for December 28, 2025 is:

yen • \YEN\  • noun

A yen is a strong desire, urge, or craving for something.

// After dinner, the family went out for ice cream to satisfy their yen for something sweet.

// Students with a yen to travel should consider studying abroad.

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Examples:

“If you’ve got a yen for succulent, right-off-the-boat Maine sea scallops, now is the time to get them.” — Stephen Rappaport, The Bangor Daily News, 26 Mar. 2025

Did you know?

Although yen suggests no more than a strong desire these days (as in “a yen for a beach vacation”), at one time someone with a yen was in deep trouble: the first meaning of yen, used in the late 19th century, was an intense craving for opium. The word comes from yīn-yáhn, a combination of yīn, meaning “opium,” and yáhn, “craving,” in the Chinese language used in the province of Guangdong. In English, the Chinese syllables were translated as yen-yen, and eventually shortened to yen.

Merriam-Webster's Word of the Day for December 27, 2025 is:

apropos • \ap-ruh-POH\  • preposition

Apropos is used as a preposition to mean "with regard to." It is frequently used in the phrase "apropos of."

// Sean interrupted our conversation about politics and, apropos of nothing, asked who we thought would win the basketball game.

As an adjective, apropos describes something that is suitable or appropriate, as in "an apropos nickname."

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Examples:

"Once, at the height of COVID, I dropped off a book at the home of Werner Herzog. I was an editor at the time and was trying to assign him a review, so I drove up to his gate in Laurel Canyon, and we had the briefest of masked conversations. Within 30 seconds, it turned strange. 'Do you have a dog? A little dog?' he asked me, staring out at the hills of Los Angeles, apropos of nothing. He didn't wait for an answer. 'Then be careful of the coyotes,' Herzog said." — Gal Beckerman, The Atlantic, 8 Jan. 2025

Did you know?

Apropos wears its ancestry like a badge—or perhaps more fittingly a beret. From the French phrase à propos, meaning "to the purpose," the word's emphasis lands on its last syllable, which ends in a silent "s": \ap-ruh-POH\. Apropos typically functions as an adjective describing what is suitable or appropriate ("an apropos comment"), or as a preposition (with or without of) meaning "with regard to," as in "apropos (of) the decision, implementation will take some time." The phrase "apropos of nothing" is used to signal that what follows does not relate to any previous topic.