Merriam-Webster's Word of the Day for March 18, 2026 is:

jejune • \jih-JOON\  • adjective

Jejune is a formal word that means "uninteresting" or "boring." It is also used as a synonym of juvenile to describe things (such as behaviors, attitudes, etc.) that are immature, childish, or simplistic.

// The movie adaptation employed surreal visual effects to tell the story, making the plot, jejune in the novel, archetypal rather than artless.

// The professor made rude and jejune remarks about the students' artwork.

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Examples:

"While [author Helen] Garner has journaled most of her life, she burned her early diaries in a bonfire having deemed them too embarrassing or jejune." — The Irish Times, 29 Mar. 2025

Did you know?

Starved for excitement? You won't get it from something jejune. The term comes to us from the Latin word jejunus, which means "empty of food," "hungry," or "meager." When English speakers first used jejune back in the 1600s, they applied it in ways that mirrored the meaning of its Latin parent, lamenting "jejune appetites" and "jejune morsels." Something that is meager rarely satisfies, and before long jejune was being used not only for meager meals or hunger, but also for things lacking in intellectual or emotional substance. It's possible that the word gained its now-popular "juvenile" or "childish" sense when people confused it with the look-alike French word jeune, which means "young."

Merriam-Webster's Word of the Day for March 17, 2026 is:

Erin go bragh • \air-un-guh-BRAW\  • phrase

Erin go bragh is an Irish phrase that means “Ireland forever.”

// They proudly waved the Irish flag during the parade, shouting “Erin go bragh!”

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Examples:

“Dressed in full Irish regalia, Fitzgerald rode his horse, Jack, through the streets of Clinton every St. Patrick’s Day. Jack was also dressed for the occasion, with green ribbons on his mane and a green blanket with gold lettering, ‘Erin Go Bragh.’” — Craig S. Semon, The Worcester (Massachusetts) Telegram & Gazette, 22 Dec. 2025

Did you know?

March 17th is the feast day of the patron saint of Ireland, St. Patrick. In the United States, it is also the day of shamrocks, leprechauns, and green beer (and green everything else). Blue was once the color traditionally associated with St. Patrick, but the color green has several links to Ireland, including its use on Ireland’s flag in the form of a stripe, its symbolism of Irish nationalism and the country’s religious history, and its connection to Ireland’s nickname, The Emerald Isle. On St. Patrick’s Day, people turn to their dictionary to look up Erin go bragh, which means “Ireland forever.” The original Irish phrase was Erin go brách (or go bráth), which translates literally as “Ireland till doomsday.” It’s an expression of loyalty and devotion that first appeared in English during the late 18th-century Irish rebellion against the British.

Merriam-Webster's Word of the Day for March 16, 2026 is:

putative • \PYOO-tuh-tiv\  • adjective

Putative is a formal word used to describe something that is generally believed, supposed, or assumed to be something specified. It is always used before a noun.

// The group's putative leader was conspicuously absent from the meeting.

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Examples:

"... the painting is swept up in questions of identity, provenance, authenticity and putative value." — Manohla Dargis, The New York Times, 31 Oct. 2025

Did you know?

There's no need to make assumptions about the root behind putative—we know it comes from a form of the Latin verb putare, which means "to consider" or "to think." Putative is a rather formal word that has been part of English since the 15th century. Like apparent, presumed, and ostensible, it leaves room for a smidgen of doubt: a putative ally will very probably be there for you, and a putative successor is very likely to be the next one in charge, but life offers no guarantees in either case.

Merriam-Webster's Word of the Day for March 15, 2026 is:

tranche • \TRAHNSH\  • noun

Tranche refers to a division or portion of a whole.

// A tranche of leaked documents was delivered to the newspaper anonymously, with more promised to come.

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Examples:

“Congress approved an initial tranche of funding legislation in November as the longest shutdown in history came to an end.” — Kaia Hubbard, CBS News, 16 Dec. 2025

Did you know?

In French, tranche means “slice.” Cutting deeper into the word’s etymology, we find the Old French word trenchier, meaning “to cut,” which has its likely origin in a Latin word meaning “to cut in three,” from Latin trini meaning “three each.” Tranche emerged in the English language in the late 19th century to refer to a division or portion of a larger pool or whole, and later developed a finance-specific meaning referring to an offering for sale of typically a set of bonds “cut” from a larger group of bonds, the tranche being differentiated by such factors as maturity or rate of return.

Merriam-Webster's Word of the Day for March 14, 2026 is:

rash • \RASH\  • adjective

Rash describes something done or made quickly and without thought about what will happen as a result. It can also describe someone who is doing something rash.

// I later regretted having made such a rash promise in a moment of chaos.

// Don't be rash about this decision. Take your time.

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Examples:

“The climactic scenes toy with the blurred lines between hallucination and reality, but the logic falls apart; threads like Hana’s rash decision to undertake a dangerous surgical fix virtually evaporate without much payoff.” — David Rooney, The Hollywood Reporter, 3 Feb. 2026

Did you know?

Is it possible that the origins of the noun rash (referring to a group of red spots on the skin that is caused by an illness or a reaction to something) and the adjective rash (meaning “overly hasty”) are the same? Not so fast! Like many homonyms—“two or more words spelled and pronounced alike but different in meaning”—the two rashes have distinct sources. The noun rash, which first appeared in English in the late 17th century, probably comes ultimately from the Latin verb rādere, meaning “to scrape, scratch, shave.” The adjective rash appears to be about two centuries older, and comes from a Middle English word rasch meaning “active, quick, eager.”