Merriam-Webster's Word of the Day for December 15, 2024 is:

cavalier • \kav-uh-LEER\  • adjective

Someone described as cavalier shows no concern for important or serious matters. Cavalier also describes attitudes, manners, etc., that show the same lack of concern.

// The company provides regular training about the dangers of being cavalier in sharing privileged information.

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Examples:

“I’d failed math and chemistry the previous quarter; my European history teacher had decried—in front of the class—my ‘flippant and cavalier attitude.’ My GPA was a 1.8. But the night before the assignment was due I wrote a play about the thing that I—and Holden Caulfield—both passionately hated: The phoniness of organized structures, the way that religious belief was—in my fifteen-year-old mind—nothing but pretense and emptiness. … The next day, class began with a flourish. Ted Sod, the visiting playwright, stormed through the door. We’d all done good work, he told us, but one play—in particular—stood out. … And then, to my inestimable shock, he pointed at me.” — Pauls Toutonghi, LitHub.com, 5 Oct. 2023

Did you know?

Mount up, fellow language caballeros! We think you’ll agree that the origins of cavalier make a great deal of horse sense. The noun cavalier—which traces back to the Late Latin word caballārius, meaning “horseback rider,” and even further to the Latin word for “work horse,” caballus—originally referred to a gentleman or knight trained in arms and horsemanship. The adjective trotted into English just a few decades after the noun, first describing those thought to embody qualities of gallantry and suaveness associated with such soldiers. However, the English Puritans later applied the noun with disdain to their adversaries, the swashbuckling royalist followers of Charles I, who sported longish hair and swords. Their use undoubtedly contributed to the adjective’s “flippant” sense, which is now the most common. To saddle someone (or their behavior, attitude, etc.) with the descriptor today is to say that they do not demonstrate the expected or required care for serious matters.