Merriam-Webster's Word of the Day for March 21, 2024 is:

scurrilous • \SKUR-uh-lus\  • adjective

Scurrilous is a formal adjective that most often describes language that contains obscenities, abuse, or, especially, slander—that is, a false statement that damages a person’s reputation. Scurrilous can also describe someone who uses or tends to use scurrilous language, or it can describe a person or thing as evil or vulgar.

// The press secretary made a point at the briefing not to address the scurrilous rumors surrounding the senator.

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Examples:

“There are many interesting and surprising details about ‘Jingle Bells’ known to few of the millions of people who happily sing the beloved song every December. For one, its author—a somewhat scurrilous fellow named James Lord Pierpont—was the uncle of the legendary Gilded Age banker J.P. Morgan (the P. is for Pierpont), who reportedly thought little of his songwriting relative, once calling him ‘Good for nothing.’” — David Templeton, The Argus-Courier (Petaluma, California), 18 Dec. 2023

Did you know?

Scurrilous (and its much rarer relation scurrile, which has the same meaning) comes from the Middle French word scurrile, which comes ultimately from the Latin noun scurra, meaning “buffoon” or “jester.” Fittingly, 18th-century lexicographer Samuel Johnson defined scurrilous as “using such language as only the licence of a buffoon could warrant.” Qualities traditionally associated with buffoonery—vulgarity, irreverence, and indecorousness—are qualities often invoked by the word scurrilous. Unlike the words of a jester, however, “scurrilous” language of the present day more often intends to seriously harm or slander someone than to produce a few laughs.