The noun colloquy was first used in English to refer to a conversation or dialogue, and when the adjective colloquial was formed from colloquy it had a similar focus. Over time, however, colloquial developed a more specific meaning related to language that is most suited to informal conversation—and it ultimately garnered an additional, disparaging implication of a style that seems too informal for a situation. Colloquy and colloquial trace back to the Latin verb colloqui, meaning "to converse." Colloqui in turn was formed by combining the prefix com- ("with") and loqui ("to speak"). Other conversational descendants of loqui in English include circumlocution, eloquent, loquacious, soliloquy, and ventriloquism.
But I think part of this pickle that we're in—if I may be colloquial, even though I'm not running for office—is that we've lost their sense of responsibility. Sarah Vowell, Entertainment Weekly, 24 Oct. 2008Langston was the merriest and the most colloquial of them all. "Best party I've ever been given!" he said. Gwendolyn Brooks, Booklist, 15 Oct. 1993Mr. Salisbury's firsthand account is written in a fast-paced, chaotic and colloquial style, which often feels confused and hastily set down. Susan Shapiro, New York Times Book Review, 10 Sept. 1989Although in the circle of his friends, where he might be unreserved with safety, he took a free share in conversation, his colloquial talents were not above mediocrity, possessing neither copiousness of ideas, nor fluency of words. Thomas Jefferson, letter, 2 Jan. 1814 the new coworker's rudeness soon began—to use a colloquial expression—to rub me the wrong way a colloquial essay on what makes a marriage successful See More
Recent Examples on the WebObaseki is a tall, elegant man who shifts deftly from the Edo language to formal English or colloquial speech. David Frum, The Atlantic, 14 Sep. 2022 Even without consulting the dinosaur expert who kindly indulged our call, people online have landed on the geologic term that emotionally aligns with its colloquial use. Jessica M. Goldstein, Washington Post, 22 Aug. 2022 In both cases, the apparent intention was to refer to someone who appears to be out of control/not able to control their actions, employing it as colloquial slang that has long been used as a playground taunt. Gil Kaufman, Billboard, 4 Aug. 2022 Dury’s mastery of colloquial speech drew a detailed picture of English class experience and unbridled thinking. Armond White, National Review, 3 Aug. 2022 The screenplay, by Matt Lopez, leans bright and broad, but there are sweetly specific moments scattered throughout, from a whisper-fight over dominoes at the local social club to the frequent snatches of colloquial Spanish woven into the dialogue. Leah Greenblatt, EW.com, 15 June 2022 Unlike the ornate storytelling on El Mal Querer, which was inspired by a 13th-century Occitan novel, a lot of her new song lyrics are loud flexes and much more colloquial. Julyssa Lopez, Rolling Stone, 18 Mar. 2022 There is even a name for them: zama zamas, a Zulu colloquial term meaning to persevere, to keep at it.Los Angeles Times, 9 Aug. 2022 This is true, not in the colloquial sense but in the literal sense: rocket science is a domain in which Musk has demonstrated some expertise. Andrew Marantz, The New Yorker, 27 Apr. 2022 See More