Fastidious comes from Latin fastidium, meaning "aversion" or "disgust." Fastidium is believed to be a combination of fastus, meaning "arrogance," and taedium, "irksomeness" or "disgust." (Taedium is also the source of tedium and tedious.) In keeping with its Latin roots, fastidious once meant "haughty," "disgusting," and "disagreeable," but the word is now most often applied to people who are very meticulous or overly difficult to please, or to work which reflects a demanding or precise attitude.
My mother had always been the most fastidious and organized of people—a wet ring left on her coffee table by a glass could drive her to distraction. John B. Judis, New Republic, 14 Oct. 1996"I'll stop off and get us a sandwich," said Matthew. … Tony, a fastidious eater, sighed. Penelope Lively, City of the Mind, 1991Though he prides himself on being hip, he is too fastidious to do anything dangerous or dirty. Jay McInerney, Bright Lights, Big City, 1984 He is fastidious about keeping the house clean. She was too fastidious to do anything that might get her dirty.
Recent Examples on the WebBasenjis also have a catlike demeanor, and these fastidious little creatures will even groom themselves. Katarina Avendano, Good Housekeeping, 25 Aug. 2022 Anyone in the secured lending business, and its counsel, must approach the process with a fastidious attention to detail and process. Joshua Stein, Forbes, 16 May 2022 This kind of sterility requires fastidious cleaning. Ali Francis, Bon Appétit, 13 Aug. 2022 One day, Carmy’s sous chef, Sydney—an ambitious and fastidious young woman with serious fine-dining bona fides herself—reaches a breaking point, storming out of the kitchen after Carmy blows up at her. Carrie Battan, The New Yorker, 1 Aug. 2022 Murnane has described himself as a technical writer, and his outspoken and fastidious devotion to grammar steers a great deal of the thinking his narrators perform. Merve Emre, The New Yorker, 25 July 2022 The editing is fastidious, much as in Nathan for You and How to With John Wilson (which Fielder produces), often underscoring a joke by zooming in on an amusing detail or cutting to the comedian’s reaction at just the right moment. Shirley Li, The Atlantic, 16 July 2022 But your sister-in-law has not been so fastidious: Her behavior is genuinely rude. Jacobina Martin, Washington Post, 19 May 2022 One of the most quotable characters from the series, Tony Sirico’s fastidious and impeccably coiffured capo is also one of the most tempting to impersonate. Josh Rottenberg, Los Angeles Times, 25 Aug. 2021 See More
Word History
Etymology
Middle English, from Latin fastidiosus, from fastidium disgust, probably from fastus arrogance (probably akin to Latin fastigium top) + taedium irksomeness — more at tedium