Something that festers becomes worse as time passes. Fester can also mean, in the context of wounds, sores, etc., “to become painful and infected.”

// We should deal with these problems now instead of allowing them to fester.

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“Minor plumbing leaks left to fester have snowballed into water seeping down walls and out of light fixtures ...” — Devyani Chhetri, The Dallas Morning News, 11 Mar. 2025

Both noun and verb forms of the English word fester come from the Latin noun fistula, meaning “pipe” or, less pleasantly, “fistulous ulcer.” Accordingly, the noun fester refers to a sore that forms or discharges pus, while the oldest sense of the verb fester means “to generate pus.” A boil, for example, is a festering infection of a hair follicle. Over time, the verb—as many words do—picked up a figurative sense, and fester began to be used not only for the worsening of a wound but for a worsening state, situation, etc.

Darling can refer to a dearly loved person or to someone who is liked very much by a person or group. It can also mean “a kind and helpful person” as in, “Be a darling and carry this inside for me, would you?”

// Our baby grandchild is just the sweetest little darling.

// The actor has become a darling of the entertainment industry in both film and music.

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“Rocking a BAPE hoodie and a slight nervousness, Jorjiana performed a freestyle and her most popular song, ‘ILBB2.’ And then boom: There’s no such thing as an overnight success, but it did seem as if Jorjiana was a social media darling by the next day.” — Damien Scott, Billboard, 20 Feb. 2025

The opening lines of the rock band Wilco’s song “My Darling,” sung from the perspective of a parent calming their sleepless child, demonstrate a very common use of the word darling: “Go back to sleep now, my darling / And I’ll keep all the bad dreams away.” Darling is an ancient word, traceable all the way back to the Old English noun dēorling, which was formed by attaching the suffix -ling to the adjective dēore, the ancestor of dear, which describes that which is regarded very affectionately or fondly, is highly valued or esteemed, or is beloved. Darling, as in “my darling,” is often used as a term of endearment, whether for a child or a sweetheart, but it can also be used as a synonym of the noun favorite, as in “the word darling has proven itself a darling of songwriters for many centuries.”

Uncanny is typically used to describe something that is strange or unusual in a way that is surprising or difficult to understand. It can also describe something that seems to have a supernatural character or origin.

// The child has an uncanny ability to recognize streets and locations she's seen only once or twice before.

// The lights suddenly flickered, and we were both overcome with an eerie, uncanny feeling.

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"... as Nelson Moultrie walked through the cemetery and observed trees growing in ways that resemble the shapes of people, like one that bore an uncanny resemblance to a pair of legs, she said she's already felt the presence of the people buried there." — Laura Liebman, The Post & Courier (Charleston, South Carolina), 21 Mar. 2025

Uncanny describes that which unsettles us, such as disquieting observations, or mysterious situations and circumstances. Strip the word of its prefix, though, and you're left with canny, a word that can be used as a synonym for clever and prudent. While canny and uncanny don't appear to be antonyms, they both come from an early Scots word canny meaning "free from risk; wise, prudent, cautious." And in Scots, canny has for centuries had a secondary meaning more similar to that of its mysterious cousin: the Oxford English Dictionary defines a sense of the word used chiefly in negative constructions (e.g., “not canny”) to describe what is not safe to be involved with, or more broadly, what is not in accordance with what is right or natural, as in "the idea is not canny." Rather uncanny.

To gloss a word or phrase is to provide its meaning, or in other words, to explain or define it.

// Many unfamiliar terms are glossed in the book’s introduction.

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“It is revealing that early dictionaries regularly defined equality as ‘conformity,’ or glossed the word, like Noah Webster did in 1806, as ‘likeness, evenness, uniformity.’” — Darrin M. McMahon, The Chronicle of Higher Education, 1 Apr. 2024

If you’re the type of word nerd who finds poring over book glossaries to be the bee’s knees, we know you’ll get a buzz from this gloss of the verb gloss. To gloss something, such as a word or phrase, is to explain or define it. The noun gloss, it follows, refers to (among other things) a brief explanation of a word or expression. And a glossary of course is a collection of textual glosses, or of specialized terms, with their meanings. Both forms of gloss, as well as the word glossary, trace back to the Greek noun glôssa, meaning “tongue,” “language,” or “obscure word requiring explanation.” Another descendent of glôssa, the English noun glossa, refers not to a bee’s knees but to a bee’s tongue, or to the tongue of another insect.

Modicum is a formal word that means “a small amount.” It is almost always used with of.

// The band enjoyed a modicum of success in the early 2010s before becoming an international sensation.

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“Imagine, for example, that the gods decided to bestow upon Sisyphus a modicum of mercy. The rock, the hill, the never-ending, pointless labor all remained nonnegotiable as far as the gods were concerned, but the mercy of the gods was to change Sisyphus’s attitude to these things. … He is never happier than when rolling large boulders up steep hills, and the gods have offered him the eternal fulfillment of this strange desire.” — Mark Rowlands, The Word of Dog: What Our Canine Companions Can Teach Us About Living a Good Life, 2024

It wouldn’t be wrong to say that the English language has more than a modicum of words referring to a small amount of something—it has oodles, from smidgen to soupçon. But while modicum can be applied to countable or physical things (like words or salt) it is almost always applied instead to abstract concepts like respect, success, control, hope, dignity, or privacy. Modicum traces back to the Latin noun modus, meaning “measure,” which just so happens to be the ancestor of more than a modicum of English words, from moderate and modify to mold and commode.

Bumptious describes people who are rudely and often noisily confident or over-assertive. It can also be applied to actions or behaviors that show this same attitude.

// Our host apologized for the bumptious party guest who caused a scene before being asked to leave.

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"She comes across as a bumptious, irritating ten-year-old who believes that her main vice, her steam-roller self-confidence, is a virtue." — Lloyd Evans, The Spectator (London), 17 Aug. 2024

While evidence dates bumptious to the beginning of the 19th century, the word was uncommon enough decades later that Edward Bulwer-Lytton included the following in his 1850 My Novel: "'She holds her head higher, I think,' said the landlord, smiling. 'She was always—not exactly proud like, but what I calls Bumptious.' 'I never heard that word before,' said the parson, laying down his knife and fork. 'Bumptious indeed, though I believe it is not in the dictionary, has crept into familiar parlance, especially amongst young folks at school and college.'" The word is, of course, now in "the dictionary"; ours notes that it comes from the noun bump and the suffix -tious, echoing other disapproving modifiers including captious ("fault-finding") and fractious ("troublemaking").

To exculpate someone is to prove that they are not guilty of doing something wrong.

// The editorial expresses confidence that the evidence will exculpate the accused.

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“Research shows that social-media use is associated with greater narcissism (as well as depression and anxiety).... But it is too easy to exculpate ourselves as a society by pointing to technology and trends we can scarcely control, and young adults may not be in a position to address their avoidant behavior. The rest of us can help.” — Arthur C. Brooks, The Atlantic, 1 June 2023

There’s no need to say “my bad” if you’re unfamiliar with exculpate; while the word is far from rare, it is most often encountered in formal writing in reference to the clearing of someone of alleged fault or guilt, as in “they were exculpated of any wrongdoing.” You may be more familiar with a pair of terms that, like exculpate, come from the Latin noun culpa, meaning “blame” or “guilt.” One is the adjective culpable, used to describe someone deserving of condemnation or blame. The other is the Latin phrase mea culpa, which translates directly as “through my fault” and refers to an acknowledgement of personal fault or error that is more formal than, well, “my bad.”

Plethora refers to a very large amount or number of something. Plethora is most often used in the phrase "a plethora of."

// The hotel offers a plethora of amenities, including indoor and outdoor pools, a fitness center, and world-class dining.

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"In 1895, Japan won Taiwan from China in the Treaty of Shimonoseki, ending the Sino-Japanese War, and from 1895 to 1945, the island was a colony of Japan. The cultural influences of Japan persist to this day: in the tiny coffee shops with their enticing nutty aromas, in the plethora of Japanese-influenced sushi restaurants, and in Taiwan's highly efficient postal service and train systems." — Kim Liao, Where Every Ghost Has a Name: A Memoir of Taiwanese Independence, 2024

Plethora was first used in English to refer to a medical condition marked by an excess volume of blood or other bodily fluid, with associated swelling and redness. (Its Greek ancestor, the noun plēthṓra, refers to a similar excess, or to general fullness or crowdedness.) These days, plethora is most often used in general contexts to refer to a large number or amount of something. While plethora conveys a plural meaning, it is a grammatically singular word, which makes choosing whether to pair it with a singular or plural verb confusing. Both can be correctly used, however; choose the singular if you wish to emphasize the grouping or collection ("a plethora of books is available"), and choose the plural if you wish to emphasize the individual elements or components ("a plethora of books have been written on the subject").

Risible is a formal word used disapprovingly to describe things that deserve to be mocked or laughed at because they are absurd or unreasonable.

// Although the teachers derided the students’ slang as risible nonsense, the same had been said about their own generation’s lingo.

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"Smartwatches and smartphones are banned in my children’s schools during the school day, which I’m very happy about; I find any argument for allowing these devices in the classroom to be risible." — Jessica Grose, The New York Times, 27 Mar. 2024

Say “cheese”! Now say thank you to the risorius muscles near the corners of your mouth for helping you smile. You might find this exercise a bit ridiculous—risible, even—but we’re here to explain that there is no need for derision; it’s for a wordy reason. Risible, ridiculous, derision, and risorius all come from the Latin verb ridēre, meaning “to laugh.” This etymology helps make the meaning of risible clear; something is described as risible (such as saying “cheese” out loud to yourself while looking at your phone/computer) when it arouses or provokes laughter. But just as its synonym laughable often describes things deserving not just of laughter but of eye-rolling scorn, risible is frequently applied to that which merits both sneer and chortle, scoff and guffaw. Words are funny like that.

To sleuth is to carefully or methodically search for information, or to act as a detective.

// We spent hours at the flea market sleuthing for 19th century paintings.

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"To fill the market with vintage treasure, we called upon some of the industry’s best dressed—Anok Yai, Emma Chamberlain, Hamish Bowles, Julia Sarr-Jamois, Kaia Gerber, Paloma Elsesser, Tabitha Simmons, Tonne Goodman, and Gigi Hadid—to sleuth through eBay and curate their must-haves." — Lilah Ramzi, Vogue, 6 March 2025

"They were the footprints of a gigantic hound!" Those canine tracks in Arthur Conan Doyle's The Hound of the Baskervilles set the great Sherlock Holmes sleuthing on the trail of a murderer. It was a case of art imitating etymology. When Middle English speakers first borrowed sleuth from the Old Norse word slōth, the term referred to the track of an animal or person. In Scotland, sleuth hund referred to a kind of bloodhound used to hunt game or track down fugitives from justice. In 19th-century U.S. English, sleuthhound, soon shortened to sleuth, began to be used for a detective. From there, sleuth slipped into verb use to apply to what a sleuth does.