Rare Words
Uncommon words with surprising histories. Some are dictionary regulars, a few are modern coinages, and we say which.
A
- agelast noun
- A person who never laughs or who has no sense of humor. “The comedian found it unnerving to perform for the stone-faced critic, a notorious agelast who reviewed shows with clinical detachment.”
- apricity noun
- The warmth of the sun felt on the skin during winter or cold weather. “She pulled her scarf a little looser, enjoying the apricity of the pale January sun on her upturned face.”
B
- borborygmus noun
- The rumbling or gurgling noise produced by the movement of gas through the intestines. “The physician reassured the patient that the persistent borborygmus was simply a sign of normal digestive activity.”
C
- callipygian adjective
- Having well-shaped or finely formed buttocks. “The museum's prized Hellenistic sculpture, celebrated for its callipygian form, drew visitors from across the country.”
D
- defenestration noun
- The act of throwing someone or something out of a window. “The Defenestration of Prague in 1618, when Protestant nobles threw Catholic officials from a castle window, helped ignite the Thirty Years' War.”
- degust verb
- To taste food or drink carefully and with close attention, savoring its qualities in the manner of a formal tasting. “The sommelier invited the guests to degust each wine slowly, noting the transition from the initial burst of fruit to the dry finish.”
E
- eumoirous adjective
- Happy and fortunate as a result of being good or virtuous; blessed with happiness through one's own moral uprightness. “The ancient Stoics believed that the virtuous sage would ultimately be eumoirous—that right conduct was its own assurance of a good life.”
F
- fernweh noun
- A German loanword for an aching, wanderlust-like longing to travel to distant or foreign places, sometimes described as the opposite of homesickness. “A month into lockdown, his fernweh became almost physical, a restless itch that no armchair travel documentary could relieve.”
- frowst noun
- The warm, stuffy, and somewhat stale atmosphere of an unventilated room, often considered cozy by those inside it. “The library had the comfortable frowst of a room that had been heated and inhabited for decades without ever being properly aired.”
H
- hiraeth noun
- A Welsh concept describing a deep, bittersweet longing or nostalgia for a home, era, or sense of belonging that may never have existed or can never be returned to. “She felt a hiraeth for the summers of her childhood that no amount of reminiscing could satisfy.”
K
- kenopsia noun
- The eerie, unsettling atmosphere of a place that is usually bustling but is now eerily empty, such as a school at night or an office on a weekend. “The kenopsia of the deserted amusement park in January was far more unsettling than any horror film she had seen.”
L
- lacuna noun
- A gap, missing portion, or blank space, especially in a manuscript, argument, or body of knowledge. “The historian acknowledged a significant lacuna in the archival record for the decade following the war.”
- limerence noun
- An involuntary, obsessive state of intense romantic infatuation with another person, characterized by intrusive thoughts, longing for reciprocation, and emotional dependency. “She recognized that what she felt was not mature love but limerence—an all-consuming fixation she struggled to think past.”
M
- monachopsis noun
- The subtle but persistent feeling of being out of place, as though one does not quite fit into one's surroundings or social environment. “Despite her professional success, she never shook the monachopsis she felt at corporate networking events.”
- mumpsimus noun
- A person who obstinately adheres to an old, erroneous custom or belief even after being shown the correct version; also, the erroneous notion or habit itself. “No amount of evidence could shake his mumpsimus; he continued to pronounce the word incorrectly simply because he always had.”
N
- noctiluca noun
- A genus of large, spherical, bioluminescent marine dinoflagellates that produce the glowing blue-green light visible in disturbed seawater at night; also used more generally to refer to any such light-producing sea organism. “The kayakers paddled in silence as each stroke ignited blooms of noctiluca, turning the dark water electric blue.”
- numinous adjective
- Having a strong sense of the divine, supernatural, or spiritually awe-inspiring quality that provokes a feeling of reverence and mystery. “Standing alone in the ancient cathedral at dawn, she felt a numinous presence that no rational explanation could dispel.”
P
- petrichor noun
- The pleasant, earthy smell produced when rain falls on dry ground. “After weeks of drought, the first summer storm filled the air with petrichor that the whole town seemed to stop and inhale.”
- pogonotrophy noun
- The cultivation or growing of a beard. “His dedication to pogonotrophy was evident in the magnificent, carefully oiled beard he had cultivated over three years.”
S
- scripturient adjective
- Having a consuming urge or passion to write. “Her scripturient tendencies meant that she kept notebooks in every room of the house, scribbling observations at all hours.”
- sempiternal adjective
- Lasting or existing forever without beginning or end; eternal and everlasting. “The philosopher argued that mathematical truths are sempiternal, existing beyond the confines of time or physical reality.”
- sillage noun
- The lingering trail of scent left in the air by a person's perfume after they have passed through or left a space. “Her sillage was so distinctive that colleagues knew she had walked through the hallway before they even looked up.”
- snollygoster noun
- A shrewd, unprincipled person, especially a politician who acts for personal gain rather than from genuine conviction. “The editorial accused the senator of being a classic snollygoster, switching positions the moment the polls shifted.”
- solivagant adjective
- Wandering alone; fond of or given to solitary roaming. “A confirmed solivagant, he preferred hiking unmarked trails without companions, finding crowds a distraction from the landscape.”
- sonder noun
- The sudden, striking realization that every passerby has a life as vivid, complex, and ongoing as one's own. “Walking through the busy train station, she felt a wave of sonder as she watched strangers rushing past, each consumed by their own private dramas.”
- susurrus noun
- A soft, whispering or murmuring sound, such as that of wind through leaves or quiet voices in a crowd. “A susurrus of wind moved through the tall grass at the edge of the meadow, barely audible above the birdsong.”
- syzygy noun
- In astronomy, the alignment of three celestial bodies—especially the Earth, Sun, and Moon—in a straight or nearly straight line, as occurs during eclipses and full or new moons. “The spectacular solar eclipse was the result of a perfect syzygy of the Earth, Moon, and Sun.”
T
- tmesis noun
- A rhetorical and linguistic figure in which a word or phrase is split and another word is inserted in the middle, as in 'abso-blooming-lutely.' “The exclamation 'fan-bloody-tastic' is a classic example of tmesis, embedding an expletive inside another word for emphasis.”
V
- vellichor noun
- The strange, melancholy feeling of being in a used-book store, aware that each volume contains a whole world that you will likely never have time to read. “Wandering the cramped aisles of the secondhand bookshop, she was overcome with vellichor at the sight of so many unread spines.”
Z
- zugzwang noun
- In chess, a situation in which a player is obligated to move but every available move will worsen their position. “With all his pieces pinned, the grandmaster found himself in zugzwang — every legal move would cost him a decisive advantage.”
Questions people ask
Are these rare words real?
Most are in major dictionaries such as Merriam-Webster or the Oxford English Dictionary. A few, like sonder, kenopsia, monachopsis and vellichor, were coined recently by John Koenig’s Dictionary of Obscure Sorrows and are not yet in standard dictionaries; their entries say so where it matters.
What is the rarest word in English?
There is no single answer: many entries in the Oxford English Dictionary are recorded only a handful of times. The words here were chosen because they are rare but genuinely useful or delightful.