Wraith refers to the spirit of a dead person, or in other words, a ghost.

// The most frightening scene from the movie featured a vengeful wraith creeping slowly up behind the main characters.

Someone may be described as reticent if they are feeling or showing reluctance, that is, hesitation or unwillingness to do something. Reticent can also describe someone who is reserved, inclined to be silent or uncommunicative about things.

// The team was reticent to spend such a large amount of money, even for an all-star free agent.

// He’s always been reticent about discussing personal matters at work.

Shindig is an informal word for a big party.

// Our friends are in town this weekend, so we’re hosting a shindig at our place on Saturday night.

Grotesque describes something that is very strange or ugly in a way that is not normal or natural. It can also describe something that is extremely different from what is expected or usual.

// She opted for a scary Halloween costume, complete with a grotesque monster mask.

// Their claim is a grotesque distortion of the facts.

Milieu is a formal word that refers to the physical or social setting in which people live or in which something happens or develops.

// Langston Hughes, Zora Neale Hurston, and Jean Toomer were among the many writers who flourished in the intellectual milieu of the Harlem Renaissance.

Disparate things are noticeably distinct from one another in quality or character. Disparate can also describe something that contains or is made up of fundamentally different and often incongruous elements.

// The orchestral project joins disparate musical elements to create a truly original sound.

Puissant is a synonym of powerful used to describe something with puissance—that is, strength or power.

// The creatures in her fantasy novel are wielders of puissant magic, able to strike down enemies by harnessing the power of weather phenomena like lightning and tornadoes.

Asunder is most often used as an adverb—often with a verb such as tear or rip—to mean "apart" or "into pieces." It is more rarely used as an adjective meaning "apart from each other," as in "standing with legs wide asunder."

// The park was torn asunder by yesterday's microburst, and many of its trails have been blocked by fallen trees.

1. A person who has recently or suddenly acquired wealth, importance, position, or the like, but has not yet developed the conventionally appropriate manners, dress, surroundings, etc.

To jilt someone is usually to abruptly end a romantic relationship with them. Jilt is also applied to various kinds of abrupt rejection.

// The novel begins with the hero, having just been jilted by his fiancée, setting off to hike the Appalachian Trail.

Compunction refers to a feeling of misgiving, that is, doubt or suspicion especially concerning a future event. It can also refer to a feeling of guilt or regret. The word is typically used in negative constructions.

// We moved ahead with the plans without compunction.

// They felt no compunctions about their crimes.

Fervid is used to describe people or things that express or are expressive of strong feelings.

// The core of the book is the fervid letters the friends exchanged during the years they were apart.

Outlandish can describe things that are strikingly strange or unusual; in this use, it’s a synonym of bizarre. Outlandish can also describe things, such as claims, rumors, and accusations, that go beyond reasonable limits or standards.

// One of the author’s greatest strengths is her ability to write outlandish characters whose quirks remain lodged in readers’ minds long after they’ve finished the book.

// When asked to back up his outlandish claims, the mayor quickly changed the subject, all but admitting that he had no proof for his allegations.

Deportment refers to the way in which one conducts oneself especially in a formal setting.

// The new students were instructed in proper dress and deportment.

To abscond is to leave, flee, or escape a place in secret and go into hiding. Often, someone is said to have absconded with something.

// It was mid-semester, when fantasies about absconding from school and leaving the stress of exams behind abound.

A nexus is a relationship or connection between people or things. Nexus can also refer to a connected group or series or to the center or focus of something.

// The cultural district serves as a nexus for art and cuisine.

Luddite refers to someone who is opposed to change, and especially to technological change.

// My friends call me a Luddite for refusing to use chat bots.

Regimen refers to a plan or set of rules about food, exercise, etc., designed to make someone become or stay healthy.

// Sherry’s personal trainer started her on a workout regimen of 30 minutes on the treadmill followed by 30 minutes of weight training.

To perseverate is to intently focus one's attention on a thought or thoughts. Perseverate can also mean "to recur or repeat continually."

// They teach that there is no use in perseverating about past regrets.

// Nervous thoughts perseverated in the back of her mind for weeks leading up to the event, but it was a complete success.

Used chiefly in British English, tittle refers to a very small part or amount; it is often paired with the word jot. In writing and printing on both sides of the pond, tittle also refers to a point or small sign used as a diacritical mark.

// There is not a jot or tittle of evidence to support their claims.

Like both unorthodox and unconventional, heterodox describes something, such an idea or belief, that is contrary to or different from an acknowledged standard, a traditional form, or an established religion. Heterodox can also describe a person or group that holds unorthodox opinions or doctrines.

// The two new faculty members' heterodox approach to teaching science initially met with some resistance from their peers.

Slew is an informal word for a large number of people or things.

// The pile of junk mail included a slew of catalogs.

Epistemic means "of or relating to knowledge or knowing."

// He's a brilliant teacher who has the epistemic humility to know that there is always more to learn.

Argot refers to the language or set of words used by a particular group of people.

// The novels were such a success that fans began communicating in the secret argot spoken by the series’ characters.

Fungible describes things, such as currency, goods, and commodities, that can be exchanged for something else of the same kind or value. In broader usage, fungible can also mean “interchangeable,” as well as “readily changeable to adapt to new situations.”

A nemesis is a formidable foe—an opponent or enemy who is very difficult to defeat. As a proper noun, Nemesis refers to the Greek goddess of vengeance.

// She will be playing against her old nemesis for the championship.

To aggrandize someone (or something) is to enhance their power, wealth, position, or reputation. Aggrandize can also mean "to increase or enlarge" or "to praise highly."

// Critics of the book argue that the author aggrandizes corrupt politicians.

Watershed, used figuratively, refers to a crucial dividing point, line, or factor. Used literally, the word may refer to a ridge from which rivers drain on either side, or to the area of land that includes a particular river or lake and all the rivers, streams, etc. that flow into it. : a crucial dividing point, line, or factor

// The protests marked a watershed in the nation’s history.

// The Continental Divide is the most well known watershed in the United States.

When we describe something, such as data, as empirical, we mean that it originated in, or was based on, observation or experience. Empirical can also be used to describe something that can be verified or disproved by observation or experiment, as in “empirical laws.”

// The team of conservation biologists has over the years collected reams of empirical data, from species inventories to soil analyses.

1. anything sunk in the sea, but attached to a buoy or the like so that it may be recovered.

A patina is a usually green film that forms on copper and bronze that is exposed to moist air for an extended time. The word patina can also refer to a shiny or dark surface that over time forms naturally on something (such as wood or leather), or to a literal or figurative thin layer.

// The town erected a statue in her honor, which over the years developed a seafoam green patina.

// Although the winery is brand-new, it has been constructed and decorated to give it a patina of old-world quaintness.

A person who is loath to do something is unwilling or reluctant to do that thing.

// Proud of the company he had built, Henry was loath to admit that it was time to think about retiring.

Stigma refers to a set of negative and often unfair beliefs that a society or group of people have about something.

// The organization is animated by a commitment to challenging stigmas associated with the condition.

Magnanimous is a formal word that means “having or showing a generous and kind nature.”

// She was too magnanimous to resent the unkind words of those grousing about her winning the spelling bee.

Gist, which almost always appears in the phrase “the gist,” refers to the general or basic meaning of something written or said.

// I found the author’s grandiloquent style of writing intolerable, but I got the gist of the story.

To matriculate is to enroll or be enrolled as a student, especially at a college or university.

// She matriculated at the Rhode Island School of Design and began classes in the fall.

// A spokesperson for the college said the school is expected to matriculate approximately 1,000 students for the fall semester.

Apiary refers to a place where bees are kept, and especially a collection of hives or colonies of bees kept for their honey.

// One of the best parts of having a beekeeper for a sister-in-law is getting fresh jars of local honey from the family apiary.

Recalcitrant is a formal word typically used to describe someone who stubbornly refuses to obey rules or orders. Recalcitrant can also describe something that is difficult to manage or operate.

// The magazine, aimed at parents and caregivers of young children, will include the latest in child development science as well as practical information, like tricks for persuading even the most recalcitrant toddler to cooperate.

Dissonant typically describes music that is not in harmony, or sounds and notes that clash. In non-music contexts, dissonant describes things that clash by not being in agreement or by not fitting well together.

// The guitarist struck a dissonant chord.

// The retrospective provided a sometimes dissonant journey through the artist's decades of work.

Conscientious describes someone who is concerned with doing things correctly. It can be used as a synonym for both meticulous and careful.

// She has always been a conscientious worker committed to painstaking research.

Gumption refers to courage and confidence.

// It took a lot of gumption to speak up for yourself like that.

Kith is an old-fashioned term that refers to familiar friends, neighbors, or relatives. It is often used in the phrase “kith and kin,” which means “friends and relatives.”

// Spending time with kith and kin at the end of the summer is the highlight of our year.

Southpaw is an informal word for someone who is left-handed. It is especially used for a left-handed baseball pitcher or boxer.

// The team’s new pitcher is a southpaw with a wicked knuckleball.