rarefy
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C2 verb /ˈreə.rɪ.faɪ/

rarefy

Meaning
To make something less dense or more refined.
Example
The air rarefies as you climb higher into the mountains.
C2 noun /dɪˈkæmɪtər/

decameter

Meaning
A metric unit of length equal to ten meters.
Example
The field was measured in decameters for accuracy.
C2 verb /bɪˈhuːvz/

behooves

Meaning
third person singular form of 'behoove'; means it is proper or necessary
Example
It behooves every citizen to follow the law.
C2 noun /ɡleɪd/

glade

Meaning
An open space in a forest or woods.
Example
They rested in a sunny glade after their long hike.
C2 adjective /ˈtʃɜːrlɪʃ/

churlish

Meaning
Rude in a mean-spirited and surly way.
Example
It would be churlish to refuse her kind invitation.
C2 noun/verb /ˈlɛv.ən/

leaven

Meaning
a substance, typically yeast, that causes dough to rise; to permeate and modify
Example
A little yeast will leaven the bread dough.
C2 noun /ˈmæn.li.nəs/

manliness

Meaning
The quality of being manly; courage, strength, and honor associated with men.
Example
His manliness was admired by his peers.
C2 adjective /ˌeθ.noʊˈsen.trɪk/

ethnocentric

Meaning
evaluating other cultures according to the standards of one's own culture
Example
His ethnocentric attitude made it hard for him to appreciate foreign traditions.
C2 adjective /ˈfæn.sɪ.ləs/

fanciless

Meaning
without imagination or creativity; plain or ordinary
Example
His drawings were simple and fanciless.
C2 noun /ˈɡʌp.i fɪʃ/

Guppy fish

Meaning
a small colorful freshwater fish popular in aquariums, known for its vibrant colors and easy breeding
Example
The guppy fish is perfect for beginners who want to start an aquarium.
C2 verb /ˈdɪðər/

dither

Meaning
to be indecisive or unable to make a decision
Example
He dithered for hours before choosing a restaurant.
C2 noun /ˌkiː.təʊˈdʒen.ɪ.sɪs/

ketogenesis

Meaning
The metabolic process by which the liver produces ketones from fatty acids, providing an alternative energy source during low carbohydrate availability.
Example
Ketogenesis occurs during fasting or low-carb diets.
C2 noun /ˈɒkjʊlɪst/

oculist

Meaning
An old-fashioned term for an eye doctor or ophthalmologist.
Example
The village oculist was known for treating various eye diseases.
C2 noun /ˈpɒsi/

posse

Meaning
A group of people, often friends or a group organized to support or enforce the law.
Example
He arrived at the party with his posse of friends.
C2 verb /məʊlt/

molt

Meaning
To shed old feathers, skin, or hair to make way for new growth.
Example
Birds molt their feathers once a year.
C2 adjective /bɪˈsɒtɪd/

besotted

Meaning
strongly infatuated or obsessed with someone or something
Example
He was completely besotted with her charm.
C2 noun /ˌlæs.əˈreɪ.ʃən/

laceration

Meaning
a deep cut or tear in skin or flesh
Example
He needed stitches for a laceration on his leg.
C2 noun əˌmæl.ɡəˈmeɪ.ʃən

amalgamation

Meaning
The action, process, or result of combining or uniting.
Example
The amalgamation of AI and big data is transforming industries.
C2 noun /ˌskʌlˈdʌɡəri/

skullduggery

Meaning
dishonest behavior or activities, often done secretly
Example
The election was full of political skullduggery.
C2 noun /sɪnˈtɪl.ə/

scintilla

Meaning
A tiny trace or spark of a specified quality or feeling.
Example
There wasn’t a scintilla of doubt in her mind.
C2 noun /ɪmˌprɒb.əˈbɪl.ə.ti/

Improbability

Meaning
the quality or state of being improbable; unlikely to be true or to happen
Example
The improbability of winning the lottery twice didn't stop her from buying tickets.
C2 noun /ˈbʊlrʌʃ/

bulrush

Meaning
A tall plant with long leaves that grows in or near water, also known as a cattail.
Example
The pond was surrounded by tall bulrushes swaying in the wind.
C2 adjective /ˈkɒŋɡruənt/

congruent

Meaning
in agreement or harmony; having the same shape and size in geometry
Example
Their values are congruent with the goals of the organization.
C2 adjective /ˈækwɪˌlaɪn/

aquiline

Meaning
curved like an eagle's beak; hooked
Example
He had an aquiline nose that gave him a distinguished appearance.
C2 adjective ˌʌn.əˈseɪ.lə.bəl

unassailable

Meaning
Unable to be attacked, questioned, or defeated.
Example
An unassailable position ensures dominance.
C2 noun /ˈtuːb.roʊz/

Tube-rose

Meaning
a night-blooming flower with an intensely sweet fragrance, native to Mexico
Example
The tuberose flowers filled the evening air with their heavenly scent.
C2 verb /ˌɛfəˈvɛs/

effervesce

Meaning
To give off bubbles of gas; to show excitement, liveliness, or enthusiasm.
Example
The soda began to effervesce as soon as it was opened.
C2 noun /ˌɪntərˈsɛʃən/

intercession

Meaning
the act of intervening or pleading on behalf of another person
Example
The prisoner was released due to the intercession of influential leaders.
C2 adjective /ɪˈrædɪkəbəl/

irradicable

Meaning
not able to be eradicated; impossible to destroy or remove completely
Example
The love of a mother for her child is irradicable.
C2 verb /ɪˈmeɪʃieɪt/

emaciate

Meaning
To make abnormally thin or weak, usually because of illness or lack of food.
Example
The prisoners were emaciated after months without proper food.
C2 noun /ˈtaɪroʊ/

tyro

Meaning
A beginner or novice in a field or activity.
Example
As a tyro in programming, she needed constant guidance.
C2 verb /ˈæmbl/

amble

Meaning
To walk at a slow, relaxed pace.
Example
They amble through the park on Sunday mornings.
C2 noun /ˈdeɪ.mæn/

day-man

Meaning
a worker employed by the day; a day laborer
Example
The farmer hired a day-man to help with the harvest.
C2 verb /əˈbɑː.mə.neɪt/

abominate

Meaning
to feel hatred or loathing for something
Example
She abominates cruelty to animals.
C2 adjective /ˈɡloʊboʊs/

globose

Meaning
Spherical or nearly spherical in shape.
Example
The cactus has large globose fruits.
C2 noun /briːtʃ/

breech

Meaning
The back part of a gun barrel; a position of a baby in the womb where the buttocks or feet come out first at birth.
Example
The rifle was loaded through the breech.
C2 noun /dɪˈprævɪti/

depravity

Meaning
moral corruption; wickedness
Example
The film portrays the moral depravity of a corrupt society.
C2 adjective /baɪˈɛniəl/

biennial

Meaning
happening every two years
Example
The biennial festival attracts thousands of visitors.
C2 verb /skwɛltʃ/

squelch

Meaning
to make a soft sucking sound, such as when walking on mud; to suppress or silence
Example
His boots squelched in the wet ground.
C2 verb /foʊˈmɛnt/

foment

Meaning
To instigate or stir up (an undesirable or violent sentiment or course of action).
Example
The rebel leader tried to foment unrest among the people.
C2 noun /ˈnɒn.ɪʤ/

Nonage

Meaning
the period of being under the legal age of majority; youth or immaturity
Example
During his nonage, all legal decisions were made by his guardian.
C2 noun /kənˈsaɪnər/

consignor

Meaning
a person or company that sends goods to be sold or transported
Example
The consignor shipped the goods to the warehouse.
C2 noun /ˈsaɪ.ə.lɪz.əm/

sciolism

Meaning
pretentious show of superficial knowledge
Example
His speech was full of sciolism, impressing no one.
C2 verb /ˈɑːblɪˌɡeɪt/

obligate

Meaning
to bind legally or morally; to compel someone to do something
Example
The contract obligates the company to provide timely service.
C2 noun /kɒzˈmɒɡ.ə.ni/

cosmogony

Meaning
the study or theory of the origin of the universe
Example
The book provides an overview of different cosmogonies throughout history.
C2 noun /ˌperəˈreɪʃən/

peroration

Meaning
The concluding part of a speech, often intended to inspire or persuade.
Example
The politician's peroration left the audience applauding enthusiastically.
C2 noun, verb /ˈbɛvəl/

bevel

Meaning
A sloping edge or surface; to cut or shape an edge at an angle.
Example
The carpenter beveled the edges of the table.
C2 noun /ˌɪdiəˈsɪŋkrəsi/

idiosyncrasy

Meaning
A distinctive or peculiar characteristic, habit, or mannerism unique to an individual.
Example
One of her idiosyncrasies was humming while working.
C2 noun /dəˈkɔɪt/

Dacoit

Meaning
a member of an armed gang of robbers; a bandit, especially in India and Myanmar
Example
The village was terrorized by a gang of dacoits who robbed travelers.
C2 noun /ˈɛpɪkjʊr/

epicure

Meaning
A person who enjoys fine food and drink, often with refined taste.
Example
As an epicure, she always sought out the finest restaurants in the city.
C2 noun/verb /ˈsʌkər/

succor

Meaning
Assistance and support in times of hardship or distress.
Example
The charity provided succor to the flood victims.
C2 noun /næˈteɪʃən/

natation

Meaning
The act or sport of swimming.
Example
She took lessons in natation to improve her swimming skills.
C2 verb /ˈdʒɛriˌmændər/

gerrymander

Meaning
to manipulate the boundaries of an electoral constituency to favor one party or class
Example
The ruling party was accused of trying to gerrymander the districts to secure more seats.
C2 noun /ˈvɛləm/

vellum

Meaning
a fine parchment made originally from the skin of a calf, used for writing or printing
Example
The ancient manuscript was written on vellum.
C2 noun /rɪˈfɛkʃən/

refection

Meaning
a meal or the act of taking food and drink
Example
The monks gathered for their evening refection.
C2 noun /ˌlɛksɪˈkɒɡrəfər/

lexicographer

Meaning
A person who compiles, writes, or edits dictionaries.
Example
The lexicographer spent years compiling the dictionary.
C2 noun /ɪnˈtɛstəsi/

intestacy

Meaning
The condition of dying without having made a valid will.
Example
His estate was divided according to the laws of intestacy.
C2 noun/verb /ˈkætˌkɔːl/

catcall

Meaning
A loud whistle or shout of disapproval or sexual harassment directed at someone.
Example
The actress ignored the catcalls from the crowd.
C2 noun /əˈmæl.ɡəm/

amalgam

Meaning
a mixture or blend of different things
Example
The new policy is an amalgam of several previous laws.
C2 noun /əˈpɜːrtənənsɪz/

appurtenances

Meaning
Additional items or accessories associated with something, often used in a legal or property context.
Example
The house was sold along with all its appurtenances, including the garage and garden.
C2 noun /ˈdɔːrmər/

dormer

Meaning
A window that projects vertically from a sloping roof.
Example
The old house had a dormer overlooking the garden.
C2 verb /əˈfaɪəns/

affiance

Meaning
to promise or pledge marriage; to formally engage
Example
They decided to affiance after years of friendship.
C2 noun /ˈdjʊərəns/

durance

Meaning
imprisonment or confinement
Example
The prisoner spent years in durance before his release.
C2 adjective /ˈkæloʊ/

callow

Meaning
Inexperienced and immature.
Example
The callow intern made several mistakes on his first day.
C2 noun /ˈsɑːrdʒənt ət ɑːrmz/

sergeant-at-arms

Meaning
An officer responsible for maintaining order during meetings or legislative sessions.
Example
The sergeant-at-arms escorted the disruptive member out of the hall.
C2 noun /aɪər/

ire

Meaning
intense anger or rage
Example
The new policy provoked the ire of the employees.
C2 noun /ˈkɒɡ.nɪ.zəns/

cognizance

Meaning
Awareness, knowledge, or understanding of something; conscious perception.
Example
The judge took cognizance of the new evidence.
C2 verb /ˈdʌv.teɪl/

dovetail

Meaning
to fit or combine perfectly together
Example
Her plans dovetail perfectly with our goals.
C2 noun /ˈdɛkəˌɡræm/

decagram

Meaning
A metric unit of mass equal to ten grams.
Example
The package weighed exactly one decagram.
C2 adjective /ˈkæp.ʃəs/

Captious

Meaning
tending to find fault or raise petty objections; fault-finding; critical
Example
His captious remarks about every small detail made the meeting very unpleasant.
C2 noun /ɪkˈspiːdiənsi/

expediency

Meaning
the quality of being convenient and practical despite possibly being improper or immoral
Example
He acted out of political expediency rather than principle.
C2 noun /bʊr/

Boor

Meaning
a rough and bad-mannered person; someone who lacks refinement or culture
Example
The wealthy businessman was actually a boor who showed no respect for others.
C2 adjective /ˈvɔːntɪd/

vaunted

Meaning
praised or boasted about, especially excessively
Example
The vaunted technology failed to deliver the expected results.
C2 noun /ˈɡlʌtəni/

gluttony

Meaning
Excessive eating or drinking; overindulgence in food or drink.
Example
His gluttony during the festival left him feeling sick.
C2 adjective /dɪˈskrɛpənt/

discrepant

Meaning
showing a difference or inconsistency
Example
The witnesses gave discrepant accounts of the incident.
C2 adjective /ˈʌŋk.tʃu.əs/

unctuous

Meaning
Excessively flattering or ingratiating; oily in texture.
Example
His unctuous tone made everyone uncomfortable.
C2 noun /ˈɔːldər/

alder

Meaning
A type of tree from the birch family that typically grows in wet ground and has simple, serrated leaves.
Example
The alder trees grew thick along the riverbank.
C2 adjective /ɪkˈsɛpʃənəbl/

exceptionable

Meaning
Open to objection; causing disapproval.
Example
His rude remarks were considered exceptionable by everyone present.
C2 adjective /ˌɛl.ɪˈdʒaɪ.ək/

elegiac

Meaning
Expressing sorrow, often for something past; resembling an elegy.
Example
The novel ends on an elegiac note, mourning the lost era.
C2 noun /ˈɪndələns/

indolence

Meaning
Avoidance of activity or exertion; laziness.
Example
His indolence kept him from finishing the project on time.
C2 adjective /ˈnæti/

natty

Meaning
Neat, stylish, and fashionable in appearance.
Example
He looked very natty in his new suit.
C2 noun /proʊˈskrɪp.ʃən/

proscription

Meaning
the act of forbidding something, especially by law
Example
The proscription of child labor is an important human rights achievement.
C2 adverb /ˈdɑːrklɪŋ/

darkling

Meaning
In the dark or growing dark; dimly.
Example
The forest creatures moved darkling through the night.
C2 adjective /ˌɔːfˈkiː/

off-key

Meaning
out of tune; not in accordance with expected standards
Example
The singer was slightly off-key during the performance.
C2 adjective /luːˈɡuːbriəs/

lugubrious

Meaning
looking or sounding sad and dismal
Example
His lugubrious expression made everyone feel uneasy.
C2 adjective /ˌsuːdəˈrɪfɪk/

sudorific

Meaning
causing or increasing sweating
Example
The doctor prescribed a sudorific drug to help reduce the fever.
C2 noun /ˌpɛrəɡrɪˈneɪʃən/

peregrination

Meaning
A long journey or wandering, especially on foot.
Example
Their peregrination across Asia lasted two years.
C2 noun /ˌlɪk.wəˈfeɪ.ʃənt/

liquefacient

Meaning
a substance that causes something to become liquid
Example
The chemist explained how the liquefacient worked in the experiment.
C2 noun /ˌɑːbdʒərˈɡeɪʃən/

objurgation

Meaning
a harsh scolding or strong rebuke
Example
His misconduct earned him a severe objurgation from the manager.
C2 adjective /ˈfɛstəl/

festal

Meaning
relating to a festival or celebration
Example
The hall was decorated in a festal manner for the wedding.
C2 noun /bəˈsuːn/

bassoon

Meaning
a large woodwind instrument with a deep sound
Example
The orchestra featured a beautiful bassoon solo.
C2 noun /ˈfræŋkɪnsɛns/

frankincense

Meaning
An aromatic gum resin used in incense and perfumes, often in religious ceremonies.
Example
The temple was filled with the sweet smell of burning frankincense.
C2 noun /ˈtʃælɪs/

chalice

Meaning
A large cup or goblet, typically used for drinking wine in religious ceremonies.
Example
The priest lifted the golden chalice during the ceremony.
C2 adjective /ɪnˈɡreɪʃiˌeɪtɪŋ/

ingratiating

Meaning
Charming or flattering in a way intended to gain favor.
Example
His ingratiating smile made everyone trust him quickly.
C2 noun /ˌluːkjʊˈbreɪʃən/

lucubration

Meaning
study or meditation, especially at night
Example
His novel was the result of long lucubration.
C2 adjective /boʊˈhiːmiən/

bohemian

Meaning
unconventional, artistic, and free-spirited in lifestyle or appearance
Example
She decorated her apartment in a bohemian style with colorful fabrics.
C2 noun /priˈɛmpʃən/

preemption

Meaning
The act of taking action before someone else; the right to purchase or act before others.
Example
The company exercised preemption to acquire the land before competitors.
C2 noun /ˌænθrəpəˈsɛntrɪzəm/

anthropocentrism

Meaning
The belief that human beings are the most important or central element of existence.
Example
Anthropocentrism often shapes environmental policies.
C2 noun /ˈfrɛʃɪt/

freshet

Meaning
A sudden overflow of a stream or river caused by heavy rain or melting snow.
Example
After the storm, the river turned into a raging freshet.
C2 adjective /fækˈtɪʃəs/

factitious

Meaning
artificial or fabricated; not natural or genuine
Example
The excitement in his story seemed factitious and forced.
C2 noun /ˌproʊɪˈbɪʃənɪst/

prohibitionist

Meaning
A person who supports or advocates prohibition, especially of alcohol.
Example
The prohibitionist campaigned against the sale of liquor in the town.
C2 noun /ˌkæθəˈlɪsɪti/

catholicity

Meaning
Universality; broad-mindedness; acceptance of a wide variety of things.
Example
Her catholicity of interests makes her a fascinating person.
C2 noun /ˈrɛk.tɪ.tjuːd/

rectitude

Meaning
Morally correct behavior or thinking; righteousness and integrity.
Example
His rectitude earned him respect in society.
C2 noun /luːˈbrɪsɪti/

lubricity

Meaning
the quality of being slippery or smooth; sometimes also refers to lewdness
Example
The lubricity of the surface made it difficult to walk on.
C2 noun /ˈhʌvəl/

hovel

Meaning
a small, poorly built, and dirty house
Example
The refugees lived in a makeshift hovel.
C2 noun /fækˈsɪmɪli/

facsimile

Meaning
an exact copy or reproduction of a document
Example
He sent a facsimile of the contract to the client.
C2 noun /ˈjuːnɪvəˌlɛns/

univalence

Meaning
The state of having a single valence or combining power, especially in chemistry.
Example
Hydrogen is characterized by its univalence in chemical reactions.
C2 adjective /ɡɑːrˈɡæntʃuən/

gargantuan

Meaning
Extremely large; enormous.
Example
They served a gargantuan meal at the feast.
C2 noun /əˌbɑː.məˈneɪ.ʃən/

abomination

Meaning
a thing that causes disgust or hatred
Example
Slavery was considered an abomination.
C2 noun /hɒtʃ pɒtʃ/

Hotch potch

Meaning
A mixed dish; a hodgepodge of ingredients cooked together
Example
She made a delicious hotch potch with rice, lentils, and vegetables.
C2 verb /əˈsɪdɪfaɪ/

acidify

Meaning
to make something acidic or more acidic
Example
Farmers worry that pollution will acidify the soil.
C2 noun /traɪˈʌmvɪrət/

triumvirate

Meaning
A political regime ruled or dominated by three powerful individuals.
Example
The Roman Republic was once governed by a triumvirate.
C2 noun /ænˈtɪfəni/

antiphony

Meaning
a form of music in which two or more groups or choirs sing alternately in response to each other
Example
The cathedral's architecture was designed to enhance the effect of antiphony.
C2 adjective /ˌɪndɪˈsɜːrnəbl/

indiscernible

Meaning
Impossible or difficult to see, notice, or distinguish.
Example
The difference between the two shades was almost indiscernible.
C2 noun /ˈkɪŋɡlɪŋ/

kingling

Meaning
A minor or petty king; a ruler of small importance.
Example
The kingling demanded respect from his people despite his small realm.
C2 noun /ˈdɒɡərəl/

doggerel

Meaning
Comic or irregular verse, often poorly constructed and lacking in artistic quality.
Example
The poet’s work was dismissed as mere doggerel by the critics.
C2 adjective /ˈkreɪvən/

craven

Meaning
cowardly; lacking courage
Example
He was too craven to stand up for his beliefs.
C2 noun /ˈɑːrbɪtər/

arbiter

Meaning
a person who has the authority to settle a dispute or decide an issue
Example
The principal acted as the arbiter in the conflict between the students.
C2 adjective /ˌdeɪ.kɒlˈteɪ/

decollete

Meaning
of a woman's dress or top, cut low so as to reveal the neck and upper chest
Example
She wore a decollete gown to the party.
C2 adjective /bɪˈnɪɡnənt/

benignant

Meaning
Kindly and benevolent in nature.
Example
The teacher’s benignant attitude made the students feel comfortable.
C2 adjective /ˈmiːli ˌmaʊðd/

mealy-mouthed

Meaning
Unwilling to speak directly and honestly; insincere or evasive in speech.
Example
The manager gave a mealy-mouthed excuse instead of admitting the mistake.