backslide
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C2 verb /ˈbækˌslaɪd/

backslide

Meaning
To relapse into bad habits, undesirable practices, or moral decline.
Example
After months of progress, he began to backslide into old habits.
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 /ˈɛskwaɪər/

esquire

Meaning
A title of respect often used after a man's name, especially for lawyers in the United States.
Example
John Smith, Esquire, will be representing the client in court.
C2 noun /səˈnɛs.əns/

senescence

Meaning
The process of growing old or the condition of aging.
Example
The biologist studied senescence in plants to understand aging.
C2 adjective /ʌnˈkɒnʃənəbl/

unconscionable

Meaning
shockingly unfair or unreasonable
Example
The company made unconscionable profits from the crisis.
C2 noun /troʊp/

trope

Meaning
A common or overused theme, idea, or device in literature, film, or speech.
Example
The film avoided the usual superhero tropes.
C2 adverb /əˈmʌk/

amok

Meaning
Behaving uncontrollably and disruptively.
Example
The angry mob ran amok after the verdict was announced.
C2 noun /ˈɪn.tɪ.ɡreɪ.tɪv dɪˈpləʊ.mə.si/

integrative diplomacy

Meaning
A diplomatic approach that seeks to combine or coordinate different elements, interests, or parties into a unified whole.
Example
Integrative diplomacy strengthens alliances.
C2 noun /ˌɛksəˈdʒiːsɪs/

exegesis

Meaning
A critical explanation or interpretation of a text, especially a religious scripture.
Example
The professor gave a detailed exegesis of the biblical passage.
C2 noun /ˌæs.əˈfet.ɪ.də/

Asafoetida

Meaning
a pungent spice derived from the resin of a plant, commonly used in Indian cooking
Example
A pinch of asafoetida adds a distinctive flavor to the lentil curry.
C2 adjective /ˌhɑːrdˈbɪtn̩/

hard-bitten

Meaning
tough and experienced, not easily affected by emotions or hardship
Example
The hard-bitten detective showed no sign of surprise at the crime scene.
C2 noun /rɪˈsɪʒən/

rescission

Meaning
the cancellation or annulment of a law, contract, or agreement
Example
The rescission of the contract left both parties disappointed.
C2 verb /ˈflædʒəˌleɪt/

flagellate

Meaning
to whip or flog someone, either literally or as a form of punishment or self-discipline
Example
In history, some monks would flagellate themselves as penance.
C2 adjective /ɪˈfjuːsɪv/

effusive

Meaning
Expressing feelings of gratitude, pleasure, or approval in an unrestrained or heartfelt manner.
Example
She gave him an effusive welcome after his long journey.
C2 noun /ˈɔːrɪkl̩/

auricle

Meaning
The external part of the ear; also an upper chamber of the heart in anatomy.
Example
The doctor examined the patient’s auricle for signs of infection.
C2 adjective /ˈstɪdʒiən/

stygian

Meaning
extremely dark, gloomy, or forbidding
Example
They walked through the stygian cave with torches.
C2 noun /ˈmɪsəl/

missal

Meaning
a book containing the texts used in the Catholic Mass throughout the year
Example
The priest read from the missal during the ceremony.
C2 noun /ˌrɛprəˈbeɪʃən/

reprobation

Meaning
Strong disapproval or condemnation; rejection by God as beyond salvation.
Example
The teacher’s face showed clear reprobation at the student’s rude remark.
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/verb /ˈkʌdʒ.əl/

cudgel

Meaning
A short, thick stick used as a weapon; to beat with a cudgel.
Example
The guard used a cudgel to chase away the thief.
C2 adjective /ɪˈlɪmɪtəbl/

illimitable

Meaning
Without limits or bounds.
Example
The universe is often described as illimitable.
C2 noun /ˈduːti/

Dhuti

Meaning
a traditional Indian garment for men consisting of a piece of unstitched cloth worn around the waist and legs
Example
The elderly man wore a white dhuti during the religious ceremony.
C2 adjective /pəˈnjʊəriəs/

penurious

Meaning
extremely poor; poverty-stricken; miserly
Example
The penurious family struggled to buy food.
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 adverb /əˈbɛd/

abed

Meaning
in bed
Example
She stayed abed all day due to illness.
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 /ˌkɑːnfɔːrˈmeɪʃən/

conformation

Meaning
The shape, structure, or arrangement of something.
Example
The scientist studied the molecular conformation of the protein.
C2 adjective /ɑːlˈfæktəri/

olfactory

Meaning
Relating to the sense of smell.
Example
The perfume activated her olfactory nerves immediately.
C2 noun /ˈbɑːr.kəˌroʊl/

barcarole

Meaning
a traditional Venetian boat song, often in 6/8 time
Example
The orchestra played a beautiful barcarole that reminded me of Venice.
C2 noun /pəˈlæv.ər/

palaver

Meaning
prolonged and idle discussion; fuss or unnecessary talk
Example
After much palaver, they finally agreed on the plan.
C2 noun /ˌkɔːrnjuˈkoʊpiə/

cornucopia

Meaning
an abundance or overflowing supply of something
Example
The festival offered a cornucopia of fruits and sweets.
C2 noun /ˌmɑːhəˈrɑːdʒə/

maharaja

Meaning
A great king, especially a ruler of one of the principal states in India.
Example
The maharaja lived in a grand palace surrounded by gardens.
C2 noun /lɪˈbrɛtoʊ/

libretto

Meaning
The text of an opera or other long vocal work.
Example
She studied the libretto before attending the opera performance.
C2 noun /ˈpælɪˌnoʊd/

palinode

Meaning
a poem or statement in which the writer retracts something said in an earlier work
Example
The poet wrote a palinode to apologize for his earlier harsh words.
C2 adjective /ˈvɒkətɪv/

vocative

Meaning
relating to a case in grammar used for directly addressing someone
Example
In Latin, the vocative case is used when directly calling someone by name.
C2 adjective /ˈdɪsənənt/

dissonant

Meaning
Harsh and lacking harmony; conflicting.
Example
The orchestra produced a dissonant sound during rehearsal.
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 /ˈmɜːkinəs/

murkiness

Meaning
The quality of being dark, gloomy, or unclear.
Example
The murkiness of the water made it hard to see the fish.
C2 noun /brəˈkeɪd/

brocade

Meaning
a rich fabric woven with a raised pattern, often in gold or silver thread
Example
She wore a beautiful brocade dress to the wedding.
C2 noun /ˈbɒnəmi/

bonhomie

Meaning
Cheerful friendliness and geniality.
Example
The meeting was filled with laughter and bonhomie.
C2 adjective /mɔːrˈdeɪʃəs/

mordacious

Meaning
Sharp or biting in style, tone, or remark; sarcastic.
Example
The critic’s mordacious review offended the author.
C2 noun /ˈɡræn.juːl/

granule

Meaning
A small compact particle of a substance.
Example
Each granule of salt sparkled under the sunlight.
C2 adjective /ʌnˈtræməld/

untrammeled

Meaning
Not restricted or hampered; free and unrestricted.
Example
She enjoyed untrammeled freedom in her new life abroad.
C2 noun /ˈpɛstɪləns/

pestilence

Meaning
A deadly or virulent epidemic disease that spreads rapidly.
Example
The medieval city was devastated by a pestilence.
C2 noun /dɪˈmeɪn/

demesne

Meaning
Land attached to a manor and retained for the owner's use.
Example
The castle was surrounded by its vast demesne.
C2 verb /ˈdʌv.teɪl/

dovetail

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

coltish

Meaning
Playful, energetic, and not fully mature or disciplined.
Example
The coltish boy ran around the field without a care.
C2 verb /əbˈtruːd/

obtrude

Meaning
to force oneself or one's ideas into a situation uninvited or inappropriately
Example
He didn’t want to obtrude into their private conversation.
C2 adjective /ˌbækəˈneɪliən/

bacchanalian

Meaning
Characterized by or involving drunken revelry.
Example
The students threw a bacchanalian party after the exams.
C2 noun /ˈvaɪəl/

viol

Meaning
A stringed musical instrument of the Renaissance and Baroque periods, played with a bow and similar to but distinct from the violin family.
Example
The musician played an old viol in the chamber music concert.
C2 noun /əˈdʌltərənt/

adulterant

Meaning
a substance added to something else, often food or drink, to reduce its quality or strength
Example
The laboratory found an adulterant in the milk samples.
C2 noun /dʒæm/

jamb

Meaning
The side post or surface of a doorway, window, or fireplace.
Example
The carpenter carefully measured the width of the door jamb.
C2 noun /əˈɡrɒnəmɪst/

agronomist

Meaning
A scientist who studies soil management and crop production.
Example
The agronomist suggested new methods to improve rice yields.
C2 noun /ˈiːsθiːt/ or /ˈɛsθiːt/

aesthete

Meaning
A person who has a special appreciation of art and beauty.
Example
The aesthete admired the subtle details of the painting.
C2 noun /ˈstrætədʒəm/

stratagem

Meaning
a plan or scheme designed to achieve a particular goal, often by trickery
Example
The general devised a clever stratagem to outwit the enemy.
C2 noun /ˈmɒnəkl/

monocle

Meaning
A single round lens for one eye, used to correct or enhance vision.
Example
The old gentleman wore a monocle at formal events.
C2 noun /lʌɡˈʒʊəriəns/

luxuriance

Meaning
abundant growth, richness, or elegance
Example
The garden was filled with the luxuriance of tropical plants.
C2 noun /ˈmæl.əˌfæk.tər/

malefactor

Meaning
A person who commits a crime or does evil.
Example
The malefactor was arrested for the robbery.
C2 noun /əˈluːviən/

alluvion

Meaning
The gradual increase of land by the deposit of soil from water; also, a flood or overflow of water.
Example
The river’s alluvion added new fertile land to the village fields.
C2 noun /ˌɑːrtʃˈdiːkən/

archdeacon

Meaning
A senior clergyman in the Christian Church ranking below a bishop.
Example
The archdeacon assisted the bishop in administrative duties.
C2 adjective /ˈhoʊm.spʌn/

homespun

Meaning
Simple and unsophisticated; made at home rather than in a factory.
Example
She wore a homespun dress to the village festival.
C2 noun /ˈænsɛstrɪs/

ancestress

Meaning
a female ancestor; a woman from whom one is descended
Example
She discovered that her ancestress came from a small village in Bengal.
C2 noun /ˈɛərəˌstæt/

aerostat

Meaning
A lighter-than-air craft, such as a balloon, that is lifted by gas.
Example
The military used an aerostat for surveillance over the border.
C2 verb /ˈeksɪkreɪt/

execrate

Meaning
To feel or express great loathing or hatred for something.
Example
The community execrated the corrupt politician.
C2 noun /ˈdɛθsˌhɛd/

deaths-head

Meaning
A representation of a human skull, often used as a symbol of death.
Example
The pirate flag was marked with a grim deaths-head.
C2 noun /spjuːm/

spume

Meaning
Froth or foam, especially found on waves or liquids.
Example
The waves crashed against the rocks, leaving spume in the air.
C2 noun /ˈrɛtɪnjuː/

retinue

Meaning
A group of attendants or followers accompanying an important person.
Example
The king entered the hall followed by his retinue.
C2 adjective /ˈsteɪ.dʒi/

stagy

Meaning
Overly theatrical, artificial, or exaggerated in manner or style.
Example
Her performance felt stagy and unnatural.
C2 verb /pɔːrˈtɛnd/

portend

Meaning
To be a sign or warning that something, especially something bad, is going to happen.
Example
Dark clouds portend a storm.
C2 verb /bɪˈleɪbər/

belabor

Meaning
to argue or elaborate on a subject in excessive detail; to attack verbally or physically
Example
The professor belabored the point until the students grew restless.
C2 adjective /ˈtɜːrbɪd/

turbid

Meaning
Cloudy, opaque, or thick with suspended matter; confused or obscure in meaning.
Example
The river water became turbid after the heavy rains.
C2 noun /ˈʌm.brə/

Umbra

Meaning
the fully shaded inner region of a shadow cast by an opaque object; the dark center of a sunspot
Example
During the eclipse, we stood in the moon's umbra.
C2 verb /fɪltʃ/

filch

Meaning
to steal something in a sneaky or petty way
Example
He tried to filch a candy bar from the shop.
C2 adjective /ˌdɪskəmˈbɑːbjuleɪtɪd/

discombobulated

Meaning
confused and disoriented; feeling unsettled
Example
She looked discombobulated after hearing the unexpected news.
C2 adjective /pɒnˈtɪfɪkəl/

pontifical

Meaning
relating to a pope or bishop; pompous or self-important
Example
His pontifical manner annoyed the other members of the committee.
C2 verb /ˈæntɪkweɪt/

antiquate

Meaning
To make something old-fashioned or obsolete.
Example
The rise of digital cameras antiquated traditional film photography.
C2 adjective /ˌvɪtriˈɑːlɪk/

vitriolic

Meaning
filled with bitter criticism or malice
Example
His vitriolic remarks hurt everyone in the room.
C2 verb /rɛst/

wrest

Meaning
to forcibly pull something from a person's grasp; to seize with effort or struggle
Example
The police had to wrest the weapon from the suspect's hand.
C2 noun /ˌdiːlɛkˈteɪʃən/

delectation

Meaning
great pleasure or delight
Example
She read the story aloud for the delectation of her friends.
C2 adjective /ˈrɛɡnənt/

regnant

Meaning
Reigning; currently holding power, authority, or dominance.
Example
The regnant queen introduced several reforms during her reign.
C2 noun /vəˈliːɪti/

velleity

Meaning
A wish or inclination not strong enough to lead to action.
Example
His interest in painting never grew beyond a mere velleity.
C2 noun /ˈɑːr.bɪ.trɑːʒ/

arbitrage

Meaning
The simultaneous buying and selling of securities in different markets to take advantage of differing prices.
Example
Investors use arbitrage to make profits in global markets.
C2 verb /ˈræŋ.kəl/

rankle

Meaning
To cause continuing annoyance or resentment.
Example
His unfair criticism continued to rankle her for days.
C2 adjective /ˈmjuːlɪʃ/

mulish

Meaning
extremely stubborn or unwilling to change
Example
She remained mulish despite all the convincing arguments.
C2 noun /ˌmɛtəfɪˈzɪʃən/

metaphysician

Meaning
A person who studies or is an expert in metaphysics.
Example
The metaphysician debated the essence of reality with his peers.
C2 noun /ɪmˈpaɪ.ə.ti/

Impiety

Meaning
lack of piety or reverence, especially for a god; disrespect or irreverence toward religious matters
Example
His impiety shocked the religious community when he mocked their sacred ceremonies.
C2 noun /dɪˈstreɪnər/

distrainor

Meaning
a person, usually a landlord, who seizes another's property for unpaid debt or rent
Example
The distrainor took possession of the tenant's car until the debt was cleared.
C2 noun /ˈtʃɜː.nɪŋ stɪk/

Churning stick

Meaning
a wooden stick used for stirring and churning butter, milk, or other liquids
Example
Grandmother used a churning stick to make fresh butter.
C2 noun /ˈhɛfər/

heifer

Meaning
a young cow that has not borne a calf
Example
The farmer raised a heifer for dairy production.
C2 noun /riːm/

ream

Meaning
A large quantity of paper (typically 500 sheets); informally, a large amount of something.
Example
The office ordered ten reams of paper.
C2 noun /ˈleɪ.ɪ.ti/

laity

Meaning
Ordinary members of a religious community who are not clergy.
Example
The church welcomed the laity to participate in the event.
C2 noun /ˈvaɪsrɔɪ/

viceroy

Meaning
a ruler exercising authority on behalf of a sovereign in a colony or province
Example
The viceroy governed the colony in the king's name.
C2 adjective /ˌʌnəˈʃʊəd/

unassured

Meaning
Lacking confidence or certainty.
Example
She gave an unassured answer during the interview.
C2 noun /ˈpɜːrljuː/

purlieu

Meaning
The area near or surrounding a place; an outlying or neighboring district.
Example
They spent the afternoon exploring the purlieus of the ancient city.
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 verb /ɪˈluːmɪn/

illumine

Meaning
to light up or make clear
Example
The rising sun illumined the mountain peaks.
C2 noun /ˈɒlɪv bɑːb/

Olive barb

Meaning
A small freshwater fish with olive-colored body and barbels
Example
The olive barb is commonly found in South Asian rivers.
C2 noun /ˈmɛtələ(r)dʒi/

metallurgy

Meaning
The science and technology of metals, including their extraction from ores and their processing.
Example
Metallurgy plays a vital role in industrial development.
C2 noun /ˈhɛklər/

heckler

Meaning
A person who interrupts a speaker with rude or aggressive comments.
Example
The politician remained calm despite the heckler shouting from the crowd.
C2 verb /əˈdjuːs/

adduce

Meaning
To provide evidence or reasons to support an argument or idea.
Example
The lawyer adduced several examples to support his case.
C2 adjective /hərˈmɛtɪk/

hermetic

Meaning
Completely sealed, especially so that no air can enter or escape.
Example
The medicine was kept in a hermetic container.
C2 noun /praɪˈveɪʃən/

privation

Meaning
A state in which things essential for human well-being such as food and warmth are lacking.
Example
The refugees suffered great privation during the harsh winter.
C2 noun /rʌmp/

Rump

Meaning
the hindquarters or buttocks; the lower back area
Example
The horse injured its rump during the fall.
C2 adjective /juːˈbɪkwɪtəs/

ubiquitious

Meaning
Present, appearing, or found everywhere.
Example
Smartphones have become ubiquitous in modern society.
C2 noun /ˌriːkəˌpɪtjʊˈleɪʃən/

recapitulation

Meaning
The act of summarizing or repeating the main points of something.
Example
The professor gave a brief recapitulation of the lecture before ending the class.
C2 noun /maɪˈkrɒmɪtər/

micrometer

Meaning
A device used for measuring small distances with great accuracy.
Example
The engineer used a micrometer to measure the thickness of the wire.
C2 adjective /ˈpɪd.lɪŋ/

Piddling

Meaning
trivial; insignificant; small in amount
Example
He was annoyed by the piddling amount of money he received.
C2 adjective /ˌsuːpərˈnuːmərɛri/

supernumerary

Meaning
Exceeding the usual number; extra or unnecessary.
Example
The play included several supernumerary actors to fill the background scenes.
C2 adjective /ˌaɪdəˈlɑːtrɪəs/

idolatrious

Meaning
Excessively devoted or reverent towards idols or false gods.
Example
The ancient tribe was known for its idolatrious practices.
C2 noun /ˌɔːrnɪˈθɑːlədʒi/

ornithology

Meaning
the scientific study of birds
Example
She pursued ornithology to understand the migration patterns of birds.
C2 noun /dɪˈpɔːrtmənt/

deportment

Meaning
A person's behavior or manners, especially in a formal situation.
Example
Her deportment during the ceremony impressed everyone.
C2 noun /ˈɛdi/

eddy

Meaning
A circular movement of water, air, or smoke, counter to the main current, causing a small whirlpool or turbulence.
Example
The canoe was caught in an eddy near the rocks.
C2 noun /ˈhɒdʒ.pɒdʒ/

hodgepodge

Meaning
A confusing mixture of different things; a jumble.
Example
The essay was a hodgepodge of unrelated ideas.
C2 adjective /prɪˈhɛnsɪbəl/

prehensible

Meaning
capable of being grasped or seized
Example
The tool has a prehensible handle that improves safety.
C2 noun /ˈhelmz.mən/

Helmsman

Meaning
a person who steers a ship or boat; the person at the helm of a vessel
Example
The experienced helmsman skillfully guided the yacht through the narrow channel during the storm.
C2 noun

Kinsfolk

C2 noun /ˌiː.kəʊ.tɒkˈsɪ.kə.lə.dʒi/

ecotoxicology

Meaning
The study of the effects of chemical pollution on the environment.
Example
Ecotoxicology studies the effects of pesticides on wildlife.
C2 verb /ˈmʌfəl/

muffle

Meaning
to make a sound quieter or less distinct; to cover or wrap something to reduce noise or warmth
Example
She tried to muffle her laughter with a scarf.
C2 noun ˌɒbfəsˈkeɪʃən

obfuscation

Meaning
The action of making something obscure, unclear, or unintelligible.
Example
The obfuscation of the data made it difficult to interpret.
C2 adjective /ˈflʌməksd/

flummoxed

Meaning
Completely confused or bewildered.
Example
He looked flummoxed after hearing the strange question.
C2 verb /fleɪ/

flay

Meaning
to strip off the skin of something or criticize severely
Example
The chef flayed the fish before cooking it.