caustic
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C1 adjective /ˈkɔː.stɪk/

caustic

Meaning
able to burn or corrode by chemical action; severely sarcastic
Example
Her caustic remarks hurt his feelings.
C1 noun /rɑk sɔlt/

Rock Salt

Meaning
natural salt crystals formed from evaporated ancient seas; unrefined salt
Example
Rock salt is considered healthier than table salt.
C1 verb /prɪˈkluːd/

preclude

Meaning
To prevent something from happening; to make impossible.
Example
Heavy rain precluded the possibility of a picnic.
C1 noun /ˈbɜːrθraɪt/

birthright

Meaning
A privilege or possession that a person has from birth.
Example
Freedom is considered a birthright of every individual.
C1 noun /ˈfɔːrˌbɛər/

forebear

Meaning
An ancestor, especially one who lived a long time ago.
Example
He often speaks of his forebears with great respect.
C1 noun /ˈrʌmpəs/

Rumpus

Meaning
a noisy disturbance; an uproar or commotion
Example
The children caused quite a rumpus in the playground.
C1 verb /ˈɛkstrɪkeɪt/

extricate

Meaning
To free someone or something from a constraint or difficulty.
Example
The firefighters extricated the passengers from the wrecked car.
C1 adjective /ˈfuːlpruːf/

foolproof

Meaning
Designed to be very easy to use or understand, leaving no possibility of failure or error.
Example
The new software has a foolproof installation process.
C1 verb /ˈsætəˌraɪz/

satirize

Meaning
to mock or criticize something using satire
Example
The play satirizes the greed of modern corporations.
C1 adjective /ˌjuːnɪˈsɛljʊlər/

unicellular

Meaning
Consisting of a single cell.
Example
Amoebas are unicellular organisms.
C1 verb /rɪˈmjuːnəreɪt/

remunerate

Meaning
To pay someone for services or work done.
Example
The company will remunerate employees fairly for their overtime.
C1 noun /ˈkoʊmə/

coma

Meaning
A deep state of prolonged unconsciousness caused by illness or injury.
Example
The patient remained in a coma for several weeks.
C1 adjective /dɪsˈhɑːrtənd/

Disheartened

Meaning
discouraged; feeling dejected; losing hope or confidence
Example
She felt disheartened after failing the exam twice.
C1 noun /ræθ/

Wrath

Meaning
extreme anger; intense fury or indignation
Example
His wrath was terrible to behold.
C1 noun /prəˈspɛktəs/

prospectus

Meaning
a printed document that advertises or describes a school, business, or investment offering
Example
The university sent out a prospectus to attract new students.
C1 noun /ˌɪməˈrælɪti/

immorality

Meaning
the quality of being immoral; behavior that violates accepted moral standards
Example
The community condemned the immorality of the corrupt officials.
C1 noun /ˌjuːθəˈneɪʒə/

euthanasia

Meaning
The practice of intentionally ending a life to relieve pain and suffering.
Example
The debate about euthanasia raises difficult ethical questions.
C1 verb /ɪɡˈnaɪt/

ignite

Meaning
To catch fire or cause to catch fire; to start or arouse.
Example
The sparks ignited the dry leaves in seconds.
C1 noun /ˈwɒrənt/

Warrant

Meaning
a legal document that gives police the authority to do something; justification or authority for an action
Example
The police obtained a search warrant before entering the building.
C1 noun /ˌpɜːrsɪˈkjuːʃn/

persecution

Meaning
the act of treating someone cruelly or unfairly because of their religion, race, or beliefs
Example
The persecution of minorities has been condemned worldwide.
C1 noun/verb /stæmˈpiːd/

stampede

Meaning
A sudden, uncontrolled rush of people or animals; to cause a mass movement.
Example
The loud noise caused a stampede of the crowd.
C1 noun /viˈoʊlə/ or /ˈvaɪələ/

viola

Meaning
A stringed instrument slightly larger than a violin, with a deeper and mellower tone.
Example
She chose to play the viola in the school orchestra.
C1 noun /ˈmævərɪk/

maverick

Meaning
An unorthodox or independent-minded person.
Example
The maverick scientist challenged established theories.
C1 adjective /pərˈvɜːrs/

perverse

Meaning
showing a deliberate desire to behave in a way that is unreasonable, contrary, or unacceptable
Example
He took a perverse pleasure in upsetting his colleagues.
C1 noun /ˈkærət/

karat

Meaning
A unit for measuring the purity of gold, with 24 karats being pure gold.
Example
The ring was made of 18-karat gold.
C1 adjective /ɪnˈsɪstənt/

insistent

Meaning
demanding something firmly and refusing to accept no
Example
The child was insistent on getting a new toy.
C1 noun ˌpraɪ.vɪ.taɪˈzeɪ.ʃən

privatization

Meaning
The transfer of a business, industry, or service from public to private ownership and control.
Example
The privatization of state-owned companies increased efficiency.
C1 noun ˈpɛd.ə.ɡɒ.dʒi

pedagogy

Meaning
The method and practice of teaching, especially as an academic subject or theoretical concept.
Example
Modern pedagogy focuses on student-centered learning.
C1 adjective /ˈæntɪkweɪtɪd/

antiquated

Meaning
Old-fashioned or outdated.
Example
The office still uses an antiquated filing system.
C1 adjective /ˈtɛmpərd/

tempered

Meaning
having a specified temper or disposition; strengthened or moderated.
Example
She gave a tempered response to the criticism.
C1 adjective /ˈluːdɪkrəs/

ludicrous

Meaning
so foolish, unreasonable, or out of place as to be amusing
Example
It is ludicrous to think the Earth is flat.
C1 noun /ˌnɑm.əˈni/

Nominee

Meaning
a person who is nominated for an office, award, or honor
Example
She was the nominee for the Best Actress award.
C1 noun /ˈɪnlɛt/

inlet

Meaning
A small arm of the sea, a lake, or a river; an opening or passage for entry.
Example
The boat entered a narrow inlet along the coast.
C1 noun /ˈnoʊmæd/

nomad

Meaning
A person who has no permanent home and moves from place to place.
Example
The desert was once home to nomads who lived by herding animals.
C1 adjective /ʌnˈtʌtʃəbəl/

Untouchable

Meaning
not able to be touched or affected; beyond criticism or attack
Example
The CEO seemed untouchable despite the scandal.
C1 adjective /əˈrɛstɪŋ/

arresting

Meaning
Attracting attention in a striking or impressive way.
Example
The actress gave an arresting performance.
C1 noun /slæɡ/

slag

Meaning
Stony waste matter separated from metals during the smelting process.
Example
The factory dumped the slag near the river.
C1 adjective /ˈsiːzənəbəl/

Seasonable

Meaning
occurring at the right time; appropriate for the season; timely
Example
The seasonable rain helped the farmers with their crops.
C1 noun ˈmaɪ.krəʊˌnjuː.tri.ənt

micronutrient

Meaning
Essential nutrients required by the body in small amounts, including vitamins and minerals.
Example
Iron and zinc are essential micronutrients for growth.
C1 adjective ˈwɛðərpruːf

weatherproof

Meaning
Able to resist or be unaffected by weather, especially rain and wind.
Example
The materials used are weatherproof, ensuring longevity.
C1 noun /ˌiː.kəˈnɒm.ɪk dɪˈspær.ɪ.ti/

Economic Disparity

Meaning
The unequal distribution of income and opportunity between different groups in society.
Example
Addressing economic disparity is crucial for social stability.
C1 noun /əˈbreɪʒən/

abrasion

Meaning
a scrape or wearing away of the skin or surface due to friction
Example
He suffered a minor abrasion on his knee after falling.
C1 adjective /ˈædʒɪteɪtɪd/

Agitated

Meaning
disturbed; anxious; restless; excited in a negative way
Example
He became agitated when he heard the bad news.
C1 noun /ˈkʌˈs.tə.di/

Custody

Meaning
the protective care or guardianship of someone or something; imprisonment or detention
Example
After the divorce, they shared custody of their children equally.
C1 adjective /ˈfæn.sɪ.fəl/

fanciful

Meaning
overimaginative, unrealistic, or whimsical
Example
The story was too fanciful to be true.
C1 adjective /ˈsiːs.ləs/

Ceaseless

Meaning
continuing without pause or interruption; endless
Example
The ceaseless rain lasted for three days.
C1 noun /ˌmiːtiəˈrɒlədʒi/

meteorology

Meaning
The scientific study of the atmosphere and weather.
Example
He chose to specialize in meteorology to study weather patterns.
C1 verb /əˈlʊər/

allure

Meaning
to attract or tempt someone with something desirable; to entice
Example
The beautiful garden allured visitors from far away.
C1 noun /ˈspɪnstər/

spinster

Meaning
An unmarried woman, often one who is older and considered unlikely to marry
Example
The novel featured a kind-hearted spinster who cared for the village children.
C1 noun /ˈɡræv.ɪ.tæs/

gravitas

Meaning
Dignity, seriousness, or solemnity of manner or speech.
Example
The judge spoke with great gravitas.
C1 noun /ˈʃæsi/

chassis

Meaning
the base frame of a vehicle or other wheeled machine
Example
The mechanic examined the car's chassis for damage.
C1 noun /læʃ/

Lash

Meaning
an eyelash; a sharp blow with a whip or rope; to strike forcefully
Example
She carefully applied mascara to make her lashes look longer and darker.
C1 noun /ˌtæm.bəˈriːn/

Tambourine

Meaning
a small drum with metal discs around the edge that jingle when shaken or hit
Example
She shook the tambourine to the rhythm of the music.
C1 verb /nəˈsɛsɪteɪt/

necessitate

Meaning
To make something necessary or unavoidable.
Example
The heavy rains necessitated the cancellation of the event.
C1 noun /ˈmætɪneɪ/

matinee

Meaning
A performance, especially a play or movie, that takes place in the afternoon.
Example
We bought tickets for the Sunday afternoon matinee.
C1 adjective /ˌmer.ɪˈtɔː.ri.əs/

Meritorious

Meaning
deserving reward or praise; commendable; worthy of recognition
Example
His meritorious service to the community was recognized.
C1 adjective səˈblaɪm

sublime

Meaning
Of such excellence, grandeur, or beauty as to inspire great admiration or awe.
Example
The sublime beauty of the mountain landscape took my breath away.
C1 noun /ˈɪnkjʊˌbeɪtər/

incubator

Meaning
a device or environment that provides suitable conditions for eggs, cells, or infants to develop
Example
The premature baby was placed in an incubator for care.
C1 noun /ˌæfəˈdeɪvɪt/

affidavit

Meaning
a written statement confirmed by oath or affirmation, used as evidence in court
Example
The witness submitted an affidavit to the court.
C1 verb /ˈɛm.ə.neɪt/

emanate

Meaning
To come out or spread from a source.
Example
A sweet fragrance emanated from the garden.
C1 adjective /ɪnˈθrɔː.lɪŋ/

enthralling

Meaning
Captivating and holding one's attention completely; fascinating.
Example
The movie was enthralling, keeping the audience engaged till the end.
C1 adjective /ˈswɛltərɪŋ/

sweltering

Meaning
uncomfortably hot
Example
The sweltering heat made it hard to work.
C1 verb /ɪnˈstɪl/

instill

Meaning
to gradually but firmly establish an idea, attitude, or habit in someone's mind
Example
Parents try to instill good values in their children.
C1 noun /ˈflɔː.rə/

flora

Meaning
The plant life found in a particular region or habitat.
Example
The Amazon rainforest is home to a vast flora diversity.
C1 noun /ɪnˈdɪrmənt/

endearment

Meaning
A word or phrase expressing affection or love.
Example
She whispered a gentle endearment to her child.
C1 noun moʊst ˈvʌlnərəbəl ˈneɪʃən

most vulnerable nation

Meaning
A country that is highly exposed to risks and lacks adequate protection or resilience.
Example
Bangladesh is one of the most vulnerable nations to climate change.
C1 noun /ˈaʊtriːtʃ/

outreach

Meaning
The act of providing services or support to people who might not otherwise have access to them.
Example
The charity launched a new outreach program for the homeless.
C1 adjective /spəˈrædɪk/

sporadic

Meaning
Occurring irregularly or in scattered instances rather than continuously.
Example
The region experienced sporadic rain showers throughout the week.
C1 adjective /ˌɪn.ɪˈfɛk.tʃu.əl/

ineffectual

Meaning
Not producing any or the desired effect; lacking the ability or qualities to achieve a purpose.
Example
The manager’s ineffectual leadership caused the team to lose motivation.
C1 adjective /ʌnˈvaɪəbl/

unviable

Meaning
Not capable of working successfully; not feasible or practical.
Example
The project was deemed unviable due to high costs.
C1 noun səˌsɛp.təˈbɪl.ə.ti

susceptibility

Meaning
The quality of being likely to be influenced or harmed by a particular thing; vulnerability.
Example
High susceptibility to infections requires extra care.
C1 noun /ˈpæʃ.ən ˌflaʊ.ər/

Passion flower

Meaning
A climbing plant with intricate, colorful flowers; also refers to royal poinciana tree with red-orange blooms
Example
The passion flower vine covered the garden wall with beautiful blooms.
C1 noun /ˈæbsɛs/

abscess

Meaning
A swollen area within body tissue containing pus, usually caused by infection.
Example
The dentist treated the abscess in his tooth.
C1 verb /spɔːn/

spawn

Meaning
to produce or generate, often in large numbers
Example
The video game has spawned many sequels.
C1 noun /ˌsæbəˈtɜːr/

saboteur

Meaning
A person who engages in sabotage.
Example
The saboteur was arrested before he could plant the bomb.
C1 noun /kəˈlæm.ɪ.ti/

Calamity

Meaning
an event causing great and often sudden damage or distress; a disaster
Example
The earthquake was a terrible calamity that affected thousands of families.
C1 adjective /ˈflaʊəri/

flowery

Meaning
Full of flowers or overly elaborate in style or language.
Example
She wrote a flowery letter filled with poetic phrases.
C1 noun /ˈstɛə.rɪ.əʊˌtaɪ.pɪŋ/

stereotyping

Meaning
A widely held but fixed and oversimplified image or idea of a particular type of person or thing.
Example
Stereotyping people based on their race is harmful.
C1 noun /ˈpeɪθɒs/

pathos

Meaning
a quality in speech, writing, or events that evokes pity or deep emotion
Example
The documentary balanced pathos with hope, making the audience both weep and think.
C1 adjective /ˈdɪs.ə.plɪ.ner.i/

Disciplinary

Meaning
relating to discipline; intended to correct behavior
Example
The company took disciplinary action against the employee.
C1 adjective /pəˈleɪ.ʃəl/

palatial

Meaning
resembling a palace in being spacious and splendid
Example
They stayed in a palatial hotel during their vacation.
C1 adjective ˈɒptɪmaɪzd

optimized

Meaning
Made as fully perfect, functional, or effective as possible; improved to achieve maximum efficiency.
Example
The system has been optimized for faster performance.
C1 noun /əˈsɪdɪti/

acidity

Meaning
the quality or degree of being acidic; the amount of acid present in a substance
Example
The acidity of the soil affects how well crops grow.
C1 noun ˌlaɪ.əˈbɪl.ə.ti

liability

Meaning
The state of being responsible for something, especially by law; a debt or financial obligation.
Example
The company's liabilities exceeded its assets.
C1 adjective /ˌɪnəˈfɛnsɪv/

inoffensive

Meaning
Not likely to offend or provoke; harmless.
Example
His inoffensive remarks kept the conversation friendly.
C1 verb, noun /mɛʃ/

mesh

Meaning
To fit or work together properly; or a material made of interlaced threads.
Example
The two gears mesh perfectly to keep the machine running smoothly.
C1 verb /ˈfɔːrfɪt/

forfeit

Meaning
to lose or give up something, usually as a penalty for wrongdoing
Example
He had to forfeit the match after breaking the rules.
C1 verb /ˌriːhəˈbɪlɪteɪt/

rehabilitate

Meaning
to restore someone to health, normal life, or a good condition after illness, injury, or imprisonment
Example
The clinic helps rehabilitate injured athletes.
C1 noun /eb/

Ebb

Meaning
the receding tide; a gradual decline or reduction
Example
The fishermen waited for the ebb before returning to shore.
C1 verb /θræʃ/

thrash

Meaning
to beat someone or something violently; to move wildly or violently
Example
The angry man threatened to thrash his opponent.
C1 adjective /ˌsækrɪˈfɪʃəl/

sacrificial

Meaning
Relating to or involving sacrifice.
Example
The lamb was used as a sacrificial offering in the ritual.
C1 noun /səˈbætɪkəl/

sabbatical

Meaning
A period of paid leave granted to a teacher or worker for study or travel, traditionally every seventh year.
Example
She took a sabbatical to research her new book.
C1 adjective /ˈtɜːrʃieri/

tertiary

Meaning
third in order, rank, or level
Example
He is pursuing his tertiary education at the university.
C1 adjective /ˈljʊərɪd/

lurid

Meaning
shocking or sensational in a vivid way, often involving crime or violence
Example
The newspaper published a lurid account of the crime.
C1 verb /ɪmˈpɪndʒ/

impinge

Meaning
to have an effect or impact on something; to encroach or infringe
Example
The noise from the construction site impinges on our daily activities.
C1 noun /pəˈpaɪrəs/

papyrus

Meaning
An ancient writing material made from the pith of the papyrus plant; also refers to the plant itself.
Example
The ancient scroll was written on papyrus.
C1 noun /ˈskæf.əld/

Scaffold

Meaning
a temporary structure used by workers to stand on when building or repairing something high; a platform for execution
Example
The workers erected a scaffold to paint the building's exterior.
C1 verb /ˈlɛvi/

levy

Meaning
To impose or collect, especially a tax or fine.
Example
The government decided to levy a new tax on luxury goods.
C1 noun /ˌɪnkəmˌpætəˈbɪlɪti/

incompatibility

Meaning
the state of being unable to exist or work together harmoniously; lack of compatibility
Example
The project failed because of incompatibility between the two software systems.
C1 noun /ˈmoʊldɪŋ/

molding

Meaning
A decorative strip or design, often used on walls, ceilings, or furniture.
Example
The wooden molding gave the room a classic look.
C1 adjective /tjuːˈmʌltʃuəs/

tumultuous

Meaning
Characterized by disorder, noisy excitement, or emotional agitation.
Example
They had a tumultuous relationship full of ups and downs.
C1 noun əˈtrɪʃ.ən

attrition

Meaning
The process of reducing something's strength or effectiveness through sustained attack or pressure.
Example
The company faced high employee attrition due to job dissatisfaction.
C1 noun /kəmˈpəʊ.ʒər/

composure

Meaning
The state or feeling of being calm and in control of oneself.
Example
She maintained her composure during the interview.
C1 noun /ˈmætrəˌmoʊni/

matrimony

Meaning
The state of being married; marriage.
Example
They entered into matrimony after years of friendship.
C1 adjective /koʊˈɜːrsɪv/

coercive

Meaning
Relating to or using force or threats to make someone do something.
Example
The government faced criticism for adopting coercive measures against protestors.
C1 noun /siˈɛrə klʌb/

Sierra Club

Meaning
An American environmental organization founded in 1892 by John Muir, focused on promoting conservation of the natural environment by influencing public policy decisions.
Example
John Muir founded the Sierra Club in 1892 to protect wild areas.
C1 adjective /ˌrɛprɪˈhɛnsəbl̩/

reprehensible

Meaning
Deserving strong criticism or blame.
Example
His dishonest actions were truly reprehensible.
C1 noun /ɔːˈtɒmətən/

automaton

Meaning
A machine that works automatically; also refers to a person who behaves like a machine, without thinking.
Example
He worked like an automaton, without showing any emotion.
C1 adjective /ɪkˈstɛnjueɪtɪŋ/

extenuating

Meaning
serving to make a fault or an offense seem less serious
Example
She asked for leniency due to extenuating circumstances.
C1 verb /ɪmˈpɒvərɪʃ/

impoverish

Meaning
To make someone poor or reduce the quality or richness of something.
Example
The long war impoverished the entire nation.
C1 noun /ˈhɔː.kər/

Hawker

Meaning
a person who travels about selling goods, typically from door to door or on the street
Example
The hawker sold fresh fruits from his cart.
C1 adjective /ˈfeɪt.fəl/

fateful

Meaning
having significant or disastrous consequences
Example
Their fateful decision changed the course of history.
C1 adjective ˌbjʊə.rəˈkræt.ɪk

bureaucratic

Meaning
Involving or characterized by complex rules and procedures that can delay the achievement of goals.
Example
Bureaucratic red tape often delays project approvals.
C1 noun /ˈaʊtpoʊst/

outpost

Meaning
A small military camp or position at some distance from the main force, used especially as a guard.
Example
The soldiers were stationed at a remote outpost.
C1 noun /blæk plʌm/

Black plum

Meaning
a dark purple or black colored edible fruit with sweet and sour taste
Example
I picked some fresh black plums from the tree in our backyard.
C1 noun /ˈmædʒɪstreɪt/

magistrate

Meaning
A civil officer who administers the law, often with limited judicial authority.
Example
The magistrate presided over the minor criminal case.
C1 adjective /ɪˈluːsɪv/

elusive

Meaning
Difficult to find, catch, or achieve; hard to understand or define.
Example
The solution to the problem proved elusive.
C1 adjective /ˈskrʌfi/

Scruffy

Meaning
untidy or unkempt in appearance; shabby and worn
Example
The scruffy old dog wandered through the streets looking for food.
C1 adjective /ˌprɛfəˈrɛnʃəl/

preferential

Meaning
showing or giving advantage to one over others
Example
Members receive preferential treatment at the club.
C1 verb /ɪnˈkæp.sjʊ.leɪt/

encapsulate

Meaning
To express the essential features of something succinctly; to summarize or contain within.
Example
The introduction should encapsulate the main points of the article.
C1 adjective /ˈnɔɪz.ləs/

Noiseless

Meaning
making no sound; completely silent
Example
She moved through the house in noiseless steps so as not to wake the baby.