corrosive
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C1 adjective /kəˈrəʊsɪv/

corrosive

Meaning
tending to cause corrosion; harmful or destructive to materials or people
Example
The chemical is highly corrosive and should be handled with care.
C1 adjective /ˈmɔːtəl/

Mortal

Meaning
subject to death; having a limited lifespan; human
Example
All human beings are mortal and will eventually die.
C1 noun /dɪˌlɪb.əˈreɪ.ʃənz/

deliberations

Meaning
Careful consideration and discussion before making decisions.
Example
Deliberations on sustainability continued for hours.
C1 adjective /ˈprevələnt/

Prevalent

Meaning
widespread; existing very commonly; generally occurring
Example
Smoking is still prevalent among teenagers despite health warnings.
C1 verb /sʌlk/

sulk

Meaning
to be silent and bad-tempered because you are angry or disappointed
Example
She sulked in her room after the argument.
C1 noun /ˈmɒd.ə.sti/

Modesty

Meaning
the quality of being humble and not boastful about achievements
Example
Despite his success, he showed great modesty.
C1 adjective /ʃruːd/

Shrewd

Meaning
having or showing sharp powers of judgment; astute
Example
The shrewd businessman made a profitable deal in the competitive market.
C1 verb /dəˈmɛstɪkeɪt/

domesticate

Meaning
to tame an animal for use by humans; to adapt something for domestic use
Example
Humans domesticated dogs thousands of years ago.
C1 noun /ˈtʃæriət/

Chariot

Meaning
an ancient horse-drawn vehicle used in warfare and racing
Example
The warrior rode his chariot into battle with great courage.
C1 adjective /ˌsɛlf əbˈzɔːrbd/

self-absorbed

Meaning
Excessively preoccupied with oneself and one’s own thoughts, feelings, or interests.
Example
He was too self-absorbed to notice his friend's distress.
C1 verb /ˈlɪkwɪdeɪt/

liquidate

Meaning
To sell assets in order to pay off debts; to close a business and convert assets into cash.
Example
The company decided to liquidate its assets to pay creditors.
C1 noun /ˈredʒ.ɪ.mən/

regimen

Meaning
A prescribed course of medical treatment, way of life, or diet for the promotion or restoration of health.
Example
A strict exercise regimen improves overall fitness.
C1 noun /naɪˈiːvɪti/

naivety

Meaning
The quality of being innocent, simple, and lacking experience or sophistication.
Example
Her naivety made her trust people too easily.
C1 noun /ˈplæn.teɪn ˈflaʊ.ər/

Plantain flower

Meaning
The flower bud of a banana plant, used as a vegetable in cooking
Example
We cooked plantain flower curry for dinner.
C1 verb /ˈbruːtəlaɪz/

brutalize

Meaning
to treat someone with extreme violence or cruelty; to make something harsh or cruel
Example
The regime was accused of brutalizing innocent civilians.
C1 noun /ˈmɪd.waɪf/

midwife

Meaning
A person, typically a woman, trained to assist women during childbirth.
Example
The midwife stayed with the mother throughout her labor.
C1 verb /ˈbɛkən/

beckon

Meaning
to signal or call someone to come closer, often with a gesture; to attract or invite
Example
She beckoned him to come closer with a wave of her hand.
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 noun /ˈmɛm.breɪn/

membrane

Meaning
A thin layer of tissue or material that covers, separates, or connects structures.
Example
The cell membrane controls the movement of substances in and out of the cell.
C1 noun /ˈpɔː.pəs/

Porpoise

Meaning
a small toothed whale with a low triangular dorsal fin and a blunt rounded snout
Example
The porpoise jumped gracefully out of the water.
C1 adjective /ɪnˈɡreɪnd/

engrained

Meaning
Firmly fixed or established; difficult to change.
Example
Cultural practices are often deeply engrained in the fabric of society.
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 ˌriː.pɚˈkʌʃ.ənz

repercussions

Meaning
The unintended consequences or effects of an action or event.
Example
The new policy had unintended repercussions on the economy.
C1 adjective /ˈpɜːrmiəbl̩/

permeable

Meaning
allowing liquids or gases to pass through
Example
The soil in this area is very permeable to water.
C1 noun /tɒŋ/

tong

Meaning
a tool with two movable arms used to pick up and hold objects
Example
He used the tong to pick up the hot coal.
C1 noun /ˈdʒɛntri/

gentry

Meaning
People of good social position, usually of high birth or wealthy landowners
Example
The gentry of the town gathered for the annual ball.
C1 adjective /frəˈnɛtɪk/

frenetic

Meaning
Fast and energetic in a wild or uncontrolled way.
Example
The stock market experienced frenetic trading after the announcement.
C1 verb /ɪkˈstræpəleɪtɪŋ/

extrapolating

Meaning
Extend the application of (a method or conclusion) to an unknown situation by assuming that existing trends will continue.
Example
Extrapolating from the current data, we can estimate the trends for next year.
C1 adjective /dɪˈmɛntɪd/

demented

Meaning
behaving irrationally due to mental illness or extreme excitement
Example
He looked demented after hearing the shocking news.
C1 noun ˈɛf.lu.ənt

effluent

Meaning
Liquid waste or sewage discharged into a river or the sea.
Example
Factory effluent contaminates nearby rivers and lakes.
C1 noun /dɪˈvɪnɪti/

divinity

Meaning
The quality or state of being divine; a deity.
Example
The priest spoke about the divinity of the soul.
C1 noun /ˈfɔːrmən/

foreman

Meaning
a person in charge of a group of workers, especially in a factory or construction site
Example
The foreman supervised the workers on the construction site.
C1 adjective /ˌmed.iˈiː.vəl/

Mediaeval

Meaning
relating to the Middle Ages; medieval
Example
The castle displayed mediaeval architecture and design.
C1 adjective /ˌaɪ.di.əˈlɒdʒ.ɪ.kəl/

ideological

Meaning
Relating to or based on a system of ideas or beliefs.
Example
The two parties are divided by deep ideological differences.
C1 verb /ˌriːˈmɒdəl/

remodel

Meaning
To change the structure or form of something, especially a building.
Example
They decided to remodel their kitchen last summer.
C1 adverb /əˈfrɛʃ/

afresh

Meaning
From the beginning, in a new way.
Example
After the failure, they started the project afresh.
C1 noun /ˌfəʊtəʊˈsɪnθɛtɪk ɪˈfɪʃənsi/

photosynthetic efficiency

Meaning
The measure of how effectively plants convert light energy into chemical energy through the process of photosynthesis, directly affecting plant growth and crop yield.
Example
Improving photosynthetic efficiency can increase crop yields.
C1 verb, noun /ˈflʌstər/

fluster

Meaning
to make someone agitated or confused
Example
The unexpected question flustered him.
C1 adjective /ˌtræn.senˈdɛn.təl/

transcendental

Meaning
relating to the spiritual or non-physical realm; surpassing ordinary experience
Example
Meditation can lead to transcendental experiences.
C1 adjective /ˌɑːpərˈtuːn/

opportune

Meaning
Happening at a suitable or convenient time.
Example
She arrived at an opportune moment to help.
C1 adjective /rɪˈsɔːrs ɪˈfɪʃ.ənt/

resource-efficient

Meaning
Using resources in a way that minimizes waste and maximizes productivity.
Example
Resource-efficient farming conserves water and energy.
C1 verb /iːk/

eke

Meaning
to make a small amount of something last longer by using it sparingly
Example
The family tried to eke out their savings during the tough months.
C1 adjective /ˈten.tə.tɪv/

Tentative

Meaning
not certain or fixed; provisional; hesitant or unsure
Example
We made tentative plans to meet next week.
C1 noun /kəˈres/

Caress

Meaning
a gentle or loving touch
Example
The mother's gentle caress calmed the crying baby.
C1 noun /ˌkɔːriˈɒɡrəfi/

choreography

Meaning
The art of designing and arranging dances and movements.
Example
The choreography of the ballet was breathtaking.
C1 adjective /ˌɪndɪˈspjuːtəbəl/

Indisputable

Meaning
impossible to deny or argue against; undeniable; certain
Example
The evidence against him was indisputable.
C1 adjective /əˈwɒʃ/

awash

Meaning
covered or flooded with water or something in large quantities
Example
The market was awash with cheap imported goods.
C1 verb /ədˈmɪnɪstreɪt/

administrate

Meaning
to manage or supervise the execution of duties, laws, or resources; to formally give or apply something such as a test or medicine
Example
The committee will administrate the new policy across all departments.
C1 verb koʊˈɜrs

coerce

Meaning
To force someone to do something against their will using threats or intimidation.
Example
The manager tried to coerce the employees into working overtime.
C1 adjective /ˈzoʊ.nəl/

Zonal

Meaning
relating to or arranged in zones; of, relating to, or having the form of a zone
Example
The city implemented a zonal parking system to manage traffic congestion.
C1 noun /rɪˈpraɪ.zəl/

Reprisal

Meaning
an act of retaliation; revenge taken for an injury or wrong
Example
The attack was carried out as a reprisal for the earlier bombing.
C1 noun /ˈmɔːr.nər/

Mourner

Meaning
a person who attends a funeral or shows grief for someone who has died
Example
The mourners gathered at the cemetery to pay their respects.
C1 verb /dɪˈbeɪs/

debase

Meaning
to reduce the quality, value, or dignity of something
Example
Corruption can debase the values of a society.
C1 adjective ˈser.ɪ.brəl

cerebral

Meaning
Of the cerebrum of the brain.
Example
Cerebral functions regulate thoughts.
C1 verb /ˈbædʒər/

badger

Meaning
To repeatedly ask or annoy someone with demands or questions.
Example
The reporter kept badgering the politician with questions.
C1 noun /ˈræʃən/

ration

Meaning
a fixed amount of something, especially food, officially allowed to each person
Example
During the war, each family received a weekly ration of rice.
C1 noun flɛər

flair

Meaning
A natural ability to do something well.
Example
She has a flair for design, always creating visually stunning work.
C1 verb /ɪnˈtɪmɪdeɪt/

intimidate

Meaning
To frighten or overawe someone, especially to make them do what one wants.
Example
The bully tried to intimidate the smaller kids.
C1 noun /maɪm/

Mime

Meaning
A performer who acts without words, using only gestures and body movements
Example
The street mime entertained the crowd with his invisible box routine.
C1 noun /ˈneɡ.lɪ.dʒəns/

Negligence

Meaning
failure to take proper care in doing something; carelessness
Example
The accident was caused by driver negligence.
C1 adjective /ˈwɪst.fəl/

Wistful

Meaning
having a feeling of longing or yearning; melancholy
Example
She gave a wistful smile when remembering her childhood days.
C1 verb /ˈbʌŋɡəl/

bungle

Meaning
To carry out a task clumsily or incompetently.
Example
He bungled the presentation and confused the audience.
C1 adjective /ɪˈrɛfjʊtəbəl/

Irrefutable

Meaning
impossible to deny or disprove; undeniable
Example
The evidence against him was irrefutable.
C1 noun /ɪnˈsæn.ə.ti/

Insanity

Meaning
the state of being seriously mentally ill; extreme foolishness or irrationality
Example
The defense lawyer argued that his client was not guilty by reason of insanity.
C1 adjective əˈblɪv.i.əs

oblivious

Meaning
Being completely unaware of surrounding events.
Example
He was oblivious to the noise around him while reading.
C1 noun /bʌm/

bum

Meaning
informal term for the buttocks; also a homeless or lazy person
Example
He sat on his bum all day doing nothing.
C1 noun ˈkiː.stəʊn ˈspiː.ʃiːz

keystone species

Meaning
A species on which other species in an ecosystem largely depend, such that if it were removed the ecosystem would change drastically.
Example
Wolves are a keystone species that regulate prey populations.
C1 noun /fjuːd/

feud

Meaning
a prolonged and bitter quarrel or conflict, often between families or groups
Example
The two families have been in a feud for generations.
C1 verb /spɜːrn/

spurn

Meaning
To reject something or someone with disdain or contempt.
Example
She spurned his offer of help.
C1 adjective /ˈkɜːrsəri/

cursory

Meaning
Hasty and therefore not thorough or detailed.
Example
He gave the report only a cursory glance before the meeting.
C1 noun /frɪˈvɒləti/

frivolity

Meaning
Lack of seriousness; silly or trivial behavior.
Example
The teacher discouraged frivolity during the exam.
C1 adjective /ˈsʌlən/

sullen

Meaning
bad-tempered and gloomy; silently resentful
Example
She gave him a sullen look and walked away.
C1 noun /jiːst/

Yeast

Meaning
microorganisms used in baking and brewing to cause fermentation
Example
Add yeast to the flour to make the bread rise.
C1 adjective /ˈɡʌl.ə.bəl/

gullible

Meaning
Easily deceived or tricked.
Example
She was so gullible that she believed every rumor.
C1 verb /ˈdʒɪtər/

jitter

Meaning
to shake or tremble slightly, often from fear, nervousness, or excitement
Example
He began to jitter nervously before giving his speech.
C1 adjective /ˈpær.ə.nɔɪd/

paranoid

Meaning
having an unreasonable fear or suspicion of others
Example
She became paranoid after hearing strange noises outside.
C1 noun /nɔːrm/

Norm

Meaning
a standard of behavior; what is typical or expected
Example
Working late has become the norm in this company.
C1 adjective /ɪmˈpɜːmiəbl/

impermeable

Meaning
Not allowing fluid or gas to pass through.
Example
The container is made of impermeable plastic.
C1 noun, adverb /ˈeɪliəs/

alias

Meaning
A false or assumed identity; also used to mean 'otherwise called'.
Example
The criminal was known by the alias 'Shadow'.
C1 noun ˈæltruɪzəm

altruism

Meaning
The belief in or practice of disinterested and selfless concern for the well-being of others.
Example
His altruism motivated others to volunteer.
C1 adjective /əbˈzɜːrvənt/

Observant

Meaning
quick to notice things; watchful; attentive
Example
The observant detective noticed every small detail at the crime scene.
C1 adjective /ˌʌndərˈsaɪzd/

undersized

Meaning
Smaller than the usual or expected size.
Example
The undersized puppy struggled to keep up with its siblings.
C1 adjective ʌnˈmætʃt

unmatched

Meaning
Not equaled or rivaled by any other; without equal.
Example
The freedom fighters showed unmatched bravery.
C1 noun ɪnˈsɛpʃən

inception

Meaning
The establishment or starting point of an institution or activity.
Example
The inception of the company marked a new era in the industry.
C1 noun /krʌks/

crux

Meaning
the most important or decisive point of an issue
Example
The crux of the problem lies in poor communication.
C1 adjective /ˌɪnkɒmprɪˈhɛnsəbl/

incomprehensible

Meaning
Impossible or very difficult to understand.
Example
The professor’s lecture was so fast it became incomprehensible.
C1 adjective /prɪˈpɒstərəs/

preposterous

Meaning
completely ridiculous or absurd; contrary to reason or common sense
Example
The idea that pigs could fly is preposterous.
C1 adverb /suːˈpɜːb.li/

Superbly

Meaning
in an excellent or outstanding manner
Example
She performed superbly in the dance competition.
C1 noun /ˈbʊl.ək/

Bullock

Meaning
a young bull; a castrated bull used for farm work
Example
The farmer used a bullock to plow the field.
C1 adjective /ˌkɒmprɪˈhɛnsəbl/

comprehensible

Meaning
able to be understood; intelligible
Example
The teacher explained the topic in a comprehensible way.
C1 adjective /ˈsɜːrpənˌtiːn/

serpentine

Meaning
Having the shape, movement, or qualities of a serpent; winding or twisting.
Example
The road took a serpentine path through the mountains.
C1 verb /sluː/

slew

Meaning
To turn or slide violently in a particular direction.
Example
The car slewed across the icy road.
C1 noun dɪˈfleɪʃən

deflation

Meaning
Reduction of the general level of prices in an economy.
Example
Deflation often leads to decreased consumer spending.
C1 adjective /rɪˈtɜː.nə.bəl/

Returnable

Meaning
able to be returned or given back
Example
The bottle is returnable for a deposit refund.
C1 noun /aɪ/

aye

Meaning
an affirmative vote or expression of agreement
Example
The committee voted aye on the proposal.
C1 verb /kənˈkɒkt/

concoct

Meaning
to make something, especially food or a story, by mixing or inventing
Example
He concocted a story to explain his absence.
C1 noun /ˈɔːtəkræt/

autocrat

Meaning
A ruler with absolute power.
Example
The autocrat controlled the country with an iron fist.
C1 verb /ɪnˈθjuːz/

enthuse

Meaning
to express excitement or admiration
Example
She enthused about her trip to Italy.
C1 noun /ˌsɛrənˈdɪpɪti/

serendipity

Meaning
The occurrence of events by chance in a happy or beneficial way.
Example
Finding that old photo album was pure serendipity.
C1 noun /ˌkɒndʒʊˈɡeɪʃən/

conjugation

Meaning
the variation of the form of a verb to indicate tense, person, and number
Example
French verbs have complex conjugations.
C1 noun /ˌkɒnfɪˈdɑːnt/

confidante

Meaning
A woman with whom one shares a secret or private matter, trusting her not to repeat it.
Example
The queen’s maid became her most trusted confidante.
C1 verb /əˈluːd/

allude

Meaning
To refer to something indirectly or casually.
Example
The professor alluded to Shakespeare during the lecture.
C1 adjective /ˈstɔːlwərt/

stalwart

Meaning
Loyal, reliable, and hardworking; strongly built or sturdy.
Example
She has always been a stalwart supporter of the community.
C1 noun /ʌnɪmˈpɔːrtəns/

unimportance

Meaning
the state or quality of being insignificant or not important
Example
He dismissed the issue with a sense of unimportance.
C1 noun /ˈkoʊhɔːrt/

cohort

Meaning
A group of people with a shared characteristic, usually of the same age or with a common experience.
Example
The study tracked a cohort of students over ten years.
C1 verb /məˈruːn/

maroon

Meaning
to leave someone trapped and isolated, especially on an island
Example
The sailors were marooned on a deserted island.
C1 noun /ˌɛkstrəˈdɪʃən/

extradition

Meaning
the official process of sending someone accused of a crime to another country or state
Example
The extradition of the suspect was delayed due to legal issues.
C1 noun /ˈnek.səs/

Nexus

Meaning
a connection or series of connections linking two or more things
Example
There's a clear nexus between education and economic development.
C1 verb /praɪ/

pry

Meaning
to look closely into something; to try to find out private information
Example
She tried to pry into her neighbor’s private life.
C1 verb /dɪsˈkwɑːlɪfaɪ/

disqualify

Meaning
to officially prevent someone from participating or being eligible
Example
The referee decided to disqualify the player for cheating.
C1 noun /əˌsæsɪˈneɪʃən/

assassination

Meaning
The act of killing someone important, often for political or ideological reasons.
Example
The assassination of the president shocked the nation.
C1 verb /ˈpæmpər/

pamper

Meaning
to treat with excessive care and attention; to spoil
Example
Parents often pamper their first child.
C1 verb /rɪˈklaɪn/

recline

Meaning
To lean or lie back in a relaxed position.
Example
She reclined on the sofa with a book.
C1 adjective /kənˈsɜːrtɪd/

concerted

Meaning
done with great effort, planned and performed together by multiple people
Example
The workers made a concerted effort to improve conditions.
C1 noun /ˈænərkɪst/

anarchist

Meaning
a person who believes in or promotes the absence of government or authority
Example
The anarchist group protested against state control.
C1 verb /əˈbeɪt/

abate

Meaning
to become less intense or widespread
Example
The storm began to abate after midnight.
C1 verb /ˈteɪpər/

taper

Meaning
To gradually decrease in width, thickness, or intensity.
Example
The road tapers off as it reaches the mountains.
C1 verb /ˈhæɡəl/

haggle

Meaning
to argue about the price; to bargain persistently
Example
They haggled over the price for an hour.
C1 adjective /ˈraʊzɪŋ/

rousing

Meaning
Exciting, inspiring, or stirring.
Example
The speaker delivered a rousing speech that moved the audience.
C1 noun /ˈriːbeɪt/

rebate

Meaning
a partial refund given to someone who has paid too much money for something
Example
The store offered a rebate on bulk purchases.
C1 noun /ˈvenəm/

Venom

Meaning
a poisonous substance secreted by animals such as snakes; extreme malice and bitterness
Example
The snake's venom can be deadly if not treated quickly.