costly
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B2 adjective /ˈkɔːstli/

costly

Meaning
expensive or causing a lot of money, time, or effort
Example
Their mistake proved to be very costly for the company.
C1 noun /ˈkɒnɪfər/

conifer

Meaning
a type of tree that bears cones and evergreen needle-like leaves, such as pine or fir
Example
The forest is dominated by conifers like pine and spruce.
B2 noun /ˈkoʊ.brə/

Cobra

Meaning
a venomous snake with a hood that can be spread when threatened
Example
The cobra raised its hood and hissed at the intruder.
C1 noun kəˈlæt.ər.əl

collateral

Meaning
Something pledged as security for repayment of a loan, to be forfeited in the event of a default.
Example
The bank requires collateral for loan approval.
B2 adjective /ˈklɪn.ɪ.kəl/

clinical

Meaning
Related to the observation and treatment of patients rather than theoretical study.
Example
The doctor conducted a clinical examination.
C1 verb /kənˈviːn/

convene

Meaning
to come together or assemble, especially for a meeting or formal gathering
Example
The board will convene tomorrow to discuss the new policy.
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.
B2 noun /ˈkænjən/

canyon

Meaning
A deep gorge, typically one with a river flowing through it.
Example
The Colorado River carved the Grand Canyon over millions of years.
A2 noun /kɔɪnz/

coins

Meaning
Flat, typically round pieces of metal issued by a government as money.
Example
He collected old coins from different countries.
B2 adjective /ˈsɪn.ɪ.kəl/

cynical

Meaning
Believing that people are motivated by self-interest; distrustful of human sincerity or integrity.
Example
She was cynical about the politician's promises.
C2 verb /ˈkɒndʒʊɡeɪt/

conjugate

Meaning
to list the different forms of a verb according to tense, person, and number
Example
Students are asked to conjugate the verb 'to be'.
C2 verb /kəˈraʊz/

carouse

Meaning
to drink and enjoy oneself noisily, often with others
Example
They stayed up all night to carouse after the victory.
C1 verb /kənˈspaɪər/

conspire

Meaning
to secretly plan with others to do something harmful or illegal
Example
They conspired to overthrow the government.
C1 noun ˈkɑːr.bən ˌsiː.kwəˈstreɪ.ʃən

carbon sequestration

Meaning
The process of capture and long-term storage of atmospheric carbon dioxide to mitigate or defer global warming.
Example
Forests play a key role in carbon sequestration.
B2 noun /ˌkɒn.tɪˈnjuː.ɪ.ti/

continuity

Meaning
the state of being continuous or connected; consistency over time
Example
Maintaining continuity in leadership is essential for organizational stability.
C2 noun /ˈkloʊtʃər/

cloture

Meaning
a procedure for ending a debate and taking a vote.
Example
The Senate invoked cloture to end the lengthy debate.
C1 adjective /ˈsiːs.ləs/

Ceaseless

Meaning
continuing without pause or interruption; endless
Example
The ceaseless rain lasted for three days.
C1 adjective /ˌʃoʊ.vəˈnɪs.tɪk/

chauvinistic

Meaning
Displaying or characterized by excessive or prejudiced loyalty or support, especially towards one's own gender or group.
Example
His chauvinistic attitude alienated many of his female colleagues.
C2 verb /kənˈvʌls/

convulse

Meaning
to shake violently; to suffer sudden involuntary contractions
Example
The patient convulsed during the seizure.
C1 verb /ˈkætəˌlaɪz/

catalyze

Meaning
To cause or accelerate a reaction or change.
Example
The new law catalyzed reforms across the sector.
B2 verb /ˈkɒntəmpleɪt/

contemplate

Meaning
to think deeply and carefully about something; to consider thoughtfully
Example
She sat quietly to contemplate her future plans.
C2 verb /ˈkæstreɪt/

castrate

Meaning
To remove the testicles of a male animal or human.
Example
The farmer castrated the young bulls to make them easier to manage.
B1 noun /ˈtʃɪl.i/

Chilly/Chilli

Meaning
noticeably cold; a hot-tasting pod of a variety of capsicum, used as a spice
Example
The chef added red chilli to make the curry spicier.
C2 verb /kəˈdʒoʊl/

cajole

Meaning
To persuade someone to do something by flattery or gentle urging.
Example
She managed to cajole her friend into joining the trip.
C2 noun /kɪˈrɒpədɪst/

chiropodist

Meaning
A healthcare professional who diagnoses and treats foot problems.
Example
The chiropodist treated her painful corns and calluses.
C1 noun /ˈkæpɪˌlɛri/

capillary

Meaning
a very thin blood vessel that connects arteries and veins
Example
Oxygen passes from the blood into tissues through capillaries.
C1 noun /ˈtʃʌk.əl/

Chuckle

Meaning
a quiet or suppressed laugh; to laugh quietly or with amusement
Example
He gave a soft chuckle when he heard the funny joke.
C1 noun /saɪˈteɪʃən/

citation

Meaning
a quotation from or reference to a book, paper, or author
Example
The research paper included a citation from Shakespeare.
B2 adjective ˌkɒntrəˈdɪktəri

contradictory

Meaning
Mutually opposed or inconsistent; containing elements that oppose each other.
Example
Their views on education are contradictory.
C2 adjective /kəˈrʌp.tə.bəl/

corruptible

Meaning
able to be morally or ethically corrupted
Example
He was known to be corruptible and often accepted bribes.
C2 noun /kəˈleɪʃən/

collation

Meaning
the act of collecting, comparing, and arranging in proper order
Example
The librarian spent hours on the collation of old manuscripts.
B2 adjective kənˈsaɪs

concise

Meaning
Brief and clearly expressed without unnecessary details.
Example
A concise speech is more impactful than a long one.
C1 noun /kəʊˈhiːʒən/

cohesion

Meaning
The action or fact of forming a united whole.
Example
The team showed excellent cohesion throughout the project.
C1 noun kənˈsɔː.ti.əm

consortium

Meaning
An association of several companies or organizations formed to undertake an enterprise beyond the resources of any one member.
Example
The consortium worked collaboratively to build the cable.
B1 noun /ˌkɒmpəˈzɪʃən/

composition

Meaning
the act of creating a piece of writing, music, or art; the way parts are arranged
Example
Her composition won first prize in the contest.
C1 noun /ˈtʃæplɪn/

chaplain

Meaning
A member of the clergy attached to a private chapel, institution, hospital, or military unit.
Example
The army chaplain offered prayers before the battle.
B2 noun /ˈklaɪ.mæks/

Climax

Meaning
the most intense, exciting, or important point of something; the highest or most intense point in a process
Example
The movie reached its climax during the final battle scene.
B2 noun/verb /ˈtʃɑːrtər/

charter

Meaning
a written document granting rights or privileges; to hire a vehicle or vessel for temporary use
Example
The company decided to charter a bus for the trip.
B2 verb /kənˈtɛnd/

contend

Meaning
to strive or compete for something; to assert earnestly
Example
Athletes from around the world contend for the championship.
B2 adjective ˌkɒn.trəˈvɜː.ʃəl

controversial

Meaning
Giving rise to public disagreement or heated discussion.
Example
The policy remains controversial.
A1 adjective /koʊld/

Cold

Meaning
having a low temperature; lacking warmth; unfriendly
Example
The cold winter wind made everyone shiver.
C2 noun /ʃəˈɡrɪn/

chagrin

Meaning
Distress or embarrassment at having failed or been humiliated.
Example
She left the room in chagrin after forgetting her lines.
C2 noun /ˌsɜːrkəmləˈkjuːʃn/

circumlocution

Meaning
the use of many words when fewer would do, especially to avoid stating something directly
Example
The politician's speech was filled with circumlocution.
A2 verb /kaʊnt/

count

Meaning
to determine the total number of something
Example
She carefully counted the money on the table.
C1 adjective, noun /ˈkɑːr.dɪ.nəl/

cardinal

Meaning
As an adjective: of prime importance; as a noun: a high-ranking Catholic clergyman or a type of bird.
Example
Honesty is a cardinal virtue in life.
B1 noun /ˈtʃæptər/

chapter

Meaning
A main division of a book or a period in someone's life.
Example
I just finished the first chapter of the novel.
B2 noun /kəmˈplaɪ.əns/

compliance

Meaning
The practice of conforming to rules, regulations, or laws; obedience to orders or instructions.
Example
Schools expect compliance with their rules and policies.
C1 noun /krəˈvæs/

crevasse

Meaning
a deep crack in a glacier or the earth’s surface
Example
The climbers carefully crossed the icy crevasse.
B2 adjective ˈkʌtɪŋ ˌɛdʒ

cutting-edge

Meaning
The most advanced or innovative; at the forefront of development.
Example
This company develops cutting-edge technology.
A2 adjective kɑːm

calm

Meaning
Not showing or feeling nervousness, anger, or other strong emotions; peaceful.
Example
The calm environment supports healing.
C1 noun /ˌkæm.əˈrɑː.dɚ.i/

camaraderie

Meaning
Mutual trust and friendship among people who spend a lot of time together.
Example
The camaraderie among teammates was inspiring.
B2 adjective /kənˈdɪʃ.ən.əl/

Conditional

Meaning
dependent on certain conditions; not absolute
Example
The job offer is conditional upon passing the background check.
C1 noun /ˌkɒn.təmˈpleɪ.ʃən/

contemplation

Meaning
The action of looking thoughtfully at something for a long time; deep reflective thought.
Example
She sat in contemplation before making her decision.
B1 noun /ˈkærɪdʒ/

carriage

Meaning
a vehicle, typically a four-wheeled one, used for transporting goods or people, especially in the past
Example
The royal family traveled in a beautiful carriage during parades.
B2 adjective /kəmˈpærətɪv/

Comparative

Meaning
involving comparison between two or more things; relative
Example
The study showed comparative results between different teaching methods.
B1 noun /ˈtʃɛərˌwʊmən/

chairwoman

Meaning
a woman who presides over a meeting, committee, or organization; a female leader of a board or council
Example
She was elected chairwoman of the company after years of experience.
A2 noun /ˈkænsər/

cancer

Meaning
A disease in which abnormal cells divide uncontrollably and destroy body tissue.
Example
Smoking is a leading cause of lung cancer.
C1 noun /klaʊt/

clout

Meaning
influence or power, especially in politics or business
Example
The businessman has a lot of political clout.
B2 noun /kəˈrɪkjələm/

curriculum

Meaning
The subjects comprising a course of study in a school, college, or university.
Example
The school updated its curriculum to include more digital literacy courses.
B1 verb /klæp/

clap

Meaning
To strike the palms of the hands together, usually to express approval or create a sharp sound.
Example
The audience began to clap loudly after the performance.
C2 noun /ˈkɔːfər/

coffer

Meaning
A strongbox or small chest for holding valuables, often used metaphorically for funds or financial reserves.
Example
The city's coffers were drained after the costly project.
C1 noun /ˈkæviˌæt/

caveat

Meaning
a warning or condition to be considered before taking action
Example
The proposal was accepted with one caveat.
C2 noun /ˈʃɑːrlətən/

charlatan

Meaning
a person who pretends to have knowledge or skills that they do not really possess; a fraud
Example
The so-called healer was exposed as a charlatan.
B1 noun /ˈklaɪ.mət/

climate

Meaning
The weather conditions prevailing in an area in general.
Example
Climate change impacts all regions globally.
B2 adverb /ˈtʃiːfli/

chiefly

Meaning
mainly; primarily
Example
The festival is celebrated chiefly by young people.
C2 noun /kəmˈpleɪsəns/

complacence

Meaning
a feeling of quiet pleasure or self-satisfaction, often without awareness of potential danger
Example
His complacence prevented him from noticing the risks.
B2 noun /kəmˈpɑːrt.mənt/

Compartment

Meaning
a separate section or division of a larger space, especially in a train
Example
We found seats in the first-class compartment.
C2 noun kəmˈpʌŋk.ʃən

compunction

Meaning
A feeling of guilt or moral scruple that prevents or follows the doing of something bad.
Example
He felt compunction after lying to his friend.
C1 noun /kliːk/

clique

Meaning
a small, exclusive group of people
Example
The students formed a clique that excluded others.
C1 noun/verb /kruːˈseɪd/

crusade

Meaning
a vigorous campaign for a social, political, or religious cause; to fight passionately for a cause
Example
She has been crusading for women's rights all her life.
B2 adjective kɒnˈtek.stju.əl

contextual

Meaning
Depending on or relating to the circumstances or setting; context-dependent.
Example
Contextual meaning changes depending on usage.
C2 noun /kəˈdɛnzə/

cadenza

Meaning
An elaborate solo passage in a piece of music, usually near the end.
Example
The pianist performed a brilliant cadenza before the final movement.
C2 noun /ˌkəʊ.əˈles.əns/

coalescence

Meaning
The process of coming together to form one mass or whole.
Example
The coalescence of different cultures creates diversity.
A2 verb ˈselɪbreɪt

celebrate

Meaning
To acknowledge a significant or happy day or event with a social gathering or enjoyable activity.
Example
Bangladesh celebrates Urban Planning Day on November 8.
B2 verb /ˈkɒnvɪkt/

convict

Meaning
to find someone guilty of a crime in a court of law
Example
The court convicted him of theft.
B2 noun /ˈklʌstər/

cluster

Meaning
a group of similar things or people positioned close together
Example
The grapes grew in a tight cluster.
B1 noun /tʃɪl/

Chill

Meaning
an unpleasant feeling of coldness; a feeling of fear or anxiety; to relax
Example
There was a chill in the air as autumn approached.
C2 adjective /kənˈdʒɛktʃərəl/

conjectural

Meaning
based on guesswork or incomplete evidence rather than certain knowledge
Example
His explanation was purely conjectural and lacked proof.
A2 noun ˈtʃælɪndʒ

challenge

Meaning
A call to take part in a contest or competition, especially a demanding or stimulating one; a task or situation that tests someone's abilities.
Example
Plastic pollution poses a significant challenge to global health.
C1 adjective /ˌkɒmprɪˈhɛnsəbl/

comprehensible

Meaning
able to be understood; intelligible
Example
The teacher explained the topic in a comprehensible way.
B2 noun /ˌkɑn.trəˈdɪk.ʃən/

Contradiction

Meaning
a combination of statements, ideas, or features which are opposed to one another; inconsistency
Example
There was a clear contradiction between his words and his actions.
B2 noun /ˈkæp.tɪv/

Captive

Meaning
a person who has been taken prisoner or an animal that has been confined
Example
The captive was held in a small cell for several months.
B2 noun /ˈkɒm.pɒ.stɪŋ/

composting

Meaning
The process of recycling organic waste into fertile fertilizer.
Example
Composting reduces waste and enhances soil fertility.
A2 adjective /ˈkjʊriəs/

curious

Meaning
Eager to know or learn something.
Example
The curious explorers asked questions about Antarctica.
C2 verb /kənˈsɪlieɪt/

conciliate

Meaning
to stop someone from being angry; to win over by friendly acts
Example
He tried to conciliate the angry customer with an apology.
B2 verb /kriːp/

creep

Meaning
to move slowly and quietly; to make someone feel uncomfortable
Example
She crept quietly up the stairs to avoid waking anyone.
B2 noun /ˈkɒm.ɪt/

Comet

Meaning
a celestial object consisting of ice and dust that develops a tail when approaching the sun
Example
Halley's Comet appears in the sky every 76 years.
B1 adjective /kəmˈbaɪnd/

combined

Meaning
formed by bringing together separate parts or elements
Example
The combined effort of the team led to success.
C1 adjective /ˈkʌlpəbl̩/

culpable

Meaning
deserving blame or responsibility for a wrongdoing
Example
The judge found him culpable for the accident.
A1 noun /kaʊ/

Cow

Meaning
a large farm animal kept for milk or meat
Example
The cow produces fresh milk every morning.
B2 noun /ˈkaʊntərˌpɑːrt/

counterpart

Meaning
a person or thing that corresponds to or has the same function as another
Example
The CEO met with his counterpart in the partner company.
C2 noun /ˈkɔːldrən/

caldron

Meaning
A large metal pot used for boiling liquids or cooking over an open fire.
Example
The witch stirred her potion in a bubbling caldron.
C2 noun /ˌkæt ə ˈnaɪn ˌteɪlz/

cat-o-nine-tails

Meaning
A whip with nine knotted cords, historically used for punishment.
Example
The sailor feared the cat-o-nine-tails more than the storm at sea.
C1 adjective /kɜːrt/

curt

Meaning
Rudely brief in speech or manner.
Example
His curt reply made everyone uncomfortable.
A2 noun /klaʊd/

Cloud

Meaning
a visible mass of condensed water vapour floating in the atmosphere above the ground
Example
Dark clouds gathered before the storm.
B2 noun /kənˈvɪk.ʃən/

conviction

Meaning
A firmly held belief or opinion.
Example
She spoke with conviction, making everyone believe her.
C1 adjective /kənˈdʒenɪtl/

congenital

Meaning
existing from birth, usually describing a disease or condition
Example
The child was born with a congenital heart defect.
C1 verb /tʃɑːr/

char

Meaning
To burn or scorch something so that it becomes blackened.
Example
The cook accidentally charred the steak.
B2 verb /ˈsɜːrkjəˌleɪt/

circulate

Meaning
to move continuously or freely through a closed system or area
Example
Air circulated freely in the open hall.
C1 verb /ˈkæp.saɪz/

capsize

Meaning
to overturn in the water
Example
The small fishing boat capsized during the storm.
B1 noun /ˈtʃɛərmən/

chairman

Meaning
the leader or head of a meeting, committee, or organization
Example
The chairman opened the meeting with a short speech.
C1 noun /kɔːr/

corps

Meaning
a branch of the military or a group organized for a specific purpose
Example
He joined the army corps after graduation.
B2 verb /ˈkærəktəraɪz/

characterize

Meaning
to describe or portray the distinctive features or qualities of someone or something
Example
The author characterizes the hero as brave and selfless.
C1 noun /ˌkɒn.stəˈleɪ.ʃən/

constellation

Meaning
a group of stars forming a recognizable pattern in the night sky
Example
Orion is one of the most famous constellations.
C1 adverb /ˈkrɒswaɪz/

Crosswise

Meaning
in the form of a cross; diagonally across
Example
Place the logs crosswise to build a stable fire.
C2 verb /ˌkaʊntərˈmænd/

countermand

Meaning
to revoke or cancel an order or command
Example
The general countermanded the previous orders immediately.
C1 adverb kəmˈpæktli

compactly

Meaning
In a closely packed or dense manner.
Example
Protons and neutrons are compactly arranged.
B2 adjective /kəmˈpʌlsəri/

compulsory

Meaning
Required by law or a rule; obligatory.
Example
Wearing seat belts is compulsory in most countries.
C2 verb /ˈkɒr.ʌ.skeɪt/

coruscate

Meaning
to sparkle or flash brightly
Example
The fireworks coruscated across the night sky.
C2 noun /kəˈkɒfəni/

cacophony

Meaning
A harsh, discordant mixture of sounds.
Example
The cacophony of horns made it impossible to concentrate.
B2 verb /kənˈsiːd/

concede

Meaning
to admit something is true or valid, often reluctantly
Example
She finally conceded that she was wrong.
B1 noun /ˌsɪvɪlaɪˈzeɪʃən/

civilization

Meaning
the stage of human social and cultural development and organization considered most advanced
Example
Ancient Egypt is known for its remarkable civilization.
B2 noun /ˈkloʊʒər/

closure

Meaning
the action or process of closing something, or the sense of finality or resolution.
Example
The closure of the company left many employees without jobs.
B2 noun ক্লাইম্যাটিক কন্ডিশন্স

climatic conditions

Meaning
The atmospheric or weather patterns of a particular region.
Example
Specific climatic conditions are required for snowfall.
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.
B2 adjective /ˈsɛl.əˌbreɪ.tɪd/

celebrated

Meaning
Widely known and praised; famous for an achievement.
Example
He is a celebrated author in the field of literature.
C2 adjective /koʊˈiːvəl/

coeval

Meaning
Having the same age, date of origin, or duration; contemporary.
Example
The philosopher was coeval with the rise of modern science.
A2 verb /kənˈtɪnjuː/

continue

Meaning
To keep happening, existing, or doing something without stopping.
Example
The rain will continue throughout the night.
C1 adjective /kənˈtɪn.ju.əl/

Continual

Meaning
happening repeatedly over a long period of time; constant and uninterrupted
Example
The continual noise from the construction site was very annoying.
B2 noun /ˈkrɪtɪk/

critic

Meaning
A person who judges the merits of something, especially art or literature
Example
The film critic praised the director's latest movie.
C2 noun /ˈsɛntɔːr/

centaur

Meaning
A mythological creature with the upper body of a human and the lower body of a horse.
Example
The centaur is a well-known figure in Greek mythology.