calculus
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C1 noun /ˈkælkjʊləs/

calculus

Meaning
A branch of mathematics concerned with rates of change and accumulation; also a hard mineral deposit in the body such as on teeth.
Example
Calculus is essential for advanced studies in physics and engineering.
C1 adjective /ˌhɔːrtɪˈkʌltʃərəl/

horticultural

Meaning
Relating to the art or practice of garden cultivation and management.
Example
She studied horticultural science at the university.
C1 adjective /əˈblaɪdʒɪŋ/

obliging

Meaning
Willing to help or do favors; accommodating.
Example
The staff at the hotel were very obliging and friendly.
C1 verb /ˈhɪpnətaɪz/

hypnotize

Meaning
to put someone into a state of hypnosis; to influence someone's mind deeply
Example
The magician tried to hypnotize the audience.
C1 noun /ˈtʃæs.tɪ.ti/

Chastity

Meaning
the practice of refraining from extramarital or premarital sexual relations; sexual purity
Example
Many religious traditions value chastity as a virtue of moral purity.
C1 noun ˌmɪs.kənˈsɛp.ʃən

misconception

Meaning
A wrong idea or false understanding about something.
Example
There is a common misconception that success happens overnight.
C1 adjective /tænˈdʒɛnʃəl/

tangential

Meaning
relating to or along a tangent; slightly or indirectly related to something
Example
His remarks were tangential to the main topic of discussion.
C1 adjective /ˈɜːrstwaɪl/

erstwhile

Meaning
former or in the past
Example
They were erstwhile friends but no longer speak.
C1 noun /ɑːˌtɪkjʊˈleɪʃən/

articulation

Meaning
The action of putting into words an idea or feeling of a specified type.
Example
His articulation during the debate impressed everyone.
C1 adverb /ˌwɛr.əˈpɒn/

whereupon

Meaning
Immediately after which; as a result of which.
Example
He confessed his mistake, whereupon she forgave him.
C1 verb ˈlæŋ.ɡwɪʃ

languish

Meaning
To remain in a state of neglect or decline for a long time without improvement.
Example
The project began to languish due to a lack of funding.
C1 noun /ɪˈpɪt.ə.mi/

epitome

Meaning
A perfect example of a particular quality or type; the best representation of something.
Example
She is the epitome of grace and kindness.
C1 noun /ɪˌreɡjəˈlærɪti/

irregularity

Meaning
lack of regularity or consistency; a deviation from what is normal, expected, or orderly
Example
The audit revealed several financial irregularities in the company’s records.
C1 noun /ˈfjuː.tʃə.rɪst/

futurist

Meaning
A person who studies or predicts the future, especially trends in science, technology, or society.
Example
The futurist predicted major changes in transportation within the next decade.
C1 noun /vʌlˈɡær.ɪ.ti/

Vulgarity

Meaning
the quality of being rude, offensive, or indecent; lack of sophistication or good taste
Example
The comedian's jokes were criticized for their vulgarity.
C1 verb dɪˈsaɪ.fɚ

decipher

Meaning
To convert something written in code into normal language; to succeed in understanding the meaning of something.
Example
It took hours to decipher the ancient script.
C1 adjective /ˈdrɪəri/

dreary

Meaning
dull, bleak, and lifeless; depressing
Example
The long, dreary winter made everyone feel gloomy.
C1 noun/verb /dɪsˈkwaɪət/

disquiet

Meaning
A feeling of worry or unease; to make someone feel anxious or uneasy.
Example
The strange silence filled the room with disquiet.
C1 verb /dʌb/

dub

Meaning
to give a name or label to something; to add a soundtrack to a film or recording
Example
The movie was dubbed into several languages for international release.
C1 adjective /ˈteɪn.tɪd/

Tainted

Meaning
contaminated or affected by something bad or undesirable
Example
The water supply was tainted with harmful chemicals.
C1 adverb /əˈtroʊʃəsli/

atrociously

Meaning
in a very cruel, shocking, or extremely bad manner
Example
The service at the restaurant was atrociously slow.
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 noun /ˌɪntərˈmiːdiˌɛri/

intermediary

Meaning
A person who acts as a link between people in order to try to bring about an agreement; a mediator.
Example
The diplomat served as an intermediary between the two conflicting nations.
C1 verb /slɪŋ/

sling

Meaning
to throw or hang something roughly or carelessly
Example
He slung his bag over his shoulder before leaving.
C1 noun /ˈzɪn.i.ə/

Zinnia

Meaning
A colorful garden flower with daisy-like blooms, popular for its vibrant colors and long-lasting nature
Example
The garden was filled with bright zinnias in various colors.
C1 noun/verb /ˈbɔɪ/ or /ˈbuːi/

buoy

Meaning
A floating marker on water; to keep something afloat or encourage someone.
Example
The news buoyed their spirits after the loss.
C1 noun /ˌkɑːr.diˈɒl.ə.dʒɪst/

cardiologist

Meaning
A doctor specializing in diagnosing and treating heart diseases.
Example
She made an appointment with a cardiologist for her chest pain.
C1 noun /ɪnˈdaɪtmənt/

indictment

Meaning
a formal charge or accusation of a serious crime
Example
The indictment accused the company of multiple violations.
C1 adjective /ɪˈneɪn/

inane

Meaning
lacking sense, meaning, or significance; silly or pointless
Example
The movie was criticized for its inane dialogue.
C1 noun /ˈdɪsɪdənt/

dissident

Meaning
A person who opposes official policy, especially that of an authoritarian state.
Example
The dissident was arrested for speaking against the government.
C1 verb /ɪnˈtrɛntʃ/

entrench

Meaning
To establish something so firmly that it is difficult to change.
Example
The company entrenched its position in the market through innovation.
C1 noun /pəˈrɪfəri/

periphery

Meaning
The outer edge or boundary of an area or object.
Example
The soldiers were stationed at the periphery of the camp.
C1 noun /ˈkwɒn.dər.i/

Quandary

Meaning
a difficult situation where you cannot decide what to do; dilemma
Example
She was in a quandary about which job offer to accept.
C1 verb /ˌriːɪmˈbɜːrs/

reimburse

Meaning
to pay back money to someone who has spent it or lost it
Example
The company reimbursed him for travel expenses.
C1 verb /ɛmˈbɛzəl/

embezzle

Meaning
to steal or misuse money or property entrusted to one's care
Example
The accountant was arrested for embezzling company funds.
C1 noun ˈmɑːrdʒɪnəlaɪzd ˌɪndɪˈvɪdʒuəlz

marginalized individuals

Meaning
People who are treated as insignificant or peripheral to society, often excluded from mainstream social, economic, or political activities.
Example
Marginalized individuals often face severe challenges.
C1 noun /ˈtæn.ər/

tanner

Meaning
A person whose job is to tan animal hides to make leather.
Example
The tanner worked long hours to produce fine leather.
C1 verb, noun /sæp/

sap

Meaning
As a noun: the vital fluid in plants; As a verb: to gradually weaken or drain strength.
Example
The long journey began to sap his energy.
C1 noun /ˈwɔː.tər ˌlɪl.i/

Water-lily

Meaning
a floating flower that grows on the surface of ponds and lakes
Example
The white water-lily floated gracefully on the pond.
C1 noun /səbˈdʒɛkʃən/

subjection

Meaning
the act of bringing someone or something under control or domination
Example
The people suffered under the subjection of a cruel ruler.
C1 adjective /ɪˈmeɪʃieɪtɪd/

emaciated

Meaning
Abnormally thin or weak, usually due to illness or lack of food.
Example
The emaciated dog was rescued from the abandoned house.
C1 adjective/adverb /ˌɒfˈhænd/

offhand

Meaning
Without previous thought or preparation; casual and sometimes dismissive.
Example
She gave an offhand reply to his serious question.
C1 adjective /ˈtɔːrtʃərəs/

torturous

Meaning
Extremely painful or causing great suffering; relating to or involving torture.
Example
The journey through the desert was long and torturous.
C1 noun /ˈhɛrəsi/

heresy

Meaning
belief or opinion that goes against established religious doctrine or accepted beliefs.
Example
In medieval times, heresy was often punished severely.
C1 adjective /ˈɪrɪtəbl/

irritable

Meaning
easily annoyed or made angry
Example
She became irritable after working long hours without rest.
C1 verb /ˈʃrɪvəl/

shrivel

Meaning
To become dry, wrinkled, and smaller due to lack of moisture.
Example
The flowers shriveled under the hot sun.
C1 noun /səbˈmɜːrdʒəns/

submergence

Meaning
the act or process of being submerged or going underwater
Example
The submergence of coastal areas is a major concern due to rising sea levels.
C1 verb /tʃæsˈtaɪz/

chastise

Meaning
to criticize or punish severely
Example
The teacher chastised the student for being late.
C1 adjective /ˈhɔː.ti/

Haughty

Meaning
arrogantly superior and disdainful; showing excessive pride
Example
She gave him a haughty look and walked away.
C1 adjective /kənˈtɪɡ.ju.əs/

contiguous

Meaning
sharing a common border; touching
Example
The two continguous houses shared a wall.
C1 adjective /əˈrɛstɪŋ/

arresting

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

overseer

Meaning
a person who supervises work or workers; a manager
Example
The overseer made sure the workers followed safety rules.
C1 adjective /ˌæbəˈrɪdʒənəl/

aboriginal

Meaning
Relating to the original inhabitants of a region.
Example
The museum has a large collection of aboriginal art.
C1 noun /ɪnˈfɜː.mə.ti/

Infirmity

Meaning
physical or mental weakness; a disease or ailment; frailty
Example
Despite his advanced age and various infirmities, he remained mentally sharp and alert.
C1 verb /rɪˈzaʊnd/

resound

Meaning
To fill a place with sound; to be celebrated or talked about widely.
Example
The hall resounded with applause.
C1 adjective /ˈpæs.ə.bəl/

passable

Meaning
good enough to be accepted, though not excellent
Example
The road is barely passable after the storm.
C1 verb /bɪˈmoʊn/

bemoan

Meaning
To express discontent or sorrow over something.
Example
Critics bemoaned the lack of diversity in the film.
C1 adverb /ˈhed ɑn/

Head-on

Meaning
directly facing; in direct confrontation or collision
Example
The two cars collided head-on at the intersection.
C1 verb /ˈdɛnɪˌɡreɪt/

denigrate

Meaning
to criticize unfairly; to belittle or disparage someone or something
Example
He was quick to denigrate the achievements of his colleagues.
C1 adjective /ˈstæɡ.nənt/

Stagnant

Meaning
not moving or flowing; showing no activity or development
Example
The stagnant water in the pond was covered with algae.
C1 noun /bruːˈtæləti/

brutality

Meaning
extreme cruelty or violence; savage or inhumane treatment
Example
The brutality of the attack shocked the entire community.
C1 noun /ˌɑːsɪˈleɪʃən/

oscillation

Meaning
The movement back and forth at a regular speed.
Example
The oscillation of the pendulum controls the clock.
C1 noun /ˈsɛtərə/

cetera

Meaning
Latin for 'the rest' or 'others'; commonly used in the phrase 'et cetera' meaning 'and so on'.
Example
We need to buy pens, paper, notebooks, et cetera.
C1 adjective /ˈnɔːʃəs/

nauseous

Meaning
feeling like you are about to vomit; causing a feeling of sickness
Example
The smell of rotten food made her feel nauseous.
C1 noun /ˈdæɡ.ər/

Dagger

Meaning
a short knife with a pointed blade used as a weapon
Example
The ancient warrior carried a silver dagger.
C1 adjective /ˈmiːɡər/

meager

Meaning
Lacking in quantity or quality; inadequate.
Example
He could barely survive on his meager salary.
C1 noun /tɪnt/

tint

Meaning
a slight shade or variation of a color
Example
The walls were painted white with a slight blue tint.
C1 adjective /ˌɪndɪˈskrɪmɪnət/

indiscriminate

Meaning
Done without careful judgment; random or haphazard.
Example
The indiscriminate use of pesticides harms the environment.
C1 noun /ˈɡriːvəns/

grievance

Meaning
A real or imagined cause for complaint, especially unfair treatment.
Example
The workers voiced their grievances to the management.
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 adjective /ˈbeɪs.ləs/

Baseless

Meaning
without foundation; groundless; unfounded
Example
The accusations against him were completely baseless.
C1 noun /tɪˈmɪdəti/

timidity

Meaning
lack of courage or self-confidence
Example
His timidity kept him from speaking up during the meeting.
C1 verb /sɪˈdjuːs/

seduce

Meaning
to attract someone into doing something, especially something they might not normally do
Example
The advertisement was designed to seduce customers into buying luxury products.
C1 adjective /ˈtækt.fəl/

Tactful

Meaning
showing skill and sensitivity in dealing with others or difficult situations
Example
He gave a tactful response to avoid hurting her feelings.
C1 noun /vəˈnɪər/

veneer

Meaning
A thin decorative covering of fine wood applied to a coarser wood or other material; a superficially attractive appearance.
Example
The table was covered with a thin veneer of mahogany.
C1 noun /kənˈveɪəns/

conveyance

Meaning
The action or process of transporting or carrying someone or something from one place to another.
Example
The conveyance of goods was delayed due to bad weather.
C1 adjective /ˌniːoʊˈlɪθɪk/

neolithic

Meaning
Relating to the later part of the Stone Age, when ground or polished stone weapons and tools prevailed.
Example
Neolithic communities began practicing agriculture and domesticating animals.
C1 verb /rɪˈpʌls/

repulse

Meaning
to drive back an attack or attacker by force; to cause intense dislike or disgust
Example
The army managed to repulse the enemy attack.
C1 adjective /ˈskɪtɪʃ/

skittish

Meaning
easily frightened or nervous; unpredictable
Example
The horse was too skittish to ride.
C1 noun /ˈded.lɑk/

Dead-lock

Meaning
a situation in which no progress is possible; complete standstill
Example
The negotiations reached a deadlock when neither side would compromise.
C1 verb /ˈbæfəl/

baffle

Meaning
to confuse; to be too difficult to understand
Example
The math problem baffles me completely.
C1 adjective /ɪnˈkwɪzɪtɪv/

inquisitive

Meaning
Curious or eager to learn and ask questions.
Example
The inquisitive child asked endless questions about the stars.
C1 noun /ˌkɒrəˈneɪʃən/

coronation

Meaning
the act or ceremony of crowning a sovereign or monarch
Example
The coronation of the new king was attended by thousands of people.
C1 adjective /ˌɔːtəˈkrætɪk/

autocratic

Meaning
Relating to a ruler who has absolute power and does not consult others.
Example
The manager’s autocratic style discouraged employees from sharing their ideas.
C1 adjective /ˈɛərˌtaɪt/

airtight

Meaning
Completely sealed so that no air can get in or out.
Example
Store the cookies in an airtight container to keep them fresh.
C1 verb /ˌkaʊntərˈbæləns/

counterbalance

Meaning
to offset or balance the effect of something
Example
Exercise can counterbalance the negative effects of stress.
C1 noun /ˌmæn.ɪ.fɛsˈteɪ.ʃən/

manifestation

Meaning
A visible form or expression of an idea, concept, or feeling; the action of displaying or showing.
Example
His generosity was a manifestation of his kind nature.
C1 noun /ˌmɪdˈsʌm.ər/

midsummer

Meaning
The middle of summer, often around the summer solstice in June.
Example
We had a festival to celebrate midsummer.
C1 noun /krʊk/

crook

Meaning
a dishonest person, especially a criminal
Example
The police finally caught the crook who had been stealing cars.
C1 verb /daɪˈvʌldʒ/

divulge

Meaning
to make known something private, secret, or previously unknown
Example
She refused to divulge the source of her information.
C1 noun /ˈleθ.ər.dʒi/

Lethargy

Meaning
a lack of energy and enthusiasm; tiredness and inactivity
Example
The hot weather caused a feeling of lethargy.
C1 noun /ˌævɒ̃ˈɡɑːrd/

avantgarde

Meaning
people or works that are innovative, experimental, and ahead of their time
Example
The avantgarde of the 20th century reshaped modern art.
C1 adverb /əˈlɒft/

aloft

Meaning
Up in or into the air; overhead.
Example
The kite was flying aloft in the clear sky.
C1 adjective /ˈkɒn.keɪv/

concave

Meaning
curved inward like the inside of a bowl
Example
The mirror had a concave surface that magnified her reflection.
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 noun /ɪˈlɛk.trəʊ.laɪts/

electrolytes

Meaning
Minerals in body fluids that carry an electric charge and are essential for many bodily functions.
Example
Electrolytes help maintain proper fluid balance in the body.
C1 adjective /dɪˈsɜːrnəbl/

discernible

Meaning
able to be seen, recognized, or understood
Example
There was a discernible change in his behavior.
C1 adjective /ɑːrˈkeɪn/

arcane

Meaning
understood by few; mysterious or secret
Example
The professor’s lecture was full of arcane details that only specialists could follow.
C1 noun ɪnˌvaɪ.rənˈmen.təl ˌtræns.fəˈmeɪ.ʃən

environmental transformation

Meaning
A significant change in environmental conditions or ecological systems.
Example
The city demonstrates environmental transformation.
C1 noun /oʊˈmɪʃ.ən/

Omission

Meaning
the action of excluding or leaving out someone or something; a failure to include
Example
The omission of his name from the list was intentional.
C1 noun /ˈɡreɪvstoʊn/

gravestone

Meaning
A stone that marks a grave, usually inscribed with the name of the deceased.
Example
The gravestone had her name carved beautifully.
C1 noun /oʊˈeɪ.sɪs/

Oasis

Meaning
a fertile spot in a desert where water is found; a pleasant refuge
Example
The travelers found an oasis after days in the desert.
C1 noun /ˈkɒl.ə.bəʊn/

Collar-bone

Meaning
either of the pair of bones joining the breastbone to the shoulder blades; clavicle
Example
He broke his collar-bone in the accident.
C1 noun /baʊt/

Bout

Meaning
a short period of intense activity of a specified kind; a wrestling or boxing match
Example
After a bout of illness, she finally recovered and returned to work.
C1 adjective /hɪpˈnɒtɪk/

hypnotic

Meaning
Producing sleep or a trance-like state; mesmerizing.
Example
The music had a hypnotic effect on the audience.
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 adjective /ˈɡɑːrdɪd/

guarded

Meaning
Cautious and careful in speech or action, often to avoid giving too much away.
Example
He gave a guarded reply to the journalist.
C1 noun /nɪˈɡeɪʃən/

negation

Meaning
The act of denying something; the contradiction or absence of something.
Example
The theory is built on the negation of traditional beliefs.
C1 adjective /ˈbɛndi/

bendy

Meaning
Easily curved or flexible.
Example
The bendy straw made it easier to drink from the cup.
C1 noun /ˈpælɪt/

pallet

Meaning
a flat wooden platform used for moving or storing goods; also a makeshift bed
Example
The boxes were stacked on a wooden pallet for easy transport.
C1 adjective /ˈɪnfəməs/

infamous

Meaning
well known for some bad quality or deed
Example
The dictator was infamous for his cruelty.
C1 noun /ˌprɒvəˈkeɪʃən/

provocation

Meaning
An action or statement that is intended to make someone angry or to cause a reaction.
Example
His rude comment was a clear provocation.
C1 verb /ˈɡlɔːrɪfaɪ/

glorify

Meaning
to praise or honor someone or something; to make something seem better than it is
Example
The movie glorifies war heroes.
C1 noun /ˈrɛ.trəʊ.fɪt.ɪŋ/

retrofitting

Meaning
The addition of new technology or features to older systems.
Example
The building underwent retrofitting to meet new safety standards.
C1 noun /ˈʃɪvəlri/

chivalry

Meaning
The medieval knightly system with its moral, social, and religious code; courteous behavior, especially toward women.
Example
The knight lived by the code of chivalry.
C1 adjective /ˈrʌɡ.ɪd/

Rugged

Meaning
rough and uneven; having a rough irregular surface; tough and strong
Example
The hikers crossed the rugged mountain terrain.
C1 noun ɪnˈsɒl.vən.si

insolvency

Meaning
The state of being unable to pay debts owed; bankruptcy.
Example
The company declared insolvency after years of losses.
C1 adjective /dɪsˈkwaɪətɪŋ/

disquieting

Meaning
Causing worry, unease, or anxiety.
Example
The news report was deeply disquieting to the public.
C1 noun /ˈæk.jʊ.mən/

acumen

Meaning
The ability to make good judgments and quick decisions; keenness and depth of perception.
Example
His business acumen helped the company grow rapidly.
C1 adjective /ˌiːvænˈdʒɛlɪkəl/

evangelical

Meaning
Relating to the Christian gospel, especially the teachings that emphasize personal faith and the authority of the Bible.
Example
She grew up in an evangelical church community.
C1 noun koʊˈhisɪv ˈjunɪts

cohesive units

Meaning
Groups or organizations that work together as unified wholes, with members closely bound together.
Example
Early humans formed cohesive units for survival.