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C1 noun /ˈælɔɪ/

alloy

Meaning
A mixture of metals or a metal combined with another element.
Example
Bronze is an alloy of copper and tin.
C1 noun /ˌpændəˈmoʊniəm/

pandemonium

Meaning
Wild and noisy disorder or confusion; uproar.
Example
When the concert was canceled, pandemonium broke out among the crowd.
C1 adjective /ˌʌnəˈsjuːmɪŋ/

unassuming

Meaning
Not pretentious or arrogant; modest.
Example
Despite his success, he remained unassuming and humble.
C1 adjective /məˈlaɪn/

Malign

Meaning
evil in nature or effect; harmful; slanderous
Example
He spread malign rumors about his colleague.
C1 noun, adjective /dɪˈrɪvətɪv/

derivative

Meaning
Something that is based on another source; in math, a measure of how a function changes.
Example
The film was criticized for being too derivative of earlier works.
C1 noun ˌɪn.ɪˈfɪʃ.ən.si

inefficiency

Meaning
The state or quality of not achieving maximum productivity; failure to make the best use of time or resources.
Example
Government inefficiency leads to slow project completion.
C1 adjective /ˈmɜː.sɪ.ləs/

Merciless

Meaning
showing no mercy or pity; cruel and heartless
Example
The merciless dictator showed no compassion.
C1 noun /dɪˈfɛkʃən/

defection

Meaning
The act of abandoning one’s country, cause, or group in favor of another.
Example
The politician’s defection shocked his supporters.
C1 noun /kwoʊ/

quo

Meaning
The existing state of affairs or situation, often used in the phrase 'status quo'.
Example
He wanted to maintain the status quo at work.
C1 noun /ˈper.ɪ.wɪŋ.kəl/

Periwinkle

Meaning
a small trailing plant with violet-blue or white flowers
Example
Purple periwinkles covered the garden ground beautifully.
C1 noun /ˈdek.ə.dəns/

decadence

Meaning
Moral or cultural decline characterized by excessive indulgence in pleasure or luxury.
Example
The novel describes the decadence of the wealthy elite.
C1 exclamation /juˈriːkə/

eureka

Meaning
An exclamation used to express a sudden discovery or realization.
Example
When the solution finally came to him, he shouted, 'Eureka!'
C1 noun /ˈkɒnstənsi/

constancy

Meaning
the quality of being faithful and dependable
Example
Her constancy in friendship is admirable.
C1 verb /ˌɪntərˈsɛpt/

intercept

Meaning
to stop, catch, or seize something on its way from one place to another
Example
The police intercepted the stolen car before it crossed the border.
C1 noun /blaɪt/

blight

Meaning
A disease or condition that causes plants to wither; something that spoils or damages.
Example
The drought was a blight on the farmer’s crops.
C1 verb /koʊks/

coax

Meaning
to persuade someone gently or gradually to do something
Example
She managed to coax the cat out of the tree with some food.
C1 noun /ˈiː.zi tʃeər/

Easy-chair

Meaning
a comfortable chair with arms and a back that reclines
Example
He relaxed in his favorite easy-chair after work.
C1 noun /ˈhaɪndsaɪt/

hindsight

Meaning
Understanding of a situation only after it has happened.
Example
With the benefit of hindsight, we realized the decision was a mistake.
C1 adjective, adverb (informal, vulgar) /ˈfʌkɪŋ/

fucking

Meaning
used for emphasis, often expressing anger or frustration (vulgar slang)
Example
It was a fucking disaster!
C1 noun speɪst ˌrep.ɪˈtɪʃ.ən

spaced repetition

Meaning
A learning technique that involves reviewing information at increasing intervals to improve long-term retention.
Example
Spaced repetition helps in long-term memory retention.
C1 noun /ˈɛksələnsɪ/

excellency

Meaning
a title of honor for people of high rank, especially ambassadors or governors
Example
His Excellency the Ambassador attended the ceremony.
C1 verb /ˈnɪbəl/

nibble

Meaning
to take small bites of food
Example
The rabbit nibbled on a carrot.
C1 verb /əˈkleɪm/

acclaim

Meaning
to praise enthusiastically and publicly
Example
The audience acclaimed the actor for his outstanding performance.
C1 noun ˌkʌl.mɪˈneɪ.ʃən

culmination

Meaning
The highest or climactic point of something, especially as attained after a long time.
Example
The project reached its culmination after years of effort.
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 noun /ˈstɪmjʊlənt/

stimulant

Meaning
A substance that raises levels of physiological or nervous activity in the body.
Example
Coffee is a common stimulant that helps people stay awake.
C1 noun /ˈpraɪ.mər/ (US), /ˈprɪm.ər/ (UK)

primer

Meaning
A basic introductory book or a substance used to prepare a surface for painting.
Example
He read a primer on programming before starting his course.
C1 verb /klæsp/

clasp

Meaning
to grasp or hold tightly; also a device for fastening
Example
She clasped her hands together in prayer.
C1 noun ˌɪn.tuˈɪʃ.ən

intuition

Meaning
The ability to understand something immediately, without the need for conscious reasoning.
Example
Her intuition told her something was wrong.
C1 noun /ˈsteɪtəs kwoʊ/

status quo

Meaning
The existing state of affairs, especially regarding social or political issues.
Example
The government decided to maintain the status quo until further review.
C1 verb /diːˈfjuːz/

defuse

Meaning
To make a situation less dangerous, tense, or explosive; to remove a fuse from a bomb.
Example
The negotiator helped defuse the tense situation.
C1 adjective /vɪnˈdɪk.tɪv/

Vindictive

Meaning
having or showing a strong or unreasoning desire for revenge
Example
His vindictive behavior towards his former colleagues was unprofessional.
C1 adjective /ˈɜːr.θən/

Earthen

Meaning
made of earth or clay; relating to pottery or ceramic materials
Example
The kitchen had beautiful earthen pots for storage.
C1 adjective /ʌnˈkɛmpt/

unkempt

Meaning
Having an untidy or disheveled appearance.
Example
He looked unkempt after sleeping outdoors all night.
C1 adjective /ɪmˈpæʃənd/

impassioned

Meaning
Filled with or showing great emotion.
Example
She gave an impassioned speech about human rights.
C1 adjective /kənˈspɪkjuəs/

conspicuous

Meaning
Easily noticeable; attracting attention due to being unusual or prominent.
Example
Her red dress made her conspicuous at the party.
C1 noun sɜːrˈkeɪdiən ˈrɪðəm

circadian rhythm

Meaning
The body's natural sleep-wake cycle that occurs within 24 hours
Example
Exposure to natural light regulates the circadian rhythm.
C1 adjective /ˈroʊtəri/

rotary

Meaning
Relating to or characterized by rotation; revolving around an axis.
Example
The machine uses a rotary engine to function efficiently.
C1 adjective ˈsɛd(ə)ntəri

sedentary

Meaning
Characterized by much sitting and little physical activity.
Example
A sedentary lifestyle can lead to numerous health problems.
C1 noun /ˈswiːt.miːt/

Sweetmeat

Meaning
a small piece of confectionery or candy; a sweet delicacy
Example
The children enjoyed the traditional sweetmeats during the festival.
C1 verb /ˈstɪp.jʊ.leɪt/

stipulate

Meaning
to demand or specify a condition in an agreement or contract
Example
The contract stipulates that payment must be made within 30 days.
C1 noun ˌvɜː.səˈtɪl.ɪ.ti

versatility

Meaning
Ability to adapt or be adapted to many different functions or activities; having many different skills.
Example
His versatility made him successful in multiple fields.
C1 adjective /ɪnˈfɜːm/

infirm

Meaning
Weak, especially due to old age or illness.
Example
The infirm old man needed assistance to walk.
C1 adjective /ˈpjuːtrɪd/

putrid

Meaning
decayed and emitting a foul smell
Example
The garbage smelled putrid after days in the sun.
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 verb /dɪˈtɛst/

detest

Meaning
To dislike intensely or hate.
Example
I detest waking up early on weekends.
C1 noun /toʊm/

tome

Meaning
a large, heavy book, often scholarly or serious in nature
Example
She spent the afternoon reading an old tome on medieval history.
C1 noun /ɪnˈtɛstɪn/

intestine

Meaning
The part of the digestive system where food is digested and absorbed, extending from the stomach to the anus.
Example
The doctor explained how nutrients are absorbed in the small intestine.
C1 adjective /ˈbleɪmləs/

blameless

Meaning
innocent of wrongdoing; not deserving blame
Example
She remained calm and blameless throughout the investigation.
C1 verb /ɪˈloʊp/

elope

Meaning
to run away secretly in order to get married, especially without parental consent
Example
The young couple decided to elope to another city.
C1 verb /rænt/

rant

Meaning
to speak or shout in an angry, uncontrolled way
Example
He ranted about the unfair treatment at work.
C1 noun /ˌdɛrɪˈveɪʃən/

derivation

Meaning
The origin or development of something from a source.
Example
The derivation of the word comes from Latin.
C1 noun /prəʊˌkræs.tɪˈneɪ.ʃən/

procrastination

Meaning
The act of delaying or postponing tasks or activities.
Example
Procrastination is the enemy of success.
C1 adjective /əbˈnɒkʃəs/

Obnoxious

Meaning
extremely unpleasant; offensive; annoying
Example
His obnoxious behavior at the party annoyed everyone.
C1 noun /ˈɡrɪd.lɒk/

gridlock

Meaning
Complete traffic jam or standstill condition where vehicles cannot move.
Example
A major accident led to gridlock in the city center.
C1 adjective /ɪmˈpɜːrtɪnənt/

impertinent

Meaning
rude and showing a lack of respect
Example
It was impertinent of him to question the manager's decision.
C1 noun /ˈkɒndɪmənt/

condiment

Meaning
a substance such as salt, mustard, or ketchup that is used to add flavor to food
Example
Ketchup is a popular condiment in many countries.
C1 adjective /ˈʃɪvəlrəs/

chivalrous

Meaning
Behaving in a courteous, gallant, and honorable way, especially toward women.
Example
He was chivalrous, always opening doors for others.
C1 adjective /ˈpʌlməˌneri/

pulmonary

Meaning
relating to the lungs
Example
The patient suffered from a serious pulmonary infection.
C1 adjective /ˈsʌlən/

sullen

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

Goldsmith

Meaning
a person who makes or repairs articles of gold
Example
The goldsmith crafted a beautiful wedding ring.
C1 verb /dɪˈsɛm.ɪ.neɪt/

disseminate

Meaning
To spread or give out something, especially news, information, ideas, etc., to a lot of people.
Example
Social media helps to disseminate information quickly.
C1 noun /kənˈtentmənt/

contentment

Meaning
a state of happiness and satisfaction with what one has
Example
She felt a deep sense of contentment after helping others.
C1 adjective /ˈkrɪm.zən/

Crimson

Meaning
a deep purplish-red color
Example
The crimson sunset painted the sky with beautiful shades.
C1 verb /fɔːrˈkloʊz/

foreclose

Meaning
to take possession of a property due to the owner's failure to keep up mortgage payments
Example
The bank decided to foreclose on the property after months of missed payments.
C1 verb /ɡʌʃ/

gush

Meaning
to flow out suddenly and forcefully, or to express something enthusiastically
Example
Tears began to gush from her eyes.
C1 noun/verb /ˈhɛmərɪdʒ/

hemorrhage

Meaning
A significant loss of blood from a ruptured blood vessel, or to lose blood heavily.
Example
The patient suffered a severe brain hemorrhage.
C1 noun /prəˈpoʊnənt/

proponent

Meaning
a person who advocates for or supports a particular idea, cause, or plan
Example
She is a strong proponent of renewable energy.
C1 adjective /ˌwɛl tə ˈduː/

well-to-do

Meaning
Prosperous, wealthy, or financially comfortable.
Example
They belong to a well-to-do family in the city.
C1 adjective /ˈprɪvi/

privy

Meaning
having access to secret or private knowledge
Example
She was privy to the confidential discussions.
C1 noun /hɒˈstɪləti/

hostility

Meaning
hostile behavior; unfriendliness or opposition
Example
The negotiations ended in an atmosphere of hostility.
C1 adjective /ˈθrɪfti/

thrifty

Meaning
using money and resources carefully and not wastefully
Example
She is very thrifty and always saves money for the future.
C1 noun, verb /ˈbʌtrəs/

buttress

Meaning
a structure built against a wall for support; to support or strengthen
Example
The cathedral walls were buttressed to prevent collapse.
C1 noun /ˈskwɒlər/

squalor

Meaning
the state of being extremely dirty and unpleasant, especially due to poverty or neglect
Example
They lived in squalor without basic facilities.
C1 verb /ʃɜːrk/

shirk

Meaning
to avoid or neglect a duty or responsibility
Example
He always tries to shirk his responsibilities at work.
C1 adjective /præɡˈmæt.ɪk/

pragmatic

Meaning
Dealing with things sensibly and realistically in a way that is based on practical rather than idealistic considerations.
Example
He took a pragmatic approach to solving the financial crisis.
C1 noun /ˌɪndɪɡˈneɪʃən/

indignation

Meaning
Strong displeasure or anger caused by something unjust, offensive, or insulting.
Example
Public indignation grew after the unfair verdict.
C1 noun /ˈmɑː.kɪt ˌpen.ɪˈtreɪ.ʃən/

Market Penetration

Meaning
A measure of the amount of sales or adoption of a product or service compared to the total theoretical market for that product or service.
Example
High market penetration ensures competitive dominance.
C1 noun /ˈlænd.slaɪd/

Landslide

Meaning
a collapse of a mass of earth or rock from a mountain or cliff; an overwhelming victory in an election
Example
Heavy rains triggered a massive landslide that blocked the mountain highway.
C1 adjective /ˌdɪsɪnˈdʒɛnjʊəs/

disingenuous

Meaning
not candid or sincere; giving a false appearance of honesty or openness
Example
She gave a disingenuous excuse for missing the meeting.
C1 noun /ˈɪnkwest/

inquest

Meaning
A legal or official inquiry, especially into the cause of a death.
Example
The inquest revealed the cause of the accident.
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 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 adjective ˈɒk.sɪ.də.tɪv

oxidative

Meaning
Related to or caused by oxidation, especially cellular damage from free radicals.
Example
Excess stress can lead to oxidative damage in cells.
C1 noun /dɪˈlɪriəm/

delirium

Meaning
An acutely disturbed state of mind characterized by restlessness, illusions, and incoherence.
Example
The patient experienced delirium after the surgery due to the strong medication.
C1 adjective /kənˈdʒiːniəl/

congenial

Meaning
pleasant and friendly because of having similar interests or qualities
Example
They found the café a congenial place to meet and talk.
C1 adjective /ˈbɒt.əl ɡriːn/

Bottle-green

Meaning
a dark green color similar to that of a green glass bottle
Example
She wore a beautiful bottle-green dress to the evening party.
C1 noun /ˈpɛntəɡən/

pentagon

Meaning
A plane figure with five straight sides and five angles; also refers to the US Department of Defense building.
Example
The Pentagon is one of the most iconic government buildings in the United States.
C1 verb /fɔːrˈʃædoʊ/

foreshadow

Meaning
To indicate or suggest something that will happen in the future
Example
Dark clouds foreshadowed an approaching storm.
C1 noun /rɪˈpjuːt/

repute

Meaning
the opinion generally held of someone or something; reputation
Example
He is a scholar of great repute in his field.
C1 noun /ˈkɒləmnɪst/

columnist

Meaning
a journalist who regularly writes articles or opinions for a newspaper or magazine
Example
The columnist wrote an article about climate change.
C1 noun /ˌstætɪˈstɪʃən/

statistician

Meaning
A person who specializes in collecting, analyzing, and interpreting numerical data.
Example
The statistician presented the survey results with great clarity.
C1 adverb /rɪˈspek.tə.bli/

Respectably

Meaning
in a way that is worthy of respect; decently; properly
Example
She was dressed respectably for the interview.
C1 verb /dɪˈmiːn/

demean

Meaning
to cause someone to lose dignity or respect
Example
The manager demeaned his employees with rude remarks.
C1 adjective /ˌkævəˈlɪər/

cavalier

Meaning
showing a lack of proper concern; dismissive or offhand
Example
He had a cavalier attitude toward safety regulations.
C1 verb /rɪˈkuːpəreɪt/

recuperate

Meaning
to recover from illness or regain strength
Example
She went to the countryside to recuperate after surgery.
C1 verb /ˈkælɪˌbreɪt/

calibrate

Meaning
To adjust or mark something so it can be used accurately; to standardize.
Example
The technician calibrated the machine before starting the experiment.
C1 noun /ɔːˈdæs.ə.ti/

audacity

Meaning
The willingness to take bold risks; boldness or fearlessness.
Example
His audacity to question authority was admirable.
C1 noun /ˌmʌltɪˈplɪsɪti/

multiplicity

Meaning
A large number or variety of something.
Example
The project faced a multiplicity of challenges.
C1 adjective /ˈmeɪkˌʃɪft/

makeshift

Meaning
used as a temporary substitute; improvised
Example
They used boxes as a makeshift table.
C1 adjective /ˌfɪl.hɑːrˈmɒn.ɪk/

philharmonic

Meaning
relating to a symphony orchestra or its music
Example
The philharmonic orchestra performed a stunning rendition of Beethoven's Ninth Symphony.
C1 noun /ˈbærɪˌtoʊn/

baritone

Meaning
a male singing voice between tenor and bass
Example
The singer’s baritone voice impressed the audience.
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 verb /ˈstriːm.laɪn/

streamline

Meaning
To make a process simpler and more efficient.
Example
The company aims to streamline production to reduce costs.
C1 adjective /ˈtʃɛkərd/

chequered

Meaning
Having a pattern of squares, or marked by varied and contrasting experiences or periods.
Example
He had a chequered career with both great successes and failures.
C1 verb /ɪmˈpiːtʃ/

impeach

Meaning
To charge a public official with misconduct while in office.
Example
The parliament voted to impeach the president.
C1 noun /ˈpær.ə.saɪt/

Parasite

Meaning
an organism that lives on or in another organism and benefits at its expense; a person who depends on others
Example
The dog was treated for intestinal parasites.
C1 verb /ˈpætər/

patter

Meaning
to make a repeated light tapping sound; to talk quickly in a rehearsed or mechanical way
Example
Rain pattered softly on the window.
C1 adjective /ˈnɪp.i/

Nippy

Meaning
cold; chilly; quick and agile in movement
Example
It's quite nippy outside today, you should wear a jacket.
C1 verb /kənˈsaɪn/

consign

Meaning
to deliver something to a person or place, often for selling or safekeeping
Example
He consigned the package to the shipping company.
C1 noun /ˈɡreɪ.tər/

Grater

Meaning
a kitchen utensil with a rough surface for grating food into small pieces
Example
Use the grater to grate cheese for the pizza.
C1 noun /ˌloʊ.kəˈmoʊ.tɪv/

locomotive

Meaning
A powered rail vehicle used for pulling trains.
Example
The old steam locomotive was restored for the museum.
C1 adjective ˈdɔːn.tɪŋ

daunting

Meaning
Something that seems intimidating or challenging.
Example
The task seemed daunting, but she completed it successfully.
C1 adjective /əˈdɛpt/

adept

Meaning
Very skilled or proficient at something.
Example
She is adept at solving complex mathematical problems.
C1 adverb /ˈɒp.tɪ.məl.i/

optimally

Meaning
In the most effective or efficient way possible.
Example
Tasks should be allocated optimally for maximum output.
C1 adverb /ɪnˈvɜːrs.li/

Inversely

Meaning
in a way that is opposite or contrary; in reverse order or manner
Example
The price of goods is inversely related to their availability in the market.
C1 noun /ˈvæntɪdʒ/

vantage

Meaning
a position or situation that gives an advantage or a good view
Example
From this vantage, we could see the entire valley.
C1 verb /ˈsʌkɪŋ/

sucking

Meaning
Drawing in a liquid, air, or other substance through the mouth or a tube by creating a vacuum; also used figuratively for something unpleasant or ineffective
Example
The baby is sucking on a pacifier.
C1 adjective /ˈmɒnstrəs/

Monstrous

Meaning
extremely large; shockingly evil or wrong; abnormal or unnatural
Example
The monstrous crime shocked the entire community.
C1 noun /pəˈfjuː.mər.i/

perfumery

Meaning
the art, business, or products of making perfumes
Example
She works in a perfumery that creates luxury scents.
C1 noun /ˈpæn.θi.ən/

pantheon

Meaning
All the gods of a religion collectively; a building dedicated to all gods.
Example
The Roman Pantheon is one of the best-preserved ancient temples.