crevasse
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C1 noun /krəˈvæs/

crevasse

Meaning
a deep crack in a glacier or the earth’s surface
Example
The climbers carefully crossed the icy crevasse.
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 /ˈpleɪdʒərɪzəm/

plagiarism

Meaning
the practice of taking someone else's work or ideas and passing them off as one's own
Example
The student was expelled for committing plagiarism in his essay.
C1 adjective /ɪkˈstreɪ.ni.əs/

extraneous

Meaning
Not directly related or essential to the matter at hand; irrelevant.
Example
The editor removed extraneous details from the report.
C1 adjective /kɑːrˈnɪv.ər.əs/

Carnivorous

Meaning
feeding on other animals; meat-eating
Example
Lions are carnivorous animals that hunt other animals for food.
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 noun /rɛnˈdɪʃən/

rendition

Meaning
a performance or interpretation of a piece of art, music, or text
Example
The singer gave a moving rendition of the classic song.
C1 adjective /ˌeɪˈtɪpɪkəl/

atypical

Meaning
not representative of a type, group, or class; unusual or abnormal
Example
The doctor said it was an atypical case of the disease.
C1 noun /ˈrɛzɪn/

resin

Meaning
a sticky organic substance, usually secreted by plants, often used in varnishes or plastics
Example
The craftsman used natural resin to make the sculpture shine.
C1 noun /ɪnˈfjuːʒən/

infusion

Meaning
the act of introducing something into another; a drink made by steeping leaves or herbs in liquid
Example
She prepared a calming infusion of chamomile tea.
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 adjective /ɪnˈsteɪbəl/

instable

Meaning
not stable; liable to change, collapse, or fail; lacking firmness or reliability
Example
The instable political situation worried foreign investors.
C1 noun /ˌsæl.jʊˈteɪ.ʃən/

Salutation

Meaning
a greeting; an expression of goodwill
Example
The letter began with a formal salutation.
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 noun /ɪkˌsperɪˈmɛnteɪʃən/

experimentation

Meaning
The process of performing a scientific procedure to make a discovery, test a hypothesis, or demonstrate a known fact.
Example
Experimentation leads to groundbreaking products.
C1 verb /hɜːrl/

hurl

Meaning
To throw something with great force.
Example
The boy hurled a stone into the river.
C1 noun /ɪnˈkɒmpɪtəns/

incompetence

Meaning
Lack of ability, skill, or effectiveness in doing something.
Example
The project failed due to the manager’s incompetence.
C1 noun /kɑːɡ/

cog

Meaning
A tooth on the rim of a wheel or gear; metaphorically, a minor but necessary part of a larger system.
Example
He felt like just a small cog in a big machine.
C1 adjective /ˌrɛmɪˈnɪsənt/

reminiscent

Meaning
Tending to remind one of something; suggestive of something in the past.
Example
The smell of rain is reminiscent of my childhood in the village.
C1 noun /pɔl/

Pall

Meaning
a cloth spread over a coffin; a dark covering that creates a gloomy atmosphere
Example
A pall of smoke hung over the burning building.
C1 noun /ˈdɪs.ə.nəns/

dissonance

Meaning
Disagreement, lack of harmony, conflict between ideas or beliefs.
Example
The cultural dissonance created misunderstandings.
C1 adjective /ˈbaʊn.tɪ.fəl/

bountiful

Meaning
Large in quantity; abundant; generous in giving.
Example
The farmer was grateful for the bountiful harvest.
C1 noun /ˈlʊkaʊt/

lookout

Meaning
A place for watching; a person keeping watch.
Example
The guard kept a lookout for suspicious activity.
C1 noun /ˌəʊvərɪksˌplɔɪˈteɪʃən/

overexploitation

Meaning
The unsustainable use of natural resources at a rate that exceeds their ability to regenerate, leading to depletion and environmental degradation.
Example
Overexploitation of natural resources leads to environmental degradation.
C1 adjective /dæft/

daft

Meaning
Silly or foolish.
Example
It was a daft idea to go hiking without water.
C1 noun əˌkred.ɪˈteɪ.ʃən

accreditation

Meaning
The action or process of officially recognizing someone or something as having a particular status or being qualified to perform a particular activity.
Example
Accreditation ensures institutional credibility.
C1 adjective ɪˌlektrəʊmæɡˈnetɪk

electromagnetic

Meaning
Relating to both electricity and magnetism or their interaction.
Example
Electromagnetic forces repel protons.
C1 noun (plural of fungus) /ˈfʌndʒaɪ/

fungi

Meaning
a group of spore-producing organisms such as mushrooms, molds, and yeasts
Example
Fungi play an important role in breaking down organic matter in nature.
C1 verb /ɪmˈpɛər/

impair

Meaning
to weaken or damage something, especially a function or ability
Example
Smoking can impair your lung capacity.
C1 noun /moʊl/

Mole

Meaning
a small burrowing mammal with tiny eyes and soft fur
Example
The mole dug tunnels under the garden.
C1 noun /ˈderˌdevəl/

daredevil

Meaning
A person who enjoys doing dangerous or risky things.
Example
The stunt was performed by a famous daredevil.
C1 noun /teɪnt/

Taint

Meaning
a stain or mark that spoils something; corruption or contamination
Example
The scandal left a permanent taint on his reputation.
C1 verb /dɪˈpriːʃieɪt/

depreciate

Meaning
to reduce in value over time
Example
Cars tend to depreciate quickly in their first few years.
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 verb /ˈpɪlɪdʒ/

pillage

Meaning
to rob or plunder a place, especially during war
Example
The invading army pillaged the village and took all valuables.
C1 noun /draɪ ˈtʃɪl.i/

Dry Chilli

Meaning
dried chili peppers used as spice for adding heat to food
Example
The recipe calls for two dry chillies to make it spicy.
C1 noun /ˈpɒlɪɡɒn/

polygon

Meaning
a flat shape with three or more straight sides
Example
The artist drew a colorful polygon on the canvas.
C1 verb /ˈɪnstɪˌɡeɪt/

instigate

Meaning
To bring about or initiate an action, often something negative.
Example
He was accused of instigating the riot.
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 adjective /ˈtɛnəbl/

tenable

Meaning
able to be defended or maintained against attack or objection
Example
His argument was strong and tenable in court.
C1 adjective /ˈtæk.taɪl/

tactile

Meaning
Connected with the sense of touch; perceptible by touch or giving a sensation when touched.
Example
The tactile experience of the fabric was soft and smooth.
C1 adjective /ˈtɔːrtʃuəs/

tortuous

Meaning
Full of twists and turns; excessively complex or complicated.
Example
The tortuous mountain road made driving very difficult.
C1 noun /ˈdʒuː.və.naɪl/

Juvenile

Meaning
a young person below the age of adult criminal responsibility; relating to young people
Example
The juvenile court handles cases involving young offenders under eighteen.
C1 verb /ɪmˈpɛrɪl/

imperil

Meaning
To put in danger or at risk.
Example
Reckless driving can imperil the lives of others.
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 /ræmˈbʌŋk.ʃəs/

rambunctious

Meaning
boisterous, energetic, and difficult to control.
Example
The rambunctious children filled the house with noise.
C1 noun /ˈoʊ.mən/

Omen

Meaning
an event regarded as a sign of future good or bad luck
Example
Many people consider a black cat crossing your path a bad omen.
C1 adverb /ˌmæθəˈmætɪkli/

mathematically

Meaning
in a way that relates to mathematics; using numbers, formulas, or logical calculation
Example
The problem can be solved mathematically rather than by guesswork.
C1 noun /ˈɔːnɪŋ/

awning

Meaning
a sheet of canvas or material stretched on a frame to shelter a place from the sun or rain
Example
We sat under the awning to avoid the heavy rain.
C1 noun /ˌrɛkwɪˈzɪʃən/

requisition

Meaning
An official order laying claim to the use of property or materials; a formal demand or request.
Example
The manager submitted a requisition for new office supplies.
C1 adjective /ˈnɪmbəl/

nimble

Meaning
Quick and light in movement or thought.
Example
The dancer’s nimble steps impressed the audience.
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 adjective /ɪnˈflæməbəl/

Inflammable

Meaning
easily set on fire; flammable; combustible
Example
The inflammable material caught fire quickly.
C1 adjective /ɪmˈprɒbəbl/

improbable

Meaning
Not likely to be true or to happen.
Example
It seems improbable that he will arrive on time.
C1 adjective /dɪsˈhɑːrtənd/

Disheartened

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

exoplanet

Meaning
A planet that orbits a star outside the solar system.
Example
Astronomers have discovered thousands of exoplanets in the last decade.
C1 adjective /ˌmet.əˈbɒl.ɪk/

metabolic

Meaning
Relating to the chemical processes that occur within a living organism in order to maintain life.
Example
Regular exercise enhances metabolic efficiency.
C1 noun prɪˈsɪʒ.ən ˈæɡ.rɪ.kʌl.tʃər

precision agriculture

Meaning
The technique of conducting agricultural work using advanced technology.
Example
Precision agriculture optimizes resource use and increases efficiency.
C1 noun /aɪl/

isle

Meaning
A small island or peninsula, often poetic or literary.
Example
They spent their honeymoon on a beautiful tropical isle.
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 verb /əˈdʒuːdɪˌkeɪt/

adjudicate

Meaning
to make a formal judgment or decision about a problem or dispute
Example
The committee was formed to adjudicate disputes between the parties.
C1 adjective /səˈdɪs.tɪk/

sadistic

Meaning
Deriving pleasure from inflicting pain or suffering on others.
Example
The villain had a sadistic smile while hurting his enemies.
C1 adjective /stjuːˈpɛndəs/

stupendous

Meaning
extremely impressive; amazing in size, degree, or excellence
Example
The magician’s performance was simply stupendous.
C1 verb /dɪˈbɑːr/

debar

Meaning
To officially prevent someone from doing something.
Example
He was debarred from entering the competition due to cheating.
C1 noun /ˈfeɪvərɪtɪzəm/

favoritism

Meaning
the practice of giving unfair preferential treatment to one person or group
Example
The manager was accused of favoritism towards certain employees.
C1 noun /ˈjuːnɪsən/

unison

Meaning
Simultaneous performance or utterance of action or speech.
Example
The choir sang in unison.
C1 noun /krəˈʃɛndoʊ/

crescendo

Meaning
a gradual increase in loudness or intensity, especially in music
Example
The orchestra built to a powerful crescendo before the finale.
C1 noun/verb mælˈfʌŋk.ʃən

malfunction

Meaning
A failure to function normally or satisfactorily; a defect or breakdown.
Example
The engine malfunctioned due to overheating.
C1 noun /ˈæbət/

abbot

Meaning
The head of a monastery for monks.
Example
The abbot welcomed the visitors to the monastery.
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 /ˌnɒn ɪɡˈzɪstənt/

non-existent

Meaning
not real or not present; lacking existence
Example
The supposed evidence turned out to be non-existent.
C1 adjective /dɪˈmɒnstrətɪv/

demonstrative

Meaning
openly showing feelings, especially affection or emotion
Example
She was very demonstrative with her affection towards her friends.
C1 verb /mɔːl/

maul

Meaning
To wound or injure someone by scratching or tearing; to handle roughly.
Example
The bear mauled the camper in the forest.
C1 adjective /ˈseɪ.vər.i/

savory

Meaning
Having a pleasant salty or spicy taste; morally acceptable.
Example
The restaurant serves a variety of savory dishes.
C1 adjective /ʌnˈwɪtɪŋ/

unwitting

Meaning
Not aware of what is happening; done without realizing.
Example
She became an unwitting participant in the scam.
C1 noun /ˈeɪ.peks/

apex

Meaning
The highest point or peak of something; the top or summit.
Example
He reached the apex of his career.
C1 noun /ˈhɜːrbɪsaɪd/

herbicide

Meaning
A chemical substance used to kill unwanted plants, especially weeds.
Example
Farmers used herbicide to protect their crops from invasive weeds.
C1 adjective ˈpɪv.ə.təl

pivotal

Meaning
Of crucial importance in relation to the development or success of something else.
Example
Renewable energy plays a pivotal role in sustainability.
C1 verb /əˈluːd/

allude

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

Dismal

Meaning
gloomy; depressing; causing sadness or despair
Example
The weather was dismal with heavy rain and dark clouds.
C1 adjective /mʌnˈdeɪn/

mundane

Meaning
lacking interest or excitement; dull and ordinary
Example
She tried to escape her mundane routine by traveling.
C1 verb /ˈkɒŋɡrɪɡeɪt/

congregate

Meaning
to gather together in a group; to assemble
Example
People congregate in the town square every evening.
C1 adjective /ɪmˈplɔːzəbl/

implausible

Meaning
Not seeming reasonable or probable; unlikely to be true.
Example
The story she told was so implausible that no one believed her.
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 verb /əbˈsteɪn/

abstain

Meaning
To restrain oneself from indulging in or partaking of something.
Example
People often abstain from digital devices to enhance focus.
C1 noun /ˌɪnækˈtɪvɪti/

inactivity

Meaning
the state of not being active physically or mentally; lack of action
Example
Prolonged inactivity can negatively affect both physical and mental health.
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 verb /ˈdʒʌmbəl/

jumble

Meaning
to mix things together in a confused or untidy way
Example
Don't jumble all the papers together in one pile.
C1 noun /rɪˈmɪt.əns/

Remittance

Meaning
A sum of money sent in payment or as a gift.
Example
The country's economy benefits from expatriate remittance.
C1 verb /brɔɪl/

broil

Meaning
To cook food by direct heat, usually under a grill or over a fire.
Example
She broiled the chicken until it was golden brown.
C1 noun /ˈtres.pæs.ər/

Trespasser

Meaning
a person who enters someone's property without permission
Example
The security guard caught the trespasser climbing over the fence.
C1 verb /ˈlɪtɪˌɡeɪt/

litigate

Meaning
to engage in legal proceedings or take a dispute to court
Example
The company decided to litigate the contract dispute.
C1 adjective /ɪˈlʌstriəs/

illustrious

Meaning
Well known, respected, and admired for past achievements.
Example
She had an illustrious career in medicine.
C1 adverb /ˈfɪksɪdli/

Fixedly

Meaning
in a steady, unmoving manner; with intense concentration
Example
He stared fixedly at the painting.
C1 verb /ˈprɒpəɡeɪt/

propagate

Meaning
To spread or transmit an idea, belief, or information widely; also to reproduce in plants or animals.
Example
Scientists work to propagate the species in captivity.
C1 noun /ˈrɒstrəm/

rostrum

Meaning
A raised platform for speakers, performers, or leaders.
Example
The politician delivered a speech from the rostrum.
C1 noun /ˈpɛndjələm/

pendulum

Meaning
A weight suspended from a pivot so that it swings freely, often used to regulate clocks.
Example
The pendulum swung back and forth inside the clock.
C1 noun /ˈdʊr.i.ən/

Durian

Meaning
a large spiky tropical fruit known for its strong smell and creamy custard-like flesh
Example
Durian is known as the king of fruits in Southeast Asia despite its pungent odor.
C1 adjective /bəˈzɜːrk/

berserk

Meaning
Out of control with anger or excitement; wild or frenzied.
Example
The fans went berserk when their team won the championship.
C1 adjective /moʊv/

mauve

Meaning
a pale purple color with a grayish or bluish tinge
Example
She wore a beautiful mauve dress to the party.
C1 adjective /ˈhɑːrtˌrɛndɪŋ/

heartrending

Meaning
Causing great sadness or distress; very moving emotionally.
Example
The documentary showed heartrending scenes of war victims.
C1 noun /ˌɒk.sɪ.dʒɪˈneɪ.ʃən/

oxygenation

Meaning
The process of supplying or treating with oxygen.
Example
Deep breathing exercises improve oxygenation of the body.
C1 noun /səˈbraɪəti/

sobriety

Meaning
the state of being sober; self-restraint and seriousness
Example
He has maintained his sobriety for five years.
C1 noun /ɪˈmiːdiəsi/

immediacy

Meaning
The quality of bringing one into direct and instant involvement with something, giving rise to a sense of urgency or excitement.
Example
The immediacy of digital communication has reshaped business operations.
C1 noun /noʊm/

gnome

Meaning
a small mythical creature, often depicted as a bearded man living underground; also a figurine used in gardens
Example
The garden was decorated with a gnome statue.
C1 verb /ɪˈdʒɛkt/

eject

Meaning
to force someone or something out, usually from a place or position
Example
The referee had to eject the player for unsportsmanlike behavior.
C1 adjective /təˈren.ʃəl/

Torrential

Meaning
falling rapidly in copious streams; extremely heavy rainfall
Example
The torrential rain flooded the streets within hours.
C1 adjective /əˈdɛpt/

adept

Meaning
Very skilled or proficient at something.
Example
She is adept at solving complex mathematical problems.
C1 noun /ˌʌl.tɪˈmeɪ.təm/

Ultimatum

Meaning
a final demand or statement of terms, the rejection of which will result in retaliation
Example
The boss gave him an ultimatum: improve or be fired.
C1 noun /ˈfɪɡjərˌhɛd/

figurehead

Meaning
a nominal leader with no real power; a symbolic head
Example
The king was merely a figurehead with no real authority.
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 /ˈɒptɪkəl/

optical

Meaning
related to or used in seeing or sight
Example
The optical illusion fooled everyone at the exhibition.
C1 noun /ˈfiːtəs/

fetus

Meaning
an unborn or unhatched offspring in the womb or egg
Example
The doctor explained the development of the fetus during pregnancy.
C1 noun, adjective, verb /ʃæm/

sham

Meaning
something that is not what it appears to be; a false or fake thing; to pretend
Example
The deal turned out to be a sham.
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 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, verb /ɡliːm/

gleam

Meaning
a small or brief shining light; to shine softly
Example
A gleam of hope appeared in her eyes.
C1 noun /krʊk/

crook

Meaning
a dishonest person, especially a criminal
Example
The police finally caught the crook who had been stealing cars.
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 /əˈrɪs.tə.kræt/

Aristocrat

Meaning
a member of the aristocracy; a person of noble rank or birth
Example
The aristocrat lived in a magnificent castle.
C1 noun /brɛdθ/

breadth

Meaning
The distance or measurement from side to side; width; a wide range.
Example
The breadth of his knowledge impressed everyone.