delirium
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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 noun /plʊəˈrælɪti/

plurality

Meaning
the state of being multiple; the greater part or majority
Example
In the election, she won by a plurality of votes.
C1 adjective /lʌʃ/

lush

Meaning
rich, abundant, and luxurious, especially referring to vegetation
Example
The valley was filled with lush green fields.
C1 noun/verb /ˈætrəfi/

atrophy

Meaning
a decrease in size or wasting away of a body part, tissue, or ability due to lack of use
Example
Without regular exercise, muscles may atrophy over time.
C1 adjective /ˈmɜː.sɪ.fəl/

Merciful

Meaning
showing compassion or forgiveness; kind and forgiving
Example
The merciful judge gave him a lighter sentence.
C1 adjective /ˌɪndɪˈskrɪmɪnət/

indiscriminate

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

defeatist

Meaning
A person who expects or is excessively ready to accept failure; showing a tendency to expect defeat.
Example
His defeatist attitude discouraged the rest of the team.
C1 noun, adjective /ˌnɒn ˈrɛzɪdənt/

non-resident

Meaning
a person who does not live in a particular country or place permanently
Example
Non-resident students often pay higher tuition fees.
C1 adjective /ˈpleɪntɪv/

plaintive

Meaning
expressing sadness or sorrow
Example
He raised a plaintive cry for help.
C1 verb /ˌsuːpərɪmˈpoʊz/

superimpose

Meaning
to place one thing on top of another so that both can be seen
Example
The editor superimposed text over the image.
C1 noun /rɪˈvʌlʃən/

revulsion

Meaning
a strong feeling of disgust or repulsion
Example
She felt revulsion at the sight of the cruel act.
C1 verb /ˈiːvzdrɒp/

eavesdrop

Meaning
to secretly listen to a conversation
Example
She stood near the door to eavesdrop on their conversation.
C1 adjective /tjuːˈmʌltʃuəs/

tumultuous

Meaning
Characterized by disorder, noisy excitement, or emotional agitation.
Example
They had a tumultuous relationship full of ups and downs.
C1 noun /twɪndʒ/

twinge

Meaning
a sudden, sharp pain or an emotional pang
Example
He felt a twinge of guilt after lying to his friend.
C1 adjective /ˌɛɡzɪˈstɛnʃəl/

existential

Meaning
Relating to human existence, often concerning meaning or purpose of life.
Example
She went through an existential crisis during her midlife.
C1 noun, adjective /ˈsɒlvənt/

solvent

Meaning
a liquid that dissolves other substances; also means able to pay debts
Example
Acetone is a common solvent used in laboratories.
C1 noun /ˈmiːdieɪtər/

Mediator

Meaning
A person who attempts to make people involved in a conflict agree
Example
The United Nations often acts as a mediator in international disputes.
C1 noun /bəˈnɛv.ə.ləns/

benevolence

Meaning
The quality of being well meaning and kindly; the disposition to do good.
Example
His benevolence towards the poor earned him respect.
C1 adjective /ˈfræɡməntɪd/

fragmented

Meaning
Having been broken into fragments; disjointed or incomplete.
Example
The information was fragmented and difficult to understand.
C1 adjective ˈvɪdʒ.ɪ.lənt

vigilant

Meaning
Keeping careful watch for possible danger or difficulties; alert and watchful.
Example
The guards remained vigilant throughout the night.
C1 adjective /ˌʌnfɔːrθˈkʌmɪŋ/

unforthcoming

Meaning
Not willing to talk or provide information; uncooperative.
Example
The witness was unforthcoming about what he had seen.
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 noun/verb /ˈprɛdɪkət/ (noun), /ˈprɛdɪkeɪt/ (verb)

predicate

Meaning
noun: the part of a sentence that tells something about the subject; verb: to base or establish something on a particular idea
Example
His theory is predicated on sound research.
C1 noun/verb /fliːs/

fleece

Meaning
The woolly covering of a sheep; as a verb, to swindle or cheat someone.
Example
The farmer sheared the sheep’s fleece carefully.
C1 verb /əbˈsɛs/

obsess

Meaning
To preoccupy or fill the mind of someone continually and to an excessive degree.
Example
She tends to obsess over small details.
C1 noun /tækt/

tact

Meaning
Adroitness and sensitivity in dealing with others or with difficult issues.
Example
He handled the situation with tact and professionalism.
C1 noun ˌkæp.ɪ.təl.aɪˈzeɪ.ʃən

capitalization

Meaning
The total market value of a company's shares or the provision of capital for a company or activity.
Example
The company's capitalization reached $1 billion in market value.
C1 noun /dɪn/

din

Meaning
a loud, unpleasant, and prolonged noise
Example
The din of traffic outside made it hard to concentrate.
C1 adjective /ˌɪndɪˈskraɪbəbəl/

Indescribable

Meaning
impossible to describe or express in words; beyond description
Example
The beauty of the sunset was indescribable.
C1 noun /ˌtes.tɪˈmoʊ.ni.əl/

Testimonial

Meaning
a formal statement testifying to someone's character and qualifications
Example
The professor wrote a glowing testimonial for her former student.
C1 adjective /ɪɡˈzuːbərənt/

exuberant

Meaning
full of energy, excitement, and cheerfulness
Example
The children were exuberant after winning the game.
C1 noun /ˈɛləkwəns/

eloquence

Meaning
Fluent or persuasive speaking or writing.
Example
His eloquence in speech won him great respect.
C1 noun /ˈfɔː.nə/

fauna

Meaning
The animal life of a particular region, habitat, or geological period.
Example
The fauna of the African savannah includes lions and elephants.
C1 verb /luːt/

loot

Meaning
to steal goods, typically during war, riot, or chaos
Example
The rioters looted several shops during the protest.
C1 adjective /ˈaɪərnˌklæd/

ironclad

Meaning
impossible to change, break, or dispute; very strong and firm
Example
The company had an ironclad contract with its suppliers.
C1 verb /ɪmˈpiːtʃ/

impeach

Meaning
To charge a public official with misconduct while in office.
Example
The parliament voted to impeach the president.
C1 adjective /ˈtæn.tə.laɪ.zɪŋ/

Tantalizing

Meaning
tempting and attractive but out of reach
Example
The tantalizing aroma of fresh bread filled the bakery.
C1 verb /siːp/

seep

Meaning
to flow or leak slowly through small openings or pores
Example
Water began to seep through the cracks in the wall.
C1 verb /əˈskraɪb/

ascribe

Meaning
To attribute something to a cause, source, or person.
Example
Many scholars ascribe the poem to an unknown author.
C1 noun /ˌæŋɡloʊ ˈsæksən/

anglo-saxon

Meaning
A member of the Germanic peoples who settled in England in the early Middle Ages; also relating to their language or culture.
Example
The Anglo-Saxon period greatly influenced English culture and language.
C1 noun ɪkˌstræp.əˈleɪ.ʃən

extrapolation

Meaning
The action of estimating or concluding something by assuming that existing trends will continue.
Example
His extrapolation of market trends helped in financial planning.
C1 adjective /məˈtɪk.jə.ləs/

meticulous

Meaning
Extremely careful and precise in attention to detail
Example
A meticulous researcher checks every detail before publishing.
C1 adverb /ˌɪn.ədˈvɜːr.tənt.li/

Inadvertently

Meaning
without being aware of what you are doing; unintentionally; by mistake
Example
She inadvertently deleted the important file while cleaning her computer.
C1 adjective /praɪˈmiːvəl/

primeval

Meaning
Relating to the earliest ages in history; ancient and primitive.
Example
The explorers ventured into the primeval forest untouched by humans.
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.
C1 verb /kliːv/

cleave

Meaning
to split or divide; to cut through forcefully
Example
He used an axe to cleave the wood.
C1 verb /riːˈpeɪ.tri.eɪt/

repatriate

Meaning
To return someone to their own country, often after war or imprisonment.
Example
The government worked to repatriate the refugees safely.
C1 noun /ˈɛpɪθɛt/

epithet

Meaning
A descriptive phrase or word used to characterize someone or something, often as a nickname.
Example
He earned the epithet ‘The Great’ for his remarkable achievements.
C1 noun /ˈsɜːrmən/

sermon

Meaning
A religious discourse delivered by a preacher, often offering moral instruction or spiritual guidance.
Example
The pastor gave a moving sermon about compassion and forgiveness.
C1 verb /slɪŋk/

slink

Meaning
to move quietly and secretly, often to avoid being noticed
Example
The cat slunk into the room without making a sound.
C1 verb /trænˈskraɪb/

transcribe

Meaning
to make a written copy of spoken words or notes
Example
The secretary transcribed the meeting minutes.
C1 adjective /ˈvɛlvəti/

velvety

Meaning
having a smooth, soft texture like velvet
Example
She spoke in a low, velvety voice.
C1 adjective ˈek.wɪ.tə.bəl

equitable

Meaning
Fair and impartial
Example
Equitable AI ensures fairness in technology use.
C1 noun /mɪsˈɡɪvɪŋz/

misgivings

Meaning
feelings of doubt or concern about the outcome or propriety of something
Example
She had serious misgivings about signing the contract.
C1 adjective /swɑːv/

suave

Meaning
charming, confident, and elegant, often in a smooth or polished way
Example
He was a suave gentleman who impressed everyone at the party.
C1 noun /ˈmjʊr.əl/

Mural

Meaning
a painting or artwork applied directly on a wall or ceiling
Example
The artist painted a beautiful mural on the school wall.
C1 noun /ˈmæntl̩/

mantle

Meaning
A cloak or covering; also the layer of the earth between the crust and the core.
Example
The leader assumed the mantle of responsibility.
C1 adjective əʊˈpeɪk

opaque

Meaning
Not able to be seen through; not transparent; difficult to understand.
Example
The glass was too opaque to see through.
C1 noun ˌhaɪ.droʊˈpɒn.ɪks

hydroponics

Meaning
Growing plants using nutrient-rich water instead of soil.
Example
Hydroponics allows crops to grow without soil.
C1 noun /ˌsʌb.stɪˈtjuː.ʃən/

substitution

Meaning
the action of replacing someone or something with another
Example
The substitution of the old system with the new one was difficult.
C1 adverb /ˈiːstwədz/

Eastwards

Meaning
towards the east; in an eastern direction
Example
The river flows eastwards into the ocean.
C1 adjective /ɒmˈnɪv.ər.əs/

Omnivorous

Meaning
eating both plants and animals; feeding on various kinds of food
Example
Bears are omnivorous animals that eat both plants and meat.
C1 verb /dɪsˈfɪɡjər/

disfigure

Meaning
to spoil or damage the appearance of something
Example
The fire disfigured the old building.
C1 verb /səbˈmɜːrdʒ/

submerge

Meaning
to put under water or cover with liquid
Example
The floodwaters threatened to submerge the village.
C1 adjective /ˈrɪkɪti/

rickety

Meaning
Poorly made and likely to collapse; shaky.
Example
They crossed a rickety wooden bridge over the river.
C1 verb, noun /ˈbrɪsəl/

bristle

Meaning
to react angrily or defensively; a short stiff hair or fiber
Example
The cat bristled when it saw the dog.
C1 noun /joʊk/

Yoke

Meaning
a wooden crosspiece that is fastened over the necks of two animals and attached to a plow or cart; a burden or oppressive situation
Example
The oxen were joined by a wooden yoke.
C1 adjective /ɡɔːnt/

gaunt

Meaning
extremely thin, bony, and haggard in appearance, often due to hunger or illness
Example
After weeks of illness, he looked pale and gaunt.
C1 noun ˈsʌfrɪdʒ

suffrage

Meaning
The right to vote in political elections; the principle of political representation.
Example
Universal suffrage was a key demand.
C1 adjective /ɪɡˈzæspəˌreɪtɪd/

exasperated

Meaning
greatly annoyed or irritated
Example
She gave him an exasperated look after his repeated mistakes.
C1 noun /prəˈtruːʒən/

protrusion

Meaning
Something that sticks out or projects from a surface.
Example
The protrusion on the wall made it difficult to move the furniture.
C1 noun ˌnæn.oʊ.tekˈnɒl.ə.dʒi

nanotechnology

Meaning
The branch of technology that deals with dimensions and tolerances of less than 100 nanometers.
Example
Nanotechnology is advancing medical treatments.
C1 noun /ˌdez.ɪɡˈneɪ.ʃən/

Designation

Meaning
the action of choosing someone for a position; a name, title, or official status
Example
His designation as team leader came with additional responsibilities and authority.
C1 verb /ɪnˈvoʊk/

invoke

Meaning
to call upon a higher power, authority, or principle for help, support, or justification
Example
The lawyer invoked the constitution to defend his client.
C1 verb /ˌdɪsɪmˈbɑːrk/

disembark

Meaning
To leave a ship, aircraft, or other vehicle.
Example
The passengers disembarked from the plane after landing.
C1 adjective /ˈtɒp.məʊst/

Topmost

Meaning
highest in position or rank
Example
The flag was placed on the topmost branch of the tree.
C1 adjective /ˌæl.truˈɪs.tɪk/

altruistic

Meaning
Showing a disinterested and selfless concern for the well-being of others.
Example
Her altruistic nature led her to volunteer for charities.
C1 adjective /miːk/

Meek

Meaning
gentle and submissive; humble; patient
Example
Despite his power, he remained meek and humble.
C1 adjective /ɪˈluːsɪv/

elusive

Meaning
Difficult to find, catch, or achieve; hard to understand or define.
Example
The solution to the problem proved elusive.
C1 noun /ˈvendʒəns/

Vengeance

Meaning
punishment inflicted or retribution exacted for an injury or wrong; revenge
Example
He swore to seek vengeance against those who wronged him.
C1 noun /ˈɡæloʊz/

gallows

Meaning
A structure used for hanging criminals who have been sentenced to death.
Example
The criminal was led to the gallows at dawn.
C1 adjective /ˈɪrɪtəbl/

irritable

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

taper

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

Lime stone

Meaning
a hard sedimentary rock, composed mainly of calcium carbonate or dolomite, used as building material and in the making of cement
Example
The ancient building was made of limestone blocks.
C1 noun /vɪnˈjɛt/

vignette

Meaning
A short, descriptive piece of writing or a brief scene.
Example
The author included a poignant vignette in the introduction of the book.
C1 noun /ˈɔr.ə.kəl/

Oracle

Meaning
a person regarded as a source of wise counsel; in ancient times, a priest or priestess acting as a medium
Example
The ancient Greeks consulted the oracle at Delphi.
C1 noun /ˈslændər/

Slander

Meaning
the action of making false spoken statements damaging to someone's reputation
Example
The politician sued the newspaper for slander.
C1 noun ˌæprɪˈhɛnʃən

apprehension

Meaning
Anxiety or fear that something bad or unpleasant will happen.
Example
There is an apprehension about the depletion of fish stocks.
C1 adjective /dæft/

daft

Meaning
Silly or foolish.
Example
It was a daft idea to go hiking without water.
C1 verb /əˈbriːvieɪt/

abbreviate

Meaning
To shorten a word, phrase, or text by leaving out letters or parts.
Example
We often abbreviate 'Doctor' to 'Dr'.
C1 verb /ˈtɑːtər/

totter

Meaning
To move unsteadily, as if about to fall; to be on the point of collapse.
Example
The old man tottered across the street with a cane.
C1 noun /ˈkɑːmənˌwɛlθ/

commonwealth

Meaning
an independent community or state, especially one founded for the common good; also an association of nations
Example
Australia is a member of the Commonwealth of Nations.
C1 adjective /ˈreɪ.si/

racy

Meaning
Lively, entertaining, or slightly shocking (especially in a sexual way).
Example
The novel was full of racy dialogues.
C1 adjective ˌɪn.təˈmɪt.ənt

intermittent

Meaning
Happening irregularly, not continuously.
Example
The rain was intermittent throughout the day.
C1 noun /ˈhɛzɪtənsi/

hesitancy

Meaning
The tendency to pause or delay due to uncertainty or fear.
Example
His hesitancy in answering made everyone doubt his confidence.
C1 verb /kənˈsɛptʃuəlaɪz/

conceptualize

Meaning
to form an idea or concept of something in your mind
Example
The artist conceptualized a new design for the exhibition.
C1 adjective /əˈfɜːrmətɪv/

affirmative

Meaning
expressing agreement, approval, or a positive response
Example
She gave an affirmative answer to the proposal.
C1 noun /ˈfɔːrˌθɔːt/

forethought

Meaning
careful consideration of what will be necessary or may happen in the future
Example
With a little forethought, we could have avoided the problem.
C1 verb /ˌsuːpərˈsiːd/

supersede

Meaning
To replace or take the place of something because it is more modern or effective.
Example
This new law will supersede the old regulations.
C1 adverb /ˈaʊtwədli/

Outwardly

Meaning
on the surface; externally; in appearance
Example
Outwardly, he seemed calm, but inside he was nervous.
C1 verb /ˌɪn.trəˈspekt/

introspect

Meaning
To examine one's own thoughts, feelings, or mental state.
Example
He often introspects before making important decisions.
C1 adjective /ˈboʊɡəs/

bogus

Meaning
false, fake, or not genuine
Example
The police arrested him for using a bogus ID card.
C1 noun /bɪˈtreɪər/

Betrayer

Meaning
a person who betrays someone or something; one who is disloyal
Example
The betrayer was exposed and faced severe consequences.
C1 noun /rɪˌdʒuːvəˈneɪʃən/

rejuvenation

Meaning
The process of restoring something to a former better state, especially referring to renewing soil fertility or revitalizing agricultural land through various restoration practices.
Example
Rejuvenation of soil is necessary for sustainable agriculture.
C1 noun /məˈnɒtəni/

monotony

Meaning
Lack of variety and interest; tedious repetition and routine.
Example
Breaking the monotony of everyday life can improve mental health.
C1 noun /ˈlæb.ə.rɪnθ/

labyrinth

Meaning
A complicated network of paths or passages; an intricate and confusing arrangement.
Example
The city's streets were like a labyrinth.
C1 adjective /rɪˈbel.jəs/

Rebellious

Meaning
defying authority; resisting control; disobedient;
Example
The rebellious teenager refused to follow his parents' rules.
C1 noun ˈfæl.ə.si

fallacy

Meaning
False belief, misconception, false reasoning.
Example
The idea that success comes easy is a fallacy.
C1 verb /dɪˈmɔrəˌlaɪz/

demoralize

Meaning
to cause someone to lose confidence or hope
Example
The constant criticism demoralized the young athlete.
C1 adjective /rɪˈtæl.i.ə.tɔːr.i/

retaliatory

Meaning
Taking action in response to another's action, characterized as punitive, revengeful, or counteractive.
Example
The country imposed retaliatory tariffs in response to trade sanctions.
C1 adjective /ˈsaɪz.mɪk/

seismic

Meaning
Relating to earthquakes or vibrations of the earth and its crust.
Example
The region is known for its seismic activity.
C1 noun /pɒmp/

pomp

Meaning
ceremonial display or splendor; grandeur
Example
The graduation ceremony was full of pomp and circumstance.
C1 verb /ɡraɪp/

gripe

Meaning
to complain about something in an annoying way
Example
He is always griping about the weather.
C1 verb /əˈsæsɪneɪt/

assassinate

Meaning
To murder someone important, often a political or religious leader, usually by surprise attack.
Example
The rebels planned to assassinate the king.
C1 noun ˌflʌk.tʃuˈeɪ.ʃən

fluctuation

Meaning
An irregular rising and falling in number or amount; a variation.
Example
The stock market experiences frequent fluctuation.
C1 adjective /ˈtrænzvɜːrs/

transverse

Meaning
situated or lying across something
Example
The transverse road connects two highways.
C1 noun /nɑːrˈkɒtɪk/

narcotic

Meaning
A drug that dulls the senses and relieves pain, often causing sleep and sometimes addiction.
Example
The police seized a large amount of narcotic substances.
C1 noun vaɪˈtæləti

vitality

Meaning
The state of being strong and active; energy.
Example
The vitality of the team helped them succeed in the competition.
C1 verb /tɔːnt/

taunt

Meaning
to provoke or challenge someone with insulting remarks
Example
The bully tried to taunt him with cruel words.
C1 noun əbˈzɔːrp.ʃən

absorption

Meaning
The process or action by which one thing absorbs or is absorbed by another.
Example
Plants help in the absorption of carbon dioxide.
C1 adjective /ˈtɛn.ju.əs/

tenuous

Meaning
Very weak, thin, or slight; lacking a strong basis.
Example
The evidence against him is quite tenuous.