treacherous
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C1 adjective /ˈtrɛtʃərəs/

treacherous

Meaning
Dangerously unstable or deceptive; likely to betray trust.
Example
The treacherous road made driving difficult.
C1 adjective /ˈædʒ.aɪl/

agile

Meaning
able to move quickly and easily; quick and adaptable in thinking or action
Example
The startup team was agile in responding to market changes.
C1 adjective /ˌɪn.səbˈstæn.ʃəl/

insubstantial

Meaning
Lacking strength, substance, or solidity.
Example
The evidence provided was insubstantial and unconvincing.
C1 noun /dʒɛˈsteɪʃən/

gestation

Meaning
the process of carrying or being carried in the womb between conception and birth; the development of an idea or plan
Example
The gestation period of an elephant is nearly two years.
C1 noun /ˌsɛlf əˌfɜːˈmeɪʃən/

self-affirmation

Meaning
The practice of affirming one's own worthiness and value as an individual.
Example
Daily self-affirmation can boost your confidence.
C1 noun /ˌrek.ənˌsɪl.iˈeɪ.ʃən/

reconciliation

Meaning
The restoration of friendly relations; the action of making one view or belief compatible with another.
Example
The peace treaty was a major step toward reconciliation.
C1 noun /ˌdʒæm.bəˈriː/

Jamboree

Meaning
a large celebration or party; a gathering with entertainment; a festive event
Example
The scout jamboree brought together thousands of young people from around the world.
C1 noun /ˈkændɪdnəs/

candidness

Meaning
The quality of being open, honest, and straightforward
Example
Her candidness during the meeting impressed everyone.
C1 verb /riːˈkæptʃər/

recapture

Meaning
To take back or regain possession of something.
Example
The army managed to recapture the lost territory.
C1 noun /ˈæspɪrənt/

aspirant

Meaning
a person who seeks or hopes to achieve a position of honor or advancement
Example
She is an aspirant for the university's top scholarship.
C1 verb /nəˈsɛsɪteɪt/

necessitate

Meaning
To make something necessary or unavoidable.
Example
The heavy rains necessitated the cancellation of the event.
C1 noun /bɑːm/

balm

Meaning
A soothing ointment or something that provides comfort or relief.
Example
The balm helped relieve the pain from her sunburn.
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 adjective ˈek.wɪ.tə.bəl

equitable

Meaning
Fair and impartial
Example
Equitable AI ensures fairness in technology use.
C1 adjective /ˈɪnbɔːrn/

Inborn

Meaning
existing from birth; natural; inherent
Example
She has an inborn talent for music.
C1 noun /ˈtriːkəl/

treacle

Meaning
A thick, sweet syrup; excessively sentimental speech or writing.
Example
She poured treacle over the pancakes.
C1 noun dɪˈtætʃ.mənt

detachment

Meaning
The state of being objective or aloof; not being emotionally involved.
Example
Buddhist philosophy encourages detachment from material desires.
C1 noun /ɡəˈzet/

Gazette

Meaning
an official journal or newspaper, especially one published by an organization or government
Example
The promotion was officially announced in the government gazette last week.
C1 adjective /ɪnˈtændʒəbl/

intangible

Meaning
Unable to be touched or grasped; not having a physical presence.
Example
Trust is an intangible quality in relationships.
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 adjective /dɪˈspɪkəbl/

despicable

Meaning
Deserving hatred and contempt; vile or shameful.
Example
His despicable actions shocked the entire community.
C1 noun /ˈsɒl.ɪs/

Solace

Meaning
comfort or consolation in a time of distress or sadness
Example
She found solace in music after her loss.
C1 noun /ˈɡrɪd.əl/

Griddle

Meaning
a flat heating surface for cooking food, typically made of metal
Example
She cooked pancakes on the hot griddle.
C1 adjective /ɪnˈtræk.tə.bəl/

intractable

Meaning
Difficult or impossible to manage, control, or solve.
Example
The conflict has become an intractable problem.
C1 noun /pəˈtɜːrnəti/

paternity

Meaning
The state of being someone's father.
Example
He demanded a paternity test to confirm his relationship with the child.
C1 adjective /ˈsɪn.tɪ.leɪ.tɪŋ/

scintillating

Meaning
brilliantly clever, exciting, or sparkling
Example
Her scintillating conversation kept everyone entertained.
C1 noun /ˈdʒʌɡərˌnɔːt/

juggernaut

Meaning
A huge, powerful, and unstoppable force or institution.
Example
The new tech company has become a juggernaut in the industry.
C1 noun /kuː/

coup

Meaning
a sudden, decisive action that brings about a change, especially in government
Example
The military staged a coup to overthrow the existing regime.
C1 verb /ˈkwɪvər/

quiver

Meaning
To tremble or shake with slight but rapid motion.
Example
Her lips began to quiver as she tried not to cry.
C1 noun /ˈhæv.ək/

Havoc

Meaning
widespread destruction; great confusion or disorder; chaos
Example
The hurricane wreaked havoc on the coastal towns, destroying homes and businesses.
C1 verb /mɑːr/

mar

Meaning
to spoil or damage the appearance or quality of something
Example
The scratch will mar the beauty of the painting.
C1 noun /ˈfɔːreɪ/

foray

Meaning
A sudden short attack or attempt, especially into new activity or territory.
Example
The company made its first foray into the international market.
C1 noun /hɪˈstɪəriə/

hysteria

Meaning
An uncontrollable outburst of emotion or fear, often characterized by irrational behavior.
Example
The crowd was in a state of hysteria during the concert.
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 /ˈbɑn.dɪdʒ/

Bondage

Meaning
the state of being a slave; the state of being under the control of a force or influence
Example
The people fought to escape from the bondage of oppression.
C1 adjective ˈmær.ɪ.taɪm

Maritime

Meaning
Connected with the sea, especially in relation to seafaring commercial or military activity.
Example
Maritime trade enhances the economy.
C1 verb /pərˈsɑːnɪfaɪ/

personify

Meaning
To represent or embody a quality, idea, or concept in human form.
Example
She personifies kindness and generosity.
C1 adjective /ˈdeɪnti/

dainty

Meaning
Delicately small, pretty, and often considered elegant.
Example
She wore a dainty necklace made of pearls.
C1 verb /ɪnˈlɪst/

enlist

Meaning
to join or sign up, especially for military service; to secure someone's support or help
Example
He decided to enlist in the army after graduation.
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 /ˌrætɪfɪˈkeɪʃən/

Ratification

Meaning
the action of signing or giving formal consent to a treaty, contract, or agreement
Example
The treaty required ratification by both countries' parliaments.
C1 adjective /ˈpɔːrəs/

porous

Meaning
Having tiny holes that allow liquid or air to pass through.
Example
The soil is very porous and drains quickly.
C1 noun /ˈkaʊərdɪs/

cowardice

Meaning
lack of courage; behavior showing fear
Example
His cowardice prevented him from speaking up.
C1 noun /ˈmælədi/

Malady

Meaning
A disease or ailment; a serious problem
Example
The doctor diagnosed a rare malady that affected her nervous system.
C1 noun kənˈfɔː.mə.ti

conformity

Meaning
Compliance with standards, rules, or laws. Behavior in accordance with socially accepted conventions.
Example
Strict conformity to the rules ensures order in society.
C1 adjective /ˈpjuː.nɪ.tɪv/

punitive

Meaning
Inflicting or intended as punishment.
Example
The company faced punitive measures for violating the law.
C1 adjective /rɪˈtɔːrɪkəl/

rhetorical

Meaning
relating to the art of effective or persuasive speaking or writing; often a question asked to make a point rather than get an answer
Example
He asked a rhetorical question during the debate.
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 adjective /ˈluː.mɪ.nəs/

Luminous

Meaning
bright; shining; emitting light; radiant
Example
The luminous stars filled the dark night sky.
C1 adjective /ˈpɛnsɪv/

pensive

Meaning
Engaged in deep or serious thought.
Example
She looked pensive as she stared out of the window.
C1 verb /tʃɑːr/

char

Meaning
To burn or scorch something so that it becomes blackened.
Example
The cook accidentally charred the steak.
C1 noun /ˈbuːt.stræp.ɪŋ/

bootstrapping

Meaning
Starting a business with personal resources or small investments without external funding or venture capital.
Example
Many entrepreneurs rely on bootstrapping to launch their businesses.
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 ˈprəʊses stəˈbɪlɪti

process stability

Meaning
The consistency and steadiness of biological or functional processes
Example
Cold air ensures process stability in plants.
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 /mjuːˈteɪʃn/

mutation

Meaning
A change in form, structure, or nature, especially in genetics.
Example
Scientists discovered a genetic mutation that caused the disorder.
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 /ɪmˈbɛzlmənt/

embezzlement

Meaning
The act of dishonestly taking money or property entrusted to one's care.
Example
The accountant was arrested for embezzlement of company funds.
C1 noun /ˈʌp.rɔːr/

Uproar

Meaning
a loud and emotional noise or disturbance; public outcry
Example
The announcement caused an uproar among the students.
C1 verb /ɪɡˈzɒnəreɪt/

exonerate

Meaning
To clear someone from blame or accusation.
Example
The court exonerated her from all charges.
C1 noun /dɪˈfen.dənt/

Defendant

Meaning
an individual, company, or institution sued or accused in a court of law
Example
The defendant pleaded not guilty to all charges brought against him.
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 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 noun /ˈiːdɪkt/

edict

Meaning
An official order, proclamation, or decree issued by an authority.
Example
The king issued an edict banning smoking in public places.
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 adjective ɪˈθɪə.ri.əl

ethereal

Meaning
Extremely delicate and light in a way that seems too perfect for this world.
Example
Her voice had an ethereal quality.
C1 noun /ˈstɪklər/

stickler

Meaning
a person who insists on a certain quality or standard of behavior
Example
He is a stickler for punctuality and never tolerates delays.
C1 noun /blɜːrb/

blurb

Meaning
a short promotional description of a book, product, or service
Example
The back cover had a blurb praising the novel.
C1 noun /əˈliː.dʒəns/

allegiance

Meaning
Loyalty or commitment of a subordinate to a superior or of an individual to a group or cause.
Example
Soldiers take an oath of allegiance to their country.
C1 adjective /ˈrɪkɪti/

rickety

Meaning
Poorly made and likely to collapse; shaky.
Example
They crossed a rickety wooden bridge over the river.
C1 noun prɪˈdɪk.ə.mənt

predicament

Meaning
A difficult, unpleasant, or embarrassing situation.
Example
Losing both jobs put him in a financial predicament.
C1 noun /ˈkɔːrdən/

cordon

Meaning
a line or circle of police, soldiers, or guards preventing access
Example
The police set up a cordon around the crime scene.
C1 noun ˈdɛf.ər.əns

deference

Meaning
Humble submission and respect.
Example
He showed deference to his elderly mentor.
C1 adjective /ˈpoʊləraɪzd/

polarized

Meaning
divided into two sharply contrasting groups or opinions
Example
The debate polarized the community on the issue of climate change.
C1 noun /haɪˈpɒtənjuːs/

hypotenuse

Meaning
the longest side of a right-angled triangle, opposite the right angle.
Example
In a right triangle, the hypotenuse is always longer than the other two sides.
C1 noun /dɪˈkriː/

Decree

Meaning
an official order issued by a legal authority; a judicial decision or edict
Example
The king issued a decree that all citizens must pay additional taxes.
C1 adjective /ɪˈmoʊbəl/

immobile

Meaning
unable to move or be moved
Example
After the accident, he was immobile for weeks.
C1 adjective /ˌsɛlf ˈraɪtʃəs/

self-righteous

Meaning
Having or showing an attitude of moral superiority; believing one’s own beliefs are the only right ones.
Example
His self-righteous comments made everyone uncomfortable.
C1 adjective /dɪˈsperɪŋ/

Despairing

Meaning
feeling hopeless; in despair
Example
She felt despairing after losing her job.
C1 verb /ˈɛm.ə.neɪt/

emanate

Meaning
To come out or spread from a source.
Example
A sweet fragrance emanated from the garden.
C1 adjective /ɪnˈsɪstənt/

insistent

Meaning
demanding something firmly and refusing to accept no
Example
The child was insistent on getting a new toy.
C1 noun /mælˈpræktɪs/

Malpractice

Meaning
Improper, illegal, or negligent professional behavior
Example
The surgeon was sued for malpractice after the failed operation.
C1 noun /ɔːˈrɔːrə/

aurora

Meaning
A natural display of lights in the sky, usually seen in polar regions.
Example
We traveled to Norway to see the northern aurora.
C1 noun /sɛkt/

sect

Meaning
a subgroup of a larger religious or political group, often with differing beliefs
Example
The group split into different sects due to doctrinal differences.
C1 adjective ˌɪn.təˈstel.ər

interstellar

Meaning
Occurring or situated between stars.
Example
Scientists study interstellar travel possibilities.
C1 noun /ˈdaʊri/

dowry

Meaning
Property or money brought by a bride to her husband at marriage.
Example
The dowry tradition is still followed in some cultures.
C1 noun /ˈblɛm.ɪʃ/

blemish

Meaning
A small mark or flaw that spoils the appearance of something.
Example
The mirror had a small blemish on the surface.
C1 noun /ˈɪmɪdʒəri/

imagery

Meaning
visually descriptive or figurative language, especially in a literary work
Example
The poet's use of imagery brought the scene to life.
C1 noun /kənˈsep.ʃən/

Conception

Meaning
the forming of an idea or plan; the fertilization of an ovum by a sperm; the action of conceiving
Example
The conception of this innovative project took several months of brainstorming.
C1 adjective /ˌʌndərˈhændɪd/

underhanded

Meaning
acting or done in a dishonest or secret way
Example
They exposed the company's underhanded dealings with its suppliers.
C1 adjective /səˈtɪrɪk/

satiric

Meaning
Relating to or using satire.
Example
The novel takes a satiric view of urban life.
C1 adjective /ˈmoʊmənˌteri/

momentary

Meaning
Lasting for only a short time.
Example
There was a momentary silence in the room.
C1 noun /ɡeɪdʒ/

Gauge

Meaning
an instrument for measuring the magnitude, amount, or contents of something
Example
The pressure gauge showed the tank was full.
C1 noun /ɪnˈsɜːʃən/

insertion

Meaning
the action of inserting something into something else
Example
The insertion of the new data was completed successfully.
C1 adjective /ˈlɛdʒəbl/

legible

Meaning
clear enough to read
Example
Her handwriting was barely legible.
C1 verb /ˈpærəlaɪz/

paralyze

Meaning
to cause someone or something to lose the ability to move or function normally
Example
The sudden shock seemed to paralyze him.
C1 noun /kjʊˈreɪtər/

curator

Meaning
a person who is responsible for the care and management of a museum, gallery, or collection
Example
The curator organized a new exhibition of ancient artifacts.
C1 adjective ɪˌɡæl.ɪˈteə.ri.ən

egalitarian

Meaning
Believing in or based on the principle that all people are equal and deserve equal rights and opportunities.
Example
The new law promotes an egalitarian society.
C1 noun /ˈlɪməˌziːn/

limousine

Meaning
a large, luxurious car driven by a chauffeur.
Example
The bride arrived in a white limousine.
C1 noun/verb /rɪˈlæps/

relapse

Meaning
to return to a worse condition, especially after improvement; a deterioration after recovery
Example
After months of progress, he suffered a relapse.
C1 verb pleɪɡd

plagued

Meaning
Troubled or afflicted persistently by problems or difficulties.
Example
People are plagued by anxiety and depression.
C1 noun /vɛnˈdɛtə/

vendetta

Meaning
a prolonged bitter quarrel or campaign of revenge
Example
The two families were caught in a bitter vendetta for generations.
C1 noun /pərˈkʌʃən/

percussion

Meaning
Musical instruments that are played by striking, shaking, or scraping, such as drums or cymbals.
Example
The percussion section added rhythm and energy to the orchestra.
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 noun /ˈmɪd.əl.mæn/

Middleman

Meaning
A person who acts as an intermediary between two parties in a business transaction
Example
They decided to cut out the middleman and sell directly to customers.
C1 adverb /ˈhɑr.tɪ.li/

Heartily

Meaning
in a sincere and enthusiastic manner; wholeheartedly
Example
She heartily welcomed her guests to the party.
C1 noun /ˌaɪ.diˈɒl.ə.dʒi/

ideology

Meaning
A system of ideas and ideals, especially one that forms the basis of economic or political theory and policy.
Example
Democracy is based on the ideology of freedom and equality.
C1 noun, adjective /ˈpɑːrtɪzən/

partisan

Meaning
A strong supporter of a party, cause, or person; showing biased allegiance.
Example
The debate quickly turned partisan, with each side defending their own agenda.
C1 noun /ˈbraɪ.dəl/

Bridle

Meaning
the headgear used to control a horse, consisting of buckled straps and a bit
Example
The rider adjusted the horse's bridle before mounting for the race.
C1 adjective /dɪˈspɜːrst/

dispersed

Meaning
Scattered or spread across a wide area.
Example
The dispersed population made it difficult to provide public services.
C1 noun /ˈtɪt.bɪt/

Titbit

Meaning
a small piece of tasty food; a small interesting piece of information
Example
She served delicious titbits at the party.
C1 noun /ˈmaɪzər/

miser

Meaning
A person who hoards wealth and spends as little money as possible.
Example
The old miser refused to donate even a penny to charity.
C1 noun /ˈnɔː.zi.ə/

Nausea

Meaning
a feeling of sickness with an inclination to vomit
Example
The motion of the boat caused severe nausea.
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 ˌdɛməˈɡræfɪk trænˈzɪʃən

demographic transition

Meaning
A shift in population patterns from high birth and death rates to low birth and death rates as a country develops economically
Example
The demographic transition indicates a shift towards an aging society.
C1 verb /kənˈstrɪkt/

constrict

Meaning
to make narrower or tighter; to shrink or compress
Example
The snake constricted its prey before swallowing.
C1 adjective /ɪnˈkɒŋɡruəs/

incongruous

Meaning
Not fitting in with or suitable for the surroundings.
Example
His jokes were incongruous during the serious meeting.
C1 verb /ˈrʌf.l̩/

ruffle

Meaning
to disturb the smoothness of something; to annoy or upset someone
Example
The wind ruffled her hair.
C1 adjective /kənˈɡrɛʃənl/

congressional

Meaning
relating to a congress, especially the US Congress
Example
The bill received strong congressional support.
C1 noun /rɪˈteɪnər/

retainer

Meaning
a fee paid in advance to secure someone's services, or a device that holds something in place
Example
The lawyer asked for a retainer before taking the case.
C1 noun ˈsɪnədʒi

synergy

Meaning
The interaction or cooperation of two or more organizations, substances, or other agents to produce a combined effect greater than the sum of their separate effects.
Example
The synergy between the two companies led to a successful partnership.