subterranean
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C1 adjective /ˌsʌb.təˈreɪ.ni.ən/

subterranean

Meaning
Existing, occurring, or done under the earth's surface.
Example
Subterranean water sources help sustain agriculture.
C1 noun /ˌspɒn.təˈneɪ.ɪ.ti/

spontaneity

Meaning
The quality of being spontaneous; natural and unplanned behavior.
Example
His spontaneity makes him a great conversationalist.
C1 noun ˌkɒn.əˈteɪ.ʃən

connotation

Meaning
The implied or suggested meaning of a word beyond its literal definition
Example
The word 'home' has a warm connotation of comfort and family.
C1 noun /ˌbɪbliˈɒɡrəfi/

bibliography

Meaning
a list of books, articles, or other sources used or referred to in scholarly work
Example
The report includes a detailed bibliography at the end.
C1 verb /ˈmʌmbəl/

mumble

Meaning
To speak quietly and not clearly so that words are difficult to understand.
Example
He mumbled an apology before leaving.
C1 adjective /ˌɪnˌkɒnsɪˈkwɛnʃəl/

inconsequential

Meaning
Not important or significant; too small to matter.
Example
The mistake was minor and inconsequential.
C1 adjective /sɪmˈfɒnɪk/

symphonic

Meaning
relating to or having the character of a symphony or symphony orchestra
Example
The concert featured a symphonic masterpiece.
C1 verb /ˈsætʃəˌreɪt/

saturate

Meaning
to fill completely with something until no more can be absorbed
Example
The heavy rain saturated the ground within minutes.
C1 verb /dɪˈfɔːrm/

deform

Meaning
to change the shape or form of something, especially in a way that makes it ugly or damaged; to distort
Example
The intense heat began to deform the plastic container.
C1 adjective /ɪˈmɜːrdʒənt/

emergent

Meaning
just coming into existence or becoming prominent
Example
The emergent startup quickly attracted investors.
C1 adjective /ɪmˈpɜːmiəbl/

impermeable

Meaning
Not allowing fluid or gas to pass through.
Example
The container is made of impermeable plastic.
C1 noun /əˈtrɑːsəti/

atrocity

Meaning
an extremely cruel or violent act, often involving physical violence
Example
The world condemned the atrocity committed against civilians.
C1 adjective /ˌʌnəbˈtruːsɪv/

unobtrusive

Meaning
not attracting attention; blending in without causing notice
Example
The security cameras are designed to be unobtrusive.
C1 verb /kəˈleɪt/

collate

Meaning
to collect, arrange, and combine in order
Example
The secretary collated the reports before the meeting.
C1 verb /ˈaɪdəlaɪz/

idolize

Meaning
To admire or worship someone excessively.
Example
Fans often idolize celebrities for their talent and lifestyle.
C1 adjective ɪnˈdel.ə.bəl

indelible

Meaning
Making marks that cannot be removed; impossible to forget or remove.
Example
Her speech left an indelible mark on the audience.
C1 noun /ˈæd.vənt/

advent

Meaning
The arrival of a notable person, thing, or event.
Example
The advent of the internet changed the way people communicate.
C1 verb /dɪsˈpruːv/

disprove

Meaning
to show that something is false or wrong
Example
The scientist worked hard to disprove the old theory.
C1 verb /ˌaʊtˈweɪ/

outweigh

Meaning
To be more important, valuable, or significant than something else.
Example
The benefits of the new policy outweigh the risks.
C1 verb /ˌriːˈvaɪ.t̬əl.aɪz/

revitalize

Meaning
To restore energy and effectiveness to something.
Example
The new policies aim to revitalize the economy.
C1 noun /ˈsɒlstɪs/

solstice

Meaning
the two times in the year when the sun is at its greatest distance from the equator (summer and winter solstice)
Example
People celebrate the summer solstice with festivals and rituals.
C1 noun ˌmɪsˈmænɪdʒmənt

mismanagement

Meaning
Bad or careless management of something.
Example
Mismanagement of plastic waste worsens pollution.
C1 noun /ˈwɪŋˌspæn/

wingspan

Meaning
the distance from the tip of one wing to the tip of the other wing
Example
The eagle has an impressive wingspan of over two meters.
C1 adjective /ˈsiːs.ləs/

Ceaseless

Meaning
continuing without pause or interruption; endless
Example
The ceaseless rain lasted for three days.
C1 adverb /ˈmerɪli/

Merrily

Meaning
in a cheerful and joyful manner
Example
The children played merrily in the garden.
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 /ˈɔːrθədɑːks/

orthodox

Meaning
conforming to traditional beliefs or practices
Example
He comes from a very orthodox family.
C1 verb /dɪˈluːd/

delude

Meaning
To mislead someone into believing something that is not true.
Example
He deluded himself into thinking he could win the race without training.
C1 adjective /ˈheɪ.nəs/

Heinous

Meaning
extremely wicked or evil; abominable; morally reprehensible
Example
The heinous crime shocked the entire community.
C1 adverb kəmˈpæktli

compactly

Meaning
In a closely packed or dense manner.
Example
Protons and neutrons are compactly arranged.
C1 noun /ˈmænɪkɪn/

mannequin

Meaning
a life-sized model of a human figure used by shops to display clothes
Example
The mannequin in the shop window was dressed in a red gown.
C1 noun /ˈdʒʌŋk.tʃər/

Juncture

Meaning
a particular point in events or time; a critical moment when important decisions must be made
Example
At this juncture, we need to make a crucial decision about our future.
C1 verb /ˈflaʊndər/

flounder

Meaning
To struggle or stagger clumsily; to experience difficulty or confusion.
Example
He floundered in the interview when asked difficult questions.
C1 noun /ˌdiː.mɑːˈkeɪ.ʃən/

Demarcation

Meaning
the action of fixing the boundary or limits of something; separation or division
Example
The demarcation between public and private land was clearly marked.
C1 noun /ˈræftər/

rafter

Meaning
One of the sloping beams that supports a roof.
Example
The old barn’s rafters were exposed.
C1 adjective /ˌɒstɛnˈteɪʃəs/

ostentatious

Meaning
Characterized by a showy or pretentious display intended to impress others.
Example
He wore an ostentatious gold chain to the party.
C1 noun /ˈfaɪər.wɔːl/

firewall

Meaning
A network security system that monitors and controls incoming and outgoing network traffic based on predetermined security rules.
Example
A firewall protects networks from cyber-attacks.
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 noun/verb /kwɪp/

quip

Meaning
A witty remark; to make a witty or clever comment.
Example
She quipped about the weather during the meeting.
C1 noun ˈkɔː.pəs

corpus

Meaning
A large collection of linguistic data used for language analysis and research.
Example
Linguists use a corpus to analyze language patterns.
C1 noun ˈflɔː.rə ænd ˈfɔː.nə

flora and fauna

Meaning
The plants and animals of a particular region, habitat, or geological period.
Example
The Galápagos Islands have unique flora and fauna.
C1 adjective /ˈfiːzəbl/

feasible

Meaning
possible to do easily or conveniently; practical and workable
Example
It is feasible to complete the project within two months.
C1 noun /ˈʃrɪŋkɪdʒ/

shrinkage

Meaning
The process of becoming smaller in size, amount, or value.
Example
The company reported a shrinkage in profits this quarter.
C1 verb /flaʊt/

flout

Meaning
To openly disregard or show contempt for a rule or law.
Example
The company was fined for flouting environmental regulations.
C1 adjective /ˈtɒp.məʊst/

Topmost

Meaning
highest in position or rank
Example
The flag was placed on the topmost branch of the tree.
C1 noun/verb /reɪn/

rein

Meaning
A strap used to control a horse; to control or guide something.
Example
The rider pulled the rein to stop the horse.
C1 verb, noun /ˈɡrɪməs/

grimace

Meaning
to make an ugly, twisted expression on one's face, usually in disgust or pain
Example
He grimaced when he tasted the sour fruit.
C1 noun /ˌɪnkoʊˈhɪrəns/

incoherence

Meaning
The quality of being unclear, confused, or lacking logical connection.
Example
His speech was full of incoherence and difficult to follow.
C1 noun /ˈfʌŋɡəs/

fungus

Meaning
a spore-producing organism feeding on organic matter, including molds, yeast, and mushrooms
Example
A strange fungus was growing on the old tree.
C1 noun /ˈhɛksəˌɡɒn/

hexagon

Meaning
A six-sided polygon.
Example
A honeycomb cell is shaped like a hexagon.
C1 noun/verb /ˈtæm.pər.ɪŋ/

tampering

Meaning
The action of interfering with something in order to cause damage or make unauthorized alterations.
Example
Tampering with evidence is a criminal offense.
C1 adjective /ˈlɔːf.ti/

Lofty

Meaning
of great height; noble in character; elevated in style
Example
He has lofty ideals about making the world a better place.
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 /kənˈviːn/

convene

Meaning
to come together or assemble, especially for a meeting or formal gathering
Example
The board will convene tomorrow to discuss the new policy.
C1 noun /ˈwɔː.tər ˈspɪn.ɪtʃ/

Water Spinach

Meaning
A semi-aquatic leafy vegetable with hollow stems, popular in Asian cuisine
Example
Water spinach grows well in wet soil.
C1 adjective /ˈræspi/

raspy

Meaning
having a harsh, rough, or grating sound
Example
His raspy voice revealed years of smoking.
C1 verb /ˈkrɪsən/

christen

Meaning
to give a name to someone at baptism or to name something officially
Example
They christened the ship after the queen.
C1 verb /ˈflʌtər/

flutter

Meaning
to move or flap quickly and lightly; to beat or wave with small rapid motions
Example
The butterfly began to flutter its wings in the sunlight.
C1 noun /ɪˈreləvəns/

irrelevance

Meaning
the quality of not being connected to or important for a particular matter; lack of significance
Example
His long explanation only highlighted the irrelevance of the details to the main issue.
C1 noun /ˌiː.kəˈnɒm.ɪk dɪˈspær.ɪ.ti/

Economic Disparity

Meaning
The unequal distribution of income and opportunity between different groups in society.
Example
Addressing economic disparity is crucial for social stability.
C1 verb /ˈoʊvərˌhɔːl/

overhaul

Meaning
to examine thoroughly and repair or improve something that is worn or ineffective
Example
The company decided to overhaul its outdated computer system.
C1 noun /ˌjuːθəˈneɪʒə/

euthanasia

Meaning
The practice of intentionally ending a life to relieve pain and suffering.
Example
The debate about euthanasia raises difficult ethical questions.
C1 adjective /ˌɪndɪˈsaɪsɪv/

Indecisive

Meaning
unable to make decisions quickly; hesitant; wavering
Example
She was indecisive about which university to attend.
C1 adjective /ˈrek.wɪ.zɪt/

Requisite

Meaning
made necessary by particular circumstances; required
Example
Good communication skills are requisite for this job.
C1 adjective /əˈnæl.ə.ɡəs/

analogous

Meaning
Comparable in certain respects, typically in a way that makes clearer the nature of things being compared.
Example
The human brain is analogous to a supercomputer.
C1 adjective /ɪnˈsʌf.ər.ə.bəl/

insufferable

Meaning
Too extreme to bear; intolerable.
Example
The heat during the summer was insufferable.
C1 verb /dɪsˈkleɪm/

disclaim

Meaning
to deny responsibility or connection with something
Example
The company disclaimed responsibility for the accident.
C1 adjective /ˌpæn.əˈræm.ɪk/

panoramic

Meaning
Giving a wide view of an extensive area in all directions.
Example
The hotel offers panoramic views of the ocean.
C1 noun /ˈprɒksi/

proxy

Meaning
A person authorized to act on behalf of another; a substitute.
Example
She voted by proxy at the meeting.
C1 adjective/adverb /ɡəˈlɔːr/

galore

Meaning
In large amounts; abundant or plentiful.
Example
There were books galore in the old library.
C1 adjective /ɡrəˈtjuːɪtəs/

gratuitous

Meaning
Unnecessary, unwarranted, or given freely without reason or cause.
Example
The movie was criticized for its gratuitous violence.
C1 noun /bɪˈriːvmənt/

bereavement

Meaning
The state of having lost a loved one through death.
Example
She received many letters of sympathy during her time of bereavement.
C1 noun ˈrɛp.ə.twɑːr

repertoire

Meaning
A stock of plays, dances, or pieces that a company or a performer knows or is prepared to perform.
Example
The actor's repertoire includes both comedy and drama.
C1 verb /ˈdʒenərəlaɪz/

generalize

Meaning
To make a broad statement by inferring from specific cases.
Example
It is wrong to generalize based on a few experiences.
C1 adjective /rɪˈsɪ.prə.kəl/

Reciprocal

Meaning
given or done in return; mutual; shared equally by both parties;
Example
The two countries have a reciprocal trade agreement.
C1 noun /ˈmæl.ɪt/

Mallet

Meaning
a hammer with a large head, typically made of wood
Example
The carpenter used a rubber mallet to avoid damaging the wood.
C1 adjective ɛnˈdɛm.ɪk

endemic

Meaning
Native and restricted to a certain place.
Example
The Bengal tiger is endemic to the Indian subcontinent.
C1 noun /əˈpɒsəl/

apostle

Meaning
A vigorous and pioneering advocate or supporter of a particular cause, often used for the early Christian disciples.
Example
He became an apostle of environmental protection.
C1 adjective /ɪkˈspænsɪv/

expansive

Meaning
covering a wide area or having a wide range of ideas or emotions
Example
They enjoyed the expansive view from the hilltop.
C1 adjective /ˈtʃɛk.ərd/

checkered

Meaning
Having a pattern of alternating squares of different colors; also describing a past full of ups and downs or varied experiences.
Example
He had a checkered career with many highs and lows.
C1 verb /ˈhʌsəl/

hustle

Meaning
to move quickly and energetically; to push or work hard to achieve something
Example
She had to hustle to finish the project on time.
C1 noun /rɪft/

rift

Meaning
a serious break in a relationship; a split or crack
Example
A rift developed between the two friends after the argument.
C1 adjective ɪmˈpɛkəbl

impeccable

Meaning
In accordance with the highest standards; faultless.
Example
His impeccable taste in fashion was admired by all his peers.
C1 noun /heɪz/

Haze

Meaning
a slight obscuration of the lower atmosphere, typically caused by fine suspended particles; confusion
Example
The morning haze lifted gradually as the sun rose higher in the sky.
C1 adjective skiˈmæt.ɪk

Schematic

Meaning
Presenting some framework or concept briefly
Example
The engineer provided a schematic diagram of the project.
C1 verb /ˈnjuːtrəlaɪz/

neutralize

Meaning
to make something ineffective or harmless
Example
The medicine helped neutralize the poison in his system.
C1 noun ˈdɪl.ɪ.dʒəns

diligence

Meaning
Careful and persistent work or effort.
Example
Success requires patience and diligence.
C1 noun ɪnˌɛv.ɪ.təˈbɪl.ɪ.ti

inevitability

Meaning
The quality of being certain to happen and impossible to avoid or prevent.
Example
The inevitability of change is a part of life.
C1 verb /θrɒb/

throb

Meaning
to beat or pulse strongly, often with pain
Example
His head began to throb after the long day.
C1 noun/verb /dɪsˈdeɪn/

disdain

Meaning
The feeling that someone or something is unworthy of respect; to regard with contempt.
Example
She looked at the messy room with open disdain.
C1 adjective /ˌʌnkɒnstɪˈtuːʃənəl/

Unconstitutional

Meaning
not in accordance with a political constitution; violating constitutional principles
Example
The court declared the new law unconstitutional.
C1 verb /klæsp/

clasp

Meaning
to grasp or hold tightly; also a device for fastening
Example
She clasped her hands together in prayer.
C1 verb diːˈsɛn.sɪ.taɪz

desensitize

Meaning
To make someone less sensitive or reactive to something through repeated exposure.
Example
Constant exposure to violence can desensitize people.
C1 noun /sloʊθ/

Sloth

Meaning
laziness; reluctance to work or make an effort
Example
His sloth prevented him from achieving his goals.
C1 adjective /ˈwaɪəri/

wiry

Meaning
Lean, tough, and strong, often with sinewy muscles.
Example
The wiry athlete moved with remarkable speed and agility.
C1 adjective /ˈbɛndi/

bendy

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

Casing

Meaning
a cover or shell that protects or encloses something
Example
The mechanic removed the engine casing to examine the internal parts.
C1 noun ˈpɑː.sɪŋ

parsing

Meaning
The process of analyzing sentence structure to understand grammatical relationships.
Example
The AI model performs parsing to understand syntax.
C1 noun /ˈledʒ.ər/

Ledger

Meaning
a book or other collection of financial accounts of a particular type
Example
The accountant updated the company ledger daily.
C1 verb /sleɪ/

slay

Meaning
to kill violently; informally, to impress greatly
Example
The hero vowed to slay the dragon.
C1 adverb /ˌðɛərˈʌv/

Thereof

Meaning
of that; from that
Example
The contract and all amendments thereof must be signed.
C1 adjective rɪsk-ədˈʤɛstɪd

risk-adjusted

Meaning
Modified or calibrated to account for risk factors in investment returns.
Example
Risk-adjusted returns consider both potential profit and loss.
C1 verb /ʌnˈmɑːsk/

unmask

Meaning
to remove a mask or covering; to reveal the true identity, nature, or intentions of someone or something
Example
The investigation helped unmask the real culprit behind the crime.
C1 verb/noun /ˈkwɪbəl/

quibble

Meaning
To argue or raise objections about a trivial matter; a petty objection.
Example
They quibbled over who should pay the bill.
C1 noun məˈnjʊər

manure

Meaning
Animal dung used for fertilizing land; organic matter used as fertilizer.
Example
Organic manure enhances soil fertility.
C1 noun /rɪˈspɒnsɪvnəs/

responsiveness

Meaning
The quality of reacting quickly and positively
Example
The manager appreciated her responsiveness to customer feedback.
C1 noun trænˈsɛndəns

transcendence

Meaning
Existence or experience beyond the normal or physical level.
Example
The artist's work was a symbol of transcendence in creativity.
C1 adverb, adjective /ˌɪnkɑːɡˈniːtoʊ/

incognito

Meaning
In disguise or with one's identity concealed.
Example
The celebrity traveled incognito to avoid the paparazzi.
C1 noun /ˈnʌr.ɪʃ.mənt/

nourishment

Meaning
Food and nutrients necessary for the body's growth and development.
Example
Proper nourishment is essential for child development.
C1 verb /siːð/

seethe

Meaning
To be filled with intense but unexpressed anger or agitation.
Example
She was seething with anger after the unfair decision.
C1 noun /braɪn/

brine

Meaning
Water saturated with salt, often used for preserving food.
Example
The olives were stored in brine to keep them fresh.
C1 noun /ˌɡaɪnəˈkɒlədʒi/

gynecology

Meaning
the branch of medicine dealing with women's reproductive health
Example
She decided to specialize in gynecology after medical school.
C1 verb /nɪp/

nip

Meaning
to pinch or bite lightly; to move quickly
Example
The cold wind nipped at my face.
C1 adjective /ˈɒptɪkəl/

optical

Meaning
related to or used in seeing or sight
Example
The optical illusion fooled everyone at the exhibition.
C1 adjective /ˈæŋ.ɡjə.lər/

Angular

Meaning
having sharp corners or edges; relating to angles
Example
The building has an angular design with sharp corners.
C1 adjective /ˈkɒn.ɪ.fər.əs/

coniferous

Meaning
Relating to cone-bearing trees that usually have needle-like leaves and remain green year-round.
Example
Pine trees are coniferous and grow in colder climates.
C1 noun /ˈaʊtpoʊst/

outpost

Meaning
A small military camp or position at some distance from the main force, used especially as a guard.
Example
The soldiers were stationed at a remote outpost.
C1 adjective /ɪnˈdʌldʒənt/

indulgent

Meaning
Having a tendency to be overly generous or lenient with someone.
Example
The indulgent mother allowed her child to stay up late.
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 noun /eb/

Ebb

Meaning
the receding tide; a gradual decline or reduction
Example
The fishermen waited for the ebb before returning to shore.
C1 noun /mɪˈlɪʃə/

militia

Meaning
a group of ordinary people who are trained to act as soldiers in emergencies
Example
The village formed a militia to defend against attacks.