acidity
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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 noun /ˈɒptɪks/

optics

Meaning
The branch of physics dealing with light and vision.
Example
She studied optics to understand how lenses work.
C1 noun /ˈtriːzən/

Treason

Meaning
the crime of betraying one's country, especially by attempting to kill or overthrow the sovereign or government
Example
He was accused of treason against the state.
C1 noun /krɪpt/

crypt

Meaning
an underground chamber, especially one beneath a church, used as a burial place
Example
The tourists explored the ancient crypt beneath the cathedral.
C1 adjective /ɪnˈdetɪd/

Indebted

Meaning
owing money or gratitude to someone; obligated; grateful
Example
I am deeply indebted to my teacher for all her guidance.
C1 noun /ˈpɪt.əns/

pittance

Meaning
a very small or inadequate amount of money
Example
She worked long hours for a mere pittance.
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 /ˌæfəˈdeɪvɪt/

affidavit

Meaning
a written statement confirmed by oath or affirmation, used as evidence in court
Example
The witness submitted an affidavit to the court.
C1 verb /ɪnˈtʃænt/

enchant

Meaning
to delight or charm greatly; to cast a spell over
Example
The storyteller enchanted the children with his tales.
C1 adjective /ʌnˈkɛmpt/

unkempt

Meaning
Having an untidy or disheveled appearance.
Example
He looked unkempt after sleeping outdoors all night.
C1 noun /ˈboʊ.ə/

Boa

Meaning
a large non-venomous snake that kills prey by constriction
Example
The boa constrictor wrapped around its prey.
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 adjective /əˈniːmɪk/

anemic

Meaning
Suffering from anemia; lacking in vitality, strength, or color.
Example
The doctor prescribed iron supplements for her anemic condition.
C1 adjective /əˈtjuːnd/

attuned

Meaning
Being receptive or sensitive to something; well adjusted or in harmony.
Example
She is attuned to the needs of her students.
C1 noun /rəʊˈbɒt.ɪk ˈsɜː.dʒər.i/

robotic surgery

Meaning
Surgery performed with the assistance of robotic systems to enhance precision and reduce invasiveness.
Example
Robotic surgery enhances precision in complex procedures.
C1 adjective /dɪˈvɪzəbl/

divisible

Meaning
Capable of being divided by another number without leaving a remainder.
Example
Twelve is divisible by three and four.
C1 noun /ˈdʒɒt.ər/

Jotter

Meaning
a small notebook for writing quick notes or reminders
Example
The student carried a jotter to write down important points during lectures.
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 adjective /ˈɪndɪɡoʊ bluː/

Indigo-blue

Meaning
a deep blue color with a purplish tinge
Example
The indigo-blue sky looked magnificent at twilight.
C1 verb /ʃɜːrk/

shirk

Meaning
to avoid or neglect a duty or responsibility
Example
He always tries to shirk his responsibilities at work.
C1 noun /ˈhɜː.mɪt/

Hermit

Meaning
a person living in solitude as a religious discipline; someone who withdraws from society
Example
The old hermit lived alone in a small cabin deep in the mountains, away from civilization.
C1 adjective /ɪmˈpɜːrviəs/

impervious

Meaning
Not allowing fluid to pass through; unable to be affected by something.
Example
The jacket is impervious to rain.
C1 noun /dɪˈkɔː.rəm/

Decorum

Meaning
behavior in keeping with good taste and propriety; dignified and appropriate conduct
Example
The diplomat maintained perfect decorum throughout the heated negotiations.
C1 noun /ˌæntɪˈsiːdənts/

antecedents

Meaning
previous events, conditions, or people that influence or serve as a basis for something that follows
Example
The lawyer examined the criminal antecedents of the suspect.
C1 noun ˌvæljuˈeɪʃən

valuation

Meaning
An estimation of the worth of something.
Example
The valuation of the property was much higher than expected.
C1 noun /rɪdʒ/

ridge

Meaning
a long, narrow hilltop, mountain range, or raised strip
Example
We walked along the mountain ridge.
C1 adjective/verb /ˈleɪ.bərd/

labored

Meaning
done with great effort and difficulty; or past tense of labor
Example
He gave a labored explanation that confused the audience.
C1 noun /haɪˈpɒθəsɪs/

hypothesis

Meaning
a proposed explanation made on the basis of limited evidence as a starting point for further investigation.
Example
The scientist tested her hypothesis through multiple experiments.
C1 noun/verb /ˈkwɒr.i/

quarry

Meaning
A place where stone or minerals are extracted; also means prey when hunted.
Example
The workers quarried limestone from the hill.
C1 noun /ˌdɪfəˈrɛnʃɪˈeɪʃən/

differentiation

Meaning
The action or process of differentiating or distinguishing between things.
Example
Differentiation from competitors can create a unique market position.
C1 noun ˌlɪt.ɪˈɡeɪ.ʃən

litigation

Meaning
The process of taking legal action; a lawsuit.
Example
The litigation accused the regime of human rights abuses.
C1 noun /ˈdɪs.ə.nəns/

dissonance

Meaning
Disagreement, lack of harmony, conflict between ideas or beliefs.
Example
The cultural dissonance created misunderstandings.
C1 noun /ˈɑːr.sən.əl/

arsenal

Meaning
A collection or storage place for weapons and military equipment.
Example
The army kept its weapons in a secure arsenal.
C1 verb /priːˈɛmpt/

pre-empt

Meaning
to act in advance to prevent an anticipated event from happening; forestall
Example
The government moved to pre-empt a crisis by introducing new policies.
C1 adjective /ˈpɪθ.i/

pithy

Meaning
concise and meaningful; full of substance
Example
She gave a pithy comment that summarized the issue perfectly.
C1 verb /ʌnˈnɜːrv/

unnerve

Meaning
to make someone lose confidence, courage, or composure
Example
The hostile questions began to unnerve the witness.
C1 noun /dɪˈsaɪ.pəl/

Disciple

Meaning
a follower and student of a teacher, leader, or philosopher; devoted follower
Example
The famous philosopher had many disciples who spread his teachings worldwide.
C1 adjective /ˈnɔːtɪkəl/

nautical

Meaning
relating to ships, sailors, or navigation on water
Example
He studied nautical charts before setting sail.
C1 verb /hoʊn/

hone

Meaning
To sharpen a blade or to improve a skill through practice.
Example
She honed her presentation skills before the big meeting.
C1 noun /væt/

vat

Meaning
A large container used for holding liquids such as dye or wine.
Example
The workers filled the vat with freshly pressed grape juice.
C1 adjective /kræs/

crass

Meaning
lacking sensitivity, refinement, or intelligence
Example
His crass remarks offended everyone at the meeting.
C1 adjective /ɪmˈpɜːrsənl/

impersonal

Meaning
not influenced by, showing, or involving personal feelings; lacking human warmth or emotion
Example
The letter was written in a very impersonal style.
C1 adverb /ˌɪn.dɪˈskrɪm.ɪ.nət.li/

Indiscriminately

Meaning
without making careful distinctions; randomly; without discrimination
Example
The company fired employees indiscriminately without considering their performance.
C1 adjective ˌkɑːr.sɪ.nəˈdʒen.ɪk

carcinogenic

Meaning
Having the potential to cause cancer in living tissue.
Example
Processed meat contains carcinogenic compounds.
C1 noun /ˈbed sted/

Bed stead

Meaning
the framework of a bed; a bed frame without bedding
Example
The wooden bed stead was very sturdy.
C1 noun /æɡˈnɒs.tɪk/

agnostic

Meaning
a person who believes that nothing is known or can be known about the existence of God; uncertain in belief
Example
He described himself as an agnostic rather than an atheist.
C1 noun /ˌdɪsbɪˈliːvər/

disbeliever

Meaning
a person who does not believe in something, especially a religion or idea
Example
He was called a disbeliever for rejecting the traditional faith.
C1 noun /ˌdʒuː.bɪˈleɪ.ʃən/

jubilation

Meaning
a feeling or expression of great happiness and triumph
Example
There was jubilation in the streets after the victory.
C1 verb ˌæs.ɚˈteɪn

ascertain

Meaning
To find out or discover something with certainty; to verify.
Example
The police tried to ascertain the cause of the accident.
C1 adjective bəˈnev.əl.ənt

benevolent

Meaning
Kind, generous, showing goodwill and kindness.
Example
His benevolent nature made him beloved.
C1 adjective /ˌsaɪkəˈpæθɪk/

psychopathic

Meaning
Relating to or affected by psychopathy; showing chronic mental disorder with abnormal or violent behavior.
Example
The film portrayed a psychopathic killer with no sense of empathy.
C1 adjective /ˌɪnkəmˈpætəbl/

incompatible

Meaning
Not able to exist or work together without conflict.
Example
Their personalities were completely incompatible.
C1 adjective /sliːk/

sleek

Meaning
smooth, shiny, and stylish
Example
She drove a sleek black sports car.
C1 adjective /ˈmæliəbl̩/

malleable

Meaning
Easily shaped or influenced; capable of being bent or adapted.
Example
Gold is a highly malleable metal used in jewelry.
C1 adjective /ɪnˈdʒʊəriəs/

injurious

Meaning
Causing or likely to cause harm or damage.
Example
Smoking is injurious to health.
C1 noun /sɛˈseɪʃən/

cessation

Meaning
The fact or process of ending or being brought to an end.
Example
There was a temporary cessation of hostilities.
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 verb /dɪˈteɪn/

detain

Meaning
to keep someone from proceeding; to hold back, especially by official authority
Example
The police detained the suspect for questioning.
C1 noun /ˈhɪr.seɪ/

Hearsay

Meaning
information received from other people that one cannot adequately substantiate; rumor
Example
The accusations were based on hearsay rather than concrete evidence or eyewitness testimony.
C1 noun /blæk plʌm/

Black plum

Meaning
a dark purple or black colored edible fruit with sweet and sour taste
Example
I picked some fresh black plums from the tree in our backyard.
C1 noun /bɜːrθ/

Berth

Meaning
a sleeping place in a ship, train, or other vehicle; a place where a ship can dock
Example
I booked an upper berth on the overnight train.
C1 noun /ˈʃæmbəlz/

shambles

Meaning
a state of complete disorder or ruin
Example
After the storm, the whole town was in shambles.
C1 verb /ˌpriːˈmɛdɪteɪt/

premeditate

Meaning
to think about and plan something (especially a crime) beforehand
Example
The suspect was accused of premeditating the crime.
C1 noun /ˈoʊvərˌtʊr/

overture

Meaning
An introduction to something more substantial; a proposal or preliminary action.
Example
The peace overture was welcomed by both nations.
C1 noun /ˈsɔːjər/

Sawyer

Meaning
a person who saws wood, especially as an occupation
Example
The skilled sawyer cut the logs into planks.
C1 noun /ɡʌst/

Gust

Meaning
a sudden strong rush of wind; a sudden burst or outburst of feeling
Example
A powerful gust of wind knocked over the outdoor umbrellas at the cafe.
C1 noun /ˈmaɪkrəʊˌklaɪmæt/

microclimate

Meaning
The climate of a small, specific area that may differ from the general climate of the surrounding region, often influenced by local factors like terrain, vegetation, or buildings.
Example
A microclimate can have a significant impact on plant growth.
C1 verb /spɜːr/

spur

Meaning
To encourage or motivate someone to take action.
Example
The teacher's praise spurred him to study harder.
C1 noun ˌrɛk.əˈlɛk.ʃən

Recollection

Meaning
Remembering past events or information
Example
His recollection of childhood memories was vivid.
C1 adjective /ˈflæʃi/

flashy

Meaning
ostentatious or showy in a way that attracts attention
Example
He drove a flashy sports car through the city streets.
C1 adjective /ˌloʊ ˈspɪrɪtɪd/

low-spirited

Meaning
feeling sad, depressed, or lacking enthusiasm
Example
He felt low-spirited after hearing the bad news.
C1 adjective /ˈmeʒ.ər.ə.bəl/

Measurable

Meaning
able to be measured; quantifiable
Example
The project's success was measurable by increased sales.
C1 adjective /ˈsɛm.ɪ.nəl/

seminal

Meaning
Strongly influencing later developments; highly original and influential.
Example
His seminal book changed the course of modern philosophy.
C1 noun /ˌænəsˈθetɪk/

anesthetic

Meaning
A substance that causes loss of sensation or consciousness, especially used during surgery.
Example
The doctor administered a local anesthetic before stitching the wound.
C1 noun /ˈhɛksəˌɡɒn/

hexagon

Meaning
A six-sided polygon.
Example
A honeycomb cell is shaped like a hexagon.
C1 verb /ˈtɪŋkər/

tinker

Meaning
to make small adjustments or repairs to something, often experimentally or imperfectly
Example
He likes to tinker with old radios in his garage.
C1 verb /luːt/

loot

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

infiltrate

Meaning
to secretly enter or gain access to a place or group
Example
The spies managed to infiltrate the enemy base.
C1 noun /hɒˈstɪləti/

hostility

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

Innate

Meaning
Existing from birth or natural
Example
She has an innate talent for music.
C1 noun /ˈkriː.dəns/

credence

Meaning
belief in or acceptance of something as true
Example
The witness gave credence to the defendant's alibi.
C1 verb /ˌriːˈkæl.ɪ.breɪt/

recalibrate

Meaning
To calibrate again or differently; to adjust or correct something based on new information or changed circumstances.
Example
The company had to recalibrate its strategies to adapt to the market.
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 noun /ˌpiːdiˈætrɪks/

pediatrics

Meaning
the branch of medicine dealing with the health and medical care of children
Example
She decided to specialize in pediatrics after medical school.
C1 noun ˌeə.rəʊ.daɪˈnæm.ɪks

aerodynamics

Meaning
The study of the properties of moving air and the interaction between the air and solid bodies moving through it.
Example
The aerodynamics of an aircraft determines its speed and efficiency.
C1 noun /ˈstreɪnər/

Strainer

Meaning
a device having holes punched in it or made of crossed wires for separating solid matter from a liquid
Example
Use a strainer to drain the pasta water.
C1 noun /rɪˈvʌlʃən/

revulsion

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

imprecise

Meaning
Not exact or accurate; vague.
Example
His explanation was too imprecise to be helpful.
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 /ˌaʊtˈspoʊkən/

Outspoken

Meaning
frank; speaking directly
Example
She is known for being outspoken about social issues.
C1 adjective /dɪsˈɪntrəstɪd/

disinterested

Meaning
not influenced by personal interest; impartial or neutral
Example
The judge remained disinterested in the case.
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 /əˌpɒk.əˈlɪp.tɪk/

apocalyptic

Meaning
Describing the end of the world, or something catastrophic and disastrous.
Example
The movie depicts an apocalyptic future after a nuclear war.
C1 adjective prəˈvɪnʃəl

provincial

Meaning
Of or concerning a province of a country or empire.
Example
Bengali was not just a provincial language.
C1 verb /ˌriːˈvæmp/

revamp

Meaning
To give a new and improved form, structure, or appearance to something.
Example
The company decided to revamp its website for a modern look.
C1 noun prɪˈdɪk.ə.mənt

predicament

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

convergent

Meaning
tending to move toward a common point or result
Example
The two rivers have a convergent path before entering the lake.
C1 verb /ˌʌndərˈsteɪt/

understate

Meaning
To describe something as being less important or serious than it really is.
Example
He tends to understate his achievements.
C1 verb /prɪˈzaɪd/

preside

Meaning
to be in charge of a meeting, event, or organization
Example
She will preside over the meeting tomorrow.
C1 noun /ˈfɔːrsəm/

foursome

Meaning
a group of four people or things, especially in games or social activities
Example
The foursome enjoyed a game of golf together.
C1 noun /mɪˈsɑːdʒəni/

misogyny

Meaning
Hatred of, contempt for, or prejudice against women.
Example
The novel has been criticized for promoting misogyny.
C1 noun /səbˈdʒɛkʃən/

subjection

Meaning
the act of bringing someone or something under control or domination
Example
The people suffered under the subjection of a cruel ruler.
C1 noun /ˈɡreɪvstoʊn/

gravestone

Meaning
A stone that marks a grave, usually inscribed with the name of the deceased.
Example
The gravestone had her name carved beautifully.
C1 noun, adjective /ˈlæksətɪv/

laxative

Meaning
A medicine or substance that stimulates bowel movements; tending to loosen or relieve constipation.
Example
The doctor prescribed a mild laxative for her condition.
C1 noun /ˌpɜː.mɪˈæbɪlɪti/

permeability

Meaning
The quality or state of being permeable; allowing liquids or gases to pass through.
Example
The permeability of the soil affects water retention.
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 /ˈklɛmənsi/

clemency

Meaning
mercy, leniency, or forgiveness shown towards someone
Example
The judge showed clemency and reduced his sentence.
C1 noun /plɔɪ/

ploy

Meaning
a clever plan or action designed to gain an advantage
Example
She used a clever ploy to win the debate.
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 verb /ˈɡrætɪfaɪ/

gratify

Meaning
to give pleasure or satisfaction to someone
Example
It gratified him to know his work was appreciated.
C1 adjective /sɪmˈplɪstɪk/

simplistic

Meaning
treating complex issues as if they were much simpler than they really are
Example
His explanation was too simplistic and ignored key details.
C1 noun /ˈpen.əns/

Penance

Meaning
punishment that you accept for doing something wrong; an act of showing that you are sorry for sin
Example
The monk performed penance for his past mistakes.
C1 noun /ˌsɛlf ɪnˈdʌldʒəns/

self-indulgence

Meaning
The act of allowing oneself to enjoy pleasures or desires excessively.
Example
His weekend of self-indulgence included eating sweets and watching movies nonstop.
C1 noun /ˈstæl.i.ən/

stallion

Meaning
An adult male horse that is not castrated, often used for breeding.
Example
The farm owns a powerful stallion for breeding purposes.
C1 adjective /ˈpɜːrsənəbl/

personable

Meaning
having a pleasant appearance and manner; attractive and friendly
Example
The new teacher is very personable and easy to talk to.
C1 noun /ˌædʒ.ɪˈteɪ.ʃən/

agitation

Meaning
a state of nervousness, excitement, or unrest; or action of stirring up public concern
Example
There was visible agitation among the crowd.
C1 noun (plural) /ˈɪndɪˌsiːz/

indices

Meaning
plural form of index; statistical measures or reference points used for comparison
Example
Stock market indices fell sharply after the announcement.
C1 adjective /ɪˈklɛktɪk/

eclectic

Meaning
Selecting or deriving ideas, styles, or tastes from a broad and diverse range of sources.
Example
Her taste in music is eclectic, ranging from classical to hip-hop.
C1 noun/adjective ˈflɛdʒ.lɪŋ

fledgling

Meaning
New, inexperienced, newly established.
Example
The fledgling startup needs investment.
C1 verb /fɔːrˈseɪk/

forsake

Meaning
to abandon or give up something or someone
Example
He decided not to forsake his old friends despite his success.
C1 noun /ɪnˌkɑːsəˈreɪʃən/

incarceration

Meaning
the state of being imprisoned or confined
Example
The criminal faced years of incarceration for his crimes.