observe
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B1 verb /əbˈzɜːrv/

observe

Meaning
to watch carefully; to notice or perceive something
Example
Scientists observe the behavior of animals in the wild.
B2 verb /rɪˈkɔːl/

recall

Meaning
to bring (a memory, fact, or situation) back into one's mind
Example
I can't recall the last time we met.
B2 adjective /ˌʌndɪˈsaɪdɪd/

Undecided

Meaning
not having made a decision; uncertain
Example
She was undecided about which college to attend.
B1 noun /əˈkædəmi/

academy

Meaning
an institution of learning or training
Example
He enrolled in a military academy.
A2 noun /ˈsɪk.nəs/

Sickness

Meaning
the state of being ill; a disease or illness
Example
She took time off work due to sickness.
C1 adjective /ɔːˈtʌmnəl/

autumnal

Meaning
relating to or characteristic of autumn; occurring in autumn
Example
The autumnal colors of red and gold filled the forest.
C1 noun /ˈiːɡoʊɪst/

egoist

Meaning
A person who is excessively concerned with themselves; someone who believes in or practices egoism.
Example
She avoided him because he was a selfish egoist.
C2 noun /səbˈdʌk.ʃən/

subduction

Meaning
The lateral and downward movement of the edge of a plate of the earth's crust into the mantle beneath another plate.
Example
The Pacific Ring of Fire is an area of intense subduction.
C1 noun ˈoʊʃən əˌsɪdɪfɪˈkeɪʃən

ocean acidification

Meaning
The ongoing decrease in the pH of the Earth's oceans, caused by the absorption of carbon dioxide from the atmosphere.
Example
Ocean acidification is caused by atmospheric CO2 absorption.
A1 adverb /ˈleɪtər/

later

Meaning
At a time subsequent to a reference time; afterwards.
Example
We will discuss the details later.
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.
C2 verb /bɪˈfaʊl/

befoul

Meaning
to make dirty or polluted; to disgrace or corrupt
Example
The factory waste befouled the river.
C2 adjective /ʌnˈɡeɪnli/

ungainly

Meaning
Awkward, clumsy, or lacking grace in movement or appearance.
Example
The tall boy moved in an ungainly manner.
B1 noun /ˈkætl/

cattle

Meaning
large domesticated animals such as cows and bulls that are kept on a farm for their milk, meat, or hides
Example
The farmer owns a herd of cattle that graze near the river.
C2 noun /luːn/

lune

Meaning
A crescent-shaped figure formed by two intersecting arcs; also means 'moon' in French.
Example
The mathematician studied the properties of the lune.
C2 noun /ˈhaɪərlɪŋ/

hireling

Meaning
A person who works for payment only, often with little loyalty or principle.
Example
The mercenary was dismissed as just a hireling with no real loyalty.
B2 adjective /ʌnˈstɛdi/

unsteady

Meaning
not firm or stable; likely to change or fail
Example
She felt unsteady on her feet after the long journey.
C2 noun /ˌdiːlɛkˈteɪʃən/

delectation

Meaning
great pleasure or delight
Example
She read the story aloud for the delectation of her friends.
B2 noun /dɪsˈɡreɪs/

Disgrace

Meaning
loss of reputation or respect as the result of a dishonorable action; a shameful situation
Example
His arrest brought disgrace upon his entire family and reputation.
B2 noun /ˈfæntəsi/

fantasy

Meaning
a creation of the imagination, especially something improbable or impossible
Example
She has a vivid fantasy about traveling to space.
C2 noun /lɪˈvaɪəθən/

leviathan

Meaning
a huge sea monster or something very large and powerful.
Example
The ship looked like a leviathan on the horizon.
C1 noun ɡrɪt

grit

Meaning
Long-term determination and perseverance in the face of hardship and challenges.
Example
His grit and hard work led him to success.
B1 noun /soʊl/

Soul

Meaning
the spiritual or immaterial essence of a human being or animal; a person's emotional or intellectual nature
Example
She poured her heart and soul into her artwork.
C2 noun /ˌɡlæd.iˈoʊ.ləs/

Gladiolus

Meaning
A tall flowering plant with sword-shaped leaves and colorful spike-like flower clusters, popular in gardens and floral arrangements
Example
The gladiolus stood tall and elegant in the flower bed.
C1 noun /ˈbɑːr.tər ˌsɪs.təm/

barter system

Meaning
A system of exchange where goods and services are traded directly without using money.
Example
Ancient civilizations used the barter system for trade.
B1 adjective /ˈfæʃənəbəl/

fashionable

Meaning
Following the latest styles or trends in clothing, behavior, or ideas
Example
She always wears fashionable clothes to every party.
C2 noun /stɒˈkeɪd/

stockade

Meaning
a defensive barrier made of strong posts or timbers, often around a fort or prison
Example
The prisoners were kept inside the wooden stockade.
C1 adjective /ɪkˈsaɪtəbl̩/

excitable

Meaning
easily excited or emotionally aroused
Example
The child was excitable and laughed at every small thing.
C1 noun /ɛnˈdɔːr.fɪnz/

endorphins

Meaning
Chemical compounds produced by the brain that reduce pain and create feelings of happiness.
Example
Exercise releases endorphins, reducing stress and pain.
B2 noun /bɪd/

Bid

Meaning
an offer to pay a certain amount for something; an attempt to obtain or achieve something
Example
She made a bid for the antique vase at the auction.
B2 noun /ˈsɪnəmən/

Cinnamon

Meaning
aromatic spice obtained from the inner bark of several tree species
Example
Cinnamon is often used in baking and desserts.
B2 verb /ˌʌndərˈskɔːr/

underscore

Meaning
to emphasize or highlight something
Example
The incident underscored the need for better safety measures.
A2 noun /ədˈvaɪs/

advice

Meaning
Guidance or recommendations offered with regard to prudent future action.
Example
Experts provide advice for better air quality.
B2 noun /ˈbærəl/

barrel

Meaning
a large cylindrical container used to hold liquids
Example
The wine was stored in a wooden barrel.
A2 adjective /ˈleɪ.zi/

Lazy

Meaning
idle; unwilling to work; sluggish
Example
He was too lazy to clean his room on the weekend.
B2 noun /ˈsɪmbəl/

Symbol

Meaning
a mark or character used as a conventional representation of an object, function, or process
Example
The dove is a symbol of peace.
A1 verb pleɪ

play

Meaning
To have a role or function in a situation; to contribute to something.
Example
Artemis will play a crucial role in Mars exploration.
A2 verb /əˈtæk/

attack

Meaning
to use violence against someone; to criticize strongly
Example
The enemy forces attacked at dawn.
C2 noun /fiːˈkʌndɪti/

fecundity

Meaning
the ability to produce an abundance of offspring or new growth; fertility
Example
The fecundity of the river delta supports diverse wildlife.
B2 verb /klæʃ/

clash

Meaning
to come into conflict or collision with something or someone.
Example
The two cars clashed in the intersection.
B2 adjective /ˈvaɪəbəl/

viable

Meaning
Capable of working successfully; feasible.
Example
A viable solution is necessary for long-term success.
B2 noun /əˈstɒnɪʃmənt/

astonishment

Meaning
Great surprise or amazement.
Example
She looked at the magician with astonishment.
A2 verb /faʊnd/

found

Meaning
to establish or create something; to discover
Example
They founded the company in 1995.
B2 noun /ˈhɑːrd.ʃɪp/

Hardship

Meaning
severe suffering or privation; difficulty or distress
Example
Despite facing many hardships during the war, the family remained united and hopeful.
A2 noun /ˈkrɪk.ɪt/

Cricket

Meaning
a jumping insect that makes a chirping sound by rubbing its wings together
Example
We could hear crickets chirping in the evening.
C1 adjective ˌsəʊsɪəʊpəˈlɪtɪkəl

sociopolitical

Meaning
Combining social and political factors.
Example
Sociopolitical factors often influence public policy decisions.
C2 adjective səˈluː.bri.əs

salubrious

Meaning
Health-giving; healthy; promoting health and well-being.
Example
The mountain air is salubrious and refreshing.
C1 adjective /ʌnˈvɔɪst/

unvoiced

Meaning
not expressed in speech; in phonetics, a sound produced without vocal cord vibration
Example
The student kept her opinion unvoiced during the meeting.
C1 verb /ˈprɪkəl/

prickle

Meaning
to cause a slight stinging or tingling sensation on the skin
Example
Her skin began to prickle in the cold wind.
C2 noun /ˈɪntərˌveɪl/

intervale

Meaning
A low-lying tract of land along a river, usually fertile and flat.
Example
The farmers cultivated crops on the lush intervale by the river.
C1 noun /maɪt/

mite

Meaning
a very small creature, often a tiny arachnid; also used to mean a very small amount
Example
The mattress was infested with dust mites.
B2 adjective /ˈneɪ.kɪd/

Naked

Meaning
without clothes or covering; bare; exposed; unclothed
Example
The naked truth about the situation shocked everyone.
B2 noun /ˈmes.ɪn.dʒər/

Messenger

Meaning
a person who carries messages or communications between parties
Example
The messenger delivered important battle plans to the commander.
A1 pronoun /ˈsʌmwʌn/

someone

Meaning
a person, but not specifically known or named
Example
Someone left their umbrella in the hallway.
B1 adverb /ˈpɜː.mə.nənt.li/

permanently

Meaning
in a way that lasts or remains unchanged for a long time or forever
Example
She moved to the city permanently after finishing her studies.
A2 verb /pruːv/

prove

Meaning
to show that something is true; to demonstrate
Example
The evidence will prove his innocence.
A2 noun /ɪˈkwɪpmənt/

equipment

Meaning
the necessary tools, machines, or other items needed for a particular purpose
Example
The laboratory bought new equipment for research.
B1 adjective /rɪˈlɪdʒəs/

Religious

Meaning
relating to or believing in a religion; devout; spiritual;
Example
He comes from a very religious family.
B1 adjective /ɪmˈpeɪʃənt/

impatient

Meaning
Not able to wait calmly; restless and eager for something to happen.
Example
She grew impatient while waiting in the long queue.
C1 noun /ˈsɪn.ɪˌsɪz.əm/

cynicism

Meaning
An inclination to believe that people are motivated purely by self-interest; skepticism.
Example
His cynicism made it hard for him to trust anyone.
C1 noun /juːˈtoʊpiə/

utopia

Meaning
An imagined perfect society or place where everything is ideal.
Example
Many philosophers dreamed of creating a utopia for humanity.
A1 noun /naɪn/

nine

Meaning
the number that is one more than eight
Example
She has nine books in her collection.
A1 noun /kʌp/

Cup

Meaning
a small, round container, typically with a handle, used for drinking tea, coffee, or other hot beverages
Example
She drank tea from her favorite ceramic cup.
A1 noun /taʊn/

town

Meaning
a human settlement smaller than a city
Example
The town was quiet on Sundays.
C2 noun /ˈdæl.i.əns/

Dalliance

Meaning
a casual romantic or sexual relationship; a brief involvement or experiment
Example
His dalliance with photography lasted only a few months before he lost interest.
C1 noun /ˈkɒndjuɪt/ or /ˈkɑːnduɪt/

conduit

Meaning
a channel or pipe for conveying water, electricity, or information
Example
The cable was placed inside a protective conduit.
C1 noun /ˈkʌvənənt/

covenant

Meaning
a formal agreement or promise, often legally binding
Example
The landlord and tenant signed a covenant to maintain the property.
C1 verb məˈtæb.ə.laɪz

metabolize

Meaning
Process and use food for growth and to replace tissue, or process other substances in the body.
Example
The liver helps to metabolize toxins.
B2 adjective /ˈklɪn.ɪ.kəl/

clinical

Meaning
Related to the observation and treatment of patients rather than theoretical study.
Example
The doctor conducted a clinical examination.
A1 determiner /sʌtʃ/

such

Meaning
of the type previously mentioned or specified
Example
I have never seen such a beautiful painting.
C1 noun /əˈseɪlənt/

assailant

Meaning
a person who attacks another
Example
The police arrested the assailant at the scene.
C1 adjective ɪnˈsaɪ.sɪv

incisive

Meaning
Intelligently analytical and clear-thinking; showing clear thought and good understanding of what is important.
Example
His incisive comments revealed the core issues.
C1 adjective /tɛkˈtɑː.nɪk/

tectonic

Meaning
Relating to the structure of the earth's crust and the large-scale processes that take place within it.
Example
Tectonic movements cause earthquakes and mountain formation.
C2 noun /ˈæntɪˌtʃeɪmbər/

antechamber

Meaning
a small room serving as an entry to a larger one
Example
The guests waited in the antechamber before being admitted to the hall.
C1 noun /ˈrɪɡər/

rigor

Meaning
strictness, severity, or demanding conditions
Example
The training was carried out with great rigor.
C1 noun /pərˈveɪər/

purveyor

Meaning
a person or business that supplies goods, services, or information
Example
He is a well-known purveyor of fine wines.
B1 noun /ˌfɜːrst eɪd kɪt/

first aid kit

Meaning
A collection of medical supplies for giving initial treatment in emergencies
Example
I always keep a first aid kit in my car for emergencies.
A1 modal verb /ʃʊd/

should

Meaning
used to indicate obligation or duty
Example
You should study for your exams.
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 noun ˈhaɪ.drə.dʒən ˈpaʊ.əd bʌsɪz

hydrogen-powered buses

Meaning
Buses powered by hydrogen fuel cells that produce only water vapor as emission.
Example
Hydrogen-powered buses reduce air pollution.
B2 adjective /ˈtruːθ.fəl/

Truthful

Meaning
telling or expressing the truth; honest and sincere
Example
She was always truthful in her answers during the interview.
C2 noun /ˈpɜːrsɪflɑːʒ/

persiflage

Meaning
light and slightly contemptuous mockery or banter
Example
Their conversation was full of persiflage and jokes.
B2 noun /ˈtruːθ.fəl.nəs/

Truthfulness

Meaning
the quality of being truthful; honesty and accuracy in what one says or does
Example
Her truthfulness in the investigation helped solve the case quickly.
C2 adjective /dɪˈmɒtɪk/

demotic

Meaning
relating to ordinary people or everyday language
Example
The poet used demotic language to connect with common readers.
B2 noun ˈæsɪd reɪn

acid rain

Meaning
Rainfall made acidic by atmospheric pollution, especially from industrial emissions.
Example
Acid rain damages crops and buildings.
B1 adjective /ˈfæbjələs/

Fabulous

Meaning
extremely good; wonderful; extraordinary
Example
She wore a fabulous dress to the party.
A2 noun /ˈpækɪdʒ/

package

Meaning
a container or wrapping in which something is packed
Example
He received a package in the mail.
B1 noun ɡlæns

glance

Meaning
A quick or brief look.
Example
He glanced at the river and felt calm.
B2 adjective /ˈjuː.nɪ.faɪd/

unified

Meaning
Made into a whole or joined together.
Example
A unified approach fosters better outcomes.
C2 verb /ˈvaɪtəlaɪz/

vitalize

Meaning
To give life, energy, or strength to something.
Example
Fresh air and exercise can vitalize the body and mind.
B2 adjective /ˈveɪ.kənt/

Vacant

Meaning
empty; not occupied; available
Example
There is a vacant apartment on the second floor.
C2 noun /ˈɛpɪˌsaɪkl/

epicycle

Meaning
a small circle whose center moves around the circumference of a larger one, used in ancient astronomy
Example
The concept of the epicycle was used to explain planetary motion.
C2 verb /ˌɡeɪnˈseɪ/

gainsay

Meaning
To deny, contradict, or speak against.
Example
No one could gainsay the evidence presented in court.
A2 adjective/noun /ˈɪndiən/

indian

Meaning
Relating to India, its people, or their culture.
Example
She loves Indian food, especially biryani.
C1 noun /ˈkwɒn.dər.i/

Quandary

Meaning
a difficult situation where you cannot decide what to do; dilemma
Example
She was in a quandary about which job offer to accept.
B2 noun, verb /striːk/

streak

Meaning
a long, thin line or mark; to move very quickly in a specified direction
Example
Lightning streaked across the night sky.
B1 noun /nɛt/

net

Meaning
a piece of material made of threads or ropes woven together, used to catch or hold things
Example
The fisherman cast his net into the sea.
C1 noun rɪˈdɛmpʃən

redemption

Meaning
The action of saving or being saved from sin, error, or evil.
Example
The story highlights the theme of redemption.
C2 verb /kwɒf/

quaff

Meaning
to drink something heartily or in large gulps, especially an alcoholic drink
Example
He quaffed a mug of ale after the long day.
C1 adverb /ɪnˈdɛfɪnətli/

indefinitely

Meaning
for an unlimited or unspecified period of time
Example
The project has been postponed indefinitely.
B2 adjective /dæmp/

damp

Meaning
slightly wet, often in an unpleasant way
Example
The room felt cold and damp after the rain.
C2 noun /ˈleʧ.ər/

Lecher

Meaning
a man who behaves in a sexually inappropriate way towards women
Example
The company fired him for being a lecher.
C1 adjective /ˌɪnɑːrˈtɪkjʊlət/

inarticulate

Meaning
Unable to express oneself clearly or effectively in speech or writing.
Example
She became inarticulate with emotion during the speech.
B1 noun /ˈen.tri/

Entry

Meaning
an act of going or coming in; an item written or printed in a record
Example
His entry into the competition was submitted just before the deadline.
B2 adjective /ˌʌn.kəʊˈɒp.ər.ə.tɪv/

uncooperative

Meaning
not willing to help or work with others; unhelpful
Example
The witness was uncooperative and refused to answer questions.
B2 noun /wɜːrld ɪnˈvaɪrənmənt deɪ/

World Environment Day

Meaning
An annual global event celebrated on June 5 to raise awareness about environmental protection and encourage action for environmental conservation.
Example
World Environment Day is celebrated every year on June 5.
C2 verb /ˈmæɡnɪtaɪz/

magnetize

Meaning
to make something magnetic or to strongly attract
Example
The scientist managed to magnetize the iron rod.
C1 noun /ˈfoʊliɪdʒ/

foliage

Meaning
The leaves of a plant, collectively.
Example
The autumn foliage looked stunning in the park.
C1 adjective ˌɡæs.troʊ.ɪnˈtes.tɪ.nəl

gastrointestinal

Meaning
Relating to the stomach and intestines.
Example
Spicy food can cause gastrointestinal issues.
C1 adjective dɪˈskrɪmɪnətɔːri

discriminatory

Meaning
Making or showing an unfair or prejudicial distinction between different categories of people or things.
Example
Discriminatory policies triggered protests.
C1 noun /rɪˈkɒnɪsəns/

reconnaissance

Meaning
A survey or exploration, especially for military or strategic purposes.
Example
The soldiers conducted a reconnaissance of the enemy camp.
A2 verb /feɪl/

fail

Meaning
to not succeed in achieving something; to be unsuccessful
Example
He failed to complete the assignment on time.
C1 noun /ˈblæs.fə.mi/

blasphemy

Meaning
the act of speaking disrespectfully about God or sacred things
Example
In some countries, blasphemy is a punishable offense.
B2 noun /kəˈroʊnə/

corona

Meaning
a crown or crown-like structure; also refers to the outer atmosphere of the sun
Example
The sun's corona was visible during the total solar eclipse.
C2 noun /ˈhɒthɛd/

hothead

Meaning
a person who acts quickly and without thinking when angry
Example
He is such a hothead that he often starts arguments.
A2 adjective ˈɡləʊ.bəl

global

Meaning
Relating to the whole world; worldwide.
Example
Global collaboration improves connectivity.
B2 verb ˈwɜːrsən

worsen

Meaning
To make or become worse; to deteriorate in quality, condition, or degree.
Example
Lack of education can worsen poverty levels.
A2 noun /kɑːrˈtuːn/

cartoon

Meaning
a humorous or animated drawing, especially one in newspapers or television
Example
Children love watching cartoons on TV.
C2 adjective /splɪˈnɛtɪk/

splenetic

Meaning
bad-tempered, irritable, spiteful
Example
His splenetic remarks offended everyone in the room.
C1 adjective /ˌmiː.diˈoʊ.kər/

mediocre

Meaning
Of only average quality; not very good.
Example
The movie was entertaining but overall mediocre.
C1 noun /ˈpɒlɪɡɒn/

polygon

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