tortuous
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C1 adjective /ˈtɔːrtʃuəs/

tortuous

Meaning
Full of twists and turns; excessively complex or complicated.
Example
The tortuous mountain road made driving very difficult.
C1 adjective /ɑːrˈkeɪn/

arcane

Meaning
understood by few; mysterious or secret
Example
The professor’s lecture was full of arcane details that only specialists could follow.
C1 adjective ɔːɡˈmen.tɪd

augmented

Meaning
having been made greater in size or value.
Example
The new software provided augmented reality features.
C1 noun /ˈfoʊliɪdʒ/

foliage

Meaning
The leaves of a plant, collectively.
Example
The autumn foliage looked stunning in the park.
C1 noun ˌsʌb.sɪ.dɪˈzeɪ.ʃən

subsidization

Meaning
Financial assistance provided by government to make certain goods or services more affordable.
Example
Subsidization of agriculture helps farmers maintain crop production.
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 verb /paʊt/

pout

Meaning
to push one's lips forward as an expression of annoyance or sulkiness
Example
The child began to pout when he didn’t get the toy.
C1 verb /əˈpɛnd/

append

Meaning
to add something as an attachment or supplement, usually at the end of a document or list
Example
She decided to append a note to the end of the report.
C1 noun /ˈɡaɪ.zər/

geyser

Meaning
A natural hot spring that intermittently ejects a column of water and steam into the air.
Example
The geyser erupted, shooting water high into the sky.
C1 adjective ˈɑː.dʒu.əs

arduous

Meaning
Involving or requiring strenuous effort; difficult and tiring.
Example
The trek through the mountains was an arduous journey.
C1 adjective /ɪnˈvɪnsəbl/

invincible

Meaning
too powerful to be defeated or overcome
Example
The team seemed invincible after winning ten matches in a row.
C1 noun /pərˈvɜːrʒən/

perversion

Meaning
The act of distorting or corrupting the original meaning, purpose, or state of something.
Example
The regime’s censorship was seen as a perversion of free speech.
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 noun /krʌks/

crux

Meaning
the most important or decisive point of an issue
Example
The crux of the problem lies in poor communication.
C1 adjective /ˈmel.əʊ/

Mellow

Meaning
soft and pleasant; relaxed and gentle
Example
The mellow evening light created a peaceful atmosphere.
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 noun /ˈsæl.mən fɪʃ / ˈroʊ.huː/

Salmon fish / Rohu

Meaning
a freshwater fish popular in South Asian cuisine; also refers to salmon which is a different species
Example
Rohu fish is commonly prepared with spices in Bengali households.
C1 adjective /ˈwɪl.fəl/

Wilful

Meaning
deliberately stubborn; done on purpose; intentional
Example
His wilful disobedience led to punishment.
C1 verb /pərˈplɛks/

perplex

Meaning
To confuse or puzzle someone.
Example
The complex instructions perplexed the students.
C1 noun /nɒb/

Knob

Meaning
a rounded handle on a door or drawer; a small rounded switch on a machine
Example
He turned the brass knob to open the old wooden door.
C1 adjective /ɪnˈfriːkwənt/

infrequent

Meaning
Happening rarely or not often.
Example
He made infrequent visits to his hometown after moving abroad.
C1 adjective ˈfjuː.taɪl

futile

Meaning
Incapable of producing any useful result; pointless.
Example
His attempts to change the situation were futile.
C1 noun /ˈdræm.ə.tɪst/

dramatist

Meaning
a person who writes plays
Example
Shakespeare is one of the greatest dramatists in history.
C1 noun /ˈpriː.tekst/

Pretext

Meaning
a reason given in justification of a course of action that is not the real reason
Example
He used illness as a pretext to avoid the meeting.
C1 verb /ˈpruːfˌriːd/

proofread

Meaning
to read written material and mark any errors
Example
She proofread the report before submission.
C1 noun /əˈdʒeɪsənsi/

adjacency

Meaning
The state of being next to or adjoining something else.
Example
The adjacency of the two buildings made it easy to connect them.
C1 adjective /ˈɑːrɡjuəbl/

arguable

Meaning
open to debate or discussion; not certain and capable of being argued for or against
Example
It is arguable that technology has improved our quality of life.
C1 verb /kənˈtɛkstʃuəlaɪz/

contextualize

Meaning
to place something in a context or interpret it in relation to its surroundings
Example
The teacher contextualized the historical event to make it more relevant for students.
C1 verb /smɪr/

smear

Meaning
to spread or apply a substance messily; to damage someone's reputation with false or unfair words
Example
The child smeared paint across the wall.
C1 noun /ˈpeɪθɒs/

pathos

Meaning
a quality in speech, writing, or events that evokes pity or deep emotion
Example
The documentary balanced pathos with hope, making the audience both weep and think.
C1 noun/adjective /ˈmæm.əθ/

mammoth

Meaning
An extinct large elephant-like animal with long curved tusks; also means something huge.
Example
The company faced a mammoth challenge during expansion.
C1 verb /ˈæbdɪkeɪt/

abdicate

Meaning
To give up a position of power or responsibility, especially a throne.
Example
The king decided to abdicate the throne.
C1 adjective /ˈprɪs.tiːn/

pristine

Meaning
In its original condition; unspoiled, clean, and fresh.
Example
The forest remains in a pristine condition.
C1 noun /ˈhɜːrbɪsaɪd/

herbicide

Meaning
A chemical substance used to kill unwanted plants, especially weeds.
Example
Farmers used herbicide to protect their crops from invasive weeds.
C1 noun /beɪl/

bail

Meaning
the temporary release of an accused person awaiting trial, often with a financial guarantee
Example
He was granted bail after his arrest.
C1 adjective /ˈɒm.ɪ.nəs/

Ominous

Meaning
giving the impression that something bad will happen; threatening; foreboding
Example
The dark clouds looked ominous before the storm.
C1 noun /ˈmɪmɪkri/

mimicry

Meaning
The act of imitating someone or something, often for humor or learning.
Example
The comedian’s mimicry of celebrities made the audience laugh.
C1 noun ɪˌræʃ.ənˈæl.ɪ.ti

irrationality

Meaning
The quality of being illogical or unreasonable; lack of rational thought.
Example
His decision was driven by complete irrationality.
C1 adjective /ˈskɔːrnfəl/

Scornful

Meaning
showing contempt or disdain; expressing scorn
Example
She gave him a scornful look when he made the rude comment.
C1 noun /ˈmɛləˌdrɑːmə/

melodrama

Meaning
A dramatic piece with exaggerated characters and exciting events intended to appeal to the emotions.
Example
The movie was criticized for its excessive melodrama.
C1 adjective /ʌnˈvaɪəbl/

unviable

Meaning
Not capable of working successfully; not feasible or practical.
Example
The project was deemed unviable due to high costs.
C1 noun /ˈlɛktən/

lectern

Meaning
A tall stand with a sloping top used to support a book, notes, or script during a speech or lecture.
Example
The professor placed her notes on the lectern before starting her lecture.
C1 verb /dɪsˈhɑːrtn/

dishearten

Meaning
to cause someone to lose determination or confidence; to discourage
Example
The constant rejection letters began to dishearten the young writer.
C1 noun /ˌɪnsɪɡˈnɪfɪkəns/

insignificance

Meaning
The quality of being unimportant or trivial.
Example
He felt a sense of insignificance in the vast universe.
C1 verb /ɪnˈkɑːrsəreɪt/

incarcerate

Meaning
to imprison or confine someone
Example
The authorities incarcerated the criminal after the trial.
C1 noun /ˈskælpəl/

scalpel

Meaning
A small and extremely sharp bladed instrument used for surgery and dissection.
Example
The surgeon carefully used a scalpel to make the first incision.
C1 verb /ˌʌndərˈvæljuː/

undervalue

Meaning
To assign too low a value or importance to something or someone.
Example
She felt that her boss consistently undervalued her contributions.
C1 noun /ˈpraɪ.mər/ (US), /ˈprɪm.ər/ (UK)

primer

Meaning
A basic introductory book or a substance used to prepare a surface for painting.
Example
He read a primer on programming before starting his course.
C1 noun /ˈɪtʃ.i.nəs/

itchiness

Meaning
The quality or condition of feeling an irritating sensation on the skin that causes a desire to scratch.
Example
Eye itchiness often leads to rubbing.
C1 verb /prəˈkræs.tɪ.neɪt/

procrastinate

Meaning
To delay or postpone action; to put off doing something, especially out of habitual carelessness or laziness.
Example
He tends to procrastinate when facing difficult tasks.
C1 adjective /ˈmɪnəskjuːl/

minuscule

Meaning
extremely small in size or importance
Example
She made only a minuscule contribution to the project.
C1 noun /daɪˈvɜː.ʃən/

Diversion

Meaning
the action of turning something aside from its course; an activity that diverts the mind
Example
The road closure forced a diversion through the countryside for all travelers.
C1 adjective /ˈluːdɪkrəs/

ludicrous

Meaning
so foolish, unreasonable, or out of place as to be amusing
Example
It is ludicrous to think the Earth is flat.
C1 noun /kəmˈpəʊ.ʒər/

composure

Meaning
The state or feeling of being calm and in control of oneself.
Example
She maintained her composure during the interview.
C1 adjective /ˈbeɪs.ləs/

Baseless

Meaning
without foundation; groundless; unfounded
Example
The accusations against him were completely baseless.
C1 verb /ˈrek.ən.saɪl/

reconcile

Meaning
Restore friendly relations between; cause to coexist in harmony.
Example
They tried to reconcile their differences through open communication.
C1 verb /ˈkwentʃɪŋ/

quenching

Meaning
The act of satisfying thirst or extinguishing something like fire.
Example
Drinking cold water was quenching her thirst.
C1 adjective /ɪˈmuː.və.bəl/

immovable

Meaning
Not able to be moved; fixed in position.
Example
Immovable barriers prevent change.
C1 verb /dʒəʊlt/

jolt

Meaning
to push or shake someone or something abruptly and roughly
Example
The sudden stop jolted all the passengers forward.
C1 noun /ˈpɛsəl/

pestle

Meaning
A heavy tool with a rounded end used for crushing or grinding substances in a mortar.
Example
She used a pestle to grind the spices.
C1 noun /rɪˈsaɪtl/

recital

Meaning
A performance of music, dance, or poetry, usually by a soloist.
Example
She gave a piano recital at the concert hall.
C1 verb /ˈnɪbəl/

nibble

Meaning
to take small bites of food
Example
The rabbit nibbled on a carrot.
C1 noun /ˈbɪɡ.ət/

bigot

Meaning
A person who is intolerant toward those holding different opinions or beliefs.
Example
He was called a bigot for refusing to listen to others' views.
C1 noun ˌɒp.tɪ.maɪˈzeɪ.ʃən

optimization

Meaning
Improving processes to increase performance and efficiency.
Example
SEO optimization helps websites rank higher on search engines.
C1 adjective /ˈskeɪðɪŋ/

scathing

Meaning
severely critical; harshly scornful
Example
The critic wrote a scathing review of the movie.
C1 verb /ˈreɪdieɪt/

radiate

Meaning
to emit energy or light; to spread out from a center
Example
The fireplace radiates warmth throughout the room.
C1 noun /ˈɔr.ə.tər/

Orator

Meaning
a public speaker, especially one who is eloquent or skilled in speaking
Example
The famous orator delivered an inspiring speech.
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 adjective /əˈvɜːrs/

averse

Meaning
having a strong dislike of or opposition to something
Example
He was averse to taking unnecessary risks.
C1 adjective /ɪmˈpɛn.ɪ.trə.bəl/

impenetrable

Meaning
Impossible to pass through or enter; impossible to understand.
Example
The dense forest was nearly impenetrable.
C1 verb /dɪˈflɛkt/

deflect

Meaning
to cause something to change direction; to avoid answering directly
Example
The shield deflected the incoming arrow.
C1 noun ˌfræɡ.mənˈteɪ.ʃən

fragmentation

Meaning
The process or state of breaking or being broken into fragments.
Example
Habitat fragmentation threatens many species.
C1 verb /kraʊtʃ/

crouch

Meaning
to bend your knees and lower your body close to the ground
Example
The cat crouched before leaping at its prey.
C1 adjective, noun /ˈkɑːr.dɪ.nəl/

cardinal

Meaning
As an adjective: of prime importance; as a noun: a high-ranking Catholic clergyman or a type of bird.
Example
Honesty is a cardinal virtue in life.
C1 verb /ˈæɡənaɪz/

agonize

Meaning
To suffer extreme physical or mental pain; to spend time worrying.
Example
She agonized for days over whether she had made the right decision.
C1 verb /ɪnˈstɪl/

instill

Meaning
to gradually but firmly establish an idea, attitude, or habit in someone's mind
Example
Parents try to instill good values in their children.
C1 noun /əˈsæsɪn/

Assassin

Meaning
a person who murders an important person for political or religious reasons
Example
The president was protected from potential assassins by security guards.
C1 noun /ˌpænəˈsiːə/

panacea

Meaning
A solution or remedy for all difficulties or diseases.
Example
Education is often seen as a panacea for social problems.
C1 noun /ˈbʊl.ək/

Bullock

Meaning
a young bull; a castrated bull used for farm work
Example
The farmer used a bullock to plow the field.
C1 noun /beɪl/

bale

Meaning
A large bundle of goods tightly wrapped and bound.
Example
The workers loaded the bale of cotton onto the truck.
C1 noun /ˈreɪ.biːz/

rabies

Meaning
A viral disease that causes inflammation of the brain in humans and other mammals, usually transmitted through animal bites.
Example
The dog was vaccinated against rabies.
C1 adjective /ˈtʌtʃi/

Touchy

Meaning
easily upset or offended; overly sensitive
Example
He's very touchy about his height.
C1 verb /ɪˈnɔːɡjʊreɪt/

inaugurate

Meaning
To formally begin or introduce something, especially with a ceremony.
Example
The mayor will inaugurate the new bridge tomorrow.
C1 noun ˌmiː.diˈɒk.rə.ti

mediocrity

Meaning
Being average or ordinary, not particularly good.
Example
He refused to settle for mediocrity and aimed for greatness.
C1 noun /ˈprɒdɪdʒi/

prodigy

Meaning
a person, especially a young one, with exceptional talents or abilities
Example
Mozart was a child prodigy in music.
C1 noun /ˈmæksɪm/

maxim

Meaning
a short, well-known statement expressing a general truth or rule of conduct
Example
Honesty is a timeless maxim valued in every culture.
C1 noun /ˌhɑːmənaɪˈzeɪʃən/

harmonization

Meaning
The process of making things compatible or consistent with one another.
Example
The harmonization of different policies ensures consistent results.
C1 noun /kəˈmɪtl̩/

committal

Meaning
The action of sending a person to prison or a mental hospital; also the act of committing something to a particular place.
Example
The judge ordered the committal of the accused to custody.
C1 verb /bɪˈreɪt/

berate

Meaning
to scold or criticize angrily
Example
The teacher berated the student for being late.
C1 noun /ˈruːbrɪk/

rubric

Meaning
A set of instructions, rules, or a heading in a document, often used for grading criteria.
Example
The teacher provided a grading rubric for the assignment.
C1 noun /ʃɑːrd/

shard

Meaning
a broken piece of glass, metal, or pottery
Example
He cut his finger on a shard of glass.
C1 adjective /əˈlʊr.ɪŋ/

Alluring

Meaning
attractive and tempting; fascinating
Example
The alluring fragrance of roses filled the garden.
C1 noun /ˈnaɪt.fɔːl/

nightfall

Meaning
the time when night begins; dusk
Example
They decided to return home before nightfall.
C1 verb /ˈkʌn.dʒər/

conjure

Meaning
to summon something as if by magic; to imagine vividly
Example
The magician conjured a rabbit out of the hat.
C1 noun /mɔːs/

Moss

Meaning
a small flowerless plant that grows in clumps in moist places
Example
Green moss covered the old stone wall.
C1 noun /ˈtraɪ.fəl/

Trifle

Meaning
something of little importance or value; a small amount
Example
Don't worry about such a trifle; it's not worth your time.
C1 verb /dɪsˈpleɪs/

displace

Meaning
to force someone or something out of their usual or original position; to replace or substitute
Example
The new technology will displace many traditional manufacturing jobs.
C1 noun /ˌkɒndʒʊˈɡeɪʃən/

conjugation

Meaning
the variation of the form of a verb to indicate tense, person, and number
Example
French verbs have complex conjugations.
C1 verb /ˈɡlædən/

gladden

Meaning
to make someone happy or bring joy
Example
The news of her recovery gladdened everyone.
C1 noun /kriːd/

creed

Meaning
A system of religious or spiritual beliefs or a guiding principle.
Example
Freedom of speech is part of his personal creed.
C1 adjective /ˈstɒdʒi/

stodgy

Meaning
Dull, uninspired, or old-fashioned; also heavy and hard to digest when referring to food.
Example
The lecture was so stodgy that many students struggled to stay awake.
C1 verb /ɪˈvɪkt/

evict

Meaning
To expel someone from a property, usually by legal process.
Example
The landlord decided to evict the tenants for not paying rent.
C1 noun /ˈmuːdi.nəs/

moodiness

Meaning
The state of being frequently subject to changes in mood, especially irritability or sadness.
Example
Her moodiness made it difficult to predict how she would react.
C1 noun /ləˈɡuːn/

lagoon

Meaning
A shallow body of water separated from the sea by sandbars or reefs.
Example
We swam in the calm waters of the lagoon.
C1 verb /ˌmɪsˈkaʊnt/

miscount

Meaning
To count wrongly or inaccurately.
Example
He miscounted the number of chairs in the hall.
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 /ˈswoʊlən/

swollen

Meaning
Enlarged or puffed up, usually due to injury, inflammation, or fluid accumulation
Example
Her ankle was swollen after she twisted it during the hike.
C1 adjective /ˈfliː.tɪŋ/

fleeting

Meaning
Lasting for a very short time; passing quickly.
Example
Happiness can be fleeting, so cherish every moment.
C1 noun /wɪsp/

wisp

Meaning
A small thin or twisted bunch, piece, or amount of something.
Example
A wisp of smoke rose from the chimney.
C1 adjective /ˌaʊt ən ˈaʊt/

out-and-out

Meaning
complete; absolute; used to emphasize something extreme
Example
The speech was an out-and-out lie.
C1 adjective /ˈærɪd/

arid

Meaning
extremely dry; lacking in interest or excitement
Example
The desert is known for its arid climate.
C1 adjective /bəˈlɪdʒ.ər.ənt/

belligerent

Meaning
Hostile and aggressive, ready to fight or argue.
Example
His belligerent attitude often leads to conflicts.
C1 noun /ˈstrɑːtəm/

stratum

Meaning
a layer or level of material, or a social class in society
Example
The upper stratum of society enjoyed privileges not available to others.
C1 adjective /koʊˈɜːrsɪv/

coercive

Meaning
Relating to or using force or threats to make someone do something.
Example
The government faced criticism for adopting coercive measures against protestors.
C1 adjective /pəˈrɪfərəl/

peripheral

Meaning
Relating to or situated on the edge or outer parts of something.
Example
The town is located on the peripheral area of the city.
C1 adjective /riˈæk.tɪv/

Reactive

Meaning
responding to situations rather than initiating them; chemically active
Example
The company took a reactive approach to customer complaints.
C1 adjective /ˈplaɪənt/

pliant

Meaning
flexible; easily influenced or adaptable
Example
She has a pliant personality that adapts well to new situations.
C1 noun /dɪˈfɛkʃən/

defection

Meaning
The act of abandoning one’s country, cause, or group in favor of another.
Example
The politician’s defection shocked his supporters.
C1 adjective /rɪˈvenʒ.fəl/

Revengeful

Meaning
seeking or desiring revenge; vindictive
Example
He became revengeful after being betrayed by his friend.
C1 adjective /ˈræmpənt/

rampant

Meaning
existing or spreading unchecked, often in an undesirable way
Example
Corruption was rampant in the city administration.
C1 verb /ˌriː.kənˈviːn/

reconvene

Meaning
to gather or assemble again, especially for a meeting
Example
The committee will reconvene after lunch.