dissatisfy
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C1 verb /dɪsˈsætɪsfaɪ/

dissatisfy

Meaning
to fail to please or meet expectations; to make someone unhappy
Example
The poor service dissatisfies many customers.
C1 verb /ˌdɪsɪnˈɡeɪdʒ/

disengage

Meaning
To release or detach oneself from something; to withdraw.
Example
He tried to disengage from the heated argument.
C1 noun /daɪˈsɛkʃən/

dissection

Meaning
the act of cutting apart or analyzing something in detail, especially a body or structure
Example
The dissection of the specimen revealed important details about its structure.
C1 noun dɪˌzɝː.t̬ə.fɪˈkeɪ.ʃən

desertification

Meaning
The process by which fertile land becomes desert, typically as a result of drought, deforestation, or inappropriate agriculture.
Example
Deforestation accelerates desertification.
C1 noun /dɪˈvɪnɪti/

divinity

Meaning
The quality or state of being divine; a deity.
Example
The priest spoke about the divinity of the soul.
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 /ˌdɛrɪˈveɪʃən/

derivation

Meaning
The origin or development of something from a source.
Example
The derivation of the word comes from Latin.
C1 noun dɪˈtɜː.mɪ.nənt

determinant

Meaning
A factor that decisively affects the nature or outcome of something.
Example
Education is a key determinant of success.
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 verb /dɪˈflɛkt/

deflect

Meaning
to cause something to change direction; to avoid answering directly
Example
The shield deflected the incoming arrow.
C1 adjective /dɪˈskriːt/

discrete

Meaning
individually separate and distinct
Example
The course is divided into three discrete modules.
C1 noun /ˈdæɡ.ər/

Dagger

Meaning
a short knife with a pointed blade used as a weapon
Example
The ancient warrior carried a silver dagger.
C1 noun dɪˈfleɪʃən

deflation

Meaning
Reduction of the general level of prices in an economy.
Example
Deflation often leads to decreased consumer spending.
C1 noun /ˈdel.ɪ.kə.si/

Delicacy

Meaning
fineness of texture or structure; a choice or expensive food; sensitivity in handling
Example
The chef prepared a local delicacy that was famous throughout the region.
C1 noun /dɪˈfɪʃ.ən.si/

Deficiency

Meaning
a lack or shortage of something; inadequacy or insufficiency
Example
The doctor diagnosed a vitamin D deficiency in the patient's blood test.
C1 noun /ˌdɪp.ləˈmæt.ɪk ˈmaɪl.stəʊn/

diplomatic milestone

Meaning
A significant achievement or important event in diplomatic relations.
Example
Hosting the summit was a diplomatic milestone.
C1 verb /diːˈfɒrɪst/

deforest

Meaning
to clear an area of trees, usually on a large scale
Example
The region has been heavily deforested for agriculture.
C1 noun /dɪsˈlɛksiə/

dyslexia

Meaning
A learning disorder characterized by difficulty reading due to problems identifying speech sounds and decoding words.
Example
The teacher used special methods to help the student with dyslexia.
C1 noun /ˌdɪsərˈteɪʃən/

dissertation

Meaning
A long piece of writing on a particular subject, usually written for a university degree.
Example
She spent two years writing her doctoral dissertation.
C1 noun /dɪsˈsɜːrvɪs/

disservice

Meaning
A harmful action; something that does damage rather than help.
Example
Spreading false information is a disservice to the community.
C1 noun ˌdjʊə.rəˈbɪl.ə.ti

durability

Meaning
The ability to withstand wear, pressure, or damage; hard-wearing.
Example
The durability of materials affects performance.
C1 verb /dɪˈpɔːrt/

deport

Meaning
To expel a foreigner from a country, usually for legal or political reasons.
Example
The government decided to deport the illegal immigrants.
C1 noun /ˈdrɛsˌmeɪkər/

dressmaker

Meaning
A person who makes or alters women's clothing professionally.
Example
The dressmaker crafted a beautiful gown for the bride.
C1 verb /dɪˈnəʊt/

denote

Meaning
To be a sign of; to indicate or mean something.
Example
A red flag denotes danger.
C1 noun /ˌdaɪəˈrɑːmə/

diorama

Meaning
a three-dimensional model representing a scene, often with miniature figures
Example
The museum displayed a diorama of an ancient village.
C1 phrase ˌdɪp.ləˈmæt.ɪk rɛz.əˈluː.ʃən

diplomatic resolution

Meaning
A peaceful solution to conflicts through negotiation and diplomatic channels.
Example
A diplomatic resolution is necessary for peace.
C1 verb /dɪˈpliːt/

deplete

Meaning
to reduce the quantity or supply of something
Example
The long war has depleted the country's resources.
C1 verb /dɪˈsɛnt/

dissent

Meaning
To hold or express opinions that are different from those officially accepted.
Example
Several members dissented from the majority decision.
C1 noun ˈdɪskɔrd

discord

Meaning
Disagreement or conflict between people or ideas.
Example
Discord among people disrupts societal stability.
C1 adjective /dɪˈskrɪmɪˌneɪtɪŋ/

discriminating

Meaning
Having refined taste or good judgment; able to recognize subtle differences.
Example
She is known for her discriminating taste in art.
C1 adjective dɒɡˈmæt.ɪk

dogmatic

Meaning
Being inclined to lay down principles as incontrovertibly true; characterized by arrogant assertion of unproven principles.
Example
His dogmatic approach to politics made discussions difficult.
C1 noun, adjective /dɪˈrɪvətɪv/

derivative

Meaning
Something that is based on another source; in math, a measure of how a function changes.
Example
The film was criticized for being too derivative of earlier works.
C1 noun /ˈdaɪnəˌmoʊ/

dynamo

Meaning
A machine that generates electricity; a person with great energy and enthusiasm.
Example
She is the real dynamo behind the success of the company.
C1 verb /dɪˈtrækt/

detract

Meaning
To reduce or take away the worth or value of something.
Example
His rude behavior will detract from his good reputation.
C1 verb /ˈdɪs.ɪ.peɪt/

dissipate

Meaning
To disappear or cause to disappear gradually.
Example
The tension in the room slowly dissipated.
C1 adjective /ˈdɒɡɪd/

dogged

Meaning
showing stubborn determination and persistence
Example
She succeeded through dogged determination.
C1 verb /dɪsˈɑːrm/

disarm

Meaning
to take weapons away from someone; to make someone feel less hostile
Example
The soldiers were ordered to disarm the rebels.
C1 noun dɪˈsʌɪsɪvnɪs

decisiveness

Meaning
The ability to make decisions quickly and effectively.
Example
His decisiveness during the crisis saved the company.
C1 noun /deɪˈbɑː.kəl/

debacle

Meaning
A sudden and ignominious failure; a fiasco.
Example
The company's poor management led to a financial debacle.
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 verb /ˈdɪsləkeɪt/

dislocate

Meaning
To disturb the normal position of something, especially a joint in the body.
Example
He dislocated his shoulder while playing football.
C1 noun /ˈdiːviəns/

deviance

Meaning
Behavior that differs from accepted social or moral standards.
Example
The book studies deviance in urban youth culture.
C1 adjective /dæft/

daft

Meaning
Silly or foolish.
Example
It was a daft idea to go hiking without water.
C1 noun /ˈdɑː.mə.saɪl/

domicile

Meaning
A person's legal residence or permanent home.
Example
He declared Canada as his legal domicile.
C1 noun /dɪˌsem.ɪˈneɪ.ʃən/

dissemination

Meaning
The action or fact of spreading something, especially information, widely.
Example
The dissemination of false information is a major issue.
C1 verb /daɪˈvɜːrdʒ/

diverge

Meaning
to separate and go in different directions; to differ
Example
The two paths diverge at the fork in the road.
C1 adjective /ˈdrɪəri/

dreary

Meaning
dull, bleak, and lifeless; depressing
Example
The long, dreary winter made everyone feel gloomy.
C1 verb /dɪsˈkleɪm/

disclaim

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

dilapidated

Meaning
Fallen into disrepair or ruin due to neglect or age.
Example
The family lived in a dilapidated house at the edge of town.
C1 noun /dɪˈlɪriəm/

delirium

Meaning
An acutely disturbed state of mind characterized by restlessness, illusions, and incoherence.
Example
The patient experienced delirium after the surgery due to the strong medication.
C1 noun /ˌdiːˈmer.ɪt/

Demerit

Meaning
a fault or disadvantage; a mark given for a fault or offense
Example
The student received a demerit for arriving late to class repeatedly.
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 /ˈdɪsɪdənt/

dissident

Meaning
A person who opposes official policy, especially that of an authoritarian state.
Example
The dissident was arrested for speaking against the government.
C1 verb ˈdwɪn.dl

dwindle

Meaning
To diminish gradually in size, amount, or strength; to become progressively smaller.
Example
His savings dwindled due to unexpected expenses.
C1 noun /ˈdɛsɪˌbɛl/

decibel

Meaning
a unit used to measure the intensity of sound
Example
The noise level in the factory exceeded 90 decibels.
C1 adjective /dɪsˈkwaɪətɪŋ/

disquieting

Meaning
Causing worry, unease, or anxiety.
Example
The news report was deeply disquieting to the public.
C1 noun /ˌdɪstɪˈleɪʃən/

distillation

Meaning
The process of purifying a liquid by heating and cooling; the extraction of the essential meaning.
Example
Distillation is commonly used to produce alcoholic beverages.
C1 adjective /dɪˈvɔɪd/

devoid

Meaning
Completely lacking or without something.
Example
His speech was devoid of any real emotion.
C1 verb /ˈdæb.əl/

dabble

Meaning
To take part in an activity in a casual or superficial way.
Example
He dabbled in painting during his college days.
C1 verb /ˌdɪsɪnˈtæŋɡl/

disentangle

Meaning
To free something or someone from a tangle or complication.
Example
She tried to disentangle her hair from the branches.
C1 verb /daɪˈvɛst/

divest

Meaning
to strip away possessions, rights, or assets; to rid oneself of
Example
The company decided to divest its unprofitable division.
C1 adjective /dɪˈspɒndənt/

despondent

Meaning
feeling or showing deep hopelessness or discouragement
Example
She felt despondent after losing her job.
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 noun /ˈdɑːsieɪ/

dossier

Meaning
A collection of documents about a particular person, event, or subject.
Example
The lawyer presented a dossier of evidence to the court.
C1 verb dɪˈlɪnieɪt

delineate

Meaning
To describe or portray something precisely
Example
The artist delineated the scene in intricate detail.
C1 noun /ˌdep.rɪˈveɪ.ʃən/

deprivation

Meaning
The damaging lack of material benefits considered to be basic necessities in a society.
Example
Sleep deprivation affects cognitive function.
C1 noun /djuːn/

dune

Meaning
A hill or ridge of sand formed by the wind, usually found in deserts or near beaches.
Example
The children played on the sand dune by the beach.
C1 noun /ˈdæmpər/

damper

Meaning
something that reduces or lessens the force, effect, or excitement
Example
The cancellation of the trip put a damper on their enthusiasm.
C1 noun /dɪˈpɑːzətɔːri/

depository

Meaning
a place where things are stored or deposited, especially financial assets
Example
The national depository safeguards all government bonds.
C1 noun dɪˌtɪə.ri.əˈreɪ.ʃən

deterioration

Meaning
The process of becoming progressively worse; decline in quality, condition, or strength.
Example
Poor maintenance leads to material deterioration.
C1 adjective /ˈdɑːsəl/ or /ˈdəʊsaɪl/

docile

Meaning
easily managed, taught, or controlled; submissive
Example
The docile puppy quickly learned new tricks.
C1 noun /ˌdɒmɪˈneɪʃən/

domination

Meaning
the exercise of control or influence over someone or something
Example
The empire sought domination over its neighbors.
C1 noun /ˈdɛməɡɒɡ/

demagogue

Meaning
A political leader who seeks support by appealing to popular desires and prejudices rather than by using rational argument.
Example
The crowd was swayed by the fiery speeches of the demagogue.
C1 adjective /dɪˈsɜːrnɪŋ/

discerning

Meaning
having good judgment or insight; able to distinguish well
Example
He is a discerning reader who notices subtle details.
C1 adjective /dɪˈfʌŋkt/

defunct

Meaning
No longer existing, operating, or functioning.
Example
The company became defunct after the financial crisis.
C1 adjective /daɪər/

Dire

Meaning
extremely serious; urgent; terrible
Example
The country is facing a dire economic crisis.
C1 verb /dɪˈmoʊt/

demote

Meaning
to reduce to a lower rank or position
Example
The manager decided to demote the employee for poor performance.
C1 verb /dɪˈraɪd/

deride

Meaning
to mock or ridicule someone or something
Example
The critics derided the new movie for its poor script.
C1 verb /dɪˈspɛl/

dispel

Meaning
to make a doubt, feeling, or belief disappear
Example
The teacher's explanation dispelled the students' confusion.
C1 verb /daɪˈleɪt/

dilate

Meaning
To make wider, larger, or more open.
Example
The doctor used drops to dilate the patient's pupils.
C1 noun /dɪˈfjuːʒən/

diffusion

Meaning
the spreading of something more widely or the movement of particles from high to low concentration
Example
The diffusion of information on social media is rapid.
C1 noun /ˌdiː.kɒmpəˈzɪʃən/

decomposition

Meaning
the process of decaying or breaking down into simpler parts
Example
The decomposition of leaves enriches the soil.
C1 noun /diːˈkrɪp.ʃən/

decryption

Meaning
The process of converting encrypted data back into its original form so it can be understood.
Example
Hackers attempted decryption of classified data.
C1 adjective /dɪsˈkɔːrdənt/

discordant

Meaning
disagreeing or clashing; harsh and jarring in sound
Example
The discordant notes of the band hurt our ears.
C1 verb /dɪˈsɛləˌreɪt/

decelerate

Meaning
to reduce speed; to slow down
Example
The car began to decelerate as it approached the traffic light.
C1 verb dɪˈsɜːn

discern

Meaning
To perceive or recognize something; to distinguish with difficulty by sight or with the other senses.
Example
He could barely discern the distant figure in the fog.
C1 adjective /dɪsˈrɛpjətəbl̩/

disreputable

Meaning
having a bad reputation; not considered respectable or trustworthy
Example
The journalist avoided staying in the disreputable part of town.
C1 verb /ˈdræm.ə.taɪz/

dramatize

Meaning
to present a story in a dramatic way, or to exaggerate something
Example
The novel was dramatized into a popular TV series.
C1 adjective /dɪˈmɒnstrəbl/

demonstrable

Meaning
clearly able to be shown or proven
Example
There was demonstrable evidence that he was innocent.
C1 adjective ˌdet.rɪˈmen.təl

detrimental

Meaning
Tending to cause harm; damaging or harmful.
Example
Pollution has detrimental effects on fertility.
C1 verb /ˌdiːˈbʌŋk/

debunk

Meaning
Expose the falseness or hollowness of (a myth, idea, or belief).
Example
Scientists debunked the myth that vaccines cause autism.
C1 noun /ˈdrʌdʒəri/

drudgery

Meaning
Hard, menial, or dull work.
Example
She wanted to escape the drudgery of her daily routine.
C1 verb /dɔːnt/

daunt

Meaning
to make someone feel intimidated, discouraged, or less confident
Example
The steep climb did not daunt the experienced hikers.
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 verb /diːm/

deem

Meaning
to regard or consider in a specified way
Example
The project was deemed a success by the board.
C1 noun /dɪsˈɒn.ər/

Dishonour

Meaning
a state of shame or disgrace; lack of honor or integrity; failure to fulfill obligations
Example
Breaking his promise brought dishonour to his name and family legacy.
C1 adjective /dɪˈsɪd.ju.əs/

deciduous

Meaning
Referring to trees that shed their leaves seasonally, typically in autumn.
Example
Oak and maple trees are deciduous, shedding leaves in autumn.
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 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 verb /deɪz/

daze

Meaning
to stun or confuse someone temporarily with a shock or surprise
Example
The bright lights dazed the runners as they entered the stadium.
C1 noun /ˈdrɪz.əl/

Drizzle

Meaning
light rain falling in very fine drops; a very light rainfall
Example
The gentle drizzle continued throughout the morning, making everything misty.
C1 noun /ˈdɒɡmə/

dogma

Meaning
A principle or set of principles laid down by an authority as incontrovertibly true.
Example
The religious leader strictly adhered to traditional dogma.
C1 adjective /ˈdek.stər.əs/

dexterous

Meaning
Showing or having skill, especially with the hands; mentally adroit and skillful.
Example
A dexterous programmer can write complex codes effortlessly.
C1 adjective /ˈdiːviəs/

devious

Meaning
Skillful at using underhanded tactics to achieve goals; not straightforward.
Example
He used a devious plan to gain control of the company.
C1 verb /dɪsˈpærɪdʒ/

disparage

Meaning
to criticize someone or something in a way that shows a lack of respect
Example
It is unfair to disparage people for their opinions.
C1 noun ˌdɪs.æmˌbɪɡ.juˈeɪ.ʃən

disambiguation

Meaning
The removal of ambiguity by making something clear and unambiguous.
Example
The AI system applies disambiguation to refine text understanding.
C1 verb /ˈdɛprɪˌkeɪt/

deprecate

Meaning
to express disapproval of something
Example
The teacher deprecated the use of slang in academic essays.
C1 noun /ˈdaʊn.pɔːr/

Downpour

Meaning
a heavy fall of rain; a sudden heavy rainfall
Example
The sudden downpour caught everyone off guard and soaked the outdoor event.
C1 adjective /ˈdeɪnti/

dainty

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

dismantle

Meaning
to take apart; to remove or destroy the parts of
Example
Workers will dismantle the old bridge next month.
C1 adjective /dɪsˈhɑːrtənd/

Disheartened

Meaning
discouraged; feeling dejected; losing hope or confidence
Example
She felt disheartened after failing the exam twice.
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 /ˈdɛljuːdʒ/

deluge

Meaning
A severe flood; an overwhelming quantity of something.
Example
The town was hit by a deluge of rain in just a few hours.
C1 noun /dɪˈten.ʃən/

Detention

Meaning
the action of detaining someone or being detained in official custody
Example
The student received detention for repeatedly disrupting the class.
C1 adjective /ˈdɔːr.mənt/

Dormant

Meaning
inactive; sleeping; temporarily suspended; not currently active
Example
The volcano has been dormant for over a century.
C1 adjective /ˈdwɪndlɪŋ/

dwindling

Meaning
Gradually reducing in number, size, or strength.
Example
The villagers relied on dwindling water supplies.
C1 noun /dɪˈprɛsənt/

depressant

Meaning
A drug that reduces functional or nervous activity in the body.
Example
Alcohol acts as a depressant on the central nervous system.
C1 adjective /ˌdaɪəˈbɒlɪkəl/

diabolical

Meaning
Wicked, cruel, or outrageously bad; resembling the devil.
Example
The dictator’s diabolical rule brought misery to the nation.
C1 adjective /ˈdɒdʒi/

Dodgy

Meaning
suspicious; questionable; unreliable; risky or dangerous
Example
That deal sounds dodgy to me.
C1 verb, noun /ˌdɪsɪˈluːʒən/

disillusion

Meaning
to cause someone to realize that something is not as good as they believed
Example
The scandal disillusioned many voters.
C1 noun ˌdɪm.ɪˈnjuː.ʃən

diminution

Meaning
A reduction in the size, extent, or importance of something; decrease.
Example
There has been a diminution in air pollution.