dubious
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C1 adjective /ˈdjuːbiəs/

dubious

Meaning
Hesitating or doubting; not to be relied upon.
Example
She gave him a dubious look after hearing his excuse.
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 verb /dɪˈsɛm.ɪ.neɪt/

disseminate

Meaning
To spread or give out something, especially news, information, ideas, etc., to a lot of people.
Example
Social media helps to disseminate information quickly.
C1 adjective /ˌdɪfəˈrɛnʃəl/

differential

Meaning
Relating to or showing a difference; involving a distinction.
Example
There is a differential treatment between the two groups.
C1 noun ˌdɪs.ɪnˈfek.ʃən

disinfection

Meaning
The process of destroying harmful microorganisms to prevent infection.
Example
Kitchen appliances require frequent disinfection.
C1 verb /daɪˈluːt/

dilute

Meaning
To make a liquid thinner or weaker by adding water or another solvent.
Example
You should dilute the juice with water before serving it to children.
C1 noun dɪˈsʌɪsɪvnɪs

decisiveness

Meaning
The ability to make decisions quickly and effectively.
Example
His decisiveness during the crisis saved the company.
C1 adjective /ˈdɪs.ə.plɪ.ner.i/

Disciplinary

Meaning
relating to discipline; intended to correct behavior
Example
The company took disciplinary action against the employee.
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 /dɪsˈoʊn/

disown

Meaning
to refuse to acknowledge or accept responsibility for someone or something
Example
He decided to disown his reckless brother.
C1 noun /dɪˈluːʒən/

delusion

Meaning
A false belief or impression maintained despite being contradicted by reality.
Example
He lived under the delusion that he was invincible.
C1 noun /ˌdɪspəˈzɪʃən/

disposition

Meaning
A person's usual attitude or temperament; arrangement or tendency.
Example
She has a cheerful disposition despite the difficulties.
C1 noun /djuːˈɛt/

duet

Meaning
a musical performance by two singers or instrumentalists
Example
They sang a beautiful duet together on stage.
C1 adjective /dɪsˈɪntrəstɪd/

disinterested

Meaning
not influenced by personal interest; impartial or neutral
Example
The judge remained disinterested in the case.
C1 verb /dɪˈflɛkt/

deflect

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

discernment

Meaning
The ability to judge well or understand something correctly; keen insight.
Example
His discernment in business decisions made him successful.
C1 noun ˈdɪk.ʃən

diction

Meaning
The style of pronunciation and word choice in speaking or writing.
Example
A strong diction enhances communication skills.
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 /draɪ fɪʃ/

Dry fish

Meaning
fish that has been preserved by drying in the sun or by other dehydration methods
Example
Dry fish is a popular preserved food in many coastal regions.
C1 noun /ˈdɪs.ə.nəns/

dissonance

Meaning
Disagreement, lack of harmony, conflict between ideas or beliefs.
Example
The cultural dissonance created misunderstandings.
C1 verb /dɪsˈfɪɡjər/

disfigure

Meaning
to spoil or damage the appearance of something
Example
The fire disfigured the old building.
C1 adjective /ˈdɪn.dʒi/

Dingy

Meaning
dark and dirty; gloomy; dull in color
Example
The old building had dingy walls that needed painting.
C1 verb /dɪsˈkʌlər/

discolor

Meaning
to change color, especially in a way that spoils the original appearance
Example
The fabric began to discolor after being left in the sun.
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 /dɛlv/

delve

Meaning
To investigate deeply; to dig into a subject or area.
Example
The researcher delved into ancient manuscripts to find clues.
C1 noun /dɪn/

din

Meaning
a loud, unpleasant, and prolonged noise
Example
The din of traffic outside made it hard to concentrate.
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 verb /dɪˈmiːn/

demean

Meaning
to cause someone to lose dignity or respect
Example
The manager demeaned his employees with rude remarks.
C1 noun /ˈdɪsənˌtɛri/

dysentery

Meaning
An infection of the intestines resulting in severe diarrhea with blood and mucus.
Example
Many soldiers suffered from dysentery during the war.
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 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 verb /dɪˈtɛst/

detest

Meaning
To dislike intensely or hate.
Example
I detest waking up early on weekends.
C1 noun /ˈdaɪəˌlɛkt/

dialect

Meaning
A particular form of a language spoken in a specific region or by a specific group.
Example
He speaks a dialect of Bengali that is common in rural areas.
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 noun /ˌdɪsəˈluːʃən/

dissolution

Meaning
the act of formally ending or breaking apart something, such as an organization or marriage
Example
The dissolution of the company was announced yesterday.
C1 noun /ˌdɪspɛnˈseɪʃən/

dispensation

Meaning
An exemption from a rule or usual requirement; a system of order, government, or control.
Example
The school granted him a special dispensation to skip the exam due to illness.
C1 verb /dɪˈspɛl/

dispel

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

dissimilar

Meaning
Not alike; different.
Example
Though they are twins, their personalities are dissimilar.
C1 noun /ˌdɛtəˈneɪʃən/

detonation

Meaning
The act of exploding or causing something to explode.
Example
The sudden detonation shook the entire building.
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, verb /dɪsˈɑːnər/

dishonor

Meaning
a state of shame or loss of respect; to bring shame upon someone or something
Example
The soldier felt he had brought dishonor to his family.
C1 adjective /dɪˈvɔɪd/

devoid

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

droop

Meaning
to bend or hang downward; to become weak or tired
Example
The flowers began to droop in the heat.
C1 verb /dɪˈsɛləˌreɪt/

decelerate

Meaning
to reduce speed; to slow down
Example
The car began to decelerate as it approached the traffic light.
C1 adjective /ˈdaɪ.si/

dicey

Meaning
Risky or unpredictable; potentially dangerous.
Example
Investing in that company looks pretty dicey right now.
C1 adjective /ˈdeɪnti/

dainty

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

domesticate

Meaning
to tame an animal for use by humans; to adapt something for domestic use
Example
Humans domesticated dogs thousands of years ago.
C1 noun /dɪˌlɪb.əˈreɪ.ʃənz/

deliberations

Meaning
Careful consideration and discussion before making decisions.
Example
Deliberations on sustainability continued for hours.
C1 noun /dɪˈsiːt/

Deceit

Meaning
the action or practice of deceiving someone by concealing or misrepresenting the truth
Example
His deceit was discovered when the truth about his qualifications came to light.
C1 noun dɛkˈstɛr.ɪ.ti

dexterity

Meaning
Skill in performing tasks, especially with the hands; mental skill or adroitness.
Example
His dexterity in playing the piano amazed the audience.
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 adjective /dɪsˈpæʃənət/

dispassionate

Meaning
not influenced by strong emotion; impartial
Example
The judge remained dispassionate throughout the trial.
C1 verb /dɪˈpoʊz/

depose

Meaning
to remove someone from office or power, especially suddenly and forcefully
Example
The rebels managed to depose the dictator after years of unrest.
C1 adjective /ˈdaʊ.ər/

dour

Meaning
relentlessly severe, stern, or gloomy in manner or appearance
Example
His dour expression made the meeting uncomfortable.
C1 adjective /ˈdɑːsəl/ or /ˈdəʊsaɪl/

docile

Meaning
easily managed, taught, or controlled; submissive
Example
The docile puppy quickly learned new tricks.
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 noun ˌdep.əˈzɪʃ.ən

deposition

Meaning
The action of depositing something; the laying down of matter by a natural process.
Example
River deposition leads to the formation of new landmasses.
C1 noun /dɪsˈɪntrəst/

disinterest

Meaning
lack of interest or concern
Example
His disinterest in the project was obvious.
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 /dɪˈpreɪvd/

depraved

Meaning
morally corrupt or wicked
Example
The film depicts the life of a depraved criminal.
C1 noun /doʊ/

doe

Meaning
a female deer, especially an adult one
Example
The doe and her fawn were grazing in the meadow.
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 /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 adjective /dɪˈbɪl.ɪ.teɪ.tɪŋ/

debilitating

Meaning
Making someone or something weak and infirm.
Example
The disease had a debilitating effect on his health.
C1 adjective dɪsˈfʌŋkʃənl

dysfunctional

Meaning
Not operating normally or properly.
Example
The dysfunctional system led to numerous delays and errors.
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 noun dɪˈspær.ə.ti

disparity

Meaning
A great difference or inequality.
Example
Disparity between countries must be reduced.
C1 noun /ˌdiː.viˈeɪ.ʃən/

Deviation

Meaning
the action of departing from an established course; a departure from usual standards
Example
Any deviation from the established procedure must be reported immediately.
C1 verb /dɪˈspɛns/

dispense

Meaning
To distribute or provide something, especially in portions.
Example
The machine dispenses clean drinking water.
C1 adjective /ˌdɪktəˈtɔːriəl/

dictatorial

Meaning
Having or showing a tendency to tell people what to do in an autocratic way.
Example
His dictatorial style made him unpopular among colleagues.
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.
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 /dɪsˈsɜːrvɪs/

disservice

Meaning
A harmful action; something that does damage rather than help.
Example
Spreading false information is a disservice to the community.
C1 verb/adjective /dɪˈdʒɛnəreɪt/

degenerate

Meaning
To decline or deteriorate in quality, character, or condition; or someone with low moral standards.
Example
The once thriving empire began to degenerate into chaos.
C1 noun dəˌmɛstɪˈkeɪʃən

domestication

Meaning
The process of taming an animal and keeping it as a pet or for farm produce.
Example
Domestication of animals has been crucial for human survival.
C1 adjective /dɪˈreɪndʒd/

deranged

Meaning
mentally disturbed or insane; behaving irrationally
Example
The deranged man shouted nonsense in the street.
C1 noun /ˈduːmz.deɪ/

Doomsday

Meaning
the last day of the world's existence; a time of catastrophic destruction
Example
The preacher spoke about doomsday and the importance of preparing spiritually.
C1 noun ˌdɪdʒɪˈnɛəreɪʃən

degeneration

Meaning
The process of decline or deterioration in structure or function.
Example
The degeneration of brain cells leads to cognitive decline.
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 verb /dɪˈnəʊt/

denote

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

Dandruff

Meaning
small white or grey flakes of dead skin that form on the scalp and fall from the hair
Example
He used a special shampoo to treat his persistent dandruff problem.
C1 adjective /dɪˈɡreɪdɪd/

degraded

Meaning
Reduced in quality, dignity, or condition.
Example
The villagers were forced to live in degraded conditions.
C1 adjective /ˌdɪsɪnˈdʒɛnjʊəs/

disingenuous

Meaning
not candid or sincere; giving a false appearance of honesty or openness
Example
She gave a disingenuous excuse for missing the meeting.
C1 noun /ˈdek.ə.dəns/

decadence

Meaning
Moral or cultural decline characterized by excessive indulgence in pleasure or luxury.
Example
The novel describes the decadence of the wealthy elite.
C1 noun/verb /dɪsˈkwaɪət/

disquiet

Meaning
A feeling of worry or unease; to make someone feel anxious or uneasy.
Example
The strange silence filled the room with disquiet.
C1 noun /dɪˈkriː/

Decree

Meaning
an official order issued by a legal authority; a judicial decision or edict
Example
The king issued a decree that all citizens must pay additional taxes.
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 adjective /dæft/

daft

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

defiance

Meaning
Open resistance or bold disobedience.
Example
The protest was an act of defiance against injustice.
C1 noun /dɪˈvaɪzər/

divisor

Meaning
A number by which another number is divided.
Example
In the equation 12 ÷ 3, the number 3 is the divisor.
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 ˌdiːˌrɛɡ.jʊˈleɪ.ʃən

deregulation

Meaning
The removal or reduction of government regulations in an economic sector.
Example
Deregulation has increased competition in the telecommunications sector.
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 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 /draɪ ˈtʃɪl.i/

Dry Chilli

Meaning
dried chili peppers used as spice for adding heat to food
Example
The recipe calls for two dry chillies to make it spicy.
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 /ˈdesələt/

Desolate

Meaning
deserted; lonely; barren
Example
The abandoned village looked desolate and empty.
C1 verb /ˈdɛnɪˌɡreɪt/

denigrate

Meaning
to criticize unfairly; to belittle or disparage someone or something
Example
He was quick to denigrate the achievements of his colleagues.
C1 adjective /ˈdɪzməl/

Dismal

Meaning
gloomy; depressing; causing sadness or despair
Example
The weather was dismal with heavy rain and dark clouds.
C1 adjective /ˈdraʊ.zi/

Drowsy

Meaning
feeling sleepy and lethargic; half asleep; tired
Example
I felt drowsy after the heavy meal.
C1 noun /diːˌtɒksɪfɪˈkeɪʃən/

detoxification

Meaning
The process of removing toxic substances from a living organism.
Example
Detoxification helps to cleanse the body of harmful substances.
C1 adjective /ˈdæʃ.ɪŋ/

Dashing

Meaning
stylish and confident; lively and energetic; attractive and charming
Example
He looked dashing in his new suit.
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 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 noun /ˈdɛsɪˌbɛl/

decibel

Meaning
a unit used to measure the intensity of sound
Example
The noise level in the factory exceeded 90 decibels.
C1 noun /dɪˈskrep.ən.si/

discrepancy

Meaning
A lack of compatibility or similarity between two or more facts.
Example
The audit revealed a discrepancy between the reported earnings and actual income.
C1 noun daɪˈkɒtəmi

dichotomy

Meaning
A division or contrast between two things that are or are represented as being opposed or entirely different.
Example
The dichotomy between tradition and modernity is often debated.
C1 adjective /dɪˈʃɛvəld/

disheveled

Meaning
Untidy, messy, or in disorder, especially of hair or clothing.
Example
He arrived with disheveled hair and wrinkled clothes.
C1 noun /ˈdeɪ.li.ə/

Dahlia

Meaning
a garden plant with brightly colored flowers that bloom in summer and autumn
Example
She planted colorful dahlias in her garden last summer.
C1 adjective /ˈdjuːtɪfəl/

Dutiful

Meaning
conscientiously fulfilling one's duty; obedient; respectful
Example
She is a dutiful daughter who always helps her parents.
C1 verb /dɪˈfaɪl/

defile

Meaning
to pollute, corrupt, or make dirty
Example
The river was defiled by industrial waste.
C1 adjective /dɪˈrɒɡətɔːri/

derogatory

Meaning
Showing a critical or disrespectful attitude.
Example
The article contained derogatory comments about the politician.
C1 adjective draʊt rɪˈzɪs.tənt

drought-resistant

Meaning
Able to survive and grow despite limited water availability or drought conditions.
Example
Drought-resistant crops can survive in arid conditions.
C1 noun /ˈdeɪtəm/ or /ˈdætəm/

datum

Meaning
a single piece of information; a fact used as a basis for reasoning or calculation
Example
Each datum in the survey was carefully analyzed.
C1 noun /ˌdev.əˈtiː/

Devotee

Meaning
a person who is very interested in and enthusiastic about someone or something
Example
As a devotee of classical music, she attended every concert in the city.
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 verb /dɪˈkraɪ/

decry

Meaning
to publicly criticize or express strong disapproval of something
Example
Many activists decry the destruction of the rainforest.
C1 adjective /dɪˈfɛnsəbəl/

defensible

Meaning
Capable of being protected against attack or criticism; justifiable.
Example
Her decision was legally defensible.
C1 noun /ˈdiːvə/

diva

Meaning
a famous female singer; a woman who is admired or behaves like a star
Example
The pop diva performed her latest hit to a cheering crowd.
C1 noun /ˌdɛməˈlɪʃən/

demolition

Meaning
the act or process of destroying a building or structure
Example
The demolition of the old factory took several weeks.