reticent
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C1 adjective /ˈrɛtɪsənt/

reticent

Meaning
not revealing one's thoughts or feelings readily; reserved
Example
She was reticent about her personal life.
C1 verb /riːl/

reel

Meaning
to lose balance and stagger; to wind or spin something onto a reel
Example
He reeled backward after being punched.
C1 noun /ˈrez.ɪ.dənt ˈkəʊ.ɔː.dɪ.neɪ.tər/

resident coordinator

Meaning
A local administrator or official who coordinates activities in a specific region.
Example
The resident coordinator welcomed all representatives.
C1 noun /riˈæktənt/

reactant

Meaning
A substance that takes part in and undergoes change during a chemical reaction.
Example
Oxygen is a reactant in the process of combustion.
C1 verb /rɪˈkaʊnt/

recount

Meaning
to narrate or tell the details of an event or experience
Example
She recounted her adventures during the summer trip.
C1 adjective /ˈræmʃækəl/

ramshackle

Meaning
poorly built or maintained; in a state of disrepair
Example
They lived in a ramshackle old house on the edge of town.
C1 noun /ˌrɛtrɪˈbjuːʃən/

retribution

Meaning
punishment inflicted as vengeance for a wrong or crime
Example
The villagers demanded retribution for the crime committed.
C1 noun /ˈræmpɑːrt/

rampart

Meaning
a defensive wall of a castle or fort
Example
The soldiers stood on the rampart, watching the enemy approach.
C1 adjective /ˈrænsɪd/

rancid

Meaning
having a bad taste or smell due to being old or spoiled (especially fats or oils)
Example
The butter had gone rancid after being left out too long.
C1 verb /rɪˈtɔːrt/

retort

Meaning
To reply quickly or sharply, often in a witty or angry manner.
Example
He quickly retorted that he was not to blame.
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.
C1 verb /ˌriːˈvaɪ.t̬əl.aɪz/

revitalize

Meaning
To restore energy and effectiveness to something.
Example
The new policies aim to revitalize the economy.
C1 adjective /rɪˈpen.tənt/

Repentant

Meaning
feeling or expressing sincere regret and remorse; sorry for one's actions
Example
The repentant thief returned the stolen money.
C1 verb /rɪˈpjuː.di.eɪt/

repudiate

Meaning
to refuse to accept, recognize, or support something
Example
He repudiated the claim that he was involved in the scandal.
C1 noun rɪˌdʒɛnəˈreɪʃən

regeneration

Meaning
Renewal, growth and development of cells, tissues or energy
Example
Proper rest allows muscle regeneration after exercise.
C1 adjective /ˌrɛprɪzɛnˈteɪʃənl̩/

representational

Meaning
Relating to or depicting something in a realistic or symbolic way.
Example
The artist preferred a representational style of painting.
C1 noun /rɪˌdʒuːvəˈneɪʃən/

rejuvenation

Meaning
The process of restoring something to a former better state, especially referring to renewing soil fertility or revitalizing agricultural land through various restoration practices.
Example
Rejuvenation of soil is necessary for sustainable agriculture.
C1 noun /ˌrev.əˈluː.ʃən.ər.i ˈbreɪk.θruː/

revolutionary breakthrough

Meaning
A sudden, dramatic, and important discovery or development that changes everything.
Example
Robotic surgery is a revolutionary breakthrough in healthcare.
C1 verb/noun /ˈrɛlɪʃ/

relish

Meaning
to greatly enjoy; also a condiment or sauce
Example
She relished the opportunity to travel abroad.
C1 verb /ˈræn.də.maɪz/

randomize

Meaning
To make something happen in a random order or manner.
Example
The software can randomize the order of questions.
C1 verb /rɪˈtælieɪt/

retaliate

Meaning
to make an attack in return for a similar attack
Example
The army retaliated after the enemy attack.
C1 noun ˈrɔɪəl ˈbɛŋɡəl ˈtaɪɡər

Royal Bengal Tiger

Meaning
A subspecies of tiger found primarily in India and Bangladesh, known for its distinctive orange coat with black stripes.
Example
The Royal Bengal Tiger is an iconic species of the Sundarbans.
C1 adjective /rɪˈvenʒ.fəl/

Revengeful

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

Rowdy

Meaning
disorderly; unruly; noisy and disruptive
Example
The rowdy children were making too much noise.
C1 noun /ˈriːkɔːrs/

recourse

Meaning
a source of help or protection in a difficult situation
Example
The students had no recourse but to appeal to the principal.
C1 noun /ˈrep.lɪ.kə/

Replica

Meaning
an exact copy or model of something, especially one on a smaller scale
Example
The museum displayed a perfect replica of the ancient statue.
C1 noun/verb /ˈræfəl/

raffle

Meaning
A means of raising money by selling numbered tickets, one or more of which are drawn at random for a prize; to sell something in such a lottery.
Example
The charity decided to raffle a bicycle to raise funds.
C1 verb /rɪˈbʌf/

rebuff

Meaning
to reject or refuse in a sharp or abrupt way
Example
She rebuffed his invitation to dinner.
C1 noun ˈrəʊvə

rover

Meaning
A vehicle for driving over rough terrain, especially one driven by remote control over extraterrestrial terrain.
Example
The rover landed on Mars to begin its exploration.
C1 noun /ˈrɒstrəm/

rostrum

Meaning
A raised platform for speakers, performers, or leaders.
Example
The politician delivered a speech from the rostrum.
C1 noun /ˌrek.ənˌsɪl.iˈeɪ.ʃən/

reconciliation

Meaning
The restoration of friendly relations; the action of making one view or belief compatible with another.
Example
The peace treaty was a major step toward reconciliation.
C1 noun /rɪˈsaɪtər/

reciter

Meaning
a person who recites or repeats something aloud from memory, especially poetry, prayers, or formal texts
Example
The reciter delivered the poem with clarity and emotion.
C1 verb /ˌriːɪnˈsteɪt/

reinstate

Meaning
To restore someone or something to their former position or condition.
Example
The company decided to reinstate the suspended employee.
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 noun /ˈrʌbəl/

rubble

Meaning
Broken stone, bricks, or debris from a collapsed building or structure.
Example
The rescue team searched through the rubble after the earthquake.
C1 verb /rɪˈkuːpəreɪt/

recuperate

Meaning
to recover from illness or regain strength
Example
She went to the countryside to recuperate after surgery.
C1 adjective /rɪˈvɜː.sə.bəl/

Reversible

Meaning
able to be turned the other way around; able to be undone or changed back
Example
This jacket is reversible and can be worn on both sides.
C1 noun, verb /raʊt/

rout

Meaning
A decisive defeat; to defeat completely.
Example
The army routed the enemy forces in the battle.
C1 adjective /ˈraɪtfəl/

rightful

Meaning
having a legitimate or just claim; proper or lawful
Example
She is the rightful owner of the property.
C1 adjective /ˈrɛtroʊˌɡreɪd/

retrograde

Meaning
moving backward or returning to a worse condition
Example
The policy was seen as a retrograde step for human rights.
C1 verb /ˌriː.ɪˈstæblɪʃ/

reestablish

Meaning
to set up or restore something again after it has been disrupted
Example
The government worked hard to reestablish peace in the region.
C1 adjective /rɪˈbel.jəs/

Rebellious

Meaning
defying authority; resisting control; disobedient;
Example
The rebellious teenager refused to follow his parents' rules.
C1 noun /ræmˈbuːtən/

Rambutan

Meaning
a tropical fruit with red spiky skin and white translucent sweet flesh similar to litchi
Example
The rambutan looks scary with its hairy skin but tastes very sweet inside.
C1 adjective /ˌrɛtroʊˈæktɪv/

retroactive

Meaning
applying to a period before it was enacted or established
Example
The new law was made retroactive to cover past cases.
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 noun /rɪˈpraɪ.zəl/

Reprisal

Meaning
an act of retaliation; revenge taken for an injury or wrong
Example
The attack was carried out as a reprisal for the earlier bombing.
C1 noun ˈrez.ɪ.djuːz

residues

Meaning
A small amount of something that remains after the main part has gone or been taken or used.
Example
The burning process leaves no harmful residues.
C1 noun /ˈriːpər/

reaper

Meaning
a person or machine that cuts and gathers crops
Example
The reaper moved slowly through the golden fields.
C1 noun ˌriːˌvaɪ.təl.aɪˈzeɪ.ʃən

revitalization

Meaning
The action of giving new life and vitality to something.
Example
Proper rest and nutrition lead to revitalization of the body.
C1 verb /rɒmp/

romp

Meaning
to play or move in a lively, carefree, and energetic way
Example
The children romped happily in the garden.
C1 verb /riːˈpeɪ.tri.eɪt/

repatriate

Meaning
To return someone to their own country, often after war or imprisonment.
Example
The government worked to repatriate the refugees safely.
C1 noun /rɪˌtæl.iˈeɪ.ʃən/

Retaliation

Meaning
the action of returning a military attack; counterattack; revenge for an injury or wrong
Example
The country threatened retaliation against any act of aggression.
C1 adjective ˈriːdʒən spəˈsɪfɪk

region-specific

Meaning
Relating to or characteristic of a particular region or area.
Example
Climate change impacts are region-specific.
C1 adjective /rɪˈmoʊtɪd/

remoted

Meaning
placed at a distance; made remote
Example
The system was remoted to a secure location.
C1 adjective /rɪˈsɔːrs ɪˈfɪʃ.ənt/

resource-efficient

Meaning
Using resources in a way that minimizes waste and maximizes productivity.
Example
Resource-efficient farming conserves water and energy.
C1 noun /ˈrɛspɪt/

respite

Meaning
A short period of rest or relief from something difficult or unpleasant.
Example
The weekend provided a welcome respite from work.
C1 noun ˌrɛk.əˈlɛk.ʃən

Recollection

Meaning
Remembering past events or information
Example
His recollection of childhood memories was vivid.
C1 adjective /rɪˈdʒɛn.ə.rə.tɪv/

regenerative

Meaning
Able to restore or renew damaged environments, soil, or resources.
Example
Regenerative farming improves soil health and biodiversity.
C1 adjective /rɪˈpliːt/

replete

Meaning
Filled or well-supplied with something; abundantly full.
Example
The book is replete with fascinating historical details.
C1 adjective /rɪˈtaɪərɪŋ/

retiring

Meaning
Shy and reserved; avoiding social contact.
Example
She is a quiet, retiring woman who avoids attention.
C1 noun /rɪˈpen.təns/

Repentance

Meaning
the action of repenting; sincere regret or remorse
Example
His genuine repentance moved everyone in the courtroom.
C1 noun /rɪˈpjuːt/

repute

Meaning
the opinion generally held of someone or something; reputation
Example
He is a scholar of great repute in his field.
C1 noun/verb /rɪˈproʊtʃ/

reproach

Meaning
An expression of disapproval or disappointment; to criticize someone for doing wrong.
Example
She reproached him for arriving late to the meeting.
C1 verb /ˈræn.sæk/

ransack

Meaning
to search a place roughly and steal or damage things
Example
Burglars ransacked the house while the family was away.
C1 verb /rɪˈprɛs/

repress

Meaning
To restrain, suppress, or keep under control, especially emotions or desires.
Example
He tried to repress his anger during the meeting.
C1 noun /rɪˈspɒnsɪvnəs/

responsiveness

Meaning
The quality of reacting quickly and positively
Example
The manager appreciated her responsiveness to customer feedback.
C1 adjective /ˈræb.ɪd/

rabid

Meaning
Having extreme or fanatical support for something; relating to or suffering from rabies.
Example
He was a rabid fan of the football team.
C1 noun /rɪˌmjuː.nəˈreɪ.ʃən/

Remuneration

Meaning
money paid for work or services; compensation or reward
Example
The job offers excellent remuneration and benefits.
C1 adjective /rɪˈtɜː.nə.bəl/

Returnable

Meaning
able to be returned or given back
Example
The bottle is returnable for a deposit refund.
C1 verb /ˌriːɪmˈbɜːrs/

reimburse

Meaning
to pay back money to someone who has spent it or lost it
Example
The company reimbursed him for travel expenses.
C1 noun /rɪft/

rift

Meaning
a serious break in a relationship; a split or crack
Example
A rift developed between the two friends after the argument.
C1 noun /rɪˈtriː.vəl/

retrieval

Meaning
The process of getting something back, especially from storage or memory.
Example
The brain's retrieval system helps recall past experiences.
C1 noun /ræˈpɔːr/

rapport

Meaning
A close and harmonious relationship in which the people or groups concerned understand each other's feelings or ideas.
Example
The teacher built a strong rapport with her students.
C1 adverb /ˈrɪdʒɪdli/

Rigidly

Meaning
in a strict, inflexible manner; without compromise
Example
The rules are rigidly enforced in this institution.
C1 adjective rɪˈsɛʃ.ən.er.i

recessionary

Meaning
Relating to or characterized by economic recession.
Example
Governments introduce policies to counter recessionary effects.
C1 noun /ˈrɪɡər/

rigor

Meaning
strictness, severity, or demanding conditions
Example
The training was carried out with great rigor.
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 verb /ˌrekəˈlekt/

recollect

Meaning
to remember something; to recall from memory
Example
I can't recollect where I put my keys.
C1 noun ˈremnənts

remnants

Meaning
A small remaining quantity of something; a surviving trace.
Example
The remnants of the wall are still visible.
C1 noun /rɪˈdʒɔɪsɪŋ/

rejoicing

Meaning
The action of showing great joy or happiness
Example
There was much rejoicing after the victory.
C1 adjective /ˈrʌs.tɪk/

Rustic

Meaning
simple and unsophisticated; relating to rural areas
Example
The rustic cottage had wooden beams and a thatched roof.
C1 verb ˈrɛk.tɪ.faɪ

rectify

Meaning
To correct mistakes or make something right.
Example
The company took steps to rectify its financial mistakes.
C1 noun /ˈrɛvərəns/

reverence

Meaning
deep respect for someone or something
Example
The students showed reverence to their teacher.
C1 verb /ˈrævɪdʒ/

ravage

Meaning
to cause severe and extensive damage or destruction
Example
The hurricane ravaged the coastal villages.
C1 verb /rɪɡ/

rig

Meaning
to manipulate or control something dishonestly; to set up equipment
Example
The election was rigged by corrupt officials.
C1 noun /ˈrɑːstər/

roster

Meaning
A list or plan showing people’s duties or times when they are scheduled.
Example
The manager updated the staff roster for next week.
C1 adjective /ˈriː.fleks/

Reflex

Meaning
an action performed without conscious thought; relating to reflection
Example
The doctor tested her reflex response by tapping her knee.
C1 adjective /ˈruːfəl/

rueful

Meaning
Expressing sorrow, regret, or pity.
Example
He gave a rueful smile after losing the match.
C1 adjective /ˌruː.dɪˈmen.tər.i/

Rudimentary

Meaning
basic; elementary; undeveloped; in the earliest stage of development
Example
She has only rudimentary knowledge of French.
C1 noun /rɪˈbʌtəl/

rebuttal

Meaning
a statement or argument made to oppose or disprove another
Example
Her rebuttal was clear and convincing.
C1 noun /ruːz/

Ruse

Meaning
an action intended to deceive someone; a trick or stratagem
Example
The thief used a clever ruse to distract the guard.
C1 adjective /rɪˈzɪdjuəl/

residual

Meaning
Remaining after the greater part has gone.
Example
The patient experienced residual pain after the surgery.
C1 verb /ˈræʃənaɪz/

rationlize

Meaning
to justify or explain something with logical reasons, even if not appropriate or true
Example
He tried to rationlize his mistake by blaming the system.
C1 noun /ˈrɒndɪvuː/

rendezvous

Meaning
a meeting or appointment at an agreed time and place
Example
They arranged a secret rendezvous at the café.
C1 noun /ˈrəʊ.bɒt əˈsɪs.tɪd prəˈsiː.dʒərz/

robot-assisted procedures

Meaning
Medical operations performed with the help of robotic systems to enhance precision and control.
Example
Robot-assisted procedures reduce human error.
C1 adjective /rɪˈtɔːrɪkəl/

rhetorical

Meaning
relating to the art of effective or persuasive speaking or writing; often a question asked to make a point rather than get an answer
Example
He asked a rhetorical question during the debate.
C1 adjective /raɪf/

rife

Meaning
widespread or common, often in a negative sense
Example
Corruption was rife in the old government system.
C1 adjective /rɪˈsɛptɪv/

receptive

Meaning
Willing to listen to or accept new ideas, suggestions, or experiences.
Example
She was receptive to feedback from her colleagues.
C1 noun /riːk/

Reek

Meaning
to have a very unpleasant smell; to give a strong impression of something unpleasant or undesirable
Example
The garbage can reeks of rotten food.
C1 noun rɪˈfaɪnmənt

refinement

Meaning
The process of removing impurities or unwanted elements from a substance.
Example
His manners showed a refinement that made him stand out in any crowd.
C1 verb rɪˈlɪŋ.kwɪʃ

relinquish

Meaning
To give up any authority, responsibility, or property.
Example
He decided to relinquish his position as CEO.
C1 verb /rɪˈnaʊns/

renounce

Meaning
to formally declare rejection of something, such as a claim, belief, or way of life
Example
She renounced her citizenship to move abroad permanently.
C1 adjective /ˈreɪdiənt/

radiant

Meaning
Shining brightly; expressing great happiness.
Example
She looked radiant in her wedding dress.
C1 adjective /ˈrɪvɪtɪŋ/

riveting

Meaning
extremely interesting; holding the complete attention
Example
The movie was so riveting that nobody looked away.
C1 verb /rɪˈɡrɛs/

regress

Meaning
To return to a former or less developed state.
Example
Without proper guidance, the child's progress began to regress.
C1 noun /rɪˈdʒɪdəti/

Rigidity

Meaning
inability to bend or be forced out of shape; unwillingness to change or compromise
Example
The rigidity of the old system prevented any innovation.
C1 noun /ˈræftər/

rafter

Meaning
One of the sloping beams that supports a roof.
Example
The old barn’s rafters were exposed.
C1 verb /rɪˈsɪprəˌkeɪt/

reciprocate

Meaning
To respond to an action or gesture by making a corresponding one.
Example
She smiled at him, and he reciprocated with a warm hug.
C1 noun/verb /rɪˈpriːz/

reprise

Meaning
A repetition or return to an earlier theme, role, or action.
Example
The actor reprised his role in the sequel.
C1 verb /rɪˈdʒɛnəreɪt/

regenerate

Meaning
to grow or produce again; to renew or restore
Example
The lizard can regenerate its lost tail.
C1 adjective /ˌrɛprɪˈhɛnsəbl̩/

reprehensible

Meaning
Deserving strong criticism or blame.
Example
His dishonest actions were truly reprehensible.
C1 adjective /ˌrɛmɪˈnɪsənt/

reminiscent

Meaning
Tending to remind one of something; suggestive of something in the past.
Example
The smell of rain is reminiscent of my childhood in the village.
C1 adjective /rɪˈmiːdiəl/

Remedial

Meaning
intended as a remedy; corrective; providing a cure;
Example
The students need remedial classes to improve their math skills.
C1 verb /raʊz/

rouse

Meaning
To awaken from sleep or to stir into action.
Example
The loud alarm roused him from his deep sleep.
C1 verb /ˈrʌm.ɪdʒ/

rummage

Meaning
to search through something in a disorderly way
Example
He rummaged through the drawer for his keys.
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 adjective /ˈroʊ.ɡɪʃ/

Roguish

Meaning
mischievous; playfully dishonest
Example
His roguish smile suggested he was up to some mischief.
C1 verb /ˌriː.kənˈviːn/

reconvene

Meaning
to gather or assemble again, especially for a meeting
Example
The committee will reconvene after lunch.
C1 noun /rɪˈzʌmp.ʃən/

Resumption

Meaning
the action of beginning something again after a pause or interruption
Example
The resumption of classes will be announced next week.
C1 verb /ˌriːɪnˈtɪɡreɪt/

reintegrate

Meaning
To bring someone or something back into a group or society after being separated.
Example
The program helps prisoners reintegrate into society.
C1 noun /ˈroʊdənt/

rodent

Meaning
a small mammal such as a mouse, rat, or squirrel, characterized by constantly growing incisors
Example
The farmer set traps to catch the rodents in his barn.