salinity
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C1 noun /səˈlɪn.ə.t̬i/

salinity

salinidad, concentración de sal
Meaning
The salt content of soil or water, typically measured as a concentration.
Example
The salinity of the ocean varies depending on depth and location.
La salinidad del océano varía dependiendo de la profundidad y la ubicación.
C1 adjective, verb /muːt/

moot

irrelevante / debatible
Meaning
Adjective: subject to debate or irrelevant. Verb: to suggest an idea for discussion.
Example
The issue of funding became a moot point after the project was canceled.
El tema de la financiación se convirtió en un punto irrelevante después de que el proyecto fuera cancelado.
C1 noun /ˌpiːdiˈætrɪks/

pediatrics

pediatría
Meaning
the branch of medicine dealing with the health and medical care of children
Example
She decided to specialize in pediatrics after medical school.
Decidió especializarse en pediatría después de la escuela de medicina.
C1 adjective /kənˈsɛntrɪk/

concentric

concentrico
Meaning
having a common center, as in circles or spheres
Example
The artist drew concentric circles on the canvas.
El artista dibujó círculos concéntricos en el lienzo.
C1 adjective /ˈsɜːrli/

surly

gruñón
Meaning
bad-tempered and unfriendly
Example
The waiter gave us a surly look when we asked for more water.
El camarero nos miró de forma gruñona cuando pedimos más agua.
C1 noun /ˌdɒmɪˈneɪʃən/

domination

dominación
Meaning
the exercise of control or influence over someone or something
Example
The empire sought domination over its neighbors.
El imperio buscaba dominación sobre sus vecinos.
C1 noun /rəˈpɪdəti/

rapidity

rapidez
Meaning
The quality of moving or happening quickly; swiftness or speed.
Example
The rapidity of technological change is astonishing.
La rapidez del cambio tecnológico es asombroso.
C1 adjective /ˈfliː.tɪŋ/

fleeting

efímero
Meaning
Lasting for a very short time; passing quickly.
Example
Happiness can be fleeting, so cherish every moment.
La felicidad puede ser efímera, así que aprecia cada momento.
C1 adjective /ɪnˈstrʌktɪv/

instructive

instructivo
Meaning
useful and informative; providing knowledge or instruction
Example
The lecture was highly instructive and engaging.
La conferencia fue muy instructiva y atractiva.
C1 noun /rɪˈbʌtəl/

rebuttal

refutación
Meaning
a statement or argument made to oppose or disprove another
Example
Her rebuttal was clear and convincing.
Su refutación fue clara y convincente.
C1 noun /ˈkwɒn.dər.i/

Quandary

dilema; incertidumbre
Meaning
a difficult situation where you cannot decide what to do; dilemma
Example
She was in a quandary about which job offer to accept.
Ella estaba en un dilema sobre qué oferta de trabajo aceptar.
C1 adjective /ˌʌnəˈkaʊntəbl/

unaccountable

inexplicable
Meaning
Not able to be explained or justified.
Example
She felt an unaccountable fear as she entered the dark room.
Ella sintió un miedo inexplicable al entrar en la habitación oscura.
C1 noun /ˈstæl.i.ən/

stallion

caballo macho para cría
Meaning
An adult male horse that is not castrated, often used for breeding.
Example
The farm owns a powerful stallion for breeding purposes.
La granja posee un caballo macho poderoso para fines de cría.
C1 noun ˌæp.əˈreɪ.təs

apparatus

aparato
Meaning
The technical equipment or machinery needed for a particular activity or purpose.
Example
The apparatus was designed to be eco-friendly.
El aparato fue diseñado para ser ecológico.
C1 verb /dɪsˈɑːrm/

disarm

desarmar
Meaning
to take weapons away from someone; to make someone feel less hostile
Example
The soldiers were ordered to disarm the rebels.
A los soldados se les ordenó desarmar a los rebeldes.
C1 adjective/noun nɪˈmɒn.ɪk

mnemonic

dispositivo mnemotécnico, técnica para recordar
Meaning
Assisting or intended to assist memory; a device or technique to aid memory.
Example
A mnemonic device helps students remember complex concepts.
Un dispositivo mnemotécnico ayuda a los estudiantes a recordar conceptos complejos.
C1 noun /ˈiːɡoʊɪst/

egoist

egoísta
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.
Ella lo evitaba porque él era un egoísta egocéntrico.
C1 noun (plural) /ˈhɪntərlændz/

hinterlands

zonas remotas
Meaning
Plural of hinterland; remote or less developed regions.
Example
Explorers traveled deep into the hinterlands of the country.
Los exploradores viajaron profundamente a las zonas remotas del país.
C1 noun /ˌmɛrɪˈtɒkrəsi/

meritocracy

meritocracia
Meaning
A system in which advancement is based on individual ability or achievement.
Example
In a true meritocracy, the most capable people rise to leadership positions.
En una verdadera meritocracia, las personas más capaces ascienden a posiciones de liderazgo.
C1 adjective /ɪnˈdʒʊəriəs/

injurious

perjudicial
Meaning
Causing or likely to cause harm or damage.
Example
Smoking is injurious to health.
Fumar es perjudicial para la salud.
C1 adjective /ˈplʌk.i/

plucky

valiente
Meaning
having or showing courage and determination
Example
The plucky child rescued the kitten from the tree.
El niño valiente rescató al gatito del árbol.
C1 adverb /ˈeɪ.mi.ə.bli/

Amiably

amistosamente, de manera amistosa
Meaning
in a friendly and pleasant manner
Example
They discussed the issue amiably without any arguments.
Ellos discutieron el tema amigablemente sin discusiones.
C1 noun /ˌdɪspəˈzɪʃən/

disposition

disposición
Meaning
A person's usual attitude or temperament; arrangement or tendency.
Example
She has a cheerful disposition despite the difficulties.
Ella tiene una disposición alegre a pesar de las dificultades.
C1 adjective /ɪkˈskruːʃieɪtɪŋ/

excruciating

excruciante
Meaning
causing extreme physical or mental pain
Example
She was in excruciating pain after the accident.
Ella estaba en dolor insoportable después del accidente.
C1 noun /ˈmæroʊ/

Marrow

médula ósea
Meaning
A soft fatty substance in the cavities of bones; the essence of something
Example
The bone marrow produces blood cells in the human body.
La médula ósea produce células sanguíneas en el cuerpo humano.
C1 noun /ˌdɪp.ləˈmæt.ɪk ˈmaɪl.stəʊn/

diplomatic milestone

hito diplomático
Meaning
A significant achievement or important event in diplomatic relations.
Example
Hosting the summit was a diplomatic milestone.
La organización de la cumbre fue un hito diplomático.
C1 adjective /ˌɪntərˈtwaɪnd/

intertwined

felicidad
Meaning
closely connected or twisted together
Example
Their lives became deeply intertwined after the accident.
Ella no pudo ocultar su felicidad cuando recibió el premio.
C1 noun /ɪˈnæməl/

enamel

esmalte
Meaning
a hard, glossy substance used as a protective or decorative coating; the hard outer layer of teeth
Example
The dentist explained that enamel protects the teeth from decay.
El dentista explicó que el esmalte protege los dientes de la caries.
C1 adjective /loʊθ/

loath

reacio
Meaning
reluctant or unwilling to do something
Example
She was loath to admit her mistake in front of everyone.
Ella estaba reacia a admitir su error frente a todos.
C1 verb /hoʊn/

hone

afilar, mejorar habilidades
Meaning
To sharpen a blade or to improve a skill through practice.
Example
She honed her presentation skills before the big meeting.
Ella perfeccionó sus habilidades de presentación antes de la gran reunión.
C1 verb /ˈkætəˌlaɪz/

catalyze

catalizar
Meaning
To cause or accelerate a reaction or change.
Example
The new law catalyzed reforms across the sector.
La nueva ley catalizó reformas en todo el sector.
C1 adjective /rɪˈɡrɛtfəl/

regretful

arrepentido
Meaning
feeling or showing sadness or disappointment about something that has happened or been done
Example
She gave him a regretful smile as she turned away.
Ella le dio una sonrisa arrepentida mientras se alejaba.
C1 noun /ˈstɪɡmə/

stigma

estigma
Meaning
a mark of shame or disgrace associated with a particular circumstance or quality
Example
There is still a stigma around mental health issues in many societies.
Todavía existe un estigma en torno a los problemas de salud mental en muchas sociedades.
C1 verb /flɪntʃ/

flinch

retroceder
Meaning
to suddenly move back or away due to fear or pain
Example
He didn’t flinch when the doctor gave him the injection.
Él no se echó atrás cuando el doctor le dio la inyección.
C1 noun /fɪˈziːk/

physique

físico
Meaning
the form, size, and development of a person's body
Example
He has an athletic physique due to years of training.
Él tiene una constitución atlética debido a años de entrenamiento.
C1 noun ˌkʌl.mɪˈneɪ.ʃən

culmination

culminación. El punto más alto o culminante de algo, especialmente alcanzado después de mucho tiempo.
Meaning
The highest or climactic point of something, especially as attained after a long time.
Example
The project reached its culmination after years of effort.
El proyecto alcanzó su culminación después de años de esfuerzo.
C1 noun, verb /ˈmæn.deɪt/

mandate

mandato
Meaning
an official order or command; to give someone authority to act in a certain way
Example
The government issued a mandate to reduce carbon emissions.
El gobierno emitió un mandato para reducir las emisiones de carbono.
C1 noun /ˈmeɪniə/

Mania

manía; entusiasmo extremo
Meaning
Mental illness marked by periods of great excitement; extreme enthusiasm
Example
She had a mania for collecting vintage postcards from around the world.
Ella tenía una manía por coleccionar tarjetas postales antiguas de todo el mundo.
C1 adjective /ˈbleɪmləs/

blameless

inocente
Meaning
innocent of wrongdoing; not deserving blame
Example
She remained calm and blameless throughout the investigation.
Ella permaneció tranquila e inocente durante toda la investigación.
C1 noun /ˈspiːʃiː/

specie

moneda
Meaning
money in the form of coins rather than notes or credit
Example
The transaction was made in specie.
La transacción se hizo en monedas.
C1 adjective /ɪnˈflɛksəbl/

inflexible

inflexible
Meaning
Not able to bend or change; unwilling to change ideas or behavior.
Example
His inflexible attitude made negotiations difficult.
Su actitud inflexible dificultó las negociaciones.
C1 verb /ɪnˈɡʌlf/

engulf

engullir
Meaning
to completely surround or cover something or someone
Example
The village was engulfed by floodwaters.
El pueblo fue engullido por las aguas del inundación.
C1 adjective /ɪˈmuː.və.bəl/

immovable

inmóvil
Meaning
Not able to be moved; fixed in position.
Example
Immovable barriers prevent change.
Las barreras inmóviles impiden el cambio.
C1 verb /ˈwɪð.ər/

wither

marchitar
Meaning
to dry up and die, typically used for plants
Example
The flowers will wither without enough water.
Las flores se marchitarán sin suficiente agua.
C1 verb /rɪˈbʌt/

rebut

refutar
Meaning
to argue against or prove wrong; to refute
Example
The lawyer rebutted the false accusations with strong evidence.
El abogado refutó las falsas acusaciones con pruebas contundentes.
C1 noun /ɔːr/

Oar

remo
Meaning
a long pole with a flat blade used to row a boat
Example
He dipped the oar into the water and pulled the boat forward.
Sumergió el remo en el agua y empujó el bote hacia adelante.
C1 verb /ɪnˈɡroʊs/

engross

absorto
Meaning
to absorb all the attention or interest of someone
Example
She was so engrossed in the book that she forgot the time.
Ella estaba tan absorbida en el libro que olvidó la hora.
C1 noun /ɪˈvæp.ər.ə.tɪv ˈkuː.lər/

Evaporative cooler

enfriador por evaporación
Meaning
a cooling device that uses water evaporation to reduce air temperature
Example
The evaporative cooler works best in dry climates.
El enfriador por evaporación funciona mejor en climas secos.
C1 adjective /ˈædʒ.aɪl/

agile

rápido y flexible
Meaning
able to move quickly and easily; quick and adaptable in thinking or action
Example
The startup team was agile in responding to market changes.
El equipo de la startup fue ágil al responder a los cambios del mercado.
C1 adjective /ˈɔː.də.bəl/

Audible

audible
Meaning
able to be heard; loud enough to hear
Example
The speaker's voice was barely audible from the back of the large hall.
La voz del orador apenas era audible desde el fondo del gran salón.
C1 verb /ˈfɜːr.tɪ.laɪz/

fertilize

fertilizar
Meaning
to make soil or land more fertile by adding substances
Example
Farmers fertilize the fields to increase crop yield.
Los agricultores fertilizan los campos para aumentar la cosecha.
C1 noun /ˌsɪmbɪˈəʊsɪs/

symbiosis

relación simbiótica
Meaning
A mutually beneficial relationship between different people or groups.
Example
The symbiosis between the two companies led to mutual growth.
La simbiosis entre las dos empresas llevó a un crecimiento mutuo.
C1 noun /kəˈnʌn.drəm/

conundrum

dilema complicado o acertijo
Meaning
A complex problem or puzzle without an easy solution
Example
The ethical conundrum puzzled the researchers.
El dilema ético desconcertó a los investigadores.
C1 adjective /ˈdjuːbiəs/

dubious

dudoso
Meaning
Hesitating or doubting; not to be relied upon.
Example
She gave him a dubious look after hearing his excuse.
Ella le dio una mirada dudosa después de escuchar su excusa.
C1 adjective /ˌbaɪˈlæt.ər.əl/

bilateral

bilateral
Meaning
An agreement or relationship between two parties that is mutual, two-sided, or reciprocal.
Example
The two countries signed a bilateral trade agreement.
Los dos países firmaron un acuerdo comercial bilateral.
C1 verb /daɪˈluːt/

dilute

diluir
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.
Debes diluir el jugo con agua antes de servirlo a los niños.
C1 noun ˌdaɪvɜːsɪfɪˈkeɪʃən

diversification

diversificación
Meaning
The practice of spreading investments across various assets or sectors to reduce risk.
Example
Diversification helps to reduce investment risk.
La diversificación ayuda a reducir el riesgo de inversión.
C1 noun /ˈtaɪ.ɡrəs/

Tigress

tigresa
Meaning
an adult female tiger
Example
The powerful tigress hunted silently through the jungle.
La poderosa tigresa cazó silenciosamente a través de la jungla.
C1 noun /brəˈzɪər/

Brassiere

sujetador
Meaning
a woman's undergarment designed to support the breasts
Example
She bought a comfortable brassiere for daily wear.
Ella compró un sujetador cómodo para usar a diario.
C1 verb /trænˈskraɪb/

transcribe

transcribir
Meaning
to make a written copy of spoken words or notes
Example
The secretary transcribed the meeting minutes.
La secretaria transcribió las actas de la reunión.
C1 adjective /ˈstɛriəˌtaɪpt/

stereotyped

estereotipado
Meaning
Conforming to a fixed or oversimplified idea of what someone or something is like.
Example
His stereotyped jokes failed to impress the audience.
Sus chistes estereotipados no lograron impresionar a la audiencia.
C1 noun /ˈpæntəmaɪm/

pantomime

pantomima
Meaning
A type of theatrical performance using gestures and movements without spoken words; in Britain, a musical comedy play for families performed at Christmas.
Example
The children enjoyed the Christmas pantomime at the local theater.
Los niños disfrutaron de la pantomima navideña en el teatro local.
C1 noun /ˈtʃɪz.əl/

Chisel

cincel
Meaning
a tool with a sharp flat edge used for cutting or shaping wood, stone, or metal
Example
The carpenter used a chisel to carve the wood.
El carpintero usó un cincel para tallar la madera.
C1 noun /kɔːr/

corps

rama del ejército, grupo
Meaning
a branch of the military or a group organized for a specific purpose
Example
He joined the army corps after graduation.
Se unió al cuerpo del ejército después de graduarse.
C1 verb /ˈpɪlɪdʒ/

pillage

saquear
Meaning
to rob or plunder a place, especially during war
Example
The invading army pillaged the village and took all valuables.
El ejército invasor saqueó la aldea y se llevó todas las cosas valiosas.
C1 noun /ˈhaɪdəweɪ/

hideaway

escondite
Meaning
A place used as a retreat or a place to hide.
Example
The cabin in the woods was their secret hideaway.
La cabaña en el bosque era su escondite secreto.
C1 noun /hɔːrd/

horde

multitud
Meaning
A large group or crowd, especially one that is disorderly or difficult to control.
Example
A horde of fans gathered outside the stadium.
Una multitud de fanáticos se reunió fuera del estadio.
C1 verb /ˌaʊtˈweɪ/

outweigh

ser más importante
Meaning
To be more important, valuable, or significant than something else.
Example
The benefits of the new policy outweigh the risks.
Los beneficios de la nueva política superan los riesgos.
C1 verb /kəˈluːd/

collude

conspirar
Meaning
To secretly cooperate or conspire with others, often for a deceitful purpose.
Example
The two companies colluded to fix prices in the market.
Las dos empresas conspiraron para fijar los precios en el mercado.
C1 noun /ˈtriːzən/

Treason

traición
Meaning
the crime of betraying one's country, especially by attempting to kill or overthrow the sovereign or government
Example
He was accused of treason against the state.
Él fue acusado de traición contra el estado.
C1 noun /ɡeɪt/

gait

modo de caminar
Meaning
A person's manner of walking.
Example
His slow gait showed that he was tired.
Su marcha lenta mostró que estaba cansado.
C1 adjective /ˈmɔːrn.fəl/

mournful

triste
Meaning
feeling, expressing, or causing sadness or grief
Example
The mournful song reminded her of lost loved ones.
La triste canción le recordó a sus seres queridos perdidos.
C1 verb /hjuːˈmɪlieɪt/

humiliate

humillar
Meaning
to make someone feel ashamed or foolish by injuring their dignity
Example
He was humiliated by his public failure.
Él fue humillado por su fracaso público.
C1 verb /ˈædʒ.ɪ.teɪt/

agitate

agitar, provocar
Meaning
to stir up feelings or disturb; to campaign for change
Example
The protesters agitated for better working conditions.
Los manifestantes agitaron por mejores condiciones laborales.
C1 noun/adjective /ˈstɜː.lɪŋ/

sterling

moneda británica / excelente
Meaning
British money, especially pounds; of excellent quality.
Example
She was praised for her sterling work on the project.
Fue elogiada por su excelente trabajo en el proyecto.
C1 noun /dɪˈspɜːrʒən/

dispersion

dispersión
Meaning
The action or process of distributing things or people over a wide area.
Example
The dispersion of seeds by the wind helps plants reproduce.
La dispersión de semillas por el viento ayuda a las plantas a reproducirse.
C1 noun /ˌdep.rɪˈveɪ.ʃən/

deprivation

privación, escasez, falta
Meaning
The damaging lack of material benefits considered to be basic necessities in a society.
Example
Sleep deprivation affects cognitive function.
La privación de sueño afecta la función cognitiva.
C1 adjective + noun ˈfeɪvərəbəl klaɪˈmætɪk kənˈdɪʃənz

favorable climatic conditions

condiciones climáticas favorables
Meaning
Weather conditions that are suitable and beneficial for growth or development
Example
Winter offers favorable climatic conditions for farming.
El invierno ofrece condiciones climáticas favorables para la agricultura.
C1 adjective/adverb /ɡəˈlɔːr/

galore

abundante
Meaning
In large amounts; abundant or plentiful.
Example
There were books galore in the old library.
Había libros abundantes en la vieja biblioteca.
C1 noun /ˈkɒnfɪdænt/

confidant

confidente
Meaning
A person with whom one shares a secret or private matter, trusting them not to repeat it.
Example
She found a true confidant in her childhood friend.
Ella encontró un verdadero confidente en su amigo de la infancia.
C1 adjective ˌʌn.pəˈtɜːbd

unperturbed

no preocupado o perturbado por algo; calmado y compuesto
Meaning
Not worried or disturbed by something; calm and composed.
Example
She remained unperturbed despite the challenges.
Ella permaneció tranquila a pesar de los desafíos.
C1 noun /ˈpɑːr.keɪ/

parquet

suelo de madera
Meaning
A floor made of wooden blocks arranged in a geometric pattern.
Example
The old mansion had a beautiful parquet floor.
La vieja mansión tenía un hermoso suelo de madera.
C1 noun /sɪˈtɑːr/

Sitar

sitar
Meaning
a traditional Indian stringed musical instrument with a long neck and resonating body
Example
The sitar creates beautiful ragas in Indian classical music.
El sitar crea hermosos ragas en la música clásica india.
C1 verb /ˌʌndərˈsɛl/

undersell

vender a un precio más bajo
Meaning
to sell something at a lower price than competitors or to downplay the value of something
Example
The shop undersold its rivals by offering huge discounts.
La tienda vendió a sus rivales a un precio más bajo ofreciendo grandes descuentos.
C1 adjective /ˌɪnəˈfɛnsɪv/

inoffensive

inoffensivo
Meaning
Not likely to offend or provoke; harmless.
Example
His inoffensive remarks kept the conversation friendly.
Sus comentarios inofensivos mantuvieron la conversación amigable.
C1 noun /ˈpraɪməsi/

primacy

primacía
Meaning
the state of being first in importance or authority
Example
The primacy of education cannot be denied.
La primacía de la educación no puede ser negada.
C1 noun /nɑːtʃ/

notch

muesca
Meaning
A small cut or groove on the edge or surface of something; a level or degree of achievement.
Example
He carved a notch on the stick to mark the days.
Hizo una muesca en el palo para marcar los días.
C1 noun /ˌænəlˈdʒiːzɪk/

analgesic

analgésico
Meaning
A drug or substance that relieves pain.
Example
She took an analgesic to ease her headache.
Ella tomó un analgésico para aliviar su dolor de cabeza.
C1 noun /ˈʌndərˌstʌdi/

understudy

doble de reparto
Meaning
An actor who learns another's role to act as a replacement if needed.
Example
The understudy performed when the lead actor fell ill.
El doble de reparto actuó cuando el actor principal se enfermó.
C1 verb/noun /stuːp/

stoop

felicidad
Meaning
To bend one's body forward and downward; also a small porch or staircase at the entrance of a house
Example
He had to stoop to pick up the coin.
No pudo esconder su felicidad cuando recibió el premio.
C1 noun /ˈdɪŋɡi/

dinghy

bote pequeño
Meaning
a small boat, often carried or towed by a larger vessel, used for short trips or as a lifeboat
Example
They rowed the dinghy back to the yacht.
Remaron el bote de remos de vuelta al yate.
C1 adjective /ˌʌnsəˈfɪstɪˌkeɪtɪd/

unsophisticated

no sofisticado
Meaning
Lacking worldly experience, refinement, or complexity.
Example
The villagers led an unsophisticated but happy life.
Los aldeanos llevaban una vida no sofisticada pero feliz.
C1 noun /ˌʌl.tɪˈmeɪ.təm/

Ultimatum

ultimátum
Meaning
a final demand or statement of terms, the rejection of which will result in retaliation
Example
The boss gave him an ultimatum: improve or be fired.
El jefe le dio un ultimátum: mejora o serás despedido.
C1 adjective /ˈmænɪfoʊld/

Manifold

múltiples
Meaning
many and of several different types; multiple; various
Example
The project has manifold benefits for the community.
El proyecto tiene múltiples beneficios para la comunidad.
C1 verb /ˈnʌrɪʃ/

nourish

nutrir
Meaning
To provide with food or other substances necessary for growth, health, and good condition
Example
Good books nourish the mind.
Los buenos libros nutren la mente.
C1 noun /ˌrek.ənˌsɪl.iˈeɪ.ʃən/

reconciliation

reconciliación
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.
El tratado de paz fue un paso importante hacia la reconciliación.
C1 noun /weɪ/

Whey

suero
Meaning
the watery part of milk that separates from the curds when making cheese
Example
Whey protein is popular among athletes and bodybuilders.
El proteína de suero es popular entre los atletas y culturistas.
C1 adjective ˈmær.ɪ.taɪm

Maritime

marítimo
Meaning
Connected with the sea, especially in relation to seafaring commercial or military activity.
Example
Maritime trade enhances the economy.
El comercio marítimo mejora la economía.
C1 noun ˈtær.ɪf

tariff

arancel o impuesto sobre importaciones y exportaciones
Meaning
A tax or duty to be paid on a particular class of imports or exports.
Example
The government imposed high tariffs on luxury goods.
El gobierno impuso altos aranceles sobre los productos de lujo.
C1 verb /ɪkˈspend/

expend

gastar
Meaning
to use up or consume; to spend energy or resources
Example
He expended all his energy on the project.
Él gastó toda su energía en el proyecto.
C1 adjective /ləˈbɔːr.i.əs/

laborious

laborioso
Meaning
requiring considerable effort and time; difficult and hard-working
Example
Writing the long report was a laborious task.
Escribir el informe largo fue una tarea laboriosa.
C1 noun /ˌluː.brɪˈkeɪ.ʃən/

lubrication

lubricación
Meaning
The action of applying a substance to reduce friction between surfaces in mutual contact.
Example
Lubrication of the eyes is essential for well-being.
La lubricación de los ojos es esencial para el bienestar.
C1 adjective /ˌæbəˈrɪdʒənəl/

aboriginal

aborigen
Meaning
Relating to the original inhabitants of a region.
Example
The museum has a large collection of aboriginal art.
El museo tiene una gran colección de arte aborigen.
C1 verb /əˈseɪl/

assail

atacar
Meaning
to attack violently, either physically or with words
Example
The politician was assailed with difficult questions.
El político fue asaltado con preguntas difíciles.
C1 noun /taɪˈkuːn/

tycoon

magnate
Meaning
a wealthy, powerful businessperson
Example
The real estate tycoon invested in several skyscrapers.
El magnate inmobiliario invirtió en varios rascacielos.
C1 adjective /kəmˈpleɪsənt/

complacent

complaciente
Meaning
showing self-satisfaction and a lack of concern about potential dangers or problems
Example
The team grew complacent after a few victories and stopped practicing hard.
El equipo se volvió complaciente después de unas victorias y dejó de practicar duro.
C1 noun /ˈɪm.pæs/

impasse

impasse
Meaning
A situation where no progress is possible.
Example
The negotiations reached an impasse, delaying the agreement.
Las negociaciones llegaron a un impasse, retrasando el acuerdo.
C1 adjective /ˈkɑːr.di.æk/

cardiac

cardíaco
Meaning
Relating to the heart.
Example
The patient was admitted with a cardiac condition.
El paciente fue admitido con una afección cardíaca.
C1 noun /ˈmævərɪk/

maverick

persona independiente
Meaning
An unorthodox or independent-minded person.
Example
The maverick scientist challenged established theories.
El científico independiente desafió las teorías establecidas.
C1 adjective /prəˈlɪf.ɪk/

prolific

prolífico
Meaning
Present in large numbers or quantities; plentiful; producing many works, results, or offspring.
Example
The author is prolific, having written over 30 books.
El autor es prolífico, ha escrito más de 30 libros.
C1 noun /ˌkɔr.diˈæl.ɪ.ti/

Cordiality

cordialidad; amabilidad
Meaning
sincere affection and kindness; warm and friendly behavior
Example
The host's cordiality made all the guests feel welcome and comfortable.
La cordialidad del anfitrión hizo que todos los invitados se sintieran bienvenidos y cómodos.
C1 noun /ˈnjuːɑːns/

nuance

matiz
Meaning
A subtle difference in shade of meaning, appearance, or sound.
Example
He noticed the subtle nuance in her expression.
Notó el sutil matiz en su expresión.
C1 noun əˈɡrɛriən səˈsaɪətiz

agrarian societies

sociedades agrarias
Meaning
Societies based on agriculture and farming as the primary economic activity.
Example
Agrarian societies emerged from a need for stable food sources.
Las sociedades agrarias surgieron por la necesidad de fuentes estables de alimentos.
C1 noun/verb /rɪˈproʊtʃ/

reproach

reproche / crítica
Meaning
An expression of disapproval or disappointment; to criticize someone for doing wrong.
Example
She reproached him for arriving late to the meeting.
Ella le reprochó por llegar tarde a la reunión.
C1 adverb /ˌðɛərˈtu/

Thereto

con eso;
Meaning
to that; in addition to that
Example
The house and the garden attached thereto were sold.
La casa y el jardín adjunto con eso fueron vendidos.
C1 noun /ˈwiː.vər/

Weaver

tejedor
Meaning
a person who makes cloth by interlacing threads on a loom
Example
The skilled weaver created intricate patterns on the silk fabric.
El hábil tejedor creó patrones intrincados en la tela de seda.
C1 verb /ɡrʌnt/

grunt

gruñir
Meaning
to make a low, rough sound, often when exerting effort or expressing annoyance
Example
He grunted as he lifted the heavy box.
Él gruñó mientras levantaba la caja pesada.
C1 verb /ˈpærəlaɪz/

paralyze

paralizar
Meaning
to cause someone or something to lose the ability to move or function normally
Example
The sudden shock seemed to paralyze him.
El choque repentino parecía paralizarlo.
C1 noun /ˈwɒrənt/

Warrant

orden judicial
Meaning
a legal document that gives police the authority to do something; justification or authority for an action
Example
The police obtained a search warrant before entering the building.
La policía obtuvo una orden de registro antes de entrar en el edificio.
C1 adjective /ˈdjuːtɪfəl/

Dutiful

cumplidor; respetuoso; obediente
Meaning
conscientiously fulfilling one's duty; obedient; respectful
Example
She is a dutiful daughter who always helps her parents.
Ella es una hija cumplidora que siempre ayuda a sus padres.
C1 verb /ʌnˈrævəl/

unravel

desentrañar
Meaning
To undo twisted or knitted threads; to solve or explain something complicated.
Example
The detective worked hard to unravel the mystery.
El detective trabajó arduamente para desentrañar el misterio.