unpropitious
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C2 adjective /ˌʌnprəˈpɪʃəs/

unpropitious

desfavorable
Meaning
Not giving or indicating a good chance of success; unfavorable.
Example
The team began their journey under unpropitious weather conditions.
El equipo comenzó su viaje bajo condiciones meteorológicas desfavorables.
C2 verb /ʌnˈfɛtər/

unfetter

desatar
Meaning
to release from restraint or restriction; to free
Example
The new law will unfetter small businesses from excessive regulations.
La nueva ley liberará a las pequeñas empresas de regulaciones excesivas.
C1 verb /ʌnˈroʊl/

unroll

desenrollar
Meaning
to open something that is rolled up; to spread out gradually
Example
She unrolled the map on the table to find the route.
Ella desenrolló el mapa sobre la mesa para encontrar la ruta.
B2 adjective /ʌnˈiːvən/

Uneven

irregular; áspero
Meaning
not level or smooth; not regular or consistent
Example
The road was uneven and full of potholes.
La carretera estaba irregular y llena de baches.
B1 noun /ˈjuːnjən/

Union

unión
Meaning
the action of joining or combining; a political unit formed from separate states
Example
The union of the two companies created a powerful corporation.
La unión de las dos empresas creó una poderosa corporación.
C2 verb /ˈʌndərˌmæn/

underman

quedarse sin personal
Meaning
to supply with fewer workers or personnel than needed
Example
The hospital was undermanned during the flu outbreak.
El hospital estuvo con poco personal durante el brote de gripe.
B2 adjective /ˈʌpˌraɪt/

Upright

honesto y moralmente correcto; vertical o erecto en posición
Meaning
honest and morally correct; vertical or erect in position
Example
She is known for being an upright and honest businesswoman.
Ella es conocida por ser una empresaria honesta y recta.
B1 noun /ˌʌnɪmˈplɔɪmənt/

Unemployment

desempleo
Meaning
the state of being unemployed; lack of paid work
Example
The unemployment rate has increased significantly this year.
La tasa de desempleo ha aumentado significativamente este año.
B2 adjective /ʌnˈlɔːfl/

Unlawful

ilegal; ilícito
Meaning
not authorized by law; illegal
Example
The court declared the search unlawful.
El tribunal declaró que la búsqueda era ilegal.
B2 adjective /ʌnˈɑːrmd/

unarmed

desarmado
Meaning
Not equipped with or carrying weapons
Example
The police found the suspect unarmed during the search.
La policía encontró al sospechoso desarmado durante la búsqueda.
B1 adjective /ˌʌnɪmˈpɔːrtənt/

unimportant

sin importancia
Meaning
not having much value, significance, or influence
Example
The detail seemed unimportant compared to the main issue.
El detalle parecía sin importancia en comparación con el problema principal.
C2 verb /ʌnˈɑːrm/

unarm

desarmar
Meaning
to remove weapons from someone or to deprive of means of attack or defense
Example
The soldiers were ordered to unarm the prisoners.
Se ordenó a los soldados desarmar a los prisioneros.
B2 verb ˈjuːnɪfaɪ

unify

unificar
Meaning
To make or become united, uniform, or whole; to bring together into a single unit.
Example
Adolescents unify with peers for social acceptance.
Los adolescentes se unifican con sus compañeros para la aceptación social.
C2 verb /ʌnˈjoʊk/

unyoke

desenganchar
Meaning
To release from a yoke or to free from restraint or obligation.
Example
The farmer unyoked the oxen after a long day of work.
El agricultor desenganchó los bueyes después de un largo día de trabajo.
C2 verb /ʌnˈfrɒk/

unfrock

despojar a un sacerdote de su rango
Meaning
To remove a priest from his position or deprive someone of a rank.
Example
The corrupt priest was unfrocked after the investigation.
El sacerdote corrupto fue despojado de su rango después de la investigación.
C2 adjective /ʌnəˈpiːzd/

unappeased

insatisfecho
Meaning
Not satisfied or calmed; still feeling discontent or anger
Example
Despite the apology, she remained unappeased.
A pesar de la disculpa, ella permaneció insatisfecha.
C2 verb /ʌpˈbreɪd/

upbraid

reprender
Meaning
To scold or criticize someone harshly.
Example
The teacher upbraided the student for being late again.
El maestro reprendió al estudiante por llegar tarde otra vez.
A2 adjective /ʌnˈhel.θi/

Unhealthy

insalubre; no saludable
Meaning
harmful to health; not in good health; detrimental to well-being
Example
Eating too much fast food is unhealthy for your body.
Comer demasiada comida rápida es insalubre para tu cuerpo.
B2 adverb /ʌnˈfɛərli/

unfairly

injustamente
Meaning
In a manner that is not just, reasonable, or impartial
Example
He was treated unfairly by the committee.
Él fue tratado injustamente por el comité.
C2 adjective /ʌnˈfeɪnd/

unfeigned

genuino
Meaning
genuine; not pretended or insincere
Example
She expressed unfeigned joy at her friend's success.
Ella expresó una alegría genuina por el éxito de su amiga.
B2 noun /ˌʌnəˌveɪləˈbɪləti/

unavailability

indisponibilidad
Meaning
The state of being not available or not accessible.
Example
The unavailability of the manager caused a delay in the project.
La indisponibilidad del gerente causó un retraso en el proyecto.
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 adjective /ʌnˈsəʊʃəl/

unsocial

antisocial
Meaning
not enjoying the company of others; avoiding social interaction; contrary to social norms
Example
He prefers unsocial hours so he can work alone without interruptions.
Prefiere horarios antisociales para trabajar solo.
C1 adjective /ˌʌndərɪkˈspoʊzd/

underexposed

poco expuesto, descuidado
Meaning
insufficiently exposed to light (in photography) or not given enough attention
Example
The photo was underexposed and looked too dark.
La foto estaba poco expuesta y se veía demasiado oscura.
C2 adjective ˌʌn.əˈseɪ.lə.bəl

unassailable

inexpugnable
Meaning
Unable to be attacked, questioned, or defeated.
Example
An unassailable position ensures dominance.
Una posición inexpugnable asegura la dominancia.
B1 adjective /ʌnˈkaɪnd/

Unkind

cruel; no amable
Meaning
cruel; not nice or caring toward others
Example
It was unkind of him to make fun of her appearance.
Fue cruel de su parte hacer burla de su apariencia.
B2 adverb juːˈnæn.ɪ.məs.li

unanimously

unánimemente
Meaning
With the agreement of all people involved; without opposition.
Example
The proposal was unanimously accepted.
La propuesta fue aceptada unánimemente.
C1 verb /ʌnˈsɛtl/

unsettle

desconcertar
Meaning
To disturb or make someone feel anxious or uneasy.
Example
The sudden news unsettled the entire community.
La noticia repentina desconcertó a toda la comunidad.
C1 adjective /ʌnˈkleɪmd/

Unclaimed

no reclamado; no solicitado; abandonado o sin dueño
Meaning
not claimed by anyone; not demanded or requested; abandoned or ownerless
Example
The unclaimed luggage was stored in the airport's lost property department.
El equipaje no reclamado fue almacenado en el departamento de objetos perdidos del aeropuerto.
C2 adjective /ˈɜːrsaɪn/

ursine

osoide
Meaning
Relating to or resembling a bear.
Example
The man’s ursine strength amazed everyone.
La fuerza osoide del hombre sorprendió a todos.
C1 noun /ˈʌp.rɔːr/

Uproar

alboroto; ruido; disturbio
Meaning
a loud and emotional noise or disturbance; public outcry
Example
The announcement caused an uproar among the students.
El anuncio causó un alboroto entre los estudiantes.
B2 adjective /ˌʌnˈkɔːrdɪneɪtɪd/

uncoordinated

descoordinado
Meaning
lacking coordination, not well-organized or clumsy in movement
Example
His movements were uncoordinated, making him prone to accidents.
Sus movimientos eran descoordinados, lo que lo hacía propenso a accidentes.
B2 adjective /ˌʌndɪˈsaɪdɪd/

Undecided

indeciso; incierto
Meaning
not having made a decision; uncertain
Example
She was undecided about which college to attend.
Ella estaba indecisa sobre qué universidad asistir.
C1 verb /ˌʌndərˈsteɪt/

understate

minimizar
Meaning
To describe something as being less important or serious than it really is.
Example
He tends to understate his achievements.
Él tiende a restar importancia a sus logros.
B1 adjective /ʌnˈsɜːrtən/

Uncertain

incierto
Meaning
not able to be relied on; not known or definite; not having reliable knowledge
Example
I am uncertain about my future career plans.
Estoy incierto sobre mis planes futuros de carrera.
C2 adjective /juːˈʒʊəriəs/

usurious

usurero
Meaning
Charging excessively high interest rates on loans.
Example
The bank was accused of offering loans at usurious rates.
El banco fue acusado de ofrecer préstamos a tasas usureras.
C2 noun /ˈjuːʒəri/

usury

usura
Meaning
The practice of lending money at unreasonably high interest rates.
Example
The law strictly prohibits usury.
La ley prohíbe estrictamente la usura.
B2 adjective /ˌʌnkənˈvɪnsɪŋ/

Unconvincing

increíble
Meaning
failing to persuade or impress; not believable or credible
Example
His excuse for being late was completely unconvincing.
Su excusa por llegar tarde era completamente increíble.
A2 noun /ˈʌndərweər/

underwear

ropa interior
Meaning
Clothing worn beneath outer clothes, typically next to the skin.
Example
He bought new underwear for the trip.
Compró ropa interior nueva para el viaje.
C2 noun /ˈʌp.wel.ɪŋ/

upwelling

Fenómeno oceanográfico que implica el movimiento de agua densa, fría y rica en nutrientes hacia la superficie del océano.
Meaning
An oceanographic phenomenon that involves wind-driven motion of dense, cooler, and nutrient-rich water towards the ocean surface.
Example
Upwelling brings nutrients to the ocean surface.
El upwelling lleva nutrientes a la superficie del océano.
B2 adjective /ʌnˈbreɪkəbəl/

Unbreakable

no se puede romper o dañar; muy fuerte y duradero
Meaning
not able to be broken or damaged; very strong and durable
Example
Their friendship formed an unbreakable bond.
Su amistad formó un vínculo inquebrantable.
C1 adjective /ʌnˈmaɪndfəl/

Unmindful

despreocupado; descuidado;
Meaning
not paying attention; careless; heedless
Example
She was unmindful of the danger around her.
Ella no prestaba atención al peligro a su alrededor.
C2 noun /juːˈkeɪs/

ukase

decreto
Meaning
An authoritative decree or order, especially one issued by a sovereign or government.
Example
The czar issued a ukase restricting the freedom of the press.
El zar emitió un decreto que restringía la libertad de prensa.
C1 adjective ʌnˈmætʃt

unmatched

incomparable
Meaning
Not equaled or rivaled by any other; without equal.
Example
The freedom fighters showed unmatched bravery.
Los luchadores por la libertad demostraron valentía incomparable.
A1 adjective /ˈjuːs.fəl/

Useful

útil; práctico
Meaning
having a beneficial purpose; practical
Example
This tool is very useful for fixing problems.
Esta herramienta es muy útil para resolver problemas.
A2 noun /ʌmˈbrɛlə/

umbrella

paraguas
Meaning
A device used for protection against rain or sun, typically consisting of a collapsible canopy mounted on a central rod.
Example
She opened her umbrella as it started to rain.
Ella abrió su paraguas cuando empezó a llover.
B2 adjective /ʌnprɪˈpɛrd/

Unprepared

despreparado
Meaning
not ready or able to deal with something
Example
He was unprepared for the difficult exam.
Él estaba desprevenido para el examen difícil.
B2 adjective /ʌnˈfɪt/

Unfit

inepto; inapropiado;
Meaning
not in good physical condition; unsuitable or inappropriate
Example
He was declared unfit for military service due to his poor health.
Él fue declarado no apto para el servicio militar debido a su mala salud.
B2 adjective /ˌʌndɪˈzaɪərəbl/

Undesirable

indeseable; perjudicial; desagradable
Meaning
not wanted or wished for; harmful or unpleasant
Example
The new policy had several undesirable consequences.
La nueva política tuvo varias consecuencias indeseables.
B1 verb /ˈʌpˌɡreɪd/

upgrade

actualizar
Meaning
to raise something to a higher standard, improve
Example
We decided to upgrade the software to the latest version.
Decidimos actualizar el software a la última versión.
B2 adjective /ʌnˈkɒmən/

uncommon

poco común
Meaning
rare, unusual, or remarkable
Example
It is uncommon to see snow in this region.
Es raro ver nieve en esta región.
C1 adjective /ˌʌnəˈfɛktɪd/

unaffected

inafectado, genuino
Meaning
Not influenced or touched by something; genuine and natural.
Example
He remained unaffected by the criticism and kept working hard.
Él permaneció sin verse afectado por la crítica y siguió trabajando duro.
B2 adjective /ʌnˈwɪl.ɪŋ/

Unwilling

reacio; reticente;
Meaning
not ready to do something; reluctant; not wanting to do
Example
He was unwilling to share his secret with anyone.
Él no quería compartir su secreto con nadie.
B2 adjective /ʌnˈwaɪz/

unwise

imprudente
Meaning
Showing poor judgment; not sensible or prudent.
Example
It would be unwise to invest all your money in one company.
Sería imprudente invertir todo tu dinero en una sola empresa.
C2 adjective /ˌʌnrɪˈmɪtɪŋ/

unremitting

ininterrumpido
Meaning
Never relaxing or stopping; persistent.
Example
Her unremitting efforts finally paid off.
Sus esfuerzos ininterrumpidos finalmente dieron fruto.
C1 noun /ˌʌnriˈælɪti/

unreality

irrealidad
Meaning
the state or quality of being unreal; lack of reality or truth
Example
The dreamlike setting gave the story a sense of unreality.
El escenario onírico dio a la historia una sensación de irrealidad.
C1 adjective /ˌʌnprɪˈtɛnʃəs/

unpretentious

modesto
Meaning
modest; not attempting to impress others with appearance or importance
Example
She lives in an unpretentious home but is very happy.
Ella vive en una casa modesta pero es muy feliz.
C1 adjective ʌnˈwɔːr.rən.tɪd

unwarranted

innecesario
Meaning
Not justified or necessary; without good reason.
Example
His anger toward the staff was completely unwarranted.
Su enojo hacia el personal fue completamente innecesario.
C1 adjective /ʌnˈvaɪəbl/

unviable

inválido
Meaning
Not capable of working successfully; not feasible or practical.
Example
The project was deemed unviable due to high costs.
El proyecto fue considerado inviable debido a los altos costos.
C1 noun /ˈʌp.ʃɒt/

Upshot

resultado; conclusión
Meaning
the final result or outcome of a series of events; conclusion
Example
The upshot of the meeting was a decision to postpone the project.
El resultado de la reunión fue una decisión de posponer el proyecto.
C1 adjective /ʌnˈvɔɪst/

unvoiced

no expresado
Meaning
not expressed in speech; in phonetics, a sound produced without vocal cord vibration
Example
The student kept her opinion unvoiced during the meeting.
La estudiante mantuvo su opinión no expresada durante la reunión.
C2 adjective /ʌnˈflæpəbəl/

unflappable

imperturbable
Meaning
calm and composed, especially in difficult situations
Example
Despite the crisis, he remained unflappable and confident.
A pesar de la crisis, se mantuvo imperturbable y confiado.
B1 verb /ʌnˈræp/

unwrap

desenvolver
Meaning
remove wrapping or covering from something; reveal something gradually or clearly
Example
She carefully unwrapped the gift with excitement.
Ella desenvolvió el regalo con cuidado y emoción.
C1 adjective /ˌʌnɪmˈplɔɪəbəl/

unemployable

desempleable
Meaning
Not able to be employed; lacking the skills or qualities necessary for employment
Example
Due to his criminal record, he was considered unemployable in most companies.
Debido a su historial criminal, fue considerado desempleable en la mayoría de las empresas.
C1 noun /ʌnɪmˈpɔːrtəns/

unimportance

insignificancia
Meaning
the state or quality of being insignificant or not important
Example
He dismissed the issue with a sense of unimportance.
Él desestimó el asunto con un sentido de falta de importancia.
B1 adjective /ʌnˈwel/

Unwell

enfermo; indispuesto
Meaning
not in good health; feeling sick or ill
Example
She has been feeling unwell since yesterday.
Ella ha estado sintiéndose mal desde ayer.
B2 verb /ˈjuːtɪlaɪz/

utilize

utilizar
Meaning
to make practical or effective use of something
Example
The company aims to utilize solar energy for production.
La compañía tiene como objetivo utilizar energía solar para la producción.
B1 adverb /ˌʌpsaɪd ˈdaʊn/

Upside-down

al revés
Meaning
with the upper part at the bottom; in or into a reversed position
Example
The picture was hanging upside-down on the wall.
La foto estaba colgada al revés en la pared.
B1 adjective /ˌʌnbɪˈliːvəbəl/

Unbelievable

increíble
Meaning
impossible to believe; extremely surprising or remarkable
Example
The magician's performance was absolutely unbelievable.
La actuación del mago fue absolutamente increíble.
C1 adjective /ˌʌnrɪˈkwaɪtɪd/

unrequited

no correspondido
Meaning
Not returned or reciprocated, especially in the context of love or affection.
Example
He suffered from unrequited love for years.
Él sufrió de amor no correspondido durante años.
A1 adverb /ˈjuː.ʒu.ə.li/

Usually

habitualmente; usualmente
Meaning
in most cases; generally; as a rule
Example
I usually wake up at 7 AM every morning.
Normalmente me despierto a las 7 AM cada mañana.
A1 verb /ˌʌndərˈstænd/

understand

entender
Meaning
to know the meaning of something; to comprehend
Example
Do you understand the instructions?
¿Entiendes las instrucciones?
C2 adjective /ʌnˈsʌlid/

unsullied

inmaculado
Meaning
not spoiled or made impure; perfectly clean or pure
Example
His reputation remained unsullied despite the accusations.
Su reputación permaneció inmaculada a pesar de las acusaciones.
C2 verb /ˈʌndjʊleɪt/

undulate

ondular
Meaning
To move with a smooth, wave-like motion.
Example
The snake undulated across the sand.
La serpiente onduló a través de la arena.
A2 adjective /ʌnˈhæp.i/

Unhappy

descontento; triste
Meaning
not happy; feeling sad or displeased; unfortunate or undesirable
Example
He was unhappy with the results of his exam.
Él estaba descontento con los resultados de su examen.
B2 adjective /ʌnˈhɜːrt/

unhurt

ileso
Meaning
Not injured or harmed.
Example
She walked away from the accident unhurt.
Ella caminó lejos del accidente sin sufrir daño.
C2 adjective /ˌʌnəˈʃʊəd/

unassured

inseguro
Meaning
Lacking confidence or certainty.
Example
She gave an unassured answer during the interview.
Ella dio una respuesta insegura durante la entrevista.
A1 noun /ˈʌŋkəl/

uncle

tío
Meaning
the brother of one's father or mother
Example
My uncle is visiting us next week.
Mi tío nos visitará la próxima semana.
C2 noun /ˈʌn.dɚˌstɔː.ri/

understory

vegetación inferior
Meaning
The layer of vegetation beneath the main canopy of a forest.
Example
The understory of a rainforest is home to small mammals and insects.
La vegetación inferior de un bosque tropical es hogar de pequeños mamíferos e insectos.
B2 adjective /ʌnˌkənˈfɜːmd/

Unconfirmed

no confirmado; no verificado;
Meaning
not confirmed as true or definite; not verified or substantiated
Example
The report remains unconfirmed until we receive official verification.
El informe sigue sin confirmar hasta que recibamos la verificación oficial.
C1 adjective /ʌnˈsəʊʃəbl/

unsociable

poco sociable
Meaning
not enjoying the company of others; avoiding social interaction
Example
He became unsociable after moving to a new city.
Se volvió poco sociable después de mudarse a una nueva ciudad.
C2 noun /ˈʌndərlɪŋ/

underling

subordinado
Meaning
a person of low rank or importance; a subordinate
Example
The manager ordered his underlings to finish the task quickly.
El gerente ordenó a sus subordinados terminar la tarea rápidamente.
C1 adverb /ʌnˈnætʃrəli/

unnaturally

de manera antinatural
Meaning
in a way that is not natural or normal; excessively or strangely
Example
He smiled unnaturally, making everyone feel uncomfortable.
Sonrió de manera antinatural, haciendo que todos se sintieran incómodos.
B2 adjective /ʌnˈendɪŋ/

Unending

interminable
Meaning
continuing forever; without end
Example
The unending rain made the day feel gloomy.
La lluvia interminable hizo que el día se sintiera triste.
C1 adjective /ˌʌnəˈsjuːmɪŋ/

unassuming

modesto
Meaning
Not pretentious or arrogant; modest.
Example
Despite his success, he remained unassuming and humble.
A pesar de su éxito, siguió siendo modesto y humilde.
B1 adjective /ˈɜːrbən/

urban

urbano
Meaning
related to, characteristic of, or situated in a city or town
Example
Urban areas often have higher population density than rural areas.
Las áreas urbanas suelen tener una mayor densidad de población que las áreas rurales.
A1 adjective /juːzd/

used

usado
Meaning
having already been used
Example
This is a used car.
Este es un coche usado.
C2 noun /ˈʌŋkʃən/

unction

unción
Meaning
The act of anointing as part of a religious or ceremonial ritual; excessive or insincere flattery.
Example
The priest performed the holy unction with solemnity.
El sacerdote realizó la santa unción con solemnidad.
B2 noun /ˈʌndərˌteɪkɪŋ/

undertaking

empresa
Meaning
A task, project, or responsibility that someone agrees to do.
Example
Starting a new company is a difficult undertaking.
Empezar una nueva empresa es una empresa difícil.
B1 verb /ʌnˈpæk/

unpack

desempacar
Meaning
to remove items from a container; to explain or analyze something in detail
Example
After arriving home, she began to unpack her suitcase.
Después de llegar a casa, empezó a desempacar su maleta.
C2 adjective /ʌnˈkɒnʃənəbl/

unconscionable

injustificable
Meaning
shockingly unfair or unreasonable
Example
The company made unconscionable profits from the crisis.
La empresa hizo ganancias injustificables durante la crisis.
C2 noun /juːˌtɪlɪˈtɛəriənɪzəm/

utilitarianism

utilitarismo
Meaning
The ethical theory that actions are right if they are useful or for the benefit of the majority.
Example
Utilitarianism suggests that we should act to maximize overall happiness.
El utilitarismo sugiere que debemos actuar para maximizar la felicidad general.
C2 adjective /ʌpˈrɔːr.i.əs/

uproarious

sumamente cómico
Meaning
Extremely funny or noisy; causing loud laughter or commotion.
Example
The comedian's jokes were absolutely uproarious.
Los chistes del comediante fueron absolutamente sumamente cómicos.
B2 adjective /ʌnˈraɪp/

Unripe

inmaduro
Meaning
not fully developed or matured; not ready to be eaten
Example
The unripe bananas will turn yellow in a few days.
Las bananas no maduras se pondrán amarillas en unos días.
A2 adjective /ˈʌɡ.li/

Ugly

feo; repulsivo; desagradable
Meaning
unpleasant or repulsive in appearance; morally reprehensible
Example
The old building looked ugly after years of neglect.
El edificio viejo se veía feo después de años de descuido.
B2 verb /ˌʌndərˈskɔːr/

underscore

subrayar
Meaning
to emphasize or highlight something
Example
The incident underscored the need for better safety measures.
El incidente subrayó la necesidad de mejores medidas de seguridad.
C1 adjective /ʌnˈtʌtʃəbəl/

Untouchable

intocable; más allá de la crítica o el ataque
Meaning
not able to be touched or affected; beyond criticism or attack
Example
The CEO seemed untouchable despite the scandal.
El CEO parecía intocable a pesar del escándalo.
C2 adjective /ʌnˈmɪtɪɡeɪtɪd/

unmitigated

completo
Meaning
absolute; not lessened or moderated
Example
The meeting was an unmitigated disaster.
La reunión fue un desastre completo.
C1 adjective /ʌnˈɡɑː.dɪd/

Unguarded

desprotegido, descuidado
Meaning
not protected or defended; careless about revealing private thoughts or information
Example
In an unguarded moment, she revealed her true feelings about the project.
En un momento sin protección, ella reveló sus verdaderos sentimientos sobre el proyecto.
C2 verb /ˈʌndərˌraɪt/

underwrite

garantizar apoyo financiero
Meaning
To guarantee financial support, especially by agreeing to cover losses or risks; in insurance, to assess and accept risks.
Example
The bank agreed to underwrite the company's new bond issue.
El banco acordó asegurar la nueva emisión de bonos de la empresa.
C1 adjective /ˌʌnkɒnstɪˈtuːʃənəl/

Unconstitutional

inconstitucional
Meaning
not in accordance with a political constitution; violating constitutional principles
Example
The court declared the new law unconstitutional.
El tribunal declaró que la nueva ley era inconstitucional.
C1 adjective /ʌlˈtɪəriər/

ulterior

motivo oculto
Meaning
hidden or secret, often with a selfish motive
Example
He invited her with an ulterior motive.
La invitó con un motivo oculto.
B2 adjective /ʌnˈriːzənəbəl/

unreasonable

irrazonable
Meaning
not guided by reason or fairness; excessive or extreme beyond what is acceptable
Example
The manager made an unreasonable demand that no one could realistically meet.
El gerente hizo una exigencia irrazonable.
C2 noun juːˈbɪkwɪti

ubiquity

ubicuidad
Meaning
The fact of appearing everywhere or of being very common.
Example
The ubiquity of smartphones has transformed communication.
La ubicuidad de los teléfonos inteligentes ha transformado la comunicación.
B1 adjective /ʌnˈfeər/

Unfair

injusto; desleal;
Meaning
not right or just; treating people in a way that favors some over others
Example
It's unfair to blame her for something she didn't do.
Es injusto culparla por algo que no hizo.
C1 adjective ʌnˈtʃɑːtɪd

uncharted

inexplorado
Meaning
Not mapped or surveyed; unknown or unexplored.
Example
The mission aimed to explore uncharted areas of the planet.
La misión tenía como objetivo explorar áreas inexploradas del planeta.
B1 adverb /ʌnˈfɔːrtʃənətli/

Unfortunately

desafortunadamente
Meaning
used to express regret or disappointment about something
Example
Unfortunately, the weather was bad for our picnic.
Desafortunadamente, el tiempo estuvo mal para nuestro picnic.
C1 verb /ʌnˈnɜːrv/

unnerve

perder la confianza
Meaning
to make someone lose confidence, courage, or composure
Example
The hostile questions began to unnerve the witness.
Las preguntas hostiles comenzaron a poner nervioso al testigo.
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 /ˌjuːtɪlɪˈtɛəriən/

utilitarian

utilitario
Meaning
Designed to be useful or practical rather than attractive; relating to the doctrine that actions are right if they are useful or for the benefit of a majority.
Example
The building had a simple utilitarian design.
El edificio tenia un diseno utilitario simple.
C1 adjective /ˌʌnəkˈnɒlɪdʒd/

unacknowledged

no reconocido
Meaning
Not recognized, admitted, or accepted; ignored or unnoticed
Example
Her contributions to the project went unacknowledged.
Sus contribuciones al proyecto pasaron desapercibidas.
C1 adjective /ʌnˈsɜːrvɪsəbəl/

Unserviceable

inservible; defectuoso
Meaning
not in working order; unable to be used; defective
Example
The old computer became unserviceable after the system crash.
La computadora vieja se volvió inservible después del fallo del sistema.
B2 noun /ˈʌndərkləʊðz/

underclothes

ropa interior
Meaning
Clothing worn beneath outer clothes, such as underwear or lingerie
Example
He folded his underclothes neatly before packing them.
Él dobló su ropa interior cuidadosamente antes de empacarla.
B1 adjective /ʌnˈnesəseri/

Unnecessary

innecesario; innecesario
Meaning
not needed; not required; pointless
Example
The meeting was unnecessary since all decisions were already made.
La reunión fue innecesaria ya que todas las decisiones ya se habían tomado.
C2 adjective /ʌnˈblʌʃɪŋ/

Unblushing

descarado; sinvergüenza
Meaning
showing no shame or embarrassment; boldly shameless
Example
He told the unblushing lie without any hesitation.
Él dijo la mentira descarada sin dudar.
C2 adjective /ˌʌnɪkˈsɛpʃənəbl/

unexceptionable

irreprochable
Meaning
Not open to objection; acceptable and unobjectionable
Example
His behavior was unexceptionable throughout the event.
Su comportamiento fue irreprochable durante el evento.
C2 adjective /ˌʌnəˈsweɪdʒd/

unassuaged

inquieto
Meaning
Not made less intense or relieved; unrelieved.
Example
His grief remained unassuaged despite the passage of time.
Su dolor permaneció inquieto a pesar del paso del tiempo.
B2 noun /juːˈtɪl.ə.ti/

Utility

utilidad; beneficio; servicio público
Meaning
the state of being useful, profitable, or beneficial; a public service
Example
The utility of solar panels increases with rising electricity costs.
La utilidad de los paneles solares aumenta con el aumento de los costos de electricidad.
C2 adjective /ʌnˈstɪntɪŋ/

unstinting

generoso
Meaning
given generously without holding back
Example
She received unstinting support from her family.
Ella recibió un apoyo generoso de su familia.
B2 noun /ˈɜː.dʒən.si/

Urgency

urgencia
Meaning
the quality of requiring immediate action or attention; pressing importance
Example
The urgency of the situation required immediate medical attention.
La urgencia de la situación requirió atención médica inmediata.
C2 adjective /ˌʌnpriːpəˈzɛsɪŋ/

unprepossessing

poco atractivo
Meaning
not attractive or appealing in appearance
Example
Despite his unprepossessing looks, he was very kind and intelligent.
A pesar de sus poco atractivos rasgos, era muy amable e inteligente.