unability
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B2 noun /ʌnəˈbɪləti/

unability

incapacidad
Meaning
the state of being unable to do something; incapacity
Example
His unability to solve the problem caused delays in the project.
Su incapacidad para resolver el problema causó retrasos en el proyecto.
A2 noun /ˌʌpˈsteəz/

Upstairs

piso superior
Meaning
on or to an upper floor of a building; the upper floor or floors
Example
She went upstairs to her bedroom to rest.
Ella subió al piso de arriba a su dormitorio para descansar.
C1 verb /ʌpˈruːt/

uproot

desarraigar
Meaning
To pull something out of the ground; to remove or displace completely.
Example
They uprooted the old tree from the garden.
Ellos desenterraron el viejo árbol del jardín.
B2 adjective /ˌjuːnɪˈvɜːrsəl/

Universal

universal
Meaning
applicable to all cases; existing everywhere
Example
Music is a universal language that everyone understands.
La música es un lenguaje universal que todos entienden.
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.
C1 adjective /ˌʌnɪnˈhɪbɪtɪd/

uninhibited

desinhibido
Meaning
Not restrained or restricted; free in behavior or expression.
Example
She gave an uninhibited laugh at the joke.
Ella dio una risa desinhibida al chiste.
C1 adjective /ʌnˈtaɪmli/

Untimely

precipitado
Meaning
happening at an inappropriate or inconvenient time; premature
Example
His untimely death at the age of thirty shocked everyone.
Su muerte precipitada a la edad de treinta años sorprendió a todos.
B2 adjective /ʌnˈnætʃərəl/

Unnatural

antinatural
Meaning
not existing in nature; artificial; forced
Example
The actor's smile looked unnatural and forced.
La sonrisa del actor parecía antinatural y forzada.
B2 adjective /ˌʌnrɪˈzɒlvd/

unresolved

no resuelto
Meaning
not solved or settled; remaining undecided or unclear
Example
The dispute remains unresolved despite several meetings.
La disputa sigue sin resolverse a pesar de varias reuniones.
C1 adjective /ʌnˈkæni/

uncanny

extraño
Meaning
Strange or mysterious, especially in an unsettling way.
Example
She has an uncanny ability to predict the future.
Ella tiene una extraña habilidad para predecir el futuro.
B1 adjective /ʌnˈjuː.ʒu.əl/

Unusual

inusual; extraño;
Meaning
not typical; strange; different from what is normal
Example
She wore an unusual dress to the party.
Ella llevaba un vestido inusual a la fiesta.
C1 noun /ˈʌp.tɜːn/

upturn

mejora
Meaning
An improvement or upward trend in a situation, especially in business or economy.
Example
The company experienced an upturn in sales last quarter.
La empresa experimentó una mejora en las ventas el último trimestre.
C1 adjective /ˌʌnˈɪntɪmeɪtɪŋ/

unintimating

sin indicios
Meaning
Not giving a hint or suggestion; not indicating.
Example
His unintimating tone gave no clue of his true feelings.
Su tono sin indicios no dio ninguna pista sobre sus verdaderos sentimientos.
B2 adjective /ˌʌn.əkˈsep.tə.bəl/

Unacceptable

inaceptable
Meaning
not satisfactory or allowable; not acceptable
Example
The quality of work was completely unacceptable.
La calidad del trabajo era completamente inaceptable.
C1 adjective + noun ʌnˈpresɪdentɪd ˈnɒlɪdʒ

unprecedented knowledge

conocimiento sin precedentes
Meaning
Information or understanding that has never been obtained or achieved before.
Example
Artemis will provide unprecedented knowledge about the solar system.
Artemis proporcionará un conocimiento sin precedentes sobre el sistema solar.
B2 adjective /ˌʌn.kəʊˈɒp.ər.ə.tɪv/

uncooperative

poco cooperativo
Meaning
not willing to help or work with others; unhelpful
Example
The witness was uncooperative and refused to answer questions.
El testigo fue poco cooperativo y se negó a responder preguntas.
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.
A2 adjective /ʌnˈkʌmf.tə.bəl/

Uncomfortable

incómodo; incómoda
Meaning
causing or feeling slight pain or physical discomfort; making someone feel embarrassed, awkward, or anxious
Example
The chair was so uncomfortable that I couldn't sit in it for more than ten minutes.
La silla era tan incómoda que no pude sentarme en ella por más de diez minutos.
B2 adverb /ʌnˈwɪlɪŋli/

unwillingly

de mala gana
Meaning
in a way that shows reluctance or lack of desire; not willingly
Example
She unwillingly agreed to attend the meeting.
Ella aceptó asistir a la reunión de mala gana.
B2 adjective /ʌnˈbiːtən/

Unbeaten

invicto; no derrotado
Meaning
not defeated; having never lost; undefeated
Example
The team remains unbeaten this season.
El equipo sigue invicto esta temporada.
C2 adjective /ˈʌndjʊləs/

undulous

ondulado
Meaning
Having a wavy surface or form.
Example
The artist painted the undulous sea at sunset.
El artista pintó el mar ondulado al atardecer.
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.
C2 adjective /ʌnˈtʃeɪst/

Unchaste

inmoral; impuro;
Meaning
not celibate; having engaged in sexual relations; lacking moral purity
Example
The conservative society considered her behavior unchaste and improper.
La sociedad conservadora consideró su comportamiento inmoral e inapropiado.
B2 adjective /ʌnˈrɪəl/

unreal

irreal
Meaning
not real or not based on reality; exaggerated or imaginary
Example
The experience felt unreal after the sudden news.
La experiencia se sintió irreal después de la noticia repentina.
C1 noun /juːˈtoʊpiə/

utopia

utopía
Meaning
An imagined perfect society or place where everything is ideal.
Example
Many philosophers dreamed of creating a utopia for humanity.
Muchos filósofos soñaron con crear una utopía para la humanidad.
A1 adverb /ʌp/

up

arriba
Meaning
towards a higher position or level
Example
He climbed up the ladder quickly.
Él subió rápidamente la escalera.
C2 noun /ˌjuːnɪˈtɛəriən/

unitarian

unitario
Meaning
A person who believes that God exists as one entity rather than as a Trinity; a member of a religious denomination that emphasizes individual freedom of belief.
Example
The Unitarian church is known for its inclusive and open-minded approach.
La iglesia unitaria es conocida por su enfoque inclusivo y de mente abierta.
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.
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.
C1 noun /ʌnkənˈsɜːrn/

Unconcern

desinterés
Meaning
lack of worry or interest; indifference
Example
She showed complete unconcern about the criticism.
Ella mostró completo desinterés por las críticas.
B1 verb /juˈnaɪt/

unite

unir
Meaning
to join together or combine; to bring people or things together
Example
The crisis helped unite the community.
La crisis ayudó a unir a la comunidad.
A2 noun /ˈjuːnɪt/

unit

unidad
Meaning
an individual thing or person regarded as a single and complete entity
Example
Each unit in the production line is carefully tested.
Cada unidad en la línea de producción se prueba cuidadosamente.
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.
B1 adjective /ˌʌnɪkˈspektɪd/

Unexpected

inesperado; sorprendente
Meaning
not expected or anticipated; surprising
Example
The unexpected news left everyone speechless.
Las noticias inesperadas dejaron a todos sin palabras.
C1 noun /ˈʌndərˌɡɑːrmənt/

undergarment

ropa interior
Meaning
a piece of clothing worn under outer clothes, usually next to the skin
Example
He bought new undergarments for the wedding.
Compró ropa interior nueva para la boda.
C1 adjective /ʌnˈfɔːltərɪŋ/

unfaltering

inquebrantable
Meaning
Steady and resolute; not weakening or hesitating
Example
She continued with unfaltering determination.
Ella continuó con una determinación inquebrantable.
C1 noun /ʌpˈhiːvəl/

upheaval

upheaval
Meaning
a violent or sudden change or disruption to something
Example
The company faced a major upheaval after the sudden resignation of its CEO.
La empresa enfrentó un gran desorden tras la repentina renuncia de su CEO.
A2 preposition /əˈpɒn/

upon

sobre
Meaning
on or immediately after
Example
Upon hearing the news, he rushed to the hospital.
Al escuchar la noticia, corrió al hospital.
C2 verb /ʌnˈkaʊtʃ/

uncouch

sacar del sofá (uso raro)
Meaning
to remove from a couch or to release from being laid down (rare/archaic usage)
Example
The surgeon attempted to uncouch the cataract.
El cirujano intentó sacar la catarata.
C1 adjective /ʌnˈdɔːntɪd/

Undaunted

Intrépido; valiente; inquebrantable;
Meaning
not intimidated or discouraged by difficulty, danger, or disappointment
Example
Despite the setbacks, she remained undaunted in pursuing her goals.
A pesar de los contratiempos, ella permaneció intrépida en la persecución de sus objetivos.
B2 adverb /ʌnˈnesəserəli/

Unnecessarily

innecesariamente
Meaning
to a greater extent than is needed; without necessity
Example
Don't worry unnecessarily about the exam.
No te preocupes innecesariamente por el examen.
C1 adjective /ʌnˈmɒdɪfaɪd/

unmodified

sin modificar
Meaning
not changed from its original form or state
Example
The data was used in its unmodified form for analysis.
Los datos se usaron en su forma sin modificar para el análisis.
B1 adjective /ˈjuːnɪfɔːrm/

Uniform

uniforme
Meaning
consistent; identical; standardized
Example
All students must wear a uniform to school.
Todos los estudiantes deben usar un uniforme en la escuela.
C2 adjective /ʌnˈtræməld/

untrammeled

libertad ilimitada
Meaning
Not restricted or hampered; free and unrestricted.
Example
She enjoyed untrammeled freedom in her new life abroad.
Disfrutó de libertad ilimitada en su nueva vida en el extranjero.
C1 adjective /ʌnˈspiːkəbl/

unspeakable

inexpresable
Meaning
too bad or shocking to be expressed in words
Example
The survivors endured unspeakable horrors during the war.
Los sobrevivientes soportaron horrores inexpresables durante la guerra.
C1 adverb /ˌʌnkənˈvɛnʃənəli/

unconventionally

poco convencionalmente
Meaning
in a way that is not based on or conforming to accepted standards or norms
Example
She dresses unconventionally, mixing bold colors and patterns that surprise everyone.
Ella se viste de manera poco convencional, combinando colores y patrones audaces que sorprenden a todos.
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 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 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.
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.
B2 noun ˌɜːbənaɪˈzeɪʃən

urbanization

urbanización
Meaning
The process by which towns and cities are formed and become larger as more people begin living and working in central areas.
Example
Urbanization leads to more developed infrastructure.
La urbanización conduce a una infraestructura más desarrollada.
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.
B2 adjective ʌnˈprɛsɪˌdɛntɪd

unprecedented

sin precedentes
Meaning
Never done or known before; without previous example.
Example
Unprecedented advancements in science changed human lives.
Los avances sin precedentes en la ciencia cambiaron la vida humana.
B2 adjective /ʌnˈfeɪθ.fəl/

Unfaithful

infiel
Meaning
not loyal or true to a spouse, partner, or commitment
Example
He was unfaithful to his wife for many years.
Él fue infiel a su esposa durante muchos años.
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.
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.
B2 verb /ʌnˈtaɪ/

untie

desatar
Meaning
to loosen or remove a knot or binding; to release something that is tied
Example
She untied the rope to free the boat.
Ella desató la cuerda para liberar el bote.
B1 adjective /ʌnˈjuzd/

Unused

sin usar; no utilizado
Meaning
not being used; not having been used before
Example
There are many unused rooms in this old mansion.
Hay muchas habitaciones sin usar en esta antigua mansión.
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.
B2 adjective /ʌnprəˈfɛʃ.ən.əl/

Unprofessional

no profesional
Meaning
not conforming to the standards expected in a particular profession
Example
His unprofessional behavior led to his dismissal from the company.
Su comportamiento no profesional llevó a su despido de la empresa.
B1 adjective /ˌʌnˈpeɪd/

Unpaid

no remunerado; sin pago
Meaning
not paid for; without payment or salary
Example
She worked as an unpaid intern for six months.
Trabajó como una pasante no remunerada durante seis meses.
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.
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.
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.
B1 adjective /ʌnˈfɔːr.tʃən.ət/

Unfortunate

desafortunado; lamentable
Meaning
having bad luck; regrettable or unlucky
Example
It was unfortunate that the meeting was cancelled at the last minute.
Fue desafortunado que la reunión se cancelara en el último minuto.
C2 adjective /ˌʌn.rɪˈdʒɛn.ər.ət/

unregenerate

intransigente
Meaning
Not reformed or showing no signs of change; stubbornly refusing to reform or repent.
Example
He remained an unregenerate opponent of progress.
Siguió siendo un oponente intransigente del progreso.
C1 adjective /ʌnˈtoʊld/

Untold

incontable; infinito
Meaning
very great in amount or degree; countless; immeasurable
Example
The earthquake caused untold damage to the city.
El terremoto causó daños incontables a la ciudad.
B1 adjective /juːˈnaɪtɪd/

United

unido; en conjunto; de acuerdo
Meaning
joined together for a common purpose; in agreement
Example
The team was united in their goal to win.
El equipo estaba unido en su objetivo de ganar.
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.
C2 adjective /ʌnˈflɛdʒd/

unfledged

inexperto
Meaning
Inexperienced, immature, or not fully developed.
Example
The unfledged writer struggled to complete his first novel.
El escritor inexperto luchó por completar su primera novela.
B2 noun ˌjuːtɪlaɪˈzeɪʃən

utilization

utilización
Meaning
The action of making practical and effective use of something.
Example
Increased plastic utilization calls for better waste management.
El aumento de la utilización del plástico requiere una mejor gestión de los residuos.
C2 adjective /ˌʌnrɪˈmɪtɪŋ/

unremitting

ininterrumpido
Meaning
Never relaxing or stopping; persistent.
Example
Her unremitting efforts finally paid off.
Sus esfuerzos ininterrumpidos finalmente dieron fruto.
B2 adjective /ˈʌt.moʊst/

Utmost

máximo; extremo
Meaning
greatest; most extreme; maximum possible
Example
She showed utmost care while handling the fragile items.
Ella mostró el máximo cuidado al manejar los artículos frágiles.
B1 adjective /ʌnˈklɪər/

unclear

poco claro
Meaning
not easy to understand; vague or ambiguous
Example
The instructions were unclear, so I asked for clarification.
Las instrucciones eran poco claras, así que pedí aclaraciones.
B2 adjective /ˌʌndɪˈstɜːrbd/

Undisturbed

ininterrumpido
Meaning
not interrupted or interfered with; calm and peaceful
Example
She slept undisturbed for eight hours.
Ella durmió ininterrumpidamente durante ocho horas.
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 adverb /ʌnˈkaɪndli/

unkindly

cruelmente
Meaning
in a cruel, harsh, or unsympathetic manner
Example
She spoke unkindly about her colleague during the meeting.
Ella habló cruelmente de su colega durante la reunión.
A2 adjective /ˈjuːs.ləs/

Useless

inútil
Meaning
having no beneficial purpose; not useful
Example
This broken computer is completely useless.
Esta computadora rota está completamente inútil.
C1 adjective /ʌnˈfɛtərd/

unfettered

libre
Meaning
not restricted or confined; free
Example
The artist enjoyed unfettered freedom of expression.
El artista disfrutó de la libertad ilimitada de expresión.
C1 adjective /ʌnˈweɪ.vər.ɪŋ/

unwavering

inquebrantable
Meaning
Steady or resolute; not wavering.
Example
He showed unwavering dedication to his goal.
Él mostró una dedicación inquebrantable hacia su meta.
C1 adjective /ʌnˈskeɪðd/

unscathed

ileso
Meaning
Without suffering any injury, damage, or harm.
Example
She escaped from the accident unscathed.
Ella escapó del accidente ilesa.
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.
B1 adjective /ʌnˈnoʊn/

Unknown

desconocido
Meaning
not known or identified; unfamiliar
Example
The author of this letter remains unknown.
El autor de esta carta sigue siendo desconocido.
B2 adjective /ʌnˈθɪŋkəbl/

Unthinkable

inimaginable
Meaning
impossible to conceive or imagine; beyond belief or consideration
Example
It was unthinkable that such a tragedy could happen in our peaceful town.
Era inimaginable que tal tragedia pudiera ocurrir en nuestra tranquila ciudad.
B2 adjective /ʌnˈbaɪəst/

unbiased

imparcial
Meaning
Not showing prejudice; impartial and fair.
Example
The report gave an unbiased view of the situation.
El informe dio una vista imparcial de la situación.
C2 adjective /ʌnˈtɛmpərd/

untempered

intempérate
Meaning
not moderated or softened; lacking proper balance or control
Example
The untempered anger of the crowd caused chaos.
La ira intempérate de la multitud causó caos.
B2 noun /ʌnˈrest/

Unrest

inquietud; disturbio; agitación social
Meaning
a state of dissatisfaction and disturbance; social or political disorder
Example
The economic crisis led to widespread social unrest.
La crisis económica llevó a una amplia inquietud social.
B2 adjective /ʌnˈɡreɪt.fəl/

Ungrateful

ingrato
Meaning
not feeling or showing thanks for something done or given; not appreciating kindness
Example
She felt he was ungrateful for all the help she had given him.
Ella sintió que él era ingrato por toda la ayuda que le había dado.
C1 adjective /ʌnˈduː/

Undue

excesivo; inapropiado; más de lo necesario o adecuado
Meaning
excessive; inappropriate; more than is necessary or proper
Example
The teacher complained about undue pressure from parents.
El maestro se quejó de la presión excesiva de los padres.
C1 adjective ʌnɪnˈhæbɪtəbəl

uninhabitable

inhabitable
Meaning
Not suitable or safe for people to live in.
Example
Rapid urbanization can make cities uninhabitable.
La rápida urbanización puede hacer que las ciudades sean inhabitables.
B1 adjective /ˌʌnˈɪntrəstɪŋ/

uninteresting

aburrido
Meaning
not holding attention or curiosity; boring
Example
The lecture was uninteresting and difficult to stay focused on.
La conferencia fue aburrida y difícil de seguir.
C1 noun /ˌʌnbɪˈliːf/

Unbelief

incredulidad
Meaning
lack of religious belief; skepticism or doubt
Example
His unbelief in the supernatural made him a skeptic.
Su incredulidad hacia lo sobrenatural lo convirtió en un escéptico.
B2 adjective /ʌnəˈfreɪd/

unafraid

sin miedo
Meaning
Not feeling fear; brave or courageous
Example
She walked into the dark room, unafraid of what might be inside.
Ella entró en la habitación oscura, sin miedo de lo que pudiera haber dentro.
B2 adverb /ʌnˈdaʊtɪdli/

undoubtedly

sin duda
Meaning
without a doubt, certainly
Example
He is undoubtedly the best player on the team.
Él es sin duda el mejor jugador del equipo.
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.
B2 adjective /ˌʌnəˈveɪləbəl/

unavailable

no disponible
Meaning
Not able to be obtained, reached, or used; not present or accessible.
Example
The manager was unavailable to take calls during the meeting.
El gerente no estaba disponible para atender llamadas durante la reunión.
C1 adjective ʌnˈpær.ə.leld

Unparalleled

incomparable
Meaning
Having no equal; unmatched, peerless, and supreme in quality or achievement.
Example
The unparalleled beauty of the Taj Mahal amazes visitors.
La belleza incomparable del Taj Mahal asombra a los visitantes.
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.
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.
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.
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 /ˈʌpərˌmoʊst/

uppermost

más alto
Meaning
situated at the highest place or most important
Example
Her family's safety was uppermost in her mind during the crisis.
La seguridad de su familia era lo más importante en su mente durante la crisis.
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.
C2 adjective /ˈʌndjʊleɪtɪŋ/

undulating

ondulante
Meaning
Having a smoothly rising and falling form or motion like waves.
Example
We drove through undulating hills.
Condujimos por colinas onduladas.
C1 adjective /ʌnˈkʌltʃəd/

Uncultured

incivilizado; sin educación
Meaning
lacking good manners, refinement, or education; uncivilized
Example
His uncultured behavior embarrassed everyone at the dinner party.
Su comportamiento incivilizado avergonzó a todos en la fiesta de la cena.
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 adjective /ʌnˈɒnəd/

unhonoured

deshonrado
Meaning
not respected or given the recognition that is deserved; treated without honor
Example
He felt unhonoured after his years of service were ignored.
Se sintió deshonrado después de que ignoraran sus años de servicio.
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.
C1 adjective /ʌnˈtʃælɪndʒd/

Unchallenged

incontestable; aceptado sin oposición; sin rival
Meaning
not disputed or questioned; accepted without opposition; having no rival
Example
He remained the unchallenged champion for five years.
Él permaneció como el campeón indiscutido durante cinco años.
C1 adjective /ʌnˈkɛmpt/

unkempt

desordenado
Meaning
Having an untidy or disheveled appearance.
Example
He looked unkempt after sleeping outdoors all night.
Se veía desordenado después de dormir al aire libre toda la noche.
C1 adjective /ʌnˈbraɪdld/

unbridled

desenfrenado
Meaning
Uncontrolled and unrestrained.
Example
The protesters showed unbridled enthusiasm for change.
Los manifestantes mostraron entusiasmo desenfrenado por el cambio.
B1 adjective /ˌʌnsəkˈsesfl/

Unsuccessful

fallido; no logrado;
Meaning
not achieving desired aims or results; failing to accomplish a purpose
Example
His unsuccessful attempt to climb the mountain left him disappointed.
Su intento fallido de escalar la montaña lo dejó decepcionado.
B2 adjective /ˌʌnkənˈvɛnʃənl/

unconventional

no convencional
Meaning
not based on or conforming to what is generally done or believed
Example
Her unconventional approach to teaching inspired her students to think creatively.
Su enfoque de enseñanza no convencional inspiró a sus estudiantes a pensar creativamente.
C1 adjective /ʌnˈkwes.tʃən.ə.bl̩/

Unquestionable

indiscutible; seguro
Meaning
not able to be disputed or doubted; certain and beyond doubt
Example
Her honesty and integrity are unquestionable qualities.
Su honestidad e integridad son cualidades indiscutibles.
C1 adjective /ʌnˈtaɪərɪŋ/

Untiring

incansable; persistente; infatigable
Meaning
continuing without stopping; persistent; tireless
Example
Her untiring efforts finally led to success.
Sus esfuerzos incansables finalmente llevaron al éxito.
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.
A2 verb /ʌpˈset/

upset

molestar
Meaning
to make someone worried, sad, or angry; to disturb
Example
The bad news upset everyone.
La mala noticia upset a todos.
B2 verb /ɜːrdʒ/

urge

instar
Meaning
to strongly encourage or try to persuade someone to do something
Example
Doctors urge patients to exercise regularly.
Los doctores instan a los pacientes a hacer ejercicio regularmente.
C1 adjective /juːˈbɪkwɪtəs/

ubiquitous

ubiquito
Meaning
Existing or being everywhere at the same time.
Example
Social media has become ubiquitous among young people.
Las redes sociales se han vuelto ubicuas entre los jóvenes.
B1 adjective /ʌnɪmˈplɔɪd/

Unemployed

desempleado
Meaning
without a job; not having paid work
Example
He has been unemployed for six months now.
Él ha estado desempleado durante seis meses.
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.