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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 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.
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 /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.
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.
B1 preposition, adverb, adjective /ˌʌndərˈniːθ/

underneath

debajo, bajo
Meaning
Located directly below or beneath something
Example
The keys were hidden underneath the pile of papers.
Las llaves estaban escondidas debajo de la pila de papeles.
C1 adjective /ˌjuːnɪˈlætərəl/

Unilateral

unilateral
Meaning
one-sided; involving only one party
Example
The country made a unilateral decision to withdraw from the treaty.
El país tomó una decisión unilateral de retirarse del tratado.
C1 adjective /ˌʌnfɔːrˈsiːn/

unforeseen

inesperado
Meaning
Not anticipated or predicted; unexpected.
Example
The project faced unforeseen challenges that delayed its completion.
El proyecto enfrentó desafíos imprevistos que retrasaron su finalización.
C1 adjective /ʌnˈsɪvəlaɪzd/

Uncivilized

incivilizado; salvaje;
Meaning
not developed in terms of civilization; lacking social organization and culture; barbarous
Example
The explorers encountered an uncivilized tribe deep in the Amazon rainforest.
Los exploradores encontraron una tribu incivilizada en lo profundo de la selva amazónica.
B1 adjective /ʌnˈmærid/

unmarried

soltero
Meaning
Not married; single.
Example
He is thirty-five and still unmarried.
Él tiene treinta y cinco años y sigue soltero.
A2 adjective /ʌnˈlʌki/

Unlucky

desafortunado; de mala suerte
Meaning
having bad luck; unfortunate
Example
He was unlucky to miss the winning shot.
Él tuvo mala suerte al perder el tiro ganador.
C2 adjective /ʌkˈsɔːriəs/

uxorious

excesivamente afectuoso con la esposa
Meaning
excessively fond of or submissive to one's wife
Example
He was so uxorious that he agreed with everything his wife said.
Él era tan uxorio que estuvo de acuerdo con todo lo que su esposa decía.
C1 adjective /ˌʌnəˈteɪnəbl/

unattainable

inalcanzable
Meaning
impossible to achieve, reach, or accomplish
Example
For many, becoming a professional athlete remains an unattainable dream.
Para muchos, convertirse en un atleta profesional sigue siendo un sueño inalcanzable.
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 verb /ˈʌndərkʌt/

undercut

rebajar precios, debilitar
Meaning
to sell at a lower price than a competitor; to weaken or undermine something
Example
The company tried to undercut its rivals by offering lower prices.
La empresa intentó undercut a sus rivales ofreciendo precios más bajos.
B1 adjective /ʌnˈkaʊntəbəl/

Uncountable

incontable; innumerable
Meaning
too many to be counted; innumerable; infinite in quantity
Example
There are uncountable stars in the night sky.
Hay estrellas incontables en el cielo nocturno.
B1 noun /ˈjuːnɪvɜːrs/

Universe

universo
Meaning
all existing matter and space; the cosmos
Example
Scientists study the universe to understand its mysteries.
Los científicos estudian el universo para entender sus misterios.
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.
A1 verb /juːz/

use

utilizar
Meaning
to employ something for a purpose; to take advantage of
Example
I use my computer for work and entertainment.
Yo uso mi computadora para trabajar y entretenerme.
B2 adjective /ˈʌl.tɪ.mət/

Ultimate

último; supremo; final
Meaning
being the best or most extreme example of its kind; final; last
Example
This is the ultimate test of your skills.
Este es el examen final de tus habilidades.
A2 verb /ʌpˈdeɪt/

update

actualizar
Meaning
to make something more modern or current; to provide new information
Example
Please update your software regularly.
Por favor, actualice su software regularmente.
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.
B1 adverb /ʌnˈjuːʒuəli/

unusually

de manera inusual
Meaning
in a way that is not typical or expected; to an uncommon degree
Example
It was unusually cold for this time of year.
Hacía un frío inusual para esta época del año.
B2 adjective /ʌnˈstɛdi/

unsteady

inestable
Meaning
not firm or stable; likely to change or fail
Example
She felt unsteady on her feet after the long journey.
Se sentía inestable después del largo viaje.
B2 adjective /ʌnˌkənˈdɪʃ.ən.əl/

Unconditional

incondicional
Meaning
not subject to any conditions; complete and absolute
Example
She offered her unconditional support to her friend in need.
Ella ofreció su apoyo incondicional a su amigo en necesidad.
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.
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.
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.
C2 adjective /ɜːrˈbeɪn/

urbane

urbano
Meaning
showing polished manners, refinement, and sophistication
Example
He was an urbane gentleman who charmed everyone at the party.
Era un caballero urbano que encantó a todos en la fiesta.
A1 adverb /ʌp/

up

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

usufruct

usufructo
Meaning
The legal right to use and enjoy the benefits of someone else’s property without owning it.
Example
The tenant had the usufruct of the land but not its ownership.
El inquilino tenía el usufructo de la tierra pero no su propiedad.
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 /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.
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.
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.
B2 adjective /ʌnˈsiːn/

Unseen

invisible; no visto ni notado anteriormente
Meaning
not previously seen or noticed; invisible; hidden
Example
The unseen forces of nature can be very powerful.
Las fuerzas invisibles de la naturaleza pueden ser muy poderosas.
B1 adjective /ˈɜːrdʒənt/

Urgent

urgente
Meaning
requiring immediate action or attention; pressing
Example
The patient needs urgent medical attention.
El paciente necesita atención médica urgente.
B2 adjective /ʌnˈsuːtəbl/

Unsuitable

inapropiado; inapto
Meaning
not fitting or appropriate for a particular purpose or situation
Example
This formal dress is unsuitable for a casual beach party.
Este vestido formal es inapropiado para una fiesta de playa casual.
A2 adjective /ˈjuːʒəl/

usual

habitual
Meaning
habitually or typically occurring or done
Example
It’s our usual meeting spot.
Es nuestro lugar habitual de reuniones.
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.
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.
C1 adjective /ˌʌnfɔːrθˈkʌmɪŋ/

unforthcoming

reacio
Meaning
Not willing to talk or provide information; uncooperative.
Example
The witness was unforthcoming about what he had seen.
El testigo fue reacio a hablar sobre lo que había visto.
C1 verb /ˌʌndərˈvæljuː/

undervalue

devaluar
Meaning
To assign too low a value or importance to something or someone.
Example
She felt that her boss consistently undervalued her contributions.
Ella sintió que su jefe constantemente no valoraba sus contribuciones.
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.
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.
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.
C1 adjective /ˌʌn.əˈdʌl.tə.reɪ.tɪd/

Unadulterated

puro
Meaning
not mixed or diluted with any different or extra elements; pure
Example
She felt unadulterated joy when she heard the news.
Sintió una alegría pura cuando escuchó la noticia.
C2 adjective /ʌnˈɡeɪnli/

ungainly

torpe
Meaning
Awkward, clumsy, or lacking grace in movement or appearance.
Example
The tall boy moved in an ungainly manner.
El chico alto se movió de manera torpe.
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 adjective /ˌʌnəˈfɪʃ.əl/

Unofficial

no oficial
Meaning
not officially authorized or confirmed; informal
Example
The unofficial results showed a close race.
Los resultados no oficiales mostraron una carrera reñida.
B2 verb /ʌnˈkʌvə(r)/

uncover

descubrir
Meaning
to reveal something that was hidden or secret
Example
The investigation uncovered new evidence.
La investigación descubrió nuevas pruebas.
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 adjective /ʌn.rɪˈleɪ.tɪd/

Unrelated

irrelevante; no relacionado
Meaning
having no connection or relationship; not connected by family ties
Example
The two incidents were completely unrelated to each other.
Los dos incidentes estaban completamente no relacionados entre sí.
C2 noun /ˈʌmbrɪdʒ/

umbrage

resentimiento, ofensa
Meaning
A feeling of resentment or offense.
Example
She took umbrage at his rude remark.
Ella se ofendió con su comentario grosero.
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.
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.
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.
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 /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.
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 /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.
C2 adjective /juːˈnɪsənənt/

unisonant

armonioso
Meaning
Sounding together or in harmony.
Example
The unisonant voices created a powerful effect.
Las voces armoniosas crearon un efecto poderoso.
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.
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 adjective /ʌnhaɪˈdʒiːnɪk/

Unhygienic

insalubre; falta de higiene adecuada
Meaning
not clean; lacking proper sanitation
Example
The restaurant was closed due to unhygienic conditions in the kitchen.
El restaurante estaba cerrado debido a condiciones insalubres en la cocina.
C1 adjective /ʌnˈkwaɪ.ət/

Unquiet

inquieto; ansioso; perturbado
Meaning
restless; unable to remain still or quiet; anxious or troubled
Example
She spent an unquiet night worrying about the exam results.
Pasó una noche inquieta preocupada por los resultados del examen.
B2 adverb /ʌnˈkɒnʃəsli/

unconsciously

inconscientemente
Meaning
without being aware of one's actions or surroundings
Example
She unconsciously tapped her foot to the rhythm of the music.
Ella inconscientemente movía el pie al ritmo de la música.
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.
B2 noun ˈjuːnəti

unity

unidad
Meaning
The state of being united or joined as a whole.
Example
Unity among people led to victory.
La unidad entre las personas llevó a la victoria.
C1 adjective /ʌnˈsoʊld/

unsold

no vendido
Meaning
not sold; remaining without a buyer
Example
The unsold goods were returned to the warehouse.
Los productos no vendidos fueron devueltos al almacén.
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 noun /ˈʌm.brə/

Umbra

sombra completa, la región oscura del centro de una mancha solar
Meaning
the fully shaded inner region of a shadow cast by an opaque object; the dark center of a sunspot
Example
During the eclipse, we stood in the moon's umbra.
Durante el eclipse, nos paramos en la umbra de la luna.
C2 adjective /ʌnˈʌtərəbl/

unutterable

inefable
Meaning
Too great, intense, or awful to be expressed or described in words.
Example
She was filled with unutterable joy at the news of her success.
Ella estaba llena de una alegría inefable al escuchar las noticias de su éxito.
C2 verb /ʌnˈkloʊð/

unclothe

desvestir; quitar la ropa
Meaning
to remove clothing from someone or something
Example
The nurse helped unclothe the patient for the examination.
La enfermera ayudó a desvestir al paciente para el examen.
C1 adjective /ʌnˈsiːmli/

unseemly

indecoroso
Meaning
Not proper or appropriate in behavior or appearance; unbecoming.
Example
His unseemly remarks embarrassed everyone at the dinner table.
Sus comentarios indecorosos avergonzaron a todos en la mesa de la cena.
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.
C1 adjective /ʌnˈθɪŋkɪŋ/

unthinking

irreflexivo
Meaning
done without careful thought; automatic or thoughtless
Example
His unthinking remark hurt her feelings.
Su comentario irreflexivo hirió sus sentimientos.
A2 noun /ˈʌndərwɛr/

Under wear

ropa interior
Meaning
clothing worn under other clothes, next to the skin
Example
She bought new underwear from the department store.
Ella compró nuevo ropa interior en la tienda departamental.
A2 noun /ˈjuːzər/

user

usuario
Meaning
a person who uses or operates something
Example
He is a frequent user of this app.
Él es un usuario frecuente de esta aplicación.
C2 adjective /ʌnˈspɛərɪŋ/

unsparing

implacable
Meaning
Showing no mercy or generosity; harsh or severe.
Example
The critic was unsparing in his review of the play.
El crítico fue implacable en su reseña de la obra.
A1 noun /ˌjuːnɪˈvɜːrsɪti/

university

universidad
Meaning
an institution of higher education and research, which grants academic degrees
Example
She is studying law at the university.
Ella está estudiando derecho en la universidad.
B2 adjective /ʌnˈtʃeɪndʒəbəl/

Unchangeable

inmutable; fijo;
Meaning
not able to be changed or altered; fixed and permanent
Example
The laws of physics are unchangeable principles that govern the universe.
Las leyes de la física son principios inmutables que rigen el universo.
B1 noun /ʌnˈhæp.i.nəs/

unhappiness

infelicidad
Meaning
the state of being unhappy; sadness or dissatisfaction
Example
Her constant unhappiness affected everyone around her.
Su constante infelicidad afectaba a todos a su alrededor.
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.
C2 adverb /ʌnˈɜːrɪŋli/

unerringly

sin cometer errores
Meaning
Without making any mistakes; always accurate
Example
The archer aimed unerringly at the target.
El arquero apuntó sin cometer errores al objetivo.
C1 noun /ˈʌndərˌwɜːrld/

underworld

submundo
Meaning
The criminal world of organized crime or the mythical world of the dead.
Example
The detective spent years studying the secrets of the underworld.
El detective pasó años estudiando los secretos del submundo.
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 /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 verb /ʌnˈɜːθ/

unearth

desenterrar
Meaning
To dig up from the ground or to discover something hidden.
Example
Archaeologists unearthed ancient artifacts at the site.
Los arqueólogos desenterraron artefactos antiguos en el sitio.
A1 preposition/conjunction /ʌnˈtɪl/

until

hasta
Meaning
up to the time of
Example
I will wait until you come back.
Esperaré hasta que regreses.
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.
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.
C2 noun /ˈʌŋɡwənt/

unguent

ungüento
Meaning
A soothing or healing ointment applied to the skin.
Example
The doctor applied an unguent to heal the burn.
El doctor aplicó un ungüento para sanar la quemadura.
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.
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.
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.
C2 adjective /ʌnˈælɔɪd/

unalloyed

puro
Meaning
Pure, complete, and not mixed with anything else.
Example
She felt unalloyed joy at the news of her success.
Ella sintió una alegría pura al recibir la noticia de su éxito.
C1 adjective /ʌnˈkuːθ/

uncouth

grosero
Meaning
Lacking good manners, refinement, or grace; awkward or rough.
Example
His uncouth behavior shocked the guests at the party.
Su comportamiento grosero sorprendió a los invitados en la fiesta.
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 adjective /ˌʌnsɛrəˈmoʊniəs/

unceremonious

sin ceremonias/rudo
Meaning
Done without formality or courtesy; abrupt or rude.
Example
He made an unceremonious exit from the party.
Él hizo una salida sin ceremonias de la fiesta.
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.
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.
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.
B2 verb /ˌʌndərˈteɪk/

undertake

emprender
Meaning
to commit to and begin a task or project; to take on responsibility
Example
She decided to undertake a challenging project.
Ella decidió emprender un proyecto desafiante.
C2 adjective /ˌʌltrəˈmʌndeɪn/

ultramundane

ultramundano
Meaning
Relating to things beyond the physical world; supernatural or transcendental.
Example
Philosophers often discuss ultramundane realities beyond human perception.
Los filósofos a menudo discuten las realidades ultramundanas más allá de la percepción humana.
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.
B2 adjective /ʌnˈwɜːrði/

Unworthy

indigno; no merecedor
Meaning
not deserving respect or attention; lacking worth or merit
Example
He felt unworthy of such praise and recognition.
Él se sintió no digno de tal alabanza y reconocimiento.
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 noun /ˈʌlsər/

ulcer

úlcera
Meaning
a sore on the skin or a mucous membrane that does not heal easily
Example
The doctor prescribed medicine to treat the stomach ulcer.
El médico recetó un medicamento para tratar la úlcera de estómago.
A2 conjunction /ʌnˈlɛs/

unless

a menos que
Meaning
except if
Example
We won't go unless it stops raining.
No iremos a menos que deje de llover.
C1 noun /ˈʌp.raɪt.nəs/

Uprightness

rectitud; integridad
Meaning
the quality of being honest and morally correct; integrity
Example
His uprightness in business dealings earned him great respect.
Su rectitud en los negocios le ganó gran respeto.
C2 adjective /ʌnˈmɪtɪɡeɪtɪd/

unmitigated

completo
Meaning
absolute; not lessened or moderated
Example
The meeting was an unmitigated disaster.
La reunión fue un desastre completo.
B1 adjective /ʌnˈtru/

Untrue

falso; incorrecto
Meaning
not true; false; incorrect
Example
His statement about the incident was completely untrue.
Su declaración sobre el incidente fue completamente falsa.
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.
B2 adjective /ʌnprəˈdʌk.tɪv/

Unproductive

improductivo; ineficaz
Meaning
not achieving much; not producing good results
Example
The meeting was unproductive and wasted everyone's time.
La reunión fue improductiva y desperdició el tiempo de todos.
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.
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.
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.
B1 adjective /ˈʌpər/

upper

superior
Meaning
higher in position or rank
Example
The upper floor of the building is under renovation.
El piso superior del edificio está en renovación.
B2 adjective /ʌnˈsteɪbəl/

Unstable

inestable
Meaning
likely to change; not steady or secure; unsteady
Example
The unstable economy made people worried about their jobs.
La economía inestable hizo que las personas se preocuparan por sus trabajos.