Under wear
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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.
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.
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.
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.
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.
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 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.
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 /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.
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 adjective /juːˈbɪkwɪtəs/

ubiquitious

ubicuo
Meaning
Present, appearing, or found everywhere.
Example
Smartphones have become ubiquitous in modern society.
Los teléfonos inteligentes se han vuelto ubicuos en la sociedad moderna.
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 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.
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.
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.
C2 adjective /ʌnˈlɛtəd/

unlettered

analfabeto
Meaning
lacking education or the ability to read and write; illiterate
Example
The unlettered villagers relied on oral traditions to preserve their history.
Los aldeanos analfabetos dependían de las tradiciones orales para preservar su historia.
C1 noun /juːnəˈnɪməti/

Unanimity

unanimidad
Meaning
complete agreement among all members of a group
Example
The committee reached unanimity on the new policy.
El comité alcanzó la unanimidad sobre la nueva política.
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.
B1 adjective /ʌnˈplɛz.ənt/

Unpleasant

desagradable
Meaning
not giving or causing pleasure; disagreeable
Example
The medicine had an unpleasant taste.
El medicamento tenía un sabor desagradable.
B2 adjective /ʌnˈhɜːd/

Unheard

no escuchado; desconocido
Meaning
not heard or listened to; not given a hearing; unknown or unfamiliar
Example
His complaints went unheard by the management.
Sus quejas pasaron desapercibidas por la gerencia.
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.
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.
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.
C2 adjective /ˌʌnrɪˈmɪtɪŋ/

unremitting

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

ultimately

finalmente
Meaning
in the end, after everything else
Example
Ultimately, we decided to go ahead with the project.
Finalmente, decidimos continuar con el proyecto.
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.
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 /ʌnˈsɪvəl/

Uncivil

grosero; descortés;
Meaning
not polite or courteous; rude and discourteous in behavior
Example
His uncivil remarks during the meeting offended everyone present.
Sus comentarios incivilizados durante la reunión ofendieron a todos los presentes.
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.
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 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 /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 /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.
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.
B2 adjective /ʌnˈwel.kəm/

Unwelcome

desagradable; no deseado; indeseado
Meaning
not wanted or accepted; not invited or pleasant
Example
The unwelcome news ruined their vacation plans.
Las malas noticias arruinaron sus planes de vacaciones.
C1 noun /ˌʌnprɪˈdɪktəˌbɪləti/

unpredictability

imprevisibilidad
Meaning
The quality of being impossible to predict or anticipate.
Example
The unpredictability of the weather made the trip uncertain.
La imprevisibilidad del clima hizo que el viaje fuera incierto.
C2 adjective /ʌnˈwəʊntɪd/

unwonted

inusitado
Meaning
Unusual, uncommon, or out of the ordinary.
Example
She spoke with an unwonted gentleness that surprised everyone.
Ella habló con una suavidad inusual que sorprendió a todos.
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.
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.
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.
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.
B1 adjective /ʌnˈedjʊkeɪtɪd/

Uneducated

analfabeto; no educado
Meaning
lacking education; not having received formal schooling or training
Example
Many uneducated workers struggle to find well-paying jobs.
Muchos trabajadores analfabetos luchan por encontrar empleos bien remunerados.
B2 adjective /ˌʌnəˈweər/

Unaware

inconsciente; ajeno; sin saber
Meaning
not knowing or realizing; having no knowledge of something
Example
She was completely unaware of the danger.
Ella estaba completamente inconsciente del peligro.
B2 adjective /ˌʌnrɪˈlaɪəbl/

Unreliable

no confiable; no se puede confiar ni depender de él
Meaning
not dependable; not able to be trusted or relied upon
Example
The old car is unreliable and breaks down frequently.
El coche viejo no es confiable y se descompone con frecuencia.
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 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.
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.
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.
C1 adjective /ˌʌnrɪˈfaɪnd/

unrefined

sin refinar
Meaning
not processed or purified; lacking polish or sophistication
Example
The unrefined oil must be processed before it can be used as fuel.
El aceite sin refinar debe procesarse antes de usarse como combustible.
C1 adjective ʌnˈskruːpjʊləs

unscrupulous

deshonesto
Meaning
Having or showing no moral principles; not honest or fair.
Example
Unscrupulous peers can lead adolescents to delinquency.
Los compañeros deshonestos pueden llevar a los adolescentes a la delincuencia.
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.
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.
C1 noun ˈʌp.raɪ.zɪŋ

uprising

levantamiento
Meaning
An act of resistance or rebellion; a revolt against an authority or government.
Example
The uprising marked the beginning of the revolution.
El levantamiento marcó el comienzo de la revolución.
B2 adjective /ʌnfəˈmɪl.jər/

Unfamiliar

desconocido; extraño
Meaning
not known or recognized; strange
Example
The city was unfamiliar to me since I had never been there before.
La ciudad me era desconocida porque nunca había estado allí antes.
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.
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.
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 /ˌʌnprɪˈdɪktəbəl/

unpredictable

impredecible
Meaning
not able to be predicted; changing suddenly and unexpectedly
Example
The weather in this region is highly unpredictable.
El clima en esta región es muy impredecible.
C1 noun /ʌnˈfeɪθfʊlnəs/

unfaithfulness

infidelidad
Meaning
the quality of being disloyal or not faithful; breach of trust or fidelity
Example
His unfaithfulness led to the end of their marriage.
Su infidelidad llevó al fin de su matrimonio.
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.
B2 adverb /ʌnˈsɜːrtənli/

uncertainly

con incertidumbre
Meaning
in a way that shows doubt or lack of certainty
Example
She glanced uncertainly at the complicated instructions.
Ella miró las instrucciones complicadas con incertidumbre.
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.
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.
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 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.
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.
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 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 /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 /ʌnˈfrɛndli/

unfriendly

antipático
Meaning
not kind or welcoming; hostile or cold in behavior or attitude
Example
The shop owner seemed unfriendly to new customers.
El dueño de la tienda parecía antipático con los nuevos clientes.
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.
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.
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 noun /ˈʌndərdɒɡ/

underdog

desvalido
Meaning
a competitor thought to have little chance of winning; a weaker party in a contest
Example
The underdog team surprised everyone by winning the championship.
El equipo desvalido sorprendió a todos al ganar el campeonato.
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.
C1 adjective /ʌnˈwɪtɪŋ/

unwitting

inconsciente
Meaning
Not aware of what is happening; done without realizing.
Example
She became an unwitting participant in the scam.
Se convirtió en una participante inconsciente en la estafa.
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.
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.
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 /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.
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.
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.
B2 adjective /ʌnˈprɒf.ɪ.tə.bl̩/

Unprofitable

no rentable
Meaning
not yielding profit or gain; not producing financial benefit
Example
The unprofitable business was forced to close down after three years.
El negocio no rentable se vio obligado a cerrar después de tres años.
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.
B2 verb /ˌʌndərˈɡoʊ/

undergo

someterse
Meaning
to go through something, especially something unpleasant or difficult
Example
She had to undergo surgery to recover.
Tuvo que someterse a cirugía para recuperarse.
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.
C1 adjective /ʌnˈhoʊli/

Unholy

impío; perverso; profano
Meaning
wicked; sinful; profane
Example
The unholy alliance between the two companies caused public outrage.
La alianza impía entre las dos compañías causó indignación pública.
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 /ʌnˈriːdəbl/

unreadable

ilegible
Meaning
not able to be read or understood clearly; illegible
Example
The doctor’s handwriting was completely unreadable.
La letra del médico era completamente ilegible.
A2 noun /ˌʌndərˈstændɪŋ/

understanding

comprensión
Meaning
the ability to grasp the meaning, significance, or nature of something
Example
Her understanding of the issue was impressive.
Su comprensión del tema fue impresionante.
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.
A1 adjective /juːzd/

used

usado
Meaning
having already been used
Example
This is a used car.
Este es un coche usado.
B2 verb /ˌʌndərˈmaɪn/

undermine

socavar
Meaning
to gradually weaken or damage something or someone
Example
Constant criticism can undermine a child's confidence.
La crítica constante puede socavar la confianza de un niño.
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.
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.
C2 noun/verb /ˈʌpˌkæst/

upcast

lanzar hacia arriba
Meaning
Verb: To cast or throw upward. Noun: Something thrown or directed upward.
Example
The fisherman upcast his net into the air.
El pescador lanzó su red al aire.
C1 verb /ˌʌn.dəˈtʃɑːrdʒ/

undercharge

cobrar menos
Meaning
To charge less than the correct or fair amount.
Example
The shopkeeper accidentally undercharged me for the groceries.
El tendero accidentalmente me cobró menos por las compras.
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.
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.
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 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.
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 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.
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.
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.
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 /ˌjuːnɪˈsɛljʊlər/

unicellular

unicelular
Meaning
Consisting of a single cell.
Example
Amoebas are unicellular organisms.
Las amibas son organismos unicelulares.
C2 verb /ˌʌn.dɪˈsiːv/

undeceive

desengañar
Meaning
To free someone from a misconception or false belief.
Example
She tried to undeceive him about the false rumors.
Ella trató de desengañarlo sobre los rumores falsos.
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.
B2 noun /ʌnˈkɒnʃəsnəs/

unconsciousness

inconsciencia
Meaning
the state of being unaware of and unable to respond to one's surroundings
Example
After the accident, he was in a state of unconsciousness for several hours.
Después del accidente, él estuvo en estado de inconsciencia durante varias horas.
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.
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 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.
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.
B2 adjective /ʌnˈhɛlpfəl/

unhelpful

poco útil
Meaning
not providing help or support; making a situation harder rather than easier
Example
His unhelpful attitude slowed down the entire project.
Su actitud poco útil retrasó todo el proyecto.
B2 adjective /ˌʌnˈnoʊ.tɪst/

Unnoticed

desapercibido; ignorado
Meaning
not seen or observed; ignored
Example
His hard work went unnoticed by his manager.
Su arduo trabajo pasó desapercibido por su gerente.
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 /ʌnˈfeɪ.vər.ə.bəl/

Unfavourable

desfavorable; adverso
Meaning
not helpful or advantageous; adverse
Example
The weather conditions were unfavourable for our outdoor event.
Las condiciones climáticas fueron desfavorables para nuestro evento al aire libre.
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.
B1 adjective /ʌnˈwɒn.tɪd/

Unwanted

no deseado
Meaning
not desired or welcome; not wanted
Example
He felt like an unwanted guest at the meeting.
Él se sintió como un invitado no deseado en la reunión.