unmask
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C1 verb /ʌnˈmɑːsk/

unmask

desenmascarar
Meaning
to remove a mask or covering; to reveal the true identity, nature, or intentions of someone or something
Example
The investigation helped unmask the real culprit behind the crime.
La investigación ayudó a desenmascarar al verdadero culpable del crimen.
B2 adjective /ˌʌnɪnˈtenʃənəl/

Unintentional

no intencionado; accidental
Meaning
not done on purpose; accidental
Example
The damage to the car was unintentional.
El daño al coche fue no intencionado.
B1 adjective /ʌnˈlaɪkli/

Unlikely

improbable; poco probable
Meaning
not likely to happen; improbable
Example
It's unlikely to rain today with such clear skies.
Es poco probable que llueva hoy con cielos tan despejados.
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 /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.
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.
C1 adjective /ˌʌndərˈsaɪzd/

undersized

de tamaño pequeño
Meaning
Smaller than the usual or expected size.
Example
The undersized puppy struggled to keep up with its siblings.
El perrito de tamaño pequeño luchaba por mantenerse al día con sus hermanos.
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.
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.
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.
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 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.
C1 adjective /ˌʌnbɪˈliːvɪŋ/

unbelieving

incrédulo
Meaning
Not willing or able to believe; skeptical or doubtful
Example
She gave him an unbelieving look when he claimed to have met a celebrity.
Ella le dio una mirada incrédula cuando afirmó haber conocido a una celebridad.
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 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.
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 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.
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.
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.
B2 noun /ˈʌpˌkiːp/

up-keep

mantenimiento
Meaning
The process or cost of maintaining something in good condition.
Example
The upkeep of the old house is very expensive.
El mantenimiento de la casa antigua es muy caro.
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.
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.
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.
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.
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.
C2 noun /ˌjuːzɜːrˈpeɪʃən/

usurpation

usurpación
Meaning
The act of taking someone's power or property illegally or by force.
Example
The general's usurpation of the presidency led to political unrest.
La usurpación de la presidencia por el general condujo a disturbios políticos.
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 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.
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.
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.
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.
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 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 /ʌnˈskɪld/

Unskilled

no cualificado; trabajador sin habilidades
Meaning
lacking technical training or ability; not requiring special skills
Example
Many unskilled workers are looking for training opportunities.
Muchos trabajadores no cualificados están buscando oportunidades de formación.
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.
B2 adjective /ʌnˈiːkwəl/

Unequal

desigual; injusto;
Meaning
not the same in quantity, size, or value; not fair or just
Example
The distribution of wealth is unequal in many countries.
La distribución de la riqueza es desigual en muchos países.
C1 adjective ˌʌn.pəˈtɜːbd

unperturbed

no preocupado o perturbado por algo; calmado y compuesto
Meaning
Not worried or disturbed by something; calm and composed.
Example
She remained unperturbed despite the challenges.
Ella permaneció tranquila a pesar de los desafíos.
C1 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.
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.
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.
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.
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.
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 /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.
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.
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 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.
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.
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.
B2 adjective /juːˈnæn.ɪ.məs/

Unanimous

unánime
Meaning
fully in agreement; shared by all
Example
The committee reached a unanimous decision.
El comité tomó una decisión unánime.
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.
C2 noun /ɜːrˈbænɪti/

urbanity

urbanidad
Meaning
refined courtesy, elegance, and sophistication in manner
Example
Her urbanity made her popular among diplomats and leaders.
Su urbanidad la hizo popular entre diplomáticos y líderes.
B1 noun /ˈjuːs.fəl.nəs/

Usefulness

utilidad
Meaning
the quality of being useful; practical value or helpfulness
Example
The usefulness of this tool became apparent during the project.
La utilidad de esta herramienta se hizo evidente durante el proyecto.
B1 adjective /ʌnˈʃʊr/

unsure

inseguro
Meaning
not certain or confident; feeling doubt
Example
She felt unsure about the decision.
Ella se sentía insegura sobre la decisión.
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.
A1 interjection /ʌ/

uh

eh
Meaning
a sound people make when they hesitate or are unsure what to say next.
Example
Uh, I’m not sure if that’s the right answer.
Eh, no estoy seguro de si esa es la respuesta correcta.
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 /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.
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.
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.
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 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 /ʌnˈskeɪðd/

unscathed

ileso
Meaning
Without suffering any injury, damage, or harm.
Example
She escaped from the accident unscathed.
Ella escapó del accidente ilesa.
C2 adjective /ˌʌltrəˈmɒnteɪn/

ultramontane

partidario del Papa
Meaning
beyond the mountains, especially referring to support for the Pope over local church authority
Example
The debate highlighted the ultramontane position in church politics.
El debate destacó la posición ultramontana en la política eclesiástica.
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.
B1 adjective /juːˈniːk/

Unique

único; singular; raro
Meaning
being the only one of its kind; unlike anything else
Example
Every snowflake is unique in its pattern.
Cada copo de nieve es único en su patrón.
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.
C2 adjective /ʌnˈmɪtɪɡeɪtɪd/

unmitigated

completo
Meaning
absolute; not lessened or moderated
Example
The meeting was an unmitigated disaster.
La reunión fue un desastre completo.
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.
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.
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.
B2 adjective /ʌnˈiːzi/

Uneasy

inquieto; ansioso; incómodo
Meaning
worried; anxious; uncomfortable; restless
Example
She felt uneasy about walking alone at night.
Ella se sentía inquieta al caminar sola de noche.
B1 adjective /ʌnˈeɪ.bəl/

Unable

incapaz
Meaning
lacking the power, skill, or means to do something
Example
He was unable to attend the meeting.
Él no pudo asistir a la reunión.
C1 noun ˌʌndərˈprɪvəlɪdʒd ɡruːps

underprivileged groups

grupos desfavorecidos
Meaning
Groups of people who lack basic necessities or advantages that are available to other members of society.
Example
Underprivileged groups benefit from social initiatives.
Los grupos desfavorecidos se benefician de las iniciativas sociales.
C1 verb /ˌʌndərˈlaɪ/

underlie

subyacer
Meaning
to be the hidden cause or basis of something
Example
Strong cultural traditions underlie the community's practices.
Las fuertes tradiciones culturales subyacen a las prácticas de la comunidad.
C1 adjective /ʌnˈɜːrθli/

unearthly

sobrenatural
Meaning
Strange or unnatural in a way that seems not of this world
Example
The forest was filled with an unearthly glow.
El bosque estaba lleno de un resplandor sobrenatural.
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 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 /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.
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.
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 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.
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.
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.
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.
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.
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.
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 /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 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.
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 /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 /ˌʌnəbˈtruːsɪv/

unobtrusive

discreto
Meaning
not attracting attention; blending in without causing notice
Example
The security cameras are designed to be unobtrusive.
Las cámaras de seguridad están diseñadas para ser discretas.
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.
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 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 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.
B1 adjective /ʌnˈseɪf/

Unsafe

inseguro; peligroso;
Meaning
involving or causing danger or risk; not protected from harm
Example
It is unsafe to walk alone in this neighborhood at night.
Es inseguro caminar solo en este vecindario por la noche.
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 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.
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.
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.
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.
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.
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.
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.
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 /ˈʌpˌhɪl/

Uphill

difícil; que requiere gran esfuerzo; inclinado hacia arriba
Meaning
difficult; requiring great effort; sloping upward
Example
Learning a new language can be an uphill battle.
Aprender un nuevo idioma puede ser una batalla difícil.
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 /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.
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.
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.
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 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 /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.
C1 adjective /ˌjuːnɪˈsɛljʊlər/

unicellular

unicelular
Meaning
Consisting of a single cell.
Example
Amoebas are unicellular organisms.
Las amibas son organismos unicelulares.
C1 adjective /ˌʌnˈpɑr.də.nə.bəl/

Unpardonable

imperdonable
Meaning
too bad to be forgiven; inexcusable
Example
His betrayal of trust was an unpardonable offense.
Su traición fue un delito imperdonable.
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.
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.
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.
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.