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B2 adjective /ʌnˈlɪmɪtɪd/

unlimited

Meaning
without any limits or restrictions
Example
The internet plan offers unlimited data for the whole month.
B2 adjective /ˌʌnkənˈvɪnsɪŋ/

Unconvincing

Meaning
failing to persuade or impress; not believable or credible
Example
His excuse for being late was completely unconvincing.
C1 adjective /ˌʌnbɪˈkʌmɪŋ/

unbecoming

Meaning
Not proper or appropriate for a person; unsuitable.
Example
His rude behavior was unbecoming of a leader.
A2 adjective /ʌnˈlʌki/

Unlucky

Meaning
having bad luck; unfortunate
Example
He was unlucky to miss the winning shot.
B2 adverb /ˈʌt.ə.li/

Utterly

Meaning
completely; absolutely; totally
Example
The movie was utterly boring and I fell asleep.
B2 adverb /ʌnˈkɒnʃəsli/

unconsciously

Meaning
without being aware of one's actions or surroundings
Example
She unconsciously tapped her foot to the rhythm of the music.
B1 adjective /ˌʌnsəkˈsesfl/

Unsuccessful

Meaning
not achieving desired aims or results; failing to accomplish a purpose
Example
His unsuccessful attempt to climb the mountain left him disappointed.
B2 adjective /ʌnˈnætʃərəl/

Unnatural

Meaning
not existing in nature; artificial; forced
Example
The actor's smile looked unnatural and forced.
C1 adjective /ˌʌndərɪkˈspoʊzd/

underexposed

Meaning
insufficiently exposed to light (in photography) or not given enough attention
Example
The photo was underexposed and looked too dark.
C1 adjective /ˌjuːnɪˈlætərəl/

Unilateral

Meaning
one-sided; involving only one party
Example
The country made a unilateral decision to withdraw from the treaty.
C2 adjective /ˌʌnprəˈpɪʃəs/

unpropitious

Meaning
Not giving or indicating a good chance of success; unfavorable.
Example
The team began their journey under unpropitious weather conditions.
B2 noun /juːˈtɪl.ə.ti/

Utility

Meaning
the state of being useful, profitable, or beneficial; a public service
Example
The utility of solar panels increases with rising electricity costs.
C1 adjective /ˌʌnsəˈfɪstɪˌkeɪtɪd/

unsophisticated

Meaning
Lacking worldly experience, refinement, or complexity.
Example
The villagers led an unsophisticated but happy life.
B2 noun /ˈɜː.dʒən.si/

Urgency

Meaning
the quality of requiring immediate action or attention; pressing importance
Example
The urgency of the situation required immediate medical attention.
C2 adjective /ˈʌndjʊleɪtɪŋ/

undulating

Meaning
Having a smoothly rising and falling form or motion like waves.
Example
We drove through undulating hills.
B2 noun ˌɜːbənaɪˈzeɪʃən

urbanization

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.
C1 adjective /ʌnˈsoʊld/

unsold

Meaning
not sold; remaining without a buyer
Example
The unsold goods were returned to the warehouse.
C2 adjective /ʌnˈspɛərɪŋ/

unsparing

Meaning
Showing no mercy or generosity; harsh or severe.
Example
The critic was unsparing in his review of the play.
C1 adjective /ˌʌnfɔːrθˈkʌmɪŋ/

unforthcoming

Meaning
Not willing to talk or provide information; uncooperative.
Example
The witness was unforthcoming about what he had seen.
C2 noun juːˈbɪkwɪti

ubiquity

Meaning
The fact of appearing everywhere or of being very common.
Example
The ubiquity of smartphones has transformed communication.
B2 adjective /ʌnˈfɪt/

Unfit

Meaning
not in good physical condition; unsuitable or inappropriate
Example
He was declared unfit for military service due to his poor health.
C2 adjective /ˌʌnəˈʃʊəd/

unassured

Meaning
Lacking confidence or certainty.
Example
She gave an unassured answer during the interview.
C2 verb /ʌpˈbreɪd/

upbraid

Meaning
To scold or criticize someone harshly.
Example
The teacher upbraided the student for being late again.
C2 noun /ˈʌm.brə/

Umbra

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.
C2 adjective /ʌnˈmɪtɪɡeɪtɪd/

unmitigated

Meaning
absolute; not lessened or moderated
Example
The meeting was an unmitigated disaster.
B2 adjective /ʌnˈiːkwəl/

Unequal

Meaning
not the same in quantity, size, or value; not fair or just
Example
The distribution of wealth is unequal in many countries.
B2 adjective /ʌnˌkənˈdɪʃ.ən.əl/

Unconditional

Meaning
not subject to any conditions; complete and absolute
Example
She offered her unconditional support to her friend in need.
B2 adjective /ʌnˈbæləns/

Unbalanced

Meaning
not balanced; lacking stability or equilibrium; mentally unstable
Example
The unbalanced table kept wobbling.
B2 noun /ʌnˈrest/

Unrest

Meaning
a state of dissatisfaction and disturbance; social or political disorder
Example
The economic crisis led to widespread social unrest.
A2 adjective /ˈʌɡ.li/

Ugly

Meaning
unpleasant or repulsive in appearance; morally reprehensible
Example
The old building looked ugly after years of neglect.
B1 adjective /ʌnˈseɪf/

Unsafe

Meaning
involving or causing danger or risk; not protected from harm
Example
It is unsafe to walk alone in this neighborhood at night.
C1 verb /ʌnˈkɔrk/

uncork

Meaning
To remove the cork from a bottle; to open a bottle, especially of wine
Example
He uncorked the wine and poured a glass for everyone.
C1 adjective /ˌʌndərˈsteɪtɪd/

understated

Meaning
Presented in a subtle and restrained way.
Example
She wore an elegant but understated dress.
C1 adjective /ˌʌnəkˈnɒlɪdʒd/

unacknowledged

Meaning
Not recognized, admitted, or accepted; ignored or unnoticed
Example
Her contributions to the project went unacknowledged.
C2 verb /ʌnˈfrɒk/

unfrock

Meaning
To remove a priest from his position or deprive someone of a rank.
Example
The corrupt priest was unfrocked after the investigation.
B2 adjective /ˌʌnˈkɔːrdɪneɪtɪd/

uncoordinated

Meaning
lacking coordination, not well-organized or clumsy in movement
Example
His movements were uncoordinated, making him prone to accidents.
B2 noun /ʌnˈkaɪndnəs/

unkindness

Meaning
lack of kindness; cruel or inconsiderate behavior
Example
His unkindness hurt her feelings deeply.
C1 adjective /ʌnˈθɪŋkɪŋ/

unthinking

Meaning
done without careful thought; automatic or thoughtless
Example
His unthinking remark hurt her feelings.
C2 verb /ʌnˈkaʊtʃ/

uncouch

Meaning
to remove from a couch or to release from being laid down (rare/archaic usage)
Example
The surgeon attempted to uncouch the cataract.
C1 adjective /ʌnˈspiːkəbl/

unspeakable

Meaning
too bad or shocking to be expressed in words
Example
The survivors endured unspeakable horrors during the war.
B1 noun /juːˈten.səlz/

Utensils

Meaning
tools or implements used for cooking, eating, or serving food
Example
Please wash all the cooking utensils after preparing dinner.
A1 pronoun /ʌs/

us

Meaning
used to refer to the speaker and one or more other people as the object of a verb or preposition
Example
She gave us a gift.
C1 adjective /ˌjuːnɪˈsɛljʊlər/

unicellular

Meaning
Consisting of a single cell.
Example
Amoebas are unicellular organisms.
B1 verb /ʌnˈpæk/

unpack

Meaning
to remove items from a container; to explain or analyze something in detail
Example
After arriving home, she began to unpack her suitcase.
B2 adjective /ʌnˈiːzi/

Uneasy

Meaning
worried; anxious; uncomfortable; restless
Example
She felt uneasy about walking alone at night.
B2 verb ˈjuːnɪfaɪ

unify

Meaning
To make or become united, uniform, or whole; to bring together into a single unit.
Example
Adolescents unify with peers for social acceptance.
B2 adjective /ˌʌn.kəʊˈɒp.ər.ə.tɪv/

uncooperative

Meaning
not willing to help or work with others; unhelpful
Example
The witness was uncooperative and refused to answer questions.
B2 adjective /ˌʌnəˈweər/

Unaware

Meaning
not knowing or realizing; having no knowledge of something
Example
She was completely unaware of the danger.
B1 adjective /ʌnˈpɒpjʊlə/

unpopular

Meaning
not liked or supported by many people
Example
The decision was unpopular with the public.
C1 adjective /ˌʌnəbˈtruːsɪv/

unobtrusive

Meaning
not attracting attention; blending in without causing notice
Example
The security cameras are designed to be unobtrusive.
C2 verb /ˈʌndjʊleɪt/

undulate

Meaning
To move with a smooth, wave-like motion.
Example
The snake undulated across the sand.
C1 adjective /ˌʌnəˈteɪnəbl/

unattainable

Meaning
impossible to achieve, reach, or accomplish
Example
For many, becoming a professional athlete remains an unattainable dream.
C2 adjective /ˌʌnsɛrəˈmoʊniəs/

unceremonious

Meaning
Done without formality or courtesy; abrupt or rude.
Example
He made an unceremonious exit from the party.
B2 adjective ʌnˈprɛsɪˌdɛntɪd

unprecedented

Meaning
Never done or known before; without previous example.
Example
Unprecedented advancements in science changed human lives.
B2 adverb /ˈɜːrdʒəntli/

urgently

Meaning
in a way that requires immediate attention or action
Example
The patient urgently needs medical attention.
C1 adjective /ˌʌnfɔːrˈsiːn/

unforeseen

Meaning
Not anticipated or predicted; unexpected.
Example
The project faced unforeseen challenges that delayed its completion.
C1 adjective /ʌnˈkleɪmd/

Unclaimed

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.
C2 adjective ˌʌn.əˈseɪ.lə.bəl

unassailable

Meaning
Unable to be attacked, questioned, or defeated.
Example
An unassailable position ensures dominance.
B2 adverb /ʌnˈplɛzəntli/

unpleasantly

Meaning
in a way that causes discomfort, annoyance, or displeasure; in an unfriendly or disagreeable manner
Example
The room was unpleasantly hot during the afternoon.
C2 verb /ˈʌndərˌraɪt/

underwrite

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.
C2 adjective /ˌʌltrəˈmʌndeɪn/

ultramundane

Meaning
Relating to things beyond the physical world; supernatural or transcendental.
Example
Philosophers often discuss ultramundane realities beyond human perception.
B2 adjective /ˌʌnprɪˈdɪktəbəl/

unpredictable

Meaning
not able to be predicted; changing suddenly and unexpectedly
Example
The weather in this region is highly unpredictable.
C2 verb /juˈzɜrp/

usurp

Meaning
to take someone's position of power illegally or by force
Example
The general tried to usurp the king's throne.
B2 adjective /ʌn.rɪˈleɪ.tɪd/

Unrelated

Meaning
having no connection or relationship; not connected by family ties
Example
The two incidents were completely unrelated to each other.
C1 adjective /ʌnˈkwaɪ.ət/

Unquiet

Meaning
restless; unable to remain still or quiet; anxious or troubled
Example
She spent an unquiet night worrying about the exam results.
A1 interjection /ʌ/

uh

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.
B2 adjective /ˌʌnəˈvɔɪdəbəl/

Unavoidable

Meaning
cannot be avoided; certain to happen; inevitable
Example
The meeting is unavoidable, so we must attend.
B1 adjective /ʌnˈfrɛndli/

unfriendly

Meaning
not kind or welcoming; hostile or cold in behavior or attitude
Example
The shop owner seemed unfriendly to new customers.
B2 adjective /ˌjuːnɪˈvɜːrsəl/

Universal

Meaning
applicable to all cases; existing everywhere
Example
Music is a universal language that everyone understands.
C2 adjective /juːˈnɪsənənt/

unisonant

Meaning
Sounding together or in harmony.
Example
The unisonant voices created a powerful effect.
B2 adjective /ˌʌndɪˈzaɪərəbl/

Undesirable

Meaning
not wanted or wished for; harmful or unpleasant
Example
The new policy had several undesirable consequences.
C1 adjective /ʌnˈfɛtərd/

unfettered

Meaning
not restricted or confined; free
Example
The artist enjoyed unfettered freedom of expression.
C1 adjective /ʌnˈkʌltʃəd/

Uncultured

Meaning
lacking good manners, refinement, or education; uncivilized
Example
His uncultured behavior embarrassed everyone at the dinner party.
B2 adjective /ʌnprəˈfɛʃ.ən.əl/

Unprofessional

Meaning
not conforming to the standards expected in a particular profession
Example
His unprofessional behavior led to his dismissal from the company.
B2 adjective /ʌnˈɡreɪt.fəl/

Ungrateful

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.
B2 noun /ˈʌpˌkiːp/

up-keep

Meaning
The process or cost of maintaining something in good condition.
Example
The upkeep of the old house is very expensive.
A2 adjective /ʌnˈhæp.i/

Unhappy

Meaning
not happy; feeling sad or displeased; unfortunate or undesirable
Example
He was unhappy with the results of his exam.
B2 adverb /ʌnˈwɪlɪŋli/

unwillingly

Meaning
in a way that shows reluctance or lack of desire; not willingly
Example
She unwillingly agreed to attend the meeting.
A2 noun /ˈʌndərwɛr/

Under wear

Meaning
clothing worn under other clothes, next to the skin
Example
She bought new underwear from the department store.
C2 noun /ˌjuːzɜːrˈpeɪʃən/

usurpation

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.
B1 adjective /ʌnˈplɛz.ənt/

Unpleasant

Meaning
not giving or causing pleasure; disagreeable
Example
The medicine had an unpleasant taste.
C1 adjective /ˌʌn.əˈdʌl.tə.reɪ.tɪd/

Unadulterated

Meaning
not mixed or diluted with any different or extra elements; pure
Example
She felt unadulterated joy when she heard the news.
C1 noun /ˈjuːnɪsən/

unison

Meaning
Simultaneous performance or utterance of action or speech.
Example
The choir sang in unison.
C1 verb /ʌnˈrævəl/

unravel

Meaning
To undo twisted or knitted threads; to solve or explain something complicated.
Example
The detective worked hard to unravel the mystery.
A1 verb /ˌʌndərˈstænd/

understand

Meaning
to know the meaning of something; to comprehend
Example
Do you understand the instructions?
C1 adjective /ʌnˈtʌtʃəbəl/

Untouchable

Meaning
not able to be touched or affected; beyond criticism or attack
Example
The CEO seemed untouchable despite the scandal.
C1 verb /ˌʌn.dəˈtʃɑːrdʒ/

undercharge

Meaning
To charge less than the correct or fair amount.
Example
The shopkeeper accidentally undercharged me for the groceries.
C1 adjective /ʌnˈtoʊld/

Untold

Meaning
very great in amount or degree; countless; immeasurable
Example
The earthquake caused untold damage to the city.
B1 adjective /ʌnɪmˈplɔɪd/

Unemployed

Meaning
without a job; not having paid work
Example
He has been unemployed for six months now.
C1 noun /juːˈtoʊpiə/

utopia

Meaning
An imagined perfect society or place where everything is ideal.
Example
Many philosophers dreamed of creating a utopia for humanity.
B1 adjective /ˈʌpər/

upper

Meaning
higher in position or rank
Example
The upper floor of the building is under renovation.
B2 adjective /ʌnˈtʃeɪndʒɪŋ/

unchanging

Meaning
remaining the same over time; not changing
Example
Her love for her family was unchanging throughout the years.
C1 adjective /ˌʌnəˈkaʊntəbl/

unaccountable

Meaning
Not able to be explained or justified.
Example
She felt an unaccountable fear as she entered the dark room.
B2 adjective /ʌnəˈfreɪd/

unafraid

Meaning
Not feeling fear; brave or courageous
Example
She walked into the dark room, unafraid of what might be inside.
C2 adjective /ʌkˈsɔːriəs/

uxorious

Meaning
excessively fond of or submissive to one's wife
Example
He was so uxorious that he agreed with everything his wife said.
A2 noun /ˈjuːnɪt/

unit

Meaning
an individual thing or person regarded as a single and complete entity
Example
Each unit in the production line is carefully tested.
B1 adjective /ʌnˈkaʊntəbəl/

Uncountable

Meaning
too many to be counted; innumerable; infinite in quantity
Example
There are uncountable stars in the night sky.
B2 adjective /ʌnˈkɒmən/

uncommon

Meaning
rare, unusual, or remarkable
Example
It is uncommon to see snow in this region.
B2 adjective /ʌnˈwaɪz/

unwise

Meaning
Showing poor judgment; not sensible or prudent.
Example
It would be unwise to invest all your money in one company.
B1 adjective /ˈɜːrbən/

urban

Meaning
related to, characteristic of, or situated in a city or town
Example
Urban areas often have higher population density than rural areas.
C1 adjective /ʌnˈɡɑː.dɪd/

Unguarded

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.
C2 adjective /ʌnˈælɔɪd/

unalloyed

Meaning
Pure, complete, and not mixed with anything else.
Example
She felt unalloyed joy at the news of her success.
B1 verb /ʌnˈlɒk/

unlock

Meaning
to open something that is locked; to make something accessible or available
Example
She used the key to unlock the door.
B2 verb /ˌʌndərˈskɔːr/

underscore

Meaning
to emphasize or highlight something
Example
The incident underscored the need for better safety measures.
B1 adjective /ʌnˈklɪər/

unclear

Meaning
not easy to understand; vague or ambiguous
Example
The instructions were unclear, so I asked for clarification.
C2 adjective /ʌnˈsʌlid/

unsullied

Meaning
not spoiled or made impure; perfectly clean or pure
Example
His reputation remained unsullied despite the accusations.
C2 adjective /ʌpˈrɔːr.i.əs/

uproarious

Meaning
Extremely funny or noisy; causing loud laughter or commotion.
Example
The comedian's jokes were absolutely uproarious.
C1 adjective /ˌʌnˈpɑr.də.nə.bəl/

Unpardonable

Meaning
too bad to be forgiven; inexcusable
Example
His betrayal of trust was an unpardonable offense.
B1 adjective /ʌnˈjuː.ʒu.əl/

Unusual

Meaning
not typical; strange; different from what is normal
Example
She wore an unusual dress to the party.
C1 adjective /ʌnˈsɜːrvɪsəbəl/

Unserviceable

Meaning
not in working order; unable to be used; defective
Example
The old computer became unserviceable after the system crash.
C1 adjective + noun ʌnˈpresɪdentɪd ˈnɒlɪdʒ

unprecedented knowledge

Meaning
Information or understanding that has never been obtained or achieved before.
Example
Artemis will provide unprecedented knowledge about the solar system.
B1 adjective /ʌnˈtru/

Untrue

Meaning
not true; false; incorrect
Example
His statement about the incident was completely untrue.
C1 adjective /ˌʌnɪmˈplɔɪəbəl/

unemployable

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.
C1 noun ˈʌp.raɪ.zɪŋ

uprising

Meaning
An act of resistance or rebellion; a revolt against an authority or government.
Example
The uprising marked the beginning of the revolution.
B2 adjective /ˌʌnrɪˈlaɪəbl/

Unreliable

Meaning
not dependable; not able to be trusted or relied upon
Example
The old car is unreliable and breaks down frequently.
B2 verb /ʌnˈveɪl/

unveil

Meaning
to reveal or disclose something, especially in a formal manner
Example
The company will unveil a new product next week.
B1 adjective /ʌnˈʃʊr/

unsure

Meaning
not certain or confident; feeling doubt
Example
She felt unsure about the decision.
B1 adjective ʌnˈplænd

unplanned

Meaning
Not planned or arranged in advance; happening spontaneously without preparation.
Example
Unplanned urbanization contributes to environmental issues.
B1 noun /ˌʌnɪmˈplɔɪmənt/

Unemployment

Meaning
the state of being unemployed; lack of paid work
Example
The unemployment rate has increased significantly this year.
C2 adjective /ˈɜːrsaɪn/

ursine

Meaning
Relating to or resembling a bear.
Example
The man’s ursine strength amazed everyone.
C2 adjective /juːˈbɪkwɪtəs/

ubiquitious

Meaning
Present, appearing, or found everywhere.
Example
Smartphones have become ubiquitous in modern society.