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A1 verb /juːz/

use

Meaning
to employ something for a purpose; to take advantage of
Example
I use my computer for work and entertainment.
B1 adjective /ʌnˈedjʊkeɪtɪd/

Uneducated

Meaning
lacking education; not having received formal schooling or training
Example
Many uneducated workers struggle to find well-paying jobs.
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.
B2 adjective /ʌnˈiːvən/

Uneven

Meaning
not level or smooth; not regular or consistent
Example
The road was uneven and full of potholes.
B2 adjective /ʌnˈdʒʌst/

Unjust

Meaning
not fair or right; morally wrong
Example
The punishment was unjust for such a minor offense.
C1 adjective /ʌnˈmaɪndfəl/

Unmindful

Meaning
not paying attention; careless; heedless
Example
She was unmindful of the danger around her.
B1 adjective /ˈʌpˌkʌmɪŋ/

upcoming

Meaning
about to happen or appear
Example
The upcoming event will be held next week.
B1 adjective /ʌnˈnesəseri/

Unnecessary

Meaning
not needed; not required; pointless
Example
The meeting was unnecessary since all decisions were already made.
B2 adjective /ʌnˈsiːn/

Unseen

Meaning
not previously seen or noticed; invisible; hidden
Example
The unseen forces of nature can be very powerful.
C1 adjective /ˌʌnrɪˈfaɪnd/

unrefined

Meaning
not processed or purified; lacking polish or sophistication
Example
The unrefined oil must be processed before it can be used as fuel.
C1 noun /ʌnɪmˈpɔːrtəns/

unimportance

Meaning
the state or quality of being insignificant or not important
Example
He dismissed the issue with a sense of unimportance.
C2 verb /ʌnˈɑːrm/

unarm

Meaning
to remove weapons from someone or to deprive of means of attack or defense
Example
The soldiers were ordered to unarm the prisoners.
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 noun /ˈʌlsər/

ulcer

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.
B2 adjective /ʌnˈbæləns/

Unbalanced

Meaning
not balanced; lacking stability or equilibrium; mentally unstable
Example
The unbalanced table kept wobbling.
C1 noun ˌʌndərˈprɪvəlɪdʒd ɡruːps

underprivileged groups

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.
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 /ʌnˈkɒnʃəsnəs/

unconsciousness

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.
B2 verb /ʌnˈfəʊld/

unfold

Meaning
to open or spread out something that was folded; to gradually reveal or develop
Example
She unfolded the letter carefully.
B1 verb /juˈnaɪt/

unite

Meaning
to join together or combine; to bring people or things together
Example
The crisis helped unite the community.
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.
C1 adjective /ʌnˈtʃælɪndʒd/

Unchallenged

Meaning
not disputed or questioned; accepted without opposition; having no rival
Example
He remained the unchallenged champion for five years.
C2 verb /ˌʌndərˈɡɜːrd/

undergird

Meaning
to provide support or foundation for; to strengthen
Example
Strong values undergird a healthy society.
A1 adverb /ʌp/

up

Meaning
towards a higher position or level
Example
He climbed up the ladder quickly.
C1 verb /ˌʌndərˈsteɪt/

understate

Meaning
To describe something as being less important or serious than it really is.
Example
He tends to understate his achievements.
C2 adjective /ˌʌn.rɪˈdʒɛn.ər.ət/

unregenerate

Meaning
Not reformed or showing no signs of change; stubbornly refusing to reform or repent.
Example
He remained an unregenerate opponent of progress.
B2 adjective /ʌnˈkɒmən/

uncommon

Meaning
rare, unusual, or remarkable
Example
It is uncommon to see snow in this region.
C2 adjective /ʌnˈstɪntɪŋ/

unstinting

Meaning
given generously without holding back
Example
She received unstinting support from her family.
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.
B1 adjective /ˌʌnbɪˈliːvəbəl/

Unbelievable

Meaning
impossible to believe; extremely surprising or remarkable
Example
The magician's performance was absolutely unbelievable.
A2 adjective /ʌnˈlʌki/

Unlucky

Meaning
having bad luck; unfortunate
Example
He was unlucky to miss the winning shot.
C1 adjective /ʌnˈkɒm.prə.maɪ.zɪŋ/

Uncompromising

Meaning
unwilling to change one's views or to agree about something; showing an unwillingness to make concessions to others
Example
He was uncompromising in his demand for a full apology.
A2 noun /ˈjuːzər/

user

Meaning
a person who uses or operates something
Example
He is a frequent user of this app.
C2 adjective /juːˈbɪkwɪtəs/

ubiquitious

Meaning
Present, appearing, or found everywhere.
Example
Smartphones have become ubiquitous in modern society.
B2 adjective /ʌnˈwɪl.ɪŋ/

Unwilling

Meaning
not ready to do something; reluctant; not wanting to do
Example
He was unwilling to share his secret with anyone.
C1 adjective /ˈʌpərˌmoʊst/

uppermost

Meaning
situated at the highest place or most important
Example
Her family's safety was uppermost in her mind during the crisis.
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.
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.
C1 adjective /ʌnˈsiːmli/

unseemly

Meaning
Not proper or appropriate in behavior or appearance; unbecoming.
Example
His unseemly remarks embarrassed everyone at the dinner table.
B2 adjective /ʌnˈbiːtən/

Unbeaten

Meaning
not defeated; having never lost; undefeated
Example
The team remains unbeaten this season.
C1 adjective /ʌnˈkwes.tʃən.ə.bl̩/

Unquestionable

Meaning
not able to be disputed or doubted; certain and beyond doubt
Example
Her honesty and integrity are unquestionable qualities.
C1 adjective ʌnˈmætʃt

unmatched

Meaning
Not equaled or rivaled by any other; without equal.
Example
The freedom fighters showed unmatched bravery.
C1 adjective /ʌnˈseɪvəri/

unsavory

Meaning
Disagreeable, unpleasant, or morally offensive.
Example
The politician was linked to an unsavory scandal.
B2 adjective /ˈʌt.moʊst/

Utmost

Meaning
greatest; most extreme; maximum possible
Example
She showed utmost care while handling the fragile items.
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.
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 /ˌʌnəˈfɪʃ.əl/

Unofficial

Meaning
not officially authorized or confirmed; informal
Example
The unofficial results showed a close race.
B2 adjective /ʌnˈθɪŋkəbl/

Unthinkable

Meaning
impossible to conceive or imagine; beyond belief or consideration
Example
It was unthinkable that such a tragedy could happen in our peaceful town.
B1 adjective /juːˈnaɪtɪd/

United

Meaning
joined together for a common purpose; in agreement
Example
The team was united in their goal to win.
B2 adjective /ʌnˈlɪmɪtɪd/

unlimited

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

Undesirable

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

Unconstitutional

Meaning
not in accordance with a political constitution; violating constitutional principles
Example
The court declared the new law unconstitutional.
B2 adjective /ʌnˈendɪŋ/

Unending

Meaning
continuing forever; without end
Example
The unending rain made the day feel gloomy.
C2 adjective /juːˈnɪsənənt/

unisonant

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

Unsuitable

Meaning
not fitting or appropriate for a particular purpose or situation
Example
This formal dress is unsuitable for a casual beach party.
B1 adjective /ʌnˈwɒn.tɪd/

Unwanted

Meaning
not desired or welcome; not wanted
Example
He felt like an unwanted guest at the meeting.
B2 adjective /ʌnˈfeɪv(ə)rəbəl/

unfavorable

Meaning
not beneficial or advantageous; showing disapproval or opposition
Example
The proposal received an unfavorable response from the committee.
C2 adjective /ˌʌnsɛrəˈmoʊniəs/

unceremonious

Meaning
Done without formality or courtesy; abrupt or rude.
Example
He made an unceremonious exit from the party.
C1 adjective /ˌʌnbɪˈliːvɪŋ/

unbelieving

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.
C1 adjective ʌnˈskruːpjʊləs

unscrupulous

Meaning
Having or showing no moral principles; not honest or fair.
Example
Unscrupulous peers can lead adolescents to delinquency.
B2 adjective /ʌnˈskɪld/

Unskilled

Meaning
lacking technical training or ability; not requiring special skills
Example
Many unskilled workers are looking for training opportunities.
B2 adjective /ʌnˈwel.kəm/

Unwelcome

Meaning
not wanted or accepted; not invited or pleasant
Example
The unwelcome news ruined their vacation plans.
C2 adverb /ʌnˈɜːrɪŋli/

unerringly

Meaning
Without making any mistakes; always accurate
Example
The archer aimed unerringly at the target.
B1 adjective /ˌʌnˈɪntrəstɪŋ/

uninteresting

Meaning
not holding attention or curiosity; boring
Example
The lecture was uninteresting and difficult to stay focused on.
B1 adjective /ʌnˈeɪ.bəl/

Unable

Meaning
lacking the power, skill, or means to do something
Example
He was unable to attend the meeting.
B2 adjective /ˌʌndərˈlaɪɪŋ/

underlying

Meaning
basic or hidden but important; forming the foundation of something
Example
The underlying reason for the conflict was never addressed.
C1 verb /ʌnˈmɑːsk/

unmask

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.
B2 adjective /ʌnˈɪndʒərd/

uninjured

Meaning
Without injury; not physically harmed.
Example
All the passengers were rescued uninjured.
C1 adjective /ˌʌnɪnˈhɪbɪtɪd/

uninhibited

Meaning
Not restrained or restricted; free in behavior or expression.
Example
She gave an uninhibited laugh at the joke.
A2 adjective /ˈʌɡ.li/

Ugly

Meaning
unpleasant or repulsive in appearance; morally reprehensible
Example
The old building looked ugly after years of neglect.
C2 adjective /ʌnˈwiːldi/

unwieldy

Meaning
Difficult to carry or move because of its size, shape, or weight.
Example
The box was too unwieldy to carry up the stairs.
C1 adjective /ˌʌnrɪˈkwaɪtɪd/

unrequited

Meaning
Not returned or reciprocated, especially in the context of love or affection.
Example
He suffered from unrequited love for years.
C1 adjective /ʌnˈθɪŋkɪŋ/

unthinking

Meaning
done without careful thought; automatic or thoughtless
Example
His unthinking remark hurt her feelings.
C1 noun /ʌnkənˈsɜːrn/

Unconcern

Meaning
lack of worry or interest; indifference
Example
She showed complete unconcern about the criticism.
B2 adjective /ˌʌnəˈveɪləbəl/

unavailable

Meaning
Not able to be obtained, reached, or used; not present or accessible.
Example
The manager was unavailable to take calls during the meeting.
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 noun /ˈʌmbrɪdʒ/

umbrage

Meaning
A feeling of resentment or offense.
Example
She took umbrage at his rude remark.
B2 noun /ˌʌnəˌveɪləˈbɪləti/

unavailability

Meaning
The state of being not available or not accessible.
Example
The unavailability of the manager caused a delay in the project.
B1 adjective ʌnˈplænd

unplanned

Meaning
Not planned or arranged in advance; happening spontaneously without preparation.
Example
Unplanned urbanization contributes to environmental issues.
C1 adverb /ˌʌnkənˈvɛnʃənəli/

unconventionally

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.
C1 adjective /ʌlˈtɪəriər/

ulterior

Meaning
hidden or secret, often with a selfish motive
Example
He invited her with an ulterior motive.
B2 noun /ʌnəˈbɪləti/

unability

Meaning
the state of being unable to do something; incapacity
Example
His unability to solve the problem caused delays in the project.
C1 adjective /ˌʌnbɪˈkʌmɪŋ/

unbecoming

Meaning
Not proper or appropriate for a person; unsuitable.
Example
His rude behavior was unbecoming of a leader.
B1 adjective /ʌnˈʃʊr/

unsure

Meaning
not certain or confident; feeling doubt
Example
She felt unsure about the decision.
B2 adjective /ʌnˈhɜːrt/

unhurt

Meaning
Not injured or harmed.
Example
She walked away from the accident unhurt.
B2 adjective /ˌʌndɪˈsaɪdɪd/

Undecided

Meaning
not having made a decision; uncertain
Example
She was undecided about which college to attend.
B2 adjective /ʌnhaɪˈdʒiːnɪk/

Unhygienic

Meaning
not clean; lacking proper sanitation
Example
The restaurant was closed due to unhygienic conditions in the kitchen.
C1 adjective /ʌnˈvaɪəbl/

unviable

Meaning
Not capable of working successfully; not feasible or practical.
Example
The project was deemed unviable due to high costs.
B2 adjective /ˌʌnkənˈvɪnsɪŋ/

Unconvincing

Meaning
failing to persuade or impress; not believable or credible
Example
His excuse for being late was completely unconvincing.
B2 adjective /ˌʌnəˈweər/

Unaware

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

unwise

Meaning
Showing poor judgment; not sensible or prudent.
Example
It would be unwise to invest all your money in one company.
C2 noun/verb /ˈʌpˌkæst/

upcast

Meaning
Verb: To cast or throw upward. Noun: Something thrown or directed upward.
Example
The fisherman upcast his net into the air.
B2 adjective /ˌʌnɪnˈfɔːrmd/

uninformed

Meaning
lacking knowledge or awareness about a particular subject; not educated or informed
Example
The decision was made by an uninformed committee.
C2 adjective /ˌʌn.təˈwɔːrd/

untoward

Meaning
Unexpected and inappropriate or inconvenient.
Example
The meeting ended without any untoward incidents.
B1 adjective /ˈjuːnɪfɔːrm/

Uniform

Meaning
consistent; identical; standardized
Example
All students must wear a uniform to school.
B2 adjective /ˌʌn.əkˈsep.tə.bəl/

Unacceptable

Meaning
not satisfactory or allowable; not acceptable
Example
The quality of work was completely unacceptable.
B1 preposition, adverb, adjective /ˌʌndərˈniːθ/

underneath

Meaning
Located directly below or beneath something
Example
The keys were hidden underneath the pile of papers.
C2 adjective /ʌnˈflæpəbəl/

unflappable

Meaning
calm and composed, especially in difficult situations
Example
Despite the crisis, he remained unflappable and confident.
C2 verb /ˈʌndjʊleɪt/

undulate

Meaning
To move with a smooth, wave-like motion.
Example
The snake undulated across the sand.
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.
C2 verb /ʌnˈkloʊð/

unclothe

Meaning
to remove clothing from someone or something
Example
The nurse helped unclothe the patient for the examination.
B2 adjective /ˈʌpˌraɪt/

Upright

Meaning
honest and morally correct; vertical or erect in position
Example
She is known for being an upright and honest businesswoman.
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.
B1 adjective /ʌnˈmærid/

unmarried

Meaning
Not married; single.
Example
He is thirty-five and still unmarried.
C1 noun /ˈʌndərˌteɪkər/

undertaker

Meaning
A person whose job is to prepare the dead for burial and arrange funerals.
Example
The undertaker prepared the body for the funeral service.
C1 adverb /ʌnˈnætʃrəli/

unnaturally

Meaning
in a way that is not natural or normal; excessively or strangely
Example
He smiled unnaturally, making everyone feel uncomfortable.
C2 noun /ˈjuːnɪvəˌlɛns/

univalence

Meaning
The state of having a single valence or combining power, especially in chemistry.
Example
Hydrogen is characterized by its univalence in chemical reactions.
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.
B1 adjective /ʌnˈfɔːr.tʃən.ət/

Unfortunate

Meaning
having bad luck; regrettable or unlucky
Example
It was unfortunate that the meeting was cancelled at the last minute.
C2 adjective /ˌʌltrəˈmʌndeɪn/

ultramundane

Meaning
Relating to things beyond the physical world; supernatural or transcendental.
Example
Philosophers often discuss ultramundane realities beyond human perception.
C1 adjective /ˌʌnsəˈfɪstɪˌkeɪtɪd/

unsophisticated

Meaning
Lacking worldly experience, refinement, or complexity.
Example
The villagers led an unsophisticated but happy life.
B2 verb /ʌnˈtaɪ/

untie

Meaning
to loosen or remove a knot or binding; to release something that is tied
Example
She untied the rope to free the boat.
B2 adjective /ʌnˈsteɪbəl/

Unstable

Meaning
likely to change; not steady or secure; unsteady
Example
The unstable economy made people worried about their jobs.
A2 adjective /ʌnˈhel.θi/

Unhealthy

Meaning
harmful to health; not in good health; detrimental to well-being
Example
Eating too much fast food is unhealthy for your body.
C1 adjective /ˌʌnɪˈkwɪvəkəl/

unequivocal

Meaning
Leaving no doubt; clear and unambiguous
Example
She gave an unequivocal answer to the question.
A1 verb /ˌʌndərˈstænd/

understand

Meaning
to know the meaning of something; to comprehend
Example
Do you understand the instructions?
C2 adjective /juːˈʒʊəriəs/

usurious

Meaning
Charging excessively high interest rates on loans.
Example
The bank was accused of offering loans at usurious rates.
C1 noun /ˈʌp.tɜːn/

upturn

Meaning
An improvement or upward trend in a situation, especially in business or economy.
Example
The company experienced an upturn in sales last quarter.
B2 adjective /ʌnˈtʃeɪndʒəbəl/

Unchangeable

Meaning
not able to be changed or altered; fixed and permanent
Example
The laws of physics are unchangeable principles that govern the universe.
B2 adverb /ˈʌltəmətli/

ultimately

Meaning
in the end, after everything else
Example
Ultimately, we decided to go ahead with the project.