undertake
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B2 verb /ˌʌndərˈteɪk/

undertake

Meaning
to commit to and begin a task or project; to take on responsibility
Example
She decided to undertake a challenging project.
C1 adjective /ˌʌnɪnˈhɪbɪtɪd/

uninhibited

Meaning
Not restrained or restricted; free in behavior or expression.
Example
She gave an uninhibited laugh at the joke.
B1 adjective /ˈɜːrdʒənt/

Urgent

Meaning
requiring immediate action or attention; pressing
Example
The patient needs urgent medical attention.
A1 noun /ˈʌŋkəl/

uncle

Meaning
the brother of one's father or mother
Example
My uncle is visiting us next week.
B1 adverb /ʌnˈjuːʒuəli/

unusually

Meaning
in a way that is not typical or expected; to an uncommon degree
Example
It was unusually cold for this time of year.
B1 adjective /ʌnˈnesəseri/

Unnecessary

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

Unofficial

Meaning
not officially authorized or confirmed; informal
Example
The unofficial results showed a close race.
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.
C1 adjective /ʌnˈsoʊld/

unsold

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

unappeased

Meaning
Not satisfied or calmed; still feeling discontent or anger
Example
Despite the apology, she remained unappeased.
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 adjective /ʌnˈɑːrmd/

unarmed

Meaning
Not equipped with or carrying weapons
Example
The police found the suspect unarmed during the search.
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 /ˌʌnˈɪntɪmeɪtɪŋ/

unintimating

Meaning
Not giving a hint or suggestion; not indicating.
Example
His unintimating tone gave no clue of his true feelings.
B1 adjective /ˌʌnɪmˈpɔːrtənt/

unimportant

Meaning
not having much value, significance, or influence
Example
The detail seemed unimportant compared to the main issue.
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 noun /ʌnˈhæp.i.nəs/

unhappiness

Meaning
the state of being unhappy; sadness or dissatisfaction
Example
Her constant unhappiness affected everyone around her.
B2 adjective /ˌʌnkənˈvɪnsɪŋ/

Unconvincing

Meaning
failing to persuade or impress; not believable or credible
Example
His excuse for being late was completely unconvincing.
A1 adverb /ˈjuː.ʒu.ə.li/

Usually

Meaning
in most cases; generally; as a rule
Example
I usually wake up at 7 AM every morning.
C2 adjective /juːˈbɪkwɪtəs/

ubiquitious

Meaning
Present, appearing, or found everywhere.
Example
Smartphones have become ubiquitous in modern society.
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.
A2 noun /ˈʌndərwɛr/

Under wear

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

Unholy

Meaning
wicked; sinful; profane
Example
The unholy alliance between the two companies caused public outrage.
C1 adjective /ʌnˈskeɪðd/

unscathed

Meaning
Without suffering any injury, damage, or harm.
Example
She escaped from the accident unscathed.
A1 verb /juːz/

use

Meaning
to employ something for a purpose; to take advantage of
Example
I use my computer for work and entertainment.
C2 noun /juːˌtɪlɪˈtɛəriənɪzəm/

utilitarianism

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.
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 noun /ˈɜːrtʃɪn/

urchin

Meaning
a mischievous or poorly dressed child, often from the streets
Example
The ragged urchins played by the riverbank.
B2 adverb /ʌnˈnesəserəli/

Unnecessarily

Meaning
to a greater extent than is needed; without necessity
Example
Don't worry unnecessarily about the exam.
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.
B2 adjective /ˌʌnkənˈvɛnʃənl/

unconventional

Meaning
not based on or conforming to what is generally done or believed
Example
Her unconventional approach to teaching inspired her students to think creatively.
C1 adjective /ʌnˈkɛmpt/

unkempt

Meaning
Having an untidy or disheveled appearance.
Example
He looked unkempt after sleeping outdoors all night.
C1 noun /ˈʌp.ʃɒt/

Upshot

Meaning
the final result or outcome of a series of events; conclusion
Example
The upshot of the meeting was a decision to postpone the project.
B2 adjective /ʌnˈsteɪbəl/

Unstable

Meaning
likely to change; not steady or secure; unsteady
Example
The unstable economy made people worried about their jobs.
B2 adjective ʌnˈprɛsɪˌdɛntɪd

unprecedented

Meaning
Never done or known before; without previous example.
Example
Unprecedented advancements in science changed human lives.
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.
C1 adjective /ˌʌndərˈsteɪtɪd/

understated

Meaning
Presented in a subtle and restrained way.
Example
She wore an elegant but understated dress.
C2 adjective /ˈʌndjʊləs/

undulous

Meaning
Having a wavy surface or form.
Example
The artist painted the undulous sea at sunset.
B1 adjective /ˈjuːnɪfɔːrm/

Uniform

Meaning
consistent; identical; standardized
Example
All students must wear a uniform to school.
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.
C1 noun /ˌʌl.tɪˈmeɪ.təm/

Ultimatum

Meaning
a final demand or statement of terms, the rejection of which will result in retaliation
Example
The boss gave him an ultimatum: improve or be fired.
C2 noun /ˈjuːzjuːfrʌkt/

usufruct

Meaning
The legal right to use and enjoy the benefits of someone else’s property without owning it.
Example
The tenant had the usufruct of the land but not its ownership.
B1 noun /ˈjuːnjən/

Union

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.
B2 adjective /ʌnˈraɪp/

Unripe

Meaning
not fully developed or matured; not ready to be eaten
Example
The unripe bananas will turn yellow in a few days.
C2 adjective /ˌʌn.təˈwɔːrd/

untoward

Meaning
Unexpected and inappropriate or inconvenient.
Example
The meeting ended without any untoward incidents.
A2 adjective /ʌnˈkʌmf.tə.bəl/

Uncomfortable

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.
B1 adverb /ˌʌpsaɪd ˈdaʊn/

Upside-down

Meaning
with the upper part at the bottom; in or into a reversed position
Example
The picture was hanging upside-down on the wall.
C1 adjective /ʌnˈbraɪdld/

unbridled

Meaning
Uncontrolled and unrestrained.
Example
The protesters showed unbridled enthusiasm for change.
C2 noun juːˈbɪkwɪti

ubiquity

Meaning
The fact of appearing everywhere or of being very common.
Example
The ubiquity of smartphones has transformed communication.
A1 noun /ˌjuːnɪˈvɜːrsɪti/

university

Meaning
an institution of higher education and research, which grants academic degrees
Example
She is studying law at the university.
C2 verb /ʌpˈhiːv/

upheave

Meaning
to lift or raise something forcefully; to cause to rise suddenly
Example
The workers had to upheave the heavy stone to clear the path.
C1 noun /ʌpˈhiːvəl/

upheaval

Meaning
a violent or sudden change or disruption to something
Example
The company faced a major upheaval after the sudden resignation of its CEO.
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.
B2 adverb /ˈɜːrdʒəntli/

urgently

Meaning
in a way that requires immediate attention or action
Example
The patient urgently needs medical attention.
B1 adjective /ˈʌpˌkʌmɪŋ/

upcoming

Meaning
about to happen or appear
Example
The upcoming event will be held next week.
C1 adjective /ˌʌnəˈteɪnəbl/

unattainable

Meaning
impossible to achieve, reach, or accomplish
Example
For many, becoming a professional athlete remains an unattainable dream.
C1 adjective /ʌnˈkuːθ/

uncouth

Meaning
Lacking good manners, refinement, or grace; awkward or rough.
Example
His uncouth behavior shocked the guests at the party.
B1 adjective /ʌnˈedjʊkeɪtɪd/

Uneducated

Meaning
lacking education; not having received formal schooling or training
Example
Many uneducated workers struggle to find well-paying jobs.
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.
C1 verb /ˌʌndərˈlaɪ/

underlie

Meaning
to be the hidden cause or basis of something
Example
Strong cultural traditions underlie the community's practices.
C2 adjective /ʌnˈtɛmpərd/

untempered

Meaning
not moderated or softened; lacking proper balance or control
Example
The untempered anger of the crowd caused chaos.
C1 adjective /ʌnˈvaɪəbl/

unviable

Meaning
Not capable of working successfully; not feasible or practical.
Example
The project was deemed unviable due to high costs.
C2 adjective /ʌnˈtiːtʃəbəl/

unteachable

Meaning
not able or willing to learn; resistant to instruction or guidance
Example
He was so stubborn that he became almost unteachable.
C2 noun /ˈʌndərlɪŋ/

underling

Meaning
a person of low rank or importance; a subordinate
Example
The manager ordered his underlings to finish the task quickly.
B2 adverb /ʌnˈfɛərli/

unfairly

Meaning
In a manner that is not just, reasonable, or impartial
Example
He was treated unfairly by the committee.
B2 noun /ʌnˈrest/

Unrest

Meaning
a state of dissatisfaction and disturbance; social or political disorder
Example
The economic crisis led to widespread social unrest.
B1 adjective /ʌnˈjuː.ʒu.əl/

Unusual

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

unmodified

Meaning
not changed from its original form or state
Example
The data was used in its unmodified form for analysis.
C1 noun /ˌjuːnɪˈfɔːrməti/

Uniformity

Meaning
the quality of being uniform; consistency or sameness
Example
The uniformity of the design created a pleasing visual effect.
B2 adverb /ʌnˈdaʊtɪdli/

undoubtedly

Meaning
without a doubt, certainly
Example
He is undoubtedly the best player on the team.
C1 adjective /ˌʌndərˈhændɪd/

underhanded

Meaning
acting or done in a dishonest or secret way
Example
They exposed the company's underhanded dealings with its suppliers.
C2 verb /ˈʌndjʊleɪt/

undulate

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

unwavering

Meaning
Steady or resolute; not wavering.
Example
He showed unwavering dedication to his goal.
B2 adjective /ʌnprɪˈpɛrd/

Unprepared

Meaning
not ready or able to deal with something
Example
He was unprepared for the difficult exam.
C2 adjective /ʌnˈmɪtɪɡeɪtɪd/

unmitigated

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

Undesirable

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

unspeakable

Meaning
too bad or shocking to be expressed in words
Example
The survivors endured unspeakable horrors during the war.
A2 preposition /əˈpɒn/

upon

Meaning
on or immediately after
Example
Upon hearing the news, he rushed to the hospital.
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.
B1 adjective /ʌnˈʃʊr/

unsure

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

Unworthy

Meaning
not deserving respect or attention; lacking worth or merit
Example
He felt unworthy of such praise and recognition.
C2 adjective /ʌnˈɡeɪnli/

ungainly

Meaning
Awkward, clumsy, or lacking grace in movement or appearance.
Example
The tall boy moved in an ungainly manner.
B2 adjective /ˌʌn.əkˈsep.tə.bəl/

Unacceptable

Meaning
not satisfactory or allowable; not acceptable
Example
The quality of work was completely unacceptable.
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.
A1 adjective /ˈjuːs.fəl/

Useful

Meaning
having a beneficial purpose; practical
Example
This tool is very useful for fixing problems.
C2 verb /ʌnˈkloʊð/

unclothe

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

Unbalanced

Meaning
not balanced; lacking stability or equilibrium; mentally unstable
Example
The unbalanced table kept wobbling.
C2 adjective /ɜːrˈbeɪn/

urbane

Meaning
showing polished manners, refinement, and sophistication
Example
He was an urbane gentleman who charmed everyone at the party.
C1 noun /ˈʌp.rɔːr/

Uproar

Meaning
a loud and emotional noise or disturbance; public outcry
Example
The announcement caused an uproar among the students.
B2 adjective /ˈʌpˌhɪl/

Uphill

Meaning
difficult; requiring great effort; sloping upward
Example
Learning a new language can be an uphill battle.
C2 noun /ˈʌmbrɪdʒ/

umbrage

Meaning
A feeling of resentment or offense.
Example
She took umbrage at his rude remark.
C1 adjective /ˌʌnəbˈtruːsɪv/

unobtrusive

Meaning
not attracting attention; blending in without causing notice
Example
The security cameras are designed to be unobtrusive.
B2 adjective /ˌʌnˈkɔːrdɪneɪtɪd/

uncoordinated

Meaning
lacking coordination, not well-organized or clumsy in movement
Example
His movements were uncoordinated, making him prone to accidents.
C2 adjective /ˌʌnəˈsweɪdʒd/

unassuaged

Meaning
Not made less intense or relieved; unrelieved.
Example
His grief remained unassuaged despite the passage of time.
C2 noun /ˈʌn.dɚˌstɔː.ri/

understory

Meaning
The layer of vegetation beneath the main canopy of a forest.
Example
The understory of a rainforest is home to small mammals and insects.
B2 adjective /ˌʌnrɪˈzɒlvd/

unresolved

Meaning
not solved or settled; remaining undecided or unclear
Example
The dispute remains unresolved despite several meetings.
B2 adjective /ʌnˈbiːtən/

Unbeaten

Meaning
not defeated; having never lost; undefeated
Example
The team remains unbeaten this season.
C1 adjective /juːˈbɪkwɪtəs/

ubiquitous

Meaning
Existing or being everywhere at the same time.
Example
Social media has become ubiquitous among young people.
C1 adjective /ʌnˈsəʊʃəl/

unsocial

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.
C1 adjective /ˌʌnəkˈnɒlɪdʒd/

unacknowledged

Meaning
Not recognized, admitted, or accepted; ignored or unnoticed
Example
Her contributions to the project went unacknowledged.
C1 adjective /ʌnˈtɛnəbl/

untenable

Meaning
not able to be maintained or defended against attack or objection
Example
The politician resigned when his position became untenable.
B2 adjective /ʌnˈriːdəbl/

unreadable

Meaning
not able to be read or understood clearly; illegible
Example
The doctor’s handwriting was completely unreadable.
C1 adjective /ˌʌnəˈfɛktɪd/

unaffected

Meaning
Not influenced or touched by something; genuine and natural.
Example
He remained unaffected by the criticism and kept working hard.
B2 adjective /ʌnˈnætʃərəl/

Unnatural

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

underhand

Meaning
done secretly and dishonestly; deceitful
Example
The politician was accused of using underhand tactics to win the election.
C1 verb /ˈʌndərkʌt/

undercut

Meaning
to sell at a lower price than a competitor; to weaken or undermine something
Example
The company tried to undercut its rivals by offering lower prices.
B2 noun /ˈʌndərkləʊðz/

underclothes

Meaning
Clothing worn beneath outer clothes, such as underwear or lingerie
Example
He folded his underclothes neatly before packing them.
A2 noun /ˈjuːzər/

user

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

unctuous

Meaning
Excessively flattering or ingratiating; oily in texture.
Example
His unctuous tone made everyone uncomfortable.
A2 noun /ʌmˈbrɛlə/

umbrella

Meaning
A device used for protection against rain or sun, typically consisting of a collapsible canopy mounted on a central rod.
Example
She opened her umbrella as it started to rain.
A2 adjective /ʌnˈtaɪdi/

Untidy

Meaning
not neat or orderly; messy and disorganized
Example
Her untidy room was filled with clothes scattered everywhere.
B2 adjective /ʌnˈriːzənəbəl/

unreasonable

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.
B2 adjective /ʌnˈfeɪ.vər.ə.bəl/

Unfavourable

Meaning
not helpful or advantageous; adverse
Example
The weather conditions were unfavourable for our outdoor event.
C1 adjective /ʌnˈmaɪndfəl/

Unmindful

Meaning
not paying attention; careless; heedless
Example
She was unmindful of the danger around her.
C2 verb /ˈʌndərˌmæn/

underman

Meaning
to supply with fewer workers or personnel than needed
Example
The hospital was undermanned during the flu outbreak.
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 adjective /ʌnˈdʒʌst/

Unjust

Meaning
not fair or right; morally wrong
Example
The punishment was unjust for such a minor offense.
A2 noun /ˌʌpˈsteəz/

Upstairs

Meaning
on or to an upper floor of a building; the upper floor or floors
Example
She went upstairs to her bedroom to rest.