univalence
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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 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.
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 /ʌnˈruːli/

Unruly

Meaning
difficult to control or manage; disorderly and disruptive
Example
The unruly crowd refused to follow the safety instructions.
B1 adjective /juːˈniːk/

Unique

Meaning
being the only one of its kind; unlike anything else
Example
Every snowflake is unique in its pattern.
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.
C2 noun /ˈjuːʒəri/

usury

Meaning
The practice of lending money at unreasonably high interest rates.
Example
The law strictly prohibits usury.
C1 adjective /ˌjuːnɪˈsɛljʊlər/

unicellular

Meaning
Consisting of a single cell.
Example
Amoebas are unicellular organisms.
A2 noun /ˈʌndərweər/

underwear

Meaning
Clothing worn beneath outer clothes, typically next to the skin.
Example
He bought new underwear for the trip.
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.
C1 adjective /ʌnˈθɪŋkɪŋ/

unthinking

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

urchin

Meaning
a mischievous or poorly dressed child, often from the streets
Example
The ragged urchins played by the riverbank.
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.
A1 adjective /juːzd/

used

Meaning
having already been used
Example
This is a used car.
B2 adjective /ˌjuːnɪˈvɜːrsəl/

Universal

Meaning
applicable to all cases; existing everywhere
Example
Music is a universal language that everyone understands.
C2 noun /ˈʌp.wel.ɪŋ/

upwelling

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.
C2 adjective /ʌnˈsʌlid/

unsullied

Meaning
not spoiled or made impure; perfectly clean or pure
Example
His reputation remained unsullied despite the accusations.
C1 adjective /ʌnˈfɔːltərɪŋ/

unfaltering

Meaning
Steady and resolute; not weakening or hesitating
Example
She continued with unfaltering determination.
C1 adjective /ʌnˈweɪ.vər.ɪŋ/

unwavering

Meaning
Steady or resolute; not wavering.
Example
He showed unwavering dedication to his goal.
C1 adjective ʌnˈtʃɑːtɪd

uncharted

Meaning
Not mapped or surveyed; unknown or unexplored.
Example
The mission aimed to explore uncharted areas of the planet.
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.
B2 adjective /ʌnˈlɪmɪtɪd/

unlimited

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

Unavoidable

Meaning
cannot be avoided; certain to happen; inevitable
Example
The meeting is unavoidable, so we must attend.
B2 adjective /ˌʌnprɪˈdɪktəbəl/

unpredictable

Meaning
not able to be predicted; changing suddenly and unexpectedly
Example
The weather in this region is highly unpredictable.
B1 adjective /ʌnˈnoʊn/

Unknown

Meaning
not known or identified; unfamiliar
Example
The author of this letter remains unknown.
C1 adjective /ʌnˈɒnəd/

unhonoured

Meaning
not respected or given the recognition that is deserved; treated without honor
Example
He felt unhonoured after his years of service were ignored.
C1 noun /ˌʌnriˈælɪti/

unreality

Meaning
the state or quality of being unreal; lack of reality or truth
Example
The dreamlike setting gave the story a sense of unreality.
B1 adjective /ˈʌpər/

upper

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

Unwell

Meaning
not in good health; feeling sick or ill
Example
She has been feeling unwell since yesterday.
B2 verb /ˌʌndərˈskɔːr/

underscore

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

Unfortunately

Meaning
used to express regret or disappointment about something
Example
Unfortunately, the weather was bad for our picnic.
C1 adjective /ˌʌnəˈteɪnəbl/

unattainable

Meaning
impossible to achieve, reach, or accomplish
Example
For many, becoming a professional athlete remains an unattainable dream.
A2 noun /ˈjuːzər/

user

Meaning
a person who uses or operates something
Example
He is a frequent user of this app.
B2 adjective /ʌnˈtʃeɪndʒɪŋ/

unchanging

Meaning
remaining the same over time; not changing
Example
Her love for her family was unchanging throughout the years.
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.
C2 adjective /ʌnˈɡeɪnli/

ungainly

Meaning
Awkward, clumsy, or lacking grace in movement or appearance.
Example
The tall boy moved in an ungainly manner.
C2 adjective /ɜːrˈbeɪn/

urbane

Meaning
showing polished manners, refinement, and sophistication
Example
He was an urbane gentleman who charmed everyone at the party.
B2 adjective /ʌnˈberəbəl/

Unbearable

Meaning
too painful, annoying, or unpleasant to tolerate; impossible to endure
Example
The heat in the desert was unbearable.
C2 adjective /ˌʌnɪmˈpiːtʃəbl/

unimpeachable

Meaning
Not able to be doubted, questioned, or criticized; completely trustworthy.
Example
She is known for her unimpeachable honesty.
B1 verb /juˈnaɪt/

unite

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

unwitting

Meaning
Not aware of what is happening; done without realizing.
Example
She became an unwitting participant in the scam.
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.
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 adjective /ʌnˈsteɪtɪd/

unstated

Meaning
not expressed directly in words; implied or left unsaid
Example
The contract included several unstated expectations.
C2 adjective /juːˈʒʊəriəs/

usurious

Meaning
Charging excessively high interest rates on loans.
Example
The bank was accused of offering loans at usurious rates.
A2 noun /ˈʌndərwɛr/

Under wear

Meaning
clothing worn under other clothes, next to the skin
Example
She bought new underwear from the department store.
C1 adjective /ʌnˈtaɪərɪŋ/

Untiring

Meaning
continuing without stopping; persistent; tireless
Example
Her untiring efforts finally led to success.
C1 noun /juːnəˈnɪməti/

Unanimity

Meaning
complete agreement among all members of a group
Example
The committee reached unanimity on the new policy.
B2 adverb /ˈɜːrdʒəntli/

urgently

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

unsteady

Meaning
not firm or stable; likely to change or fail
Example
She felt unsteady on her feet after the long journey.
B1 adjective /ˈjuːnɪfɔːrm/

Uniform

Meaning
consistent; identical; standardized
Example
All students must wear a uniform to school.
B2 adjective /ʌnˈdʒʌst/

Unjust

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

uncanny

Meaning
Strange or mysterious, especially in an unsettling way.
Example
She has an uncanny ability to predict the future.
B2 adjective ʌnˈprɛsɪˌdɛntɪd

unprecedented

Meaning
Never done or known before; without previous example.
Example
Unprecedented advancements in science changed human lives.
C2 adjective /ˌʌnəˈʃʊəd/

unassured

Meaning
Lacking confidence or certainty.
Example
She gave an unassured answer during the interview.
C1 adjective /ʌnˈʃeɪkən/

Unshaken

Meaning
not disturbed or affected; firm and steady; unwavering
Example
Her faith remained unshaken despite all the challenges.
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 noun ˈjuːnəti

unity

Meaning
The state of being united or joined as a whole.
Example
Unity among people led to victory.
B2 verb /ˌʌndərˈmaɪn/

undermine

Meaning
to gradually weaken or damage something or someone
Example
Constant criticism can undermine a child's confidence.
B2 adjective /ʌnˈsteɪbəl/

Unstable

Meaning
likely to change; not steady or secure; unsteady
Example
The unstable economy made people worried about their jobs.
C2 verb /ˈʌndərˌmæn/

underman

Meaning
to supply with fewer workers or personnel than needed
Example
The hospital was undermanned during the flu outbreak.
B2 adjective /juːˈnæn.ɪ.məs/

Unanimous

Meaning
fully in agreement; shared by all
Example
The committee reached a unanimous decision.
A2 noun /ˌʌndərˈstændɪŋ/

understanding

Meaning
the ability to grasp the meaning, significance, or nature of something
Example
Her understanding of the issue was impressive.
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.
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.
C1 adjective /ʌnˈsaɪtli/

unsightly

Meaning
Unpleasant to look at; ugly.
Example
The garbage pile created an unsightly view in the park.
B1 adjective /ʌnˈjuzd/

Unused

Meaning
not being used; not having been used before
Example
There are many unused rooms in this old mansion.
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.
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.
B2 adjective /ʌnˈkwɒl.ɪ.faɪd/

Unqualified

Meaning
not having the necessary skills or qualifications; complete or absolute
Example
He was unqualified for the engineering position due to lack of experience.
B2 adjective /ʌnˈrɪəl/

unreal

Meaning
not real or not based on reality; exaggerated or imaginary
Example
The experience felt unreal after the sudden news.
C1 adjective ʌnˈwɔːr.rən.tɪd

unwarranted

Meaning
Not justified or necessary; without good reason.
Example
His anger toward the staff was completely unwarranted.
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.
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.
C1 adjective /ˈʌndərhænd/

underhand

Meaning
done secretly and dishonestly; deceitful
Example
The politician was accused of using underhand tactics to win the election.
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.əˈseɪ.lə.bəl

unassailable

Meaning
Unable to be attacked, questioned, or defeated.
Example
An unassailable position ensures dominance.
C1 adjective /ʌnˈɜːrθli/

unearthly

Meaning
Strange or unnatural in a way that seems not of this world
Example
The forest was filled with an unearthly glow.
C1 adjective /ˌʌnsəˈfɪstɪˌkeɪtɪd/

unsophisticated

Meaning
Lacking worldly experience, refinement, or complexity.
Example
The villagers led an unsophisticated but happy life.
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 adjective /ˌʌndərˈlaɪɪŋ/

underlying

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

unassuming

Meaning
Not pretentious or arrogant; modest.
Example
Despite his success, he remained unassuming and humble.
C2 noun /ˌjuːnɪˈtɛəriən/

unitarian

Meaning
A person who believes that God exists as one entity rather than as a Trinity; a member of a religious denomination that emphasizes individual freedom of belief.
Example
The Unitarian church is known for its inclusive and open-minded approach.
C1 adjective /ʌnˈspiːkəbl/

unspeakable

Meaning
too bad or shocking to be expressed in words
Example
The survivors endured unspeakable horrors during the war.
C1 adjective /ʌnˈskeɪðd/

unscathed

Meaning
Without suffering any injury, damage, or harm.
Example
She escaped from the accident unscathed.
B2 noun /ʌnˈrest/

Unrest

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

underhanded

Meaning
acting or done in a dishonest or secret way
Example
They exposed the company's underhanded dealings with its suppliers.
C1 verb /ʌnˈnɜːrv/

unnerve

Meaning
to make someone lose confidence, courage, or composure
Example
The hostile questions began to unnerve the witness.
A2 adjective /ˈjuːʒəl/

usual

Meaning
habitually or typically occurring or done
Example
It’s our usual meeting spot.
B2 adjective /ʌnˈkɒmən/

uncommon

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

Unheard

Meaning
not heard or listened to; not given a hearing; unknown or unfamiliar
Example
His complaints went unheard by the management.
B2 adjective /ˈjuː.nɪ.faɪd/

unified

Meaning
Made into a whole or joined together.
Example
A unified approach fosters better outcomes.
C2 adjective /ʌnˈtɛmpərd/

untempered

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

unimportance

Meaning
the state or quality of being insignificant or not important
Example
He dismissed the issue with a sense of unimportance.
B2 verb /ˌʌndərˈɛstɪmeɪt/

underestimate

Meaning
To judge something as less important or smaller than it really is.
Example
Never underestimate the power of teamwork.
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.
B2 adjective /ʌnˈkɒn.ʃəs/

Unconscious

Meaning
not awake and aware of one's surroundings; done or existing without one realizing
Example
The patient was unconscious for several hours after the surgery.
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.
B1 preposition, adverb, adjective /ˌʌndərˈniːθ/

underneath

Meaning
Located directly below or beneath something
Example
The keys were hidden underneath the pile of papers.
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.
B1 adjective /ʌnɪmˈplɔɪd/

Unemployed

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

unaccountable

Meaning
Not able to be explained or justified.
Example
She felt an unaccountable fear as she entered the dark room.
C1 adjective /ʌnˈtaɪmli/

Untimely

Meaning
happening at an inappropriate or inconvenient time; premature
Example
His untimely death at the age of thirty shocked everyone.
C2 adjective /ˈʌndjʊləs/

undulous

Meaning
Having a wavy surface or form.
Example
The artist painted the undulous sea at sunset.
B2 adjective /ʌnˈɪndʒərd/

uninjured

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

Unseen

Meaning
not previously seen or noticed; invisible; hidden
Example
The unseen forces of nature can be very powerful.
B2 adjective /ʌnfəˈmɪl.jər/

Unfamiliar

Meaning
not known or recognized; strange
Example
The city was unfamiliar to me since I had never been there before.
C2 noun /ˈʌŋkʃən/

unction

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.
C2 adjective /ʌpˈrɔːr.i.əs/

uproarious

Meaning
Extremely funny or noisy; causing loud laughter or commotion.
Example
The comedian's jokes were absolutely uproarious.
C2 adjective /ʌnˈflɛdʒd/

unfledged

Meaning
Inexperienced, immature, or not fully developed.
Example
The unfledged writer struggled to complete his first novel.
C2 verb /ʌpˈbreɪd/

upbraid

Meaning
To scold or criticize someone harshly.
Example
The teacher upbraided the student for being late again.
B2 noun /ʌnˈkaɪndnəs/

unkindness

Meaning
lack of kindness; cruel or inconsiderate behavior
Example
His unkindness hurt her feelings deeply.
B2 adjective /ˌʌndɪˈsaɪdɪd/

Undecided

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