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B1 adjective /ʌnˈnoʊn/

Unknown

Meaning
not known or identified; unfamiliar
Example
The author of this letter remains unknown.
C1 verb /ˌʌn.dəˈtʃɑːrdʒ/

undercharge

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

unseemly

Meaning
Not proper or appropriate in behavior or appearance; unbecoming.
Example
His unseemly remarks embarrassed everyone at the dinner table.
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.
C2 noun juːˈbɪkwɪti

ubiquity

Meaning
The fact of appearing everywhere or of being very common.
Example
The ubiquity of smartphones has transformed communication.
C2 noun /ɜːrˈbænɪti/

urbanity

Meaning
refined courtesy, elegance, and sophistication in manner
Example
Her urbanity made her popular among diplomats and leaders.
B2 adjective /ʌnˈwɜːrði/

Unworthy

Meaning
not deserving respect or attention; lacking worth or merit
Example
He felt unworthy of such praise and recognition.
C1 adjective /ˌʌnəˈkaʊntəbl/

unaccountable

Meaning
Not able to be explained or justified.
Example
She felt an unaccountable fear as she entered the dark room.
B1 adjective /ʌnˈfeər/

Unfair

Meaning
not right or just; treating people in a way that favors some over others
Example
It's unfair to blame her for something she didn't do.
C1 adjective ʌnˈjiːl.dɪŋ

unyielding

Meaning
Not easily broken or giving in to pressure.
Example
Her unyielding determination helped her overcome all challenges.
B2 adjective /ˌʌnɪˈmædʒənəbəl/

Unimaginable

Meaning
impossible to conceive; beyond imagination
Example
The scale of destruction was unimaginable until we saw it firsthand.
C1 adjective /ˌʌnbɪˈkʌmɪŋ/

unbecoming

Meaning
Not proper or appropriate for a person; unsuitable.
Example
His rude behavior was unbecoming of a leader.
C1 adjective /ʌnˈdɔːntɪd/

Undaunted

Meaning
not intimidated or discouraged by difficulty, danger, or disappointment
Example
Despite the setbacks, she remained undaunted in pursuing her goals.
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.
B1 adjective /ʌnˈedjʊkeɪtɪd/

Uneducated

Meaning
lacking education; not having received formal schooling or training
Example
Many uneducated workers struggle to find well-paying jobs.
B1 adjective /ˌʌnɪmˈpɔːrtənt/

unimportant

Meaning
not having much value, significance, or influence
Example
The detail seemed unimportant compared to the main issue.
C1 noun /ˌʌnprɪˈdɪktəˌbɪləti/

unpredictability

Meaning
The quality of being impossible to predict or anticipate.
Example
The unpredictability of the weather made the trip uncertain.
B1 adjective /ˈjuːnɪfɔːrm/

Uniform

Meaning
consistent; identical; standardized
Example
All students must wear a uniform to school.
C2 verb /ʌpˈbreɪd/

upbraid

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

unguent

Meaning
A soothing or healing ointment applied to the skin.
Example
The doctor applied an unguent to heal the burn.
B2 adjective /ʌnprɪˈpɛrd/

Unprepared

Meaning
not ready or able to deal with something
Example
He was unprepared for the difficult exam.
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.
B2 adjective /ʌnˈberəbəl/

Unbearable

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

Unwell

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

Unnoticed

Meaning
not seen or observed; ignored
Example
His hard work went unnoticed by his manager.
C1 adjective /ˌʌnəˈteɪnəbl/

unattainable

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

underlie

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

Upright

Meaning
honest and morally correct; vertical or erect in position
Example
She is known for being an upright and honest businesswoman.
C2 adjective /ʌnˈflɛdʒd/

unfledged

Meaning
Inexperienced, immature, or not fully developed.
Example
The unfledged writer struggled to complete his first novel.
C1 adjective /ˌʌndərˈsteɪtɪd/

understated

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

unfaithfulness

Meaning
the quality of being disloyal or not faithful; breach of trust or fidelity
Example
His unfaithfulness led to the end of their marriage.
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 /ˌʌnbɪˈliːvəbəl/

Unbelievable

Meaning
impossible to believe; extremely surprising or remarkable
Example
The magician's performance was absolutely unbelievable.
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.
B1 adjective ʌnˈplænd

unplanned

Meaning
Not planned or arranged in advance; happening spontaneously without preparation.
Example
Unplanned urbanization contributes to environmental issues.
A2 adjective /ˈjuːs.ləs/

Useless

Meaning
having no beneficial purpose; not useful
Example
This broken computer is completely useless.
B2 adjective /ʌnˈhɛlpfəl/

unhelpful

Meaning
not providing help or support; making a situation harder rather than easier
Example
His unhelpful attitude slowed down the entire project.
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.
C1 adjective /juːˈbɪkwɪtəs/

ubiquitous

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

unacknowledged

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

unsold

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

Unholy

Meaning
wicked; sinful; profane
Example
The unholy alliance between the two companies caused public outrage.
C2 adjective /ʌnˈtʃeɪst/

Unchaste

Meaning
not celibate; having engaged in sexual relations; lacking moral purity
Example
The conservative society considered her behavior unchaste and improper.
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.
B2 adjective /ˌʌnɪnˈtenʃənəl/

Unintentional

Meaning
not done on purpose; accidental
Example
The damage to the car was unintentional.
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.
B2 adjective /ʌnˈlɪmɪtɪd/

unlimited

Meaning
without any limits or restrictions
Example
The internet plan offers unlimited data for the whole month.
C2 noun /juːˈkeɪs/

ukase

Meaning
An authoritative decree or order, especially one issued by a sovereign or government.
Example
The czar issued a ukase restricting the freedom of the press.
B2 adjective /ˈjuː.nɪ.faɪd/

unified

Meaning
Made into a whole or joined together.
Example
A unified approach fosters better outcomes.
B2 adjective /ʌnˈfeɪθ.fəl/

Unfaithful

Meaning
not loyal or true to a spouse, partner, or commitment
Example
He was unfaithful to his wife for many years.
A2 noun /ˌʌndərˈstændɪŋ/

understanding

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

unsociable

Meaning
not enjoying the company of others; avoiding social interaction
Example
He became unsociable after moving to a new city.
C1 adjective /ʌnˈsɪvəl/

Uncivil

Meaning
not polite or courteous; rude and discourteous in behavior
Example
His uncivil remarks during the meeting offended everyone present.
B2 adjective /ˌjuːnɪˈvɜːrsəl/

Universal

Meaning
applicable to all cases; existing everywhere
Example
Music is a universal language that everyone understands.
B1 adjective /ˈʌpər/

upper

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

Unconfirmed

Meaning
not confirmed as true or definite; not verified or substantiated
Example
The report remains unconfirmed until we receive official verification.
C1 adjective ʌnˈskruːpjʊləs

unscrupulous

Meaning
Having or showing no moral principles; not honest or fair.
Example
Unscrupulous peers can lead adolescents to delinquency.
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.
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 /juːˈnæn.ɪ.məs/

Unanimous

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

upset

Meaning
to make someone worried, sad, or angry; to disturb
Example
The bad news upset everyone.
A2 adjective /ʌnˈlʌki/

Unlucky

Meaning
having bad luck; unfortunate
Example
He was unlucky to miss the winning shot.
B2 adjective /ʌnˈɑːrmd/

unarmed

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

unwrap

Meaning
remove wrapping or covering from something; reveal something gradually or clearly
Example
She carefully unwrapped the gift with excitement.
A2 noun /ˈʌndərwɛr/

Under wear

Meaning
clothing worn under other clothes, next to the skin
Example
She bought new underwear from the department store.
A2 conjunction /ʌnˈlɛs/

unless

Meaning
except if
Example
We won't go unless it stops raining.
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 adverb /ˈʌltəmətli/

ultimately

Meaning
in the end, after everything else
Example
Ultimately, we decided to go ahead with the project.
C1 adjective /ʌnˈtoʊld/

Untold

Meaning
very great in amount or degree; countless; immeasurable
Example
The earthquake caused untold damage to the city.
B2 adjective /ˈʌt.ɚ/

Utter

Meaning
complete; absolute; total
Example
The movie was an utter disaster at the box office.
C1 verb /ˌʌndəˈreɪt/

underrate

Meaning
to fail to recognize the full value or importance of something or someone
Example
Many people underrate the benefits of regular exercise.
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.
C1 noun /ˌʌnbɪˈliːf/

Unbelief

Meaning
lack of religious belief; skepticism or doubt
Example
His unbelief in the supernatural made him a skeptic.
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.
C2 verb /ʌnˈkloʊð/

unclothe

Meaning
to remove clothing from someone or something
Example
The nurse helped unclothe the patient for the examination.
C1 adjective /ʌnˈsɜːrvɪsəbəl/

Unserviceable

Meaning
not in working order; unable to be used; defective
Example
The old computer became unserviceable after the system crash.
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.
B2 adverb /ʌnˈfɛərli/

unfairly

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

unhurt

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

uphold

Meaning
to maintain or support a principle, law, or decision
Example
The judge promised to uphold justice at all costs.
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.
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 verb /ʌnˈnɜːrv/

unnerve

Meaning
to make someone lose confidence, courage, or composure
Example
The hostile questions began to unnerve the witness.
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 ˌʌn.pəˈtɜːbd

unperturbed

Meaning
Not worried or disturbed by something; calm and composed.
Example
She remained unperturbed despite the challenges.
B2 adverb /ʌnˈnesəserəli/

Unnecessarily

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

Unhygienic

Meaning
not clean; lacking proper sanitation
Example
The restaurant was closed due to unhygienic conditions in the kitchen.
C2 adjective /ʌnˈɡeɪnli/

ungainly

Meaning
Awkward, clumsy, or lacking grace in movement or appearance.
Example
The tall boy moved in an ungainly manner.
B2 verb /ˌʌndərˈmaɪn/

undermine

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

understudy

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.
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.
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.
C2 adverb /ʌnˈɜːrɪŋli/

unerringly

Meaning
Without making any mistakes; always accurate
Example
The archer aimed unerringly at the target.
B2 adjective /ˈʌt.moʊst/

Utmost

Meaning
greatest; most extreme; maximum possible
Example
She showed utmost care while handling the fragile items.
B1 adjective /ʌnˈwɒn.tɪd/

Unwanted

Meaning
not desired or welcome; not wanted
Example
He felt like an unwanted guest at the meeting.
B1 adjective /ʌnˈʃʊr/

unsure

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

unprecedented

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

untempered

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

unaffected

Meaning
Not influenced or touched by something; genuine and natural.
Example
He remained unaffected by the criticism and kept working hard.
B1 adjective /ʌnˈtru/

Untrue

Meaning
not true; false; incorrect
Example
His statement about the incident was completely untrue.
C2 adjective /ʌnˈʌtərəbl/

unutterable

Meaning
Too great, intense, or awful to be expressed or described in words.
Example
She was filled with unutterable joy at the news of her success.
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 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.
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.