unaccountable
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C1 adjective /ˌʌnəˈkaʊntəbl/

unaccountable

Meaning
Not able to be explained or justified.
Example
She felt an unaccountable fear as she entered the dark room.
C2 adjective /ˌʌnɪkˈsɛpʃənəbl/

unexceptionable

Meaning
Not open to objection; acceptable and unobjectionable
Example
His behavior was unexceptionable throughout the event.
B2 verb /ʌpˈhoʊld/

uphold

Meaning
to maintain or support a principle, law, or decision
Example
The judge promised to uphold justice at all costs.
C1 adjective /ʌnˈsaɪtli/

unsightly

Meaning
Unpleasant to look at; ugly.
Example
The garbage pile created an unsightly view in the park.
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.
B2 adjective /ʌnˈendɪŋ/

Unending

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

unremitting

Meaning
Never relaxing or stopping; persistent.
Example
Her unremitting efforts finally paid off.
C2 verb /ʌnˈjoʊk/

unyoke

Meaning
To release from a yoke or to free from restraint or obligation.
Example
The farmer unyoked the oxen after a long day of work.
C1 adjective /ʌnˈbraɪdld/

unbridled

Meaning
Uncontrolled and unrestrained.
Example
The protesters showed unbridled enthusiasm for change.
C1 adjective /ʌnˈhoʊli/

Unholy

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

Uncountable

Meaning
too many to be counted; innumerable; infinite in quantity
Example
There are uncountable stars in the night sky.
C2 adjective /ʌnəˈpiːzd/

unappeased

Meaning
Not satisfied or calmed; still feeling discontent or anger
Example
Despite the apology, she remained unappeased.
C1 adjective ʌnɪnˈhæbɪtəbəl

uninhabitable

Meaning
Not suitable or safe for people to live in.
Example
Rapid urbanization can make cities uninhabitable.
C2 adjective /ʌnˈstɪntɪŋ/

unstinting

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

Unable

Meaning
lacking the power, skill, or means to do something
Example
He was unable to attend the meeting.
C1 adjective /ʌnˈmɒdɪfaɪd/

unmodified

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

unreal

Meaning
not real or not based on reality; exaggerated or imaginary
Example
The experience felt unreal after the sudden news.
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 adjective /ˌʌnəˈʃʊəd/

unassured

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

untrammeled

Meaning
Not restricted or hampered; free and unrestricted.
Example
She enjoyed untrammeled freedom in her new life abroad.
B2 verb /ˌʌndərˈɛstɪmeɪt/

underestimate

Meaning
To judge something as less important or smaller than it really is.
Example
Never underestimate the power of teamwork.
A2 adjective /ˈjuːs.ləs/

Useless

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

Unlawful

Meaning
not authorized by law; illegal
Example
The court declared the search unlawful.
B2 adjective /ʌnˈbiːtən/

Unbeaten

Meaning
not defeated; having never lost; undefeated
Example
The team remains unbeaten this season.
B2 adjective /ˌʌndɪˈstɜːrbd/

Undisturbed

Meaning
not interrupted or interfered with; calm and peaceful
Example
She slept undisturbed for eight hours.
C2 adjective /ʌnˈtɛmpərd/

untempered

Meaning
not moderated or softened; lacking proper balance or control
Example
The untempered anger of the crowd caused chaos.
C2 noun /ʌnˈkloʊðɪŋ/

unclothing

Meaning
the act or process of removing clothing
Example
The child quickly ran inside for unclothing after playing in the mud.
B2 adjective /ʌnhaɪˈdʒiːnɪk/

Unhygienic

Meaning
not clean; lacking proper sanitation
Example
The restaurant was closed due to unhygienic conditions in the kitchen.
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.
B2 adjective /ˌʌnkənˈtroʊld/

uncontrolled

Meaning
not restrained or managed; lacking control
Example
The wildfire spread in an uncontrolled manner, causing widespread damage.
C2 verb /ˈʌndjʊleɪt/

undulate

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

uninhibited

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

ultramundane

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

unsullied

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

unkindness

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

Utter

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

Uncivilized

Meaning
not developed in terms of civilization; lacking social organization and culture; barbarous
Example
The explorers encountered an uncivilized tribe deep in the Amazon rainforest.
C1 adjective /ʌnˈsteɪtɪd/

unstated

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

unmarried

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

unearth

Meaning
To dig up from the ground or to discover something hidden.
Example
Archaeologists unearthed ancient artifacts at the site.
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.
C1 adjective ʌnˈskruːpjʊləs

unscrupulous

Meaning
Having or showing no moral principles; not honest or fair.
Example
Unscrupulous peers can lead adolescents to delinquency.
C2 noun /ɜːrˈbænɪti/

urbanity

Meaning
refined courtesy, elegance, and sophistication in manner
Example
Her urbanity made her popular among diplomats and leaders.
B1 adjective /ʌnˈwel/

Unwell

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

unreadable

Meaning
not able to be read or understood clearly; illegible
Example
The doctor’s handwriting was completely unreadable.
B2 adjective /ʌnˈsiːn/

Unseen

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

uncertainly

Meaning
in a way that shows doubt or lack of certainty
Example
She glanced uncertainly at the complicated instructions.
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.
B1 adjective /ˌʌnɪkˈspektɪd/

Unexpected

Meaning
not expected or anticipated; surprising
Example
The unexpected news left everyone speechless.
B2 verb /ˈjuːtɪlaɪz/

utilize

Meaning
to make practical or effective use of something
Example
The company aims to utilize solar energy for production.
B2 adjective /ʌnˈfeɪ.vər.ə.bəl/

Unfavourable

Meaning
not helpful or advantageous; adverse
Example
The weather conditions were unfavourable for our outdoor event.
A2 verb /ʌpˈdeɪt/

update

Meaning
to make something more modern or current; to provide new information
Example
Please update your software regularly.
C2 adjective /ˌʌnsɛrəˈmoʊniəs/

unceremonious

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

unforeseen

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

Untold

Meaning
very great in amount or degree; countless; immeasurable
Example
The earthquake caused untold damage to the city.
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 /ʌnˌkənˈdɪʃ.ən.əl/

Unconditional

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

unattainable

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

usury

Meaning
The practice of lending money at unreasonably high interest rates.
Example
The law strictly prohibits usury.
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.
B2 noun /ˈʌndərˌteɪkɪŋ/

undertaking

Meaning
A task, project, or responsibility that someone agrees to do.
Example
Starting a new company is a difficult undertaking.
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 /ʌpˈrɔːr.i.əs/

uproarious

Meaning
Extremely funny or noisy; causing loud laughter or commotion.
Example
The comedian's jokes were absolutely uproarious.
C1 verb /ˌʌndərˈvæljuː/

undervalue

Meaning
To assign too low a value or importance to something or someone.
Example
She felt that her boss consistently undervalued her contributions.
B1 adjective /ʌnɪmˈplɔɪd/

Unemployed

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

uproot

Meaning
To pull something out of the ground; to remove or displace completely.
Example
They uprooted the old tree from the garden.
B1 adjective /ʌnˈkʊkt/

uncooked

Meaning
Not cooked; in a raw state.
Example
Eating uncooked meat can be dangerous.
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.
B1 adjective /ˌʌnbɪˈliːvəbəl/

Unbelievable

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

Unpleasant

Meaning
not giving or causing pleasure; disagreeable
Example
The medicine had an unpleasant taste.
C2 adjective /ˌʌn.təˈwɔːrd/

untoward

Meaning
Unexpected and inappropriate or inconvenient.
Example
The meeting ended without any untoward incidents.
B2 adjective /ˌʌnrɪˈzɒlvd/

unresolved

Meaning
not solved or settled; remaining undecided or unclear
Example
The dispute remains unresolved despite several meetings.
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.
C2 verb /ˌʌndərˈɡɜːrd/

undergird

Meaning
to provide support or foundation for; to strengthen
Example
Strong values undergird a healthy society.
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.
C1 verb /ˌʌndərˈlaɪ/

underlie

Meaning
to be the hidden cause or basis of something
Example
Strong cultural traditions underlie the community's practices.
C1 adjective /ʌnˈweɪ.vər.ɪŋ/

unwavering

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

unbecoming

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

unthinking

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

unfetter

Meaning
to release from restraint or restriction; to free
Example
The new law will unfetter small businesses from excessive regulations.
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 adverb /ʌnˈɜːrɪŋli/

unerringly

Meaning
Without making any mistakes; always accurate
Example
The archer aimed unerringly at the target.
B2 adverb /ʌnˈnesəserəli/

Unnecessarily

Meaning
to a greater extent than is needed; without necessity
Example
Don't worry unnecessarily about the exam.
C1 adjective /ˌʌnəbˈtruːsɪv/

unobtrusive

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

unassuaged

Meaning
Not made less intense or relieved; unrelieved.
Example
His grief remained unassuaged despite the passage of time.
B2 adverb juːˈnæn.ɪ.məs.li

unanimously

Meaning
With the agreement of all people involved; without opposition.
Example
The proposal was unanimously accepted.
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 /ʌnˈhɜːrt/

unhurt

Meaning
Not injured or harmed.
Example
She walked away from the accident unhurt.
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.
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.
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.
B1 adjective /ʌnˈwɒn.tɪd/

Unwanted

Meaning
not desired or welcome; not wanted
Example
He felt like an unwanted guest at the meeting.
C2 adjective /ʌnˈlɛtəd/

unlettered

Meaning
lacking education or the ability to read and write; illiterate
Example
The unlettered villagers relied on oral traditions to preserve their history.
B2 adjective /ʌnˈbæləns/

Unbalanced

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

Undaunted

Meaning
not intimidated or discouraged by difficulty, danger, or disappointment
Example
Despite the setbacks, she remained undaunted in pursuing her goals.
B2 adjective /ˌʌnɪnˈtenʃənəl/

Unintentional

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

unafraid

Meaning
Not feeling fear; brave or courageous
Example
She walked into the dark room, unafraid of what might be inside.
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.
A1 adjective /ˈjuːs.fəl/

Useful

Meaning
having a beneficial purpose; practical
Example
This tool is very useful for fixing problems.
A1 preposition/conjunction /ʌnˈtɪl/

until

Meaning
up to the time of
Example
I will wait until you come back.
B1 verb /ˈʌpˌɡreɪd/

upgrade

Meaning
to raise something to a higher standard, improve
Example
We decided to upgrade the software to the latest version.
B1 adjective /ʌnˈnoʊn/

Unknown

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

unsavory

Meaning
Disagreeable, unpleasant, or morally offensive.
Example
The politician was linked to an unsavory scandal.