unsparing
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C2 adjective /ʌnˈspɛərɪŋ/

unsparing

Meaning
Showing no mercy or generosity; harsh or severe.
Example
The critic was unsparing in his review of the play.
C1 noun /ˈʌndərˌwɜːrld/

underworld

Meaning
The criminal world of organized crime or the mythical world of the dead.
Example
The detective spent years studying the secrets of the underworld.
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.
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 /ʌnˈbaɪəst/

unbiased

Meaning
Not showing prejudice; impartial and fair.
Example
The report gave an unbiased view of the situation.
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.
C1 adjective /ˌʌnˈɪntɪmeɪtɪŋ/

unintimating

Meaning
Not giving a hint or suggestion; not indicating.
Example
His unintimating tone gave no clue of his true feelings.
B2 adjective /ʌnˈdʒʌst/

Unjust

Meaning
not fair or right; morally wrong
Example
The punishment was unjust for such a minor offense.
B2 adjective /ʌnprɪˈpɛrd/

Unprepared

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

unearthly

Meaning
Strange or unnatural in a way that seems not of this world
Example
The forest was filled with an unearthly glow.
B1 noun /ˈjuːnɪvɜːrs/

Universe

Meaning
all existing matter and space; the cosmos
Example
Scientists study the universe to understand its mysteries.
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.
B2 adjective /ˌʌnəˈvɔɪdəbəl/

Unavoidable

Meaning
cannot be avoided; certain to happen; inevitable
Example
The meeting is unavoidable, so we must attend.
C2 adjective /ʌnˈkɒnʃənəbl/

unconscionable

Meaning
shockingly unfair or unreasonable
Example
The company made unconscionable profits from the crisis.
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.
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 /juˈzɜrp/

usurp

Meaning
to take someone's position of power illegally or by force
Example
The general tried to usurp the king's throne.
C1 adjective /ʌnˈtoʊld/

Untold

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

undergo

Meaning
to go through something, especially something unpleasant or difficult
Example
She had to undergo surgery to recover.
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 /ʌnˈfɔːltərɪŋ/

unfaltering

Meaning
Steady and resolute; not weakening or hesitating
Example
She continued with unfaltering determination.
B2 verb /ˌʌndərˈɛstɪmeɪt/

underestimate

Meaning
To judge something as less important or smaller than it really is.
Example
Never underestimate the power of teamwork.
C1 adjective /ʌnˈsɪvəl/

Uncivil

Meaning
not polite or courteous; rude and discourteous in behavior
Example
His uncivil remarks during the meeting offended everyone present.
C1 adjective /ʌnˈsaɪtli/

unsightly

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

Uneven

Meaning
not level or smooth; not regular or consistent
Example
The road was uneven and full of potholes.
B1 preposition, adverb, adjective /ˌʌndərˈniːθ/

underneath

Meaning
Located directly below or beneath something
Example
The keys were hidden underneath the pile of papers.
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.
C1 adjective /ˌʌndərˈsaɪzd/

undersized

Meaning
Smaller than the usual or expected size.
Example
The undersized puppy struggled to keep up with its siblings.
C2 verb /ˈʌndjʊleɪt/

undulate

Meaning
To move with a smooth, wave-like motion.
Example
The snake undulated across the sand.
B2 adjective /ˌʌndɪˈstɜːrbd/

Undisturbed

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

unsullied

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

Unruly

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

undulous

Meaning
Having a wavy surface or form.
Example
The artist painted the undulous sea at sunset.
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.
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 ʌnˈtʃɑːtɪd

uncharted

Meaning
Not mapped or surveyed; unknown or unexplored.
Example
The mission aimed to explore uncharted areas of the planet.
A1 preposition /ˈʌndər/

under

Meaning
in or to a lower position than something
Example
The cat is under the table.
C1 adjective /ʌnˈkʌltʃəd/

Uncultured

Meaning
lacking good manners, refinement, or education; uncivilized
Example
His uncultured behavior embarrassed everyone at the dinner party.
C1 adjective /ˌʌnɪnˈhɪbɪtɪd/

uninhibited

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

Unwilling

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

unwitting

Meaning
Not aware of what is happening; done without realizing.
Example
She became an unwitting participant in the scam.
B2 noun /ˈʌndərkləʊðz/

underclothes

Meaning
Clothing worn beneath outer clothes, such as underwear or lingerie
Example
He folded his underclothes neatly before packing them.
B2 noun ˌjuːtɪlaɪˈzeɪʃən

utilization

Meaning
The action of making practical and effective use of something.
Example
Increased plastic utilization calls for better waste management.
C1 adjective ʌnˈpær.ə.leld

Unparalleled

Meaning
Having no equal; unmatched, peerless, and supreme in quality or achievement.
Example
The unparalleled beauty of the Taj Mahal amazes visitors.
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.
A1 preposition/conjunction /ʌnˈtɪl/

until

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

Unbelievable

Meaning
impossible to believe; extremely surprising or remarkable
Example
The magician's performance was absolutely unbelievable.
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.
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 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.
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 /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.
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.
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 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.
A1 adjective /ˈjuːs.fəl/

Useful

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

untrammeled

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

utilize

Meaning
to make practical or effective use of something
Example
The company aims to utilize solar energy for production.
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 adjective /ʌnˈstɪntɪŋ/

unstinting

Meaning
given generously without holding back
Example
She received unstinting support from her family.
C2 adjective /ˌʌltrəˈmɒnteɪn/

ultramontane

Meaning
beyond the mountains, especially referring to support for the Pope over local church authority
Example
The debate highlighted the ultramontane position in church politics.
C1 adjective /ˌʌnkɒnstɪˈtuːʃənəl/

Unconstitutional

Meaning
not in accordance with a political constitution; violating constitutional principles
Example
The court declared the new law unconstitutional.
A2 verb /ʌpˈdeɪt/

update

Meaning
to make something more modern or current; to provide new information
Example
Please update your software regularly.
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.
B1 adjective /ˌʌndərˈstændəbl/

understandable

Meaning
Able to be understood; reasonable or justifiable.
Example
Her reaction was understandable given the situation.
B1 adjective /ˈʌpˌkʌmɪŋ/

upcoming

Meaning
about to happen or appear
Example
The upcoming event will be held next week.
B2 adjective /ʌnˈskɪld/

Unskilled

Meaning
lacking technical training or ability; not requiring special skills
Example
Many unskilled workers are looking for training opportunities.
C1 adjective /ˌʌnsəˈfɪstɪˌkeɪtɪd/

unsophisticated

Meaning
Lacking worldly experience, refinement, or complexity.
Example
The villagers led an unsophisticated but happy life.
A2 conjunction /ʌnˈlɛs/

unless

Meaning
except if
Example
We won't go unless it stops raining.
C1 noun /ˈjuːnɪsən/

unison

Meaning
Simultaneous performance or utterance of action or speech.
Example
The choir sang in unison.
C1 adjective /ʌnˈkɛmpt/

unkempt

Meaning
Having an untidy or disheveled appearance.
Example
He looked unkempt after sleeping outdoors all night.
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.
C1 adjective /ʌnˈtaɪmli/

Untimely

Meaning
happening at an inappropriate or inconvenient time; premature
Example
His untimely death at the age of thirty shocked everyone.
C1 verb /ʌnˈroʊl/

unroll

Meaning
to open something that is rolled up; to spread out gradually
Example
She unrolled the map on the table to find the route.
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.
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.
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 /ʌnəˈpiːzd/

unappeased

Meaning
Not satisfied or calmed; still feeling discontent or anger
Example
Despite the apology, she remained unappeased.
B1 adjective /ʌnˈplɛz.ənt/

Unpleasant

Meaning
not giving or causing pleasure; disagreeable
Example
The medicine had an unpleasant taste.
B2 adverb /ʌnˈplɛzəntli/

unpleasantly

Meaning
in a way that causes discomfort, annoyance, or displeasure; in an unfriendly or disagreeable manner
Example
The room was unpleasantly hot during the afternoon.
C2 noun /ˈʌm.brə/

Umbra

Meaning
the fully shaded inner region of a shadow cast by an opaque object; the dark center of a sunspot
Example
During the eclipse, we stood in the moon's umbra.
C1 adjective ʌnˈwɔːr.rən.tɪd

unwarranted

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

unchanging

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

unfledged

Meaning
Inexperienced, immature, or not fully developed.
Example
The unfledged writer struggled to complete his first novel.
B2 adjective /ˌʌndɪˈzaɪərəbl/

Undesirable

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

unpredictability

Meaning
The quality of being impossible to predict or anticipate.
Example
The unpredictability of the weather made the trip uncertain.
A2 adjective /ʌnˈtaɪdi/

Untidy

Meaning
not neat or orderly; messy and disorganized
Example
Her untidy room was filled with clothes scattered everywhere.
B1 adjective /ˌʌnˈpeɪd/

Unpaid

Meaning
not paid for; without payment or salary
Example
She worked as an unpaid intern for six months.
C2 adjective /ˌʌnsɛrəˈmoʊniəs/

unceremonious

Meaning
Done without formality or courtesy; abrupt or rude.
Example
He made an unceremonious exit from the party.
B1 adjective /ʌnˈsɜːrtən/

Uncertain

Meaning
not able to be relied on; not known or definite; not having reliable knowledge
Example
I am uncertain about my future career plans.
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 /ʌnˈtʃælɪndʒd/

Unchallenged

Meaning
not disputed or questioned; accepted without opposition; having no rival
Example
He remained the unchallenged champion for five years.
C1 adjective ʌnˈskruːpjʊləs

unscrupulous

Meaning
Having or showing no moral principles; not honest or fair.
Example
Unscrupulous peers can lead adolescents to delinquency.
C1 adjective /ʌnˈvɔɪst/

unvoiced

Meaning
not expressed in speech; in phonetics, a sound produced without vocal cord vibration
Example
The student kept her opinion unvoiced during the meeting.
B2 adjective /ˌʌnrɪˈzɒlvd/

unresolved

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

unalloyed

Meaning
Pure, complete, and not mixed with anything else.
Example
She felt unalloyed joy at the news of her success.
C2 verb /ˌʌndərˈɡɜːrd/

undergird

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

Undue

Meaning
excessive; inappropriate; more than is necessary or proper
Example
The teacher complained about undue pressure from parents.
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.
C1 adjective /ʌnˈseɪvəri/

unsavory

Meaning
Disagreeable, unpleasant, or morally offensive.
Example
The politician was linked to an unsavory scandal.
B2 adjective /ʌnˈfeɪ.vər.ə.bəl/

Unfavourable

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

unicellular

Meaning
Consisting of a single cell.
Example
Amoebas are unicellular organisms.
B2 adjective /ʌnˈsiːn/

Unseen

Meaning
not previously seen or noticed; invisible; hidden
Example
The unseen forces of nature can be very powerful.
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.
B1 adjective /ʌnˈnoʊn/

Unknown

Meaning
not known or identified; unfamiliar
Example
The author of this letter remains unknown.
B2 adjective /ʌnˈprɒf.ɪ.tə.bl̩/

Unprofitable

Meaning
not yielding profit or gain; not producing financial benefit
Example
The unprofitable business was forced to close down after three years.
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.