unicellular
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C1 adjective /ˌjuːnɪˈsɛljʊlər/

unicellular

Meaning
Consisting of a single cell.
Example
Amoebas are unicellular organisms.
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.
C1 adjective ˌʌn.pəˈtɜːbd

unperturbed

Meaning
Not worried or disturbed by something; calm and composed.
Example
She remained unperturbed despite the challenges.
C1 adjective /ˌʌnɪnˈhɪbɪtɪd/

uninhibited

Meaning
Not restrained or restricted; free in behavior or expression.
Example
She gave an uninhibited laugh at the joke.
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.
C1 noun /ˈʌp.raɪt.nəs/

Uprightness

Meaning
the quality of being honest and morally correct; integrity
Example
His uprightness in business dealings earned him great respect.
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.
A2 noun /ˈʌndərweər/

underwear

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

uninhabitable

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

uninformed

Meaning
lacking knowledge or awareness about a particular subject; not educated or informed
Example
The decision was made by an uninformed committee.
C1 adjective /ˌʌndərˈsaɪzd/

undersized

Meaning
Smaller than the usual or expected size.
Example
The undersized puppy struggled to keep up with its siblings.
C1 adjective /ʌnˈtʃælɪndʒd/

Unchallenged

Meaning
not disputed or questioned; accepted without opposition; having no rival
Example
He remained the unchallenged champion for five years.
B2 adjective /ʌnˈriːdəbl/

unreadable

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

Unskilled

Meaning
lacking technical training or ability; not requiring special skills
Example
Many unskilled workers are looking for training opportunities.
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.
A2 noun /ˈʌndərwɛr/

Under wear

Meaning
clothing worn under other clothes, next to the skin
Example
She bought new underwear from the department store.
B1 adjective /ʌnɪmˈplɔɪd/

Unemployed

Meaning
without a job; not having paid work
Example
He has been unemployed for six months now.
C2 adjective /ˌʌnəˈsweɪdʒd/

unassuaged

Meaning
Not made less intense or relieved; unrelieved.
Example
His grief remained unassuaged despite the passage of time.
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.
C1 verb /ʌnˈrævəl/

unravel

Meaning
To undo twisted or knitted threads; to solve or explain something complicated.
Example
The detective worked hard to unravel the mystery.
C2 adjective /ʌnˈstɪntɪŋ/

unstinting

Meaning
given generously without holding back
Example
She received unstinting support from her family.
B2 adverb /ʌnˈkaɪndli/

unkindly

Meaning
in a cruel, harsh, or unsympathetic manner
Example
She spoke unkindly about her colleague during the meeting.
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 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 /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 /ʌnˈbaɪəst/

unbiased

Meaning
Not showing prejudice; impartial and fair.
Example
The report gave an unbiased view of the situation.
B2 adjective /ˌʌnˈkɔːrdɪneɪtɪd/

uncoordinated

Meaning
lacking coordination, not well-organized or clumsy in movement
Example
His movements were uncoordinated, making him prone to accidents.
B1 adjective /ʌnˈedjʊkeɪtɪd/

Uneducated

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

unscathed

Meaning
Without suffering any injury, damage, or harm.
Example
She escaped from the accident unscathed.
C1 adjective ʌnˈtʃɑːtɪd

uncharted

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

unpredictable

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

Unused

Meaning
not being used; not having been used before
Example
There are many unused rooms in this old mansion.
C1 adjective /ʌnˈtaɪərɪŋ/

Untiring

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

underman

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

Undivided

Meaning
whole; complete; not separated or split
Example
The team showed undivided attention to the coach's instructions.
C2 noun /ˈjuːʒəri/

usury

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

unremitting

Meaning
Never relaxing or stopping; persistent.
Example
Her unremitting efforts finally paid off.
A2 noun /ˌʌndərˈstændɪŋ/

understanding

Meaning
the ability to grasp the meaning, significance, or nature of something
Example
Her understanding of the issue was impressive.
A1 interjection /ʌ/

uh

Meaning
a sound people make when they hesitate or are unsure what to say next.
Example
Uh, I’m not sure if that’s the right answer.
B2 adjective /ˌʌndɪˈsaɪdɪd/

Undecided

Meaning
not having made a decision; uncertain
Example
She was undecided about which college to attend.
B1 adjective /ʌnˈlaɪk/

Unlike

Meaning
different from; not similar to
Example
Unlike his brother, he prefers quiet activities.
C2 verb /ʌnˈkloʊð/

unclothe

Meaning
to remove clothing from someone or something
Example
The nurse helped unclothe the patient for the examination.
B1 adjective /ˈjuːnɪfɔːrm/

Uniform

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

unconscionable

Meaning
shockingly unfair or unreasonable
Example
The company made unconscionable profits from the crisis.
A1 adjective /ˈjuːs.fəl/

Useful

Meaning
having a beneficial purpose; practical
Example
This tool is very useful for fixing problems.
A2 adjective /ʌnˈhel.θi/

Unhealthy

Meaning
harmful to health; not in good health; detrimental to well-being
Example
Eating too much fast food is unhealthy for your body.
C2 noun /ˈʌŋɡwənt/

unguent

Meaning
A soothing or healing ointment applied to the skin.
Example
The doctor applied an unguent to heal the burn.
B1 adjective /ʌnˈkʊkt/

uncooked

Meaning
Not cooked; in a raw state.
Example
Eating uncooked meat can be dangerous.
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.
A2 adjective /ˈjuːʒəl/

usual

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

Unconstitutional

Meaning
not in accordance with a political constitution; violating constitutional principles
Example
The court declared the new law unconstitutional.
B2 adjective /ʌnprɪˈpɛrd/

Unprepared

Meaning
not ready or able to deal with something
Example
He was unprepared for the difficult exam.
C1 verb /ˌʌndərˈlaɪ/

underlie

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

Unending

Meaning
continuing forever; without end
Example
The unending rain made the day feel gloomy.
C1 adjective /ʌnˈmaɪndfəl/

Unmindful

Meaning
not paying attention; careless; heedless
Example
She was unmindful of the danger around her.
B2 noun /ˈʌndərˌteɪkɪŋ/

undertaking

Meaning
A task, project, or responsibility that someone agrees to do.
Example
Starting a new company is a difficult undertaking.
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 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.
A1 adverb /ʌp/

up

Meaning
towards a higher position or level
Example
He climbed up the ladder quickly.
C2 adjective /juːˈʒʊəriəs/

usurious

Meaning
Charging excessively high interest rates on loans.
Example
The bank was accused of offering loans at usurious rates.
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.
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.
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.
B1 adjective /ʌnˈwel/

Unwell

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

unsteady

Meaning
not firm or stable; likely to change or fail
Example
She felt unsteady on her feet after the long journey.
A2 noun /ˈjuːzər/

user

Meaning
a person who uses or operates something
Example
He is a frequent user of this app.
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 verb /ˌʌndərˈmaɪn/

undermine

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

Unhygienic

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

unfledged

Meaning
Inexperienced, immature, or not fully developed.
Example
The unfledged writer struggled to complete his first novel.
B1 adjective /juːˈniːk/

Unique

Meaning
being the only one of its kind; unlike anything else
Example
Every snowflake is unique in its pattern.
B2 adjective /ˌʌndɪˈstɜːrbd/

Undisturbed

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

ursine

Meaning
Relating to or resembling a bear.
Example
The man’s ursine strength amazed everyone.
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 /ˌʌndərɪkˈspoʊzd/

underexposed

Meaning
insufficiently exposed to light (in photography) or not given enough attention
Example
The photo was underexposed and looked too dark.
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.
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 /ˌʌnəˈfɪʃ.əl/

Unofficial

Meaning
not officially authorized or confirmed; informal
Example
The unofficial results showed a close race.
C2 adjective /ʌnəˈpiːzd/

unappeased

Meaning
Not satisfied or calmed; still feeling discontent or anger
Example
Despite the apology, she remained unappeased.
A1 preposition/conjunction /ʌnˈtɪl/

until

Meaning
up to the time of
Example
I will wait until you come back.
C2 adjective /ɜːrˈbeɪn/

urbane

Meaning
showing polished manners, refinement, and sophistication
Example
He was an urbane gentleman who charmed everyone at the party.
B1 verb /ʌnˈræp/

unwrap

Meaning
remove wrapping or covering from something; reveal something gradually or clearly
Example
She carefully unwrapped the gift with excitement.
B2 adverb /ˈʌt.ə.li/

Utterly

Meaning
completely; absolutely; totally
Example
The movie was utterly boring and I fell asleep.
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.
C2 adjective /ʌnˈspɛərɪŋ/

unsparing

Meaning
Showing no mercy or generosity; harsh or severe.
Example
The critic was unsparing in his review of the play.
A2 adjective /ˈjuːs.ləs/

Useless

Meaning
having no beneficial purpose; not useful
Example
This broken computer is completely useless.
A2 verb /ʌpˈdeɪt/

update

Meaning
to make something more modern or current; to provide new information
Example
Please update your software regularly.
B2 adjective /ˌʌnˈnoʊ.tɪst/

Unnoticed

Meaning
not seen or observed; ignored
Example
His hard work went unnoticed by his manager.
C1 adjective /ˌʌn.əˈdʌl.tə.reɪ.tɪd/

Unadulterated

Meaning
not mixed or diluted with any different or extra elements; pure
Example
She felt unadulterated joy when she heard the news.
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 verb /ˈʌndjʊleɪt/

undulate

Meaning
To move with a smooth, wave-like motion.
Example
The snake undulated across the sand.
C2 adjective /ʌnˈsʌlid/

unsullied

Meaning
not spoiled or made impure; perfectly clean or pure
Example
His reputation remained unsullied despite the accusations.
B2 adjective /ˌʌnəˈvɔɪdəbəl/

Unavoidable

Meaning
cannot be avoided; certain to happen; inevitable
Example
The meeting is unavoidable, so we must attend.
C1 adjective /ʌnˈsteɪtɪd/

unstated

Meaning
not expressed directly in words; implied or left unsaid
Example
The contract included several unstated expectations.
B1 verb /juˈnaɪt/

unite

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

uncouth

Meaning
Lacking good manners, refinement, or grace; awkward or rough.
Example
His uncouth behavior shocked the guests at the party.
B2 verb ˈjuːnɪfaɪ

unify

Meaning
To make or become united, uniform, or whole; to bring together into a single unit.
Example
Adolescents unify with peers for social acceptance.
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.
B2 verb /ʌpˈhoʊld/

uphold

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

ubiquitous

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

Unbelief

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