itchiness
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C1 noun /ˈɪtʃ.i.nəs/

itchiness

Meaning
The quality or condition of feeling an irritating sensation on the skin that causes a desire to scratch.
Example
Eye itchiness often leads to rubbing.
C2 adjective /ɪnˈtræn.sɪ.dʒənt/

intransigent

Meaning
Unwilling or refusing to change one's views or to agree about something.
Example
His intransigent stance delayed the agreement.
C2 noun /ˌɪmprəˈpraɪəti/

impropriety

Meaning
Failure to observe standards of honesty or modesty; improper behavior.
Example
The politician was accused of financial impropriety.
A2 adjective /ˈɪn.dɔːr/

indoor

Meaning
situated, occurring, or used inside a building
Example
Indoor plants can improve air quality at home.
C1 noun /ɪnˈtruː.ʒən/

intrusion

Meaning
Unauthorized entry into a system or place without permission
Example
The company detected an intrusion in its server.
C1 adjective ɪmˈpɛkəbl

impeccable

Meaning
In accordance with the highest standards; faultless.
Example
His impeccable taste in fashion was admired by all his peers.
B2 adjective /ɪnˈtɒlərənt/

intolerant

Meaning
unwilling to accept or respect beliefs or behavior different from one's own
Example
He is intolerant of any opinion that differs from his own.
B1 adjective /ɪmˈpeɪʃənt/

impatient

Meaning
Not able to wait calmly; restless and eager for something to happen.
Example
She grew impatient while waiting in the long queue.
C1 adjective /ɪmˈpɛndɪŋ/

impending

Meaning
about to happen soon, usually something unpleasant or threatening
Example
The villagers were worried about the impending flood.
B2 adjective /ɪmˈper.ə.tɪv/

imperative

Meaning
Of vital importance; crucial; giving or expressing a command.
Example
It is imperative to address the climate crisis immediately.
C1 noun /ɪˈmɜː.ʃən/

immersion

Meaning
Complete engagement in an environment or experience.
Example
Immersion in VR games makes users feel like they are inside the virtual world.
B2 noun /ɪnˈtɒlərəns/

intolerance

Meaning
unwillingness to accept or endure beliefs, behaviors, or conditions different from one's own
Example
The leader was criticized for his intolerance toward other religions.
C2 noun /ˌɪnkənˈɡruːəti/

incongruity

Meaning
The state of being inconsistent or out of place.
Example
The incongruity of his cheerful mood during the funeral shocked everyone.
B2 adjective /ɪˈmens/

Immense

Meaning
extremely large or great; huge
Example
The immense mountain range stretched across the horizon.
C2 noun /ˈɪrɪɡənt/

irrigant

Meaning
A liquid used for irrigation, especially in medical or agricultural contexts.
Example
The doctor used a sterile irrigant during the procedure.
C2 noun /ˌɪnkrʌˈsteɪʃən/

incrustation

Meaning
a crust or hard coating formed on the surface of something
Example
The old pipes were blocked due to heavy incrustation of minerals.
C1 adjective /ˌɪlɪˈdʒɪtɪmət/

illegitimate

Meaning
Not authorized by law, rules, or standards; not recognized as valid.
Example
The court ruled the contract to be illegitimate.
C2 verb /ɪˈniː.bri.eɪt/

inebriate

Meaning
to intoxicate; to make someone drunk
Example
The strong wine was enough to inebriate even the most experienced drinker.
B2 adverb /aɪˈrɒnɪkli/

ironically

Meaning
in a way that is contrary to what is expected or intended
Example
Ironically, the fire station burned down.
C1 adjective /ɪnˈtɒl.ər.ə.bəl/

Intolerable

Meaning
unable to be endured; extremely unpleasant or painful
Example
The noise from the construction site was intolerable.
C1 noun /ˈɪntərˌluːd/

interlude

Meaning
A short period of time that comes between two events; an interval.
Example
There was a brief musical interlude between the two acts of the play.
B1 noun /ɪnˈtɛnʃən/

intention

Meaning
A plan, aim, or purpose behind an action.
Example
Her intention was to finish the project before the deadline.
C2 adjective /ˌɪndɪˈsɒljʊbl/

indissoluble

Meaning
Unable to be destroyed, broken, or dissolved.
Example
Marriage was once considered an indissoluble bond.
C2 adjective /ˌɪnɪkˈstrɪkəbl/

inextricable

Meaning
Impossible to separate or escape from.
Example
The two friends shared an inextricable bond.
C1 adjective /ˈɪnfəməs/

infamous

Meaning
well known for some bad quality or deed
Example
The dictator was infamous for his cruelty.
A2 verb /ˌɪntrəˈduːs/

introduce

Meaning
to present someone; to bring in for the first time
Example
Let me introduce you to my friend.
C1 noun /ɪmˈbæl.əns/

Imbalance

Meaning
lack of proportion or relation between corresponding things; unequal distribution
Example
The doctor said the patient's dizziness was caused by an inner ear imbalance.
C2 noun /ˌɪnkəˈpæsəti/

incapacity

Meaning
the lack of ability, power, or fitness to do something
Example
His mental incapacity prevented him from making important decisions.
C2 verb /ɪmˈpjuːt/

impute

Meaning
to attribute a fault or responsibility to someone
Example
They imputed the company's success to good leadership.
B2 adjective aɪˈkɒnɪk

iconic

Meaning
Very famous or popular, especially being considered to represent particular opinions or a particular time.
Example
The line "It was the best of times..." is iconic.
A1 preposition /ˈɪntuː/

into

Meaning
expressing movement or direction to the inside of something
Example
She walked into the room quietly.
C2 noun /ˌɪnsjəˈlærəti/

insularity

Meaning
The state of being isolated or narrow-minded.
Example
The insularity of the group prevented them from accepting new ideas.
C2 noun /ɪnˈkɒnstənsi/

inconstancy

Meaning
The quality of changing frequently or being unreliable.
Example
The inconstancy of the weather makes planning difficult.
C1 noun /ɪnˈsek.tɪ.saɪd/

Insecticide

Meaning
a substance used for killing insects; a chemical pesticide that targets insects
Example
The farmer sprayed insecticide on his crops to protect them from harmful bugs.
C2 adjective /ˌɪrɪˈtriːvəbl/

irretrievable

Meaning
impossible to recover or regain
Example
The documents were lost in an irretrievable way after the fire.
B2 adjective /ɪmˈpɜːrfɪkt/

imperfect

Meaning
Not perfect; having faults or flaws.
Example
The painting was beautiful despite being imperfect.
B1 adverb /ˈɪnstəntli/

instantly

Meaning
immediately, without any delay
Example
He replied instantly to the message.
C2 adjective ˌɪn.ɪ.fɪˈkeɪ.ʃəs

inefficacious

Meaning
Not producing any or the desired effect; ineffective.
Example
The treatment was inefficacious in curing the disease.
A2 adverb /ɪˈmiːdiətli/

immediately

Meaning
at once; without delay
Example
She responded immediately to the emergency call.
C2 verb /ɪnˈsɪnəˌreɪt/

incinerate

Meaning
to burn something completely until it is reduced to ashes
Example
The city decided to incinerate the medical waste for safety.
C2 noun /ˈaɪ.ərn.wʊd/

Ironwood

Meaning
a hard, dense wood from various trees; also the tree itself that produces small flowers
Example
The ironwood tree blooms with tiny white flowers.
C2 noun /ɪnˈtɛstəsi/

intestacy

Meaning
The condition of dying without having made a valid will.
Example
His estate was divided according to the laws of intestacy.
B2 adjective /ˌɪnɪˈfɪʃənt/

Inefficient

Meaning
not achieving maximum productivity; wasteful of time or resources
Example
The old computer system was inefficient and wasted a lot of time.
C2 verb /ˈɪmprɛɡneɪt/

impregnate

Meaning
To make pregnant; to fill or saturate with something.
Example
The scientist used a method to impregnate the material with resin.
C1 noun /ɪmˈpɜː.mə.nəns/

impermanence

Meaning
The state or fact of lasting for only a limited period of time.
Example
The philosophy of Buddhism emphasizes the impermanence of life.
C1 adjective /ɪnˈdʌldʒənt/

indulgent

Meaning
Having a tendency to be overly generous or lenient with someone.
Example
The indulgent mother allowed her child to stay up late.
C2 noun /ɪˌluːmɪˈnɑːti/

illuminati

Meaning
a group of people claiming to have special enlightenment or secret knowledge, often linked to conspiracies
Example
Many conspiracy theories involve the Illuminati as a secret world-controlling group.
A1 pronoun /ɪts/

its

Meaning
Belonging to or associated with a thing previously mentioned.
Example
The company changed its logo last year.
C2 adjective /ɪnˈdʒɛnjuəs/

ingenuous

Meaning
Innocent, naive, and unsuspecting; showing childlike simplicity and sincerity.
Example
Her ingenuous smile revealed her genuine kindness.
B2 adjective /ɪˈmætʃʊr/

Immature

Meaning
not fully developed; lacking emotional or intellectual development; childish
Example
His immature behavior during the meeting disappointed everyone.
A2 adjective ˌɪn.təˈnæʃ.ən.əl

international

Meaning
Existing, occurring, or carried on between two or more nations and their citizens.
Example
International standards improve competitiveness.
B2 noun /ɪmˈpɒlɪtnəs/

impoliteness

Meaning
lack of good manners or courtesy; rude behavior
Example
His impoliteness towards the guests shocked everyone.
B2 noun /ˌɪnstəˈbɪləti/

instability

Meaning
lack of stability or balance; tendency to change, fail, or collapse easily
Example
Political instability has slowed economic growth in the region.
C1 noun /ˈɪnˌmeɪt/

inmate

Meaning
a person confined to an institution such as a prison or hospital
Example
The prison has over a thousand inmates.
C2 noun /aɪˈoʊtə/

iota

Meaning
An extremely small amount.
Example
He did not show an iota of fear.
B2 noun ˈɪnər strɛŋkθ

inner strength

Meaning
Mental or spiritual power that helps a person cope with difficulties.
Example
Community service fosters inner strength in individuals.
B1 verb /aɪˈdentɪfaɪ/

identify

Meaning
to recognize; to establish who someone is
Example
Can you identify the suspect?
B2 noun /ˈɪnstɪŋkt/

instinct

Meaning
A natural way of behaving or reacting that does not require learning.
Example
Birds build nests by instinct.
C2 noun /ˌɪkθiˈɒlədʒi/

ichthyology

Meaning
The branch of zoology that deals with fish.
Example
He pursued a degree in ichthyology at the university.
C2 adjective /ˌɪn.trəˈsɛl.jʊ.lər/

intracellular

Meaning
Located or occurring within a cell.
Example
The drug works by targeting intracellular bacteria.
B1 verb ɪnˈkriːsɪŋ

increasing

Meaning
Becoming or making greater in size, amount, intensity, or degree; growing.
Example
Increasing awareness about education is necessary.
C1 noun /ˌɪnklɪˈneɪʃən/

inclination

Meaning
A natural tendency or urge to act or feel in a particular way.
Example
She has an inclination towards helping others.
C1 adjective /ˈɪmpjəd(ə)nt/

impudent

Meaning
not showing due respect for another person; rude
Example
The impudent child talked back to the teacher.
B1 adjective /ɪnˈvɑːlvd/

involved

Meaning
complicated or engaged in something
Example
She was deeply involved in community service.
B2 adjective /ˌɪnsəˈfɪʃənt/

insufficient

Meaning
Not enough; inadequate.
Example
His explanation was insufficient to clear the confusion.
C1 adjective /ɪˈnɔːrdənət/

inordinate

Meaning
Excessive or unusually large in degree.
Example
She spent an inordinate amount of time on her phone.
B2 noun /ˌɪntərˈfɪərəns/

interference

Meaning
the action of interfering with something
Example
The radio signal was disrupted due to interference from nearby electronics.
C1 verb /ɪnˈfɛst/

infest

Meaning
to overrun in large numbers, especially so as to cause damage or discomfort
Example
The old house was infested with rats.
C1 adjective ɪˈluː.sər.i

illusory

Meaning
Based on illusion; not real although seeming to be.
Example
His sense of security was entirely illusory.
C2 noun /ˌɪntərˈlɒkjətər/

interlocutor

Meaning
a person who takes part in a conversation or dialogue
Example
She was a skilled interlocutor during the debate.
C1 adjective ɪnˈsaɪ.sɪv

incisive

Meaning
Intelligently analytical and clear-thinking; showing clear thought and good understanding of what is important.
Example
His incisive comments revealed the core issues.
C1 noun ˌɪnsjʊˈleɪʃən

insulation

Meaning
Material used to prevent heat, sound, or electricity from being transmitted from one area to another.
Example
Insulation of food storage areas can prevent pests from entering.
C2 noun /ɪnˈhɪərəns/

inherence

Meaning
The state of being an essential or permanent part of something.
Example
The inherence of risk is part of every business venture.
C1 adjective /ˈɪrɪtəbl/

irritable

Meaning
easily annoyed or made angry
Example
She became irritable after working long hours without rest.
B2 adjective /ˌɪnkəmˈpliːt/

incomplete

Meaning
Not finished, lacking some parts or not whole.
Example
Her report was incomplete and needed further details.
C2 noun /ɪnˈdɛntʃər/

indenture

Meaning
A formal legal agreement, contract, or document, often relating to work or service.
Example
In the 18th century, many workers came under indenture to work overseas.
B2 noun /ˈɪmɪɡrənt/

immigrant

Meaning
a person who comes to live permanently in a foreign country
Example
The city has welcomed many new immigrants this year.
C1 adjective /ɪnˈfriːkwənt/

infrequent

Meaning
Happening rarely or not often.
Example
He made infrequent visits to his hometown after moving abroad.
B1 noun ɪnˈven.ʃən

invention

Meaning
The action of inventing something, typically a process or device.
Example
The invention revolutionized communication.
C2 noun /ɪˈnænɪti/

inanity

Meaning
a nonsensical remark or action; silliness; emptiness
Example
The speech was full of inanities that bored the audience.
C2 adjective /ɪnˈsɛndiˌɛri/

incendiary

Meaning
designed to cause fires or stir up conflict
Example
The politician’s incendiary remarks angered the crowd.
C2 noun /ɪnˈsɪpiəns/

incipience

Meaning
the beginning or initial stage of something
Example
The project was still in its incipience when funding was approved.
C2 adjective /ɪmˈprɒvɪdənt/

improvident

Meaning
Not having or showing foresight; spending wastefully or without thought for the future.
Example
His improvident habits left him with no savings.
C2 noun /ˈɪntəˌkrɒpɪŋ/

intercropping

Meaning
The agricultural practice of cultivating two or more crops simultaneously in the same field to maximize land use efficiency and improve soil health.
Example
Intercropping can help improve soil fertility and pest control.
C2 noun /ɪnˈvɛstɪtʃər/

investiture

Meaning
the formal ceremony of conferring authority, rank, or office
Example
The king held an investiture ceremony for the new knight.
C1 noun /ɪnˌkɑːsəˈreɪʃən/

incarceration

Meaning
the state of being imprisoned or confined
Example
The criminal faced years of incarceration for his crimes.
C2 adjective /ɪˈnjʊərd/

inured

Meaning
Accustomed to something, especially something unpleasant.
Example
After years of hardship, she was inured to suffering.
C2 noun /ˈɪmɪˌteɪtər/

imitator

Meaning
a person who copies the behavior, style, or actions of others
Example
He became famous as an imitator of popular singers.
C1 adjective /ˈɪnsələnt/

insolent

Meaning
showing a rude and arrogant lack of respect
Example
The insolent student refused to follow the teacher's instructions.
A2 adjective /ɪmˈpɑːsəbl/

impossible

Meaning
not able to occur, exist, or be done
Example
It is impossible to finish this work in one day.
C2 adjective /ˌɪlˈneɪ.tʃəd/

ill-natured

Meaning
Having a bad or unpleasant character; unkind or malicious.
Example
He made an ill-natured remark about his colleague.
C1 noun /ɪmˈpjʊərəti/

impurity

Meaning
the state of being unclean or contaminated; a substance that makes something impure
Example
The scientist removed every impurity from the water sample.
C2 noun /ˌɪntərˈsɛsər/

intercessor

Meaning
a person who intervenes or pleads on behalf of another
Example
He acted as an intercessor to resolve the conflict between the two families.
C2 adjective /ɪmˈpɒndərəbl̩/

imponderable

Meaning
Something difficult or impossible to estimate, assess, or understand
Example
The outcome of the election depends on many imponderable factors.
C2 noun /ɪmˈprɑːvɪdəns/

improvidence

Meaning
Lack of foresight or care for future needs.
Example
His improvidence led to financial difficulties.
C2 adjective /ˈɪndələnt/

indolent

Meaning
Wanting to avoid activity or exertion; lazy.
Example
The indolent cat slept in the sun all afternoon.
A2 noun /ˌɪn.trəˈdʌk.ʃən/

introduction

Meaning
the action of introducing something or someone; an opening or beginning part
Example
The professor gave a brief introduction before starting the lecture.
C2 adjective /ˈɪkθiɪk/

ichthyic

Meaning
Relating to or resembling fish.
Example
The artist's painting had an ichthyic quality.
C1 noun /ɪmˈprɪzənmənt/

imprisonment

Meaning
the act of putting someone in prison; the state of being confined as punishment
Example
He faced imprisonment for violating the court order.
B2 noun /ˈɪdɪət/

idiot

Meaning
a person who acts in a way that is considered very stupid or foolish
Example
He acted like an idiot at the party last night.
B2 noun /ɪnˌtɜːrprəˈteɪʃən/

interpretation

Meaning
the action of explaining the meaning of something
Example
The teacher gave her own interpretation of the poem.
B2 adjective /ɪnˈtɛns/

intense

Meaning
Of extreme force, degree, or strength.
Example
She felt intense pain after the accident.
C2 noun /ˈɪɡ.nəˌmɪn.i/

ignominy

Meaning
Public shame, disgrace, or dishonor.
Example
He lived the rest of his life in ignominy after the scandal.
C2 verb /ˈɪntərˌdɪkt/

interdict

Meaning
to prohibit or forbid something by authoritative order, often by law or decree
Example
The court moved to interdict the sale of the illegal goods.
C2 adjective /ɪˈrɛzəluːt/

irresolute

Meaning
uncertain or indecisive; lacking determination
Example
He stood irresolute at the crossroads, unsure which path to take.
C2 verb /ɪnˈtɜːr/

inter

Meaning
To bury a dead body in the ground.
Example
They decided to inter the soldier with full honors.
B2 adjective /ɪmˈpɪəriəl/

imperial

Meaning
Relating to an empire or emperor; having supreme authority.
Example
The imperial palace was a symbol of the emperor's power.
C1 noun /aɪˈdiː.ə.lɪ.zəm/

Idealism

Meaning
the pursuit of high principles and noble goals; unrealistic pursuit of perfection
Example
His youthful idealism motivated him to join various social justice movements.
C1 adjective /ɪnˈseɪʃəbl̩/

insatiable

Meaning
impossible to satisfy; always wanting more
Example
Her insatiable curiosity drove her to read every book in the library.
C2 noun /ˈɪsməs/ or /ˈɪsθməs/

isthmus

Meaning
A narrow strip of land connecting two larger land areas, often with water on either side.
Example
The Panama Canal cuts through the Isthmus of Panama.
C2 adjective /ɪmˈpɪəriəs/

imperious

Meaning
Arrogantly domineering or overbearing.
Example
Her imperious tone made it hard for others to argue.
B1 adjective ɪnˈdʌs.tri.əl

industrial

Meaning
Relating to or characterized by industry.
Example
Industrial sectors boost exports.
C1 adjective /aɪˈreɪt/

irate

Meaning
Extremely angry.
Example
The customer became irate after waiting for hours.
C2 adjective /ɪnˈklɛmɛnt/

inclement

Meaning
unpleasantly cold, wet, or stormy (usually weather)
Example
The match was canceled due to inclement weather.
A2 noun/verb /ˈɪntrəst/ or /ˈɪntəˌrɛst/

interest

Meaning
A feeling of curiosity or concern about something; or money paid for the use of borrowed money.
Example
He showed great interest in learning new languages.
B2 noun ˌɪntəˈlektʃuəlz

intellectuals

Meaning
People possessing a highly developed intellect; scholars or academics.
Example
Intellectuals protested against the dominance.
C1 adjective /ˌɪnɔːrˈɡænɪk/

inorganic

Meaning
relating to substances that are not derived from living organisms; lacking organic structure or growth
Example
Inorganic compounds are commonly studied in chemistry labs.
C1 verb /ˈɪmprəvaɪz/

improvise

Meaning
To create or perform something spontaneously without preparation.
Example
The actor had to improvise his lines when he forgot the script.
C1 verb /ɪnˈkɜːr/

incur

Meaning
To bring upon oneself something undesirable, usually as a result of actions.
Example
He incurred a fine for parking in the wrong place.
C2 noun /ɪnˈtɛɡ.jʊ.mənt/

integument

Meaning
A natural outer covering, such as skin, shell, or rind.
Example
The snake sheds its integument as it grows.
C1 adjective /ɪnˈkɒmp(ə)rəbl/

incomparable

Meaning
Without an equal in quality or excellence; matchless.
Example
The view from the mountain was incomparable.