invincible
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C1 adjective /ɪnˈvɪnsəbl/

invincible

Meaning
too powerful to be defeated or overcome
Example
The team seemed invincible after winning ten matches in a row.
B1 noun ɪmˈpruːv.mənts

improvements

Meaning
The action of making or becoming better; an instance of something becoming or being made better.
Example
Continuous improvements increase productivity.
B2 noun /ˌɪn.dɪˈkeɪ.ʃən/

Indication

Meaning
a sign or piece of information that indicates something; a suggestion or hint
Example
The dark clouds were a clear indication that a storm was approaching the area.
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 noun /ˈɪn.trə.vɜːrt/

introvert

Meaning
A person who tends to be shy and prefers spending time alone rather than in groups.
Example
As an introvert, he preferred reading over attending parties.
B2 noun ˌɪmplɪmenˈteɪʃən

implementation

Meaning
The process of putting a decision or plan into effect; execution.
Example
Proper implementation of policies is crucial.
C2 noun /ˌɪmbəˈsɪləti/

imbecility

Meaning
Extreme foolishness, stupidity, or weakness of mind.
Example
The plan was abandoned due to its sheer imbecility.
C2 noun /ɪnˈfriːkwəns/

infrequence

Meaning
The state of occurring rarely or at long intervals.
Example
The infrequence of their meetings made it hard to maintain close ties.
C1 adjective /ˌɪnsɪˈdɛntəl/

incidental

Meaning
happening as a minor part or in connection with something else
Example
Incidental expenses like snacks and tips were included in the bill.
C1 adjective /ˈɪnfəməs/

infamous

Meaning
well known for some bad quality or deed
Example
The dictator was infamous for his cruelty.
C2 noun /ˌɪmprɪˈkeɪʃən/

imprecation

Meaning
A spoken curse or expression of strong condemnation.
Example
The angry crowd hurled imprecations at the corrupt official.
B1 adverb /ɪnˈkrɛdɪbli/

incredibly

Meaning
to a great degree; extremely or unbelievably
Example
The view from the top of the mountain was incredibly beautiful.
C1 noun /ˌaɪ.diˈɒl.ə.dʒi/

ideology

Meaning
A system of ideas and ideals, especially one that forms the basis of economic or political theory and policy.
Example
Democracy is based on the ideology of freedom and equality.
C2 verb /ɪˈmjʊər/

immure

Meaning
to confine or enclose someone against their will
Example
The prisoner was immured in a dark cell.
C1 verb /ɪnˈhɪbɪt/

inhibit

Meaning
to prevent or restrain someone or something from acting freely; to hinder
Example
Fear can inhibit personal growth.
C1 verb /ɪnˈsɪnjueɪt/

insinuate

Meaning
To suggest or hint something indirectly and often unpleasantly.
Example
He insinuated that she had lied about her qualifications.
C1 noun /ɪnˈædɪkwəsi/

inadequacy

Meaning
lack of sufficient ability, quality, or strength; a feeling of not being good enough
Example
She struggled with feelings of inadequacy at work despite her strong qualifications.
C1 adjective /ɪnˈdefɪnət/

Indefinite

Meaning
not clearly defined; uncertain; vague; unlimited in time
Example
The meeting has been postponed for an indefinite period.
C1 verb /ɪmˈpɛər/

impair

Meaning
to weaken or damage something, especially a function or ability
Example
Smoking can impair your lung capacity.
C2 noun /ˈaɪ.səˌbɑːr/

isobar

Meaning
A line on a weather map connecting points of equal atmospheric pressure.
Example
The meteorologist explained how isobars indicate wind speed and direction.
C1 adjective /ɪˈnɒkjuəs/

innocuous

Meaning
Not harmful or offensive.
Example
His remark was completely innocuous and not meant to offend anyone.
C2 verb ˈɪnʌndeɪt

inundate

Meaning
To flood; overwhelm someone or something with things or people to be dealt with
Example
The company was inundated with requests after the advertisement.
C1 adjective /ˌɪn.səˈbɔːr.dɪ.nət/

insubordinate

Meaning
Defiant of authority; disobedient to orders.
Example
The insubordinate employee refused to follow the manager's instructions.
C1 noun /aɪˈtɪnərɛri/

itinerary

Meaning
A planned route or schedule of a journey or trip.
Example
The travel agent gave us a detailed itinerary for our vacation.
C1 adjective ɪn ˈfleɪ.ʃə.ner.i

inflationary

Meaning
Characterized by or tending to cause monetary inflation; relating to rising prices.
Example
The government took measures to control inflationary pressures.
C2 adjective /ˈɪnˌbrɛd/

inbred

Meaning
existing naturally in a person or animal; also related to reproduction within a limited community
Example
He has an inbred sense of loyalty.
C1 noun /ˌɪndɪɡˈneɪʃən/

indignation

Meaning
Strong displeasure or anger caused by something unjust, offensive, or insulting.
Example
Public indignation grew after the unfair verdict.
B2 adjective /ˈaɪsi/

Icy

Meaning
extremely cold; covered with ice; unfriendly or hostile
Example
The icy wind made everyone shiver.
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 adjective ˌɪn.tə.dʒen.əˈreɪ.ʃən.əl

intergenerational

Meaning
Existing or occurring between different generations of a family.
Example
Intergenerational wisdom ensures cultural continuity.
C1 noun /ˌɪməˈrælɪti/

immorality

Meaning
the quality of being immoral; behavior that violates accepted moral standards
Example
The community condemned the immorality of the corrupt officials.
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.
C2 adjective /ɪnˈɛk.wɪ.tə.bəl/

inequitable

Meaning
Not fair or just; lacking in fairness or equality.
Example
The distribution of resources was inequitable among the workers.
C1 noun /ɪnˈkɜːrʒən/

incursion

Meaning
A sudden attack or invasion into a place or territory.
Example
The army repelled the enemy incursion at the border.
C2 adjective /ˌɪrɪˈtriːvəbl/

irretrievable

Meaning
impossible to recover or regain
Example
The documents were lost in an irretrievable way after the fire.
C2 noun /ɪnˈsaɪzər/

incisor

Meaning
a narrow-edged tooth at the front of the mouth, adapted for cutting
Example
The dentist noted that his upper left incisor was chipped.
A2 noun /ˈɪn.sekt/

Insect

Meaning
a small invertebrate animal with six legs and usually one or two pairs of wings
Example
The butterfly is a beautiful insect that flies from flower to flower.
C1 verb /ɪɡˈnaɪt/

ignite

Meaning
To catch fire or cause to catch fire; to start or arouse.
Example
The sparks ignited the dry leaves in seconds.
C1 adjective /ɪnˈfɜːm/

infirm

Meaning
Weak, especially due to old age or illness.
Example
The infirm old man needed assistance to walk.
B2 noun /ɪnˈtɛnsəti/

intensity

Meaning
The quality of being extreme, strong, or forceful in degree.
Example
The intensity of the storm frightened the villagers.
C2 adjective /ɪnˈkɒrɪdʒəbəl/

incorrigible

Meaning
incapable of being corrected, improved, or reformed
Example
He is an incorrigible optimist who never loses hope.
C1 noun /ˈɪnlɛt/

inlet

Meaning
A small arm of the sea, a lake, or a river; an opening or passage for entry.
Example
The boat entered a narrow inlet along the coast.
B1 verb ˈɪndɪkeɪts

indicates

Meaning
Point out; show; be a sign or symptom of; suggest as a desirable or necessary course of action.
Example
The rising trend indicates an urgent need for action.
B1 verb ɪnˈkriːsɪŋ

increasing

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

incredulous

Meaning
unwilling or unable to believe something
Example
He gave her an incredulous look when she claimed she could fly.
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 /ˌɪnkənˈɡruːəti/

incongruity

Meaning
The state of being inconsistent or out of place.
Example
The incongruity of his cheerful mood during the funeral shocked everyone.
C1 adjective /ɪmˈpɛtʃ.u.əs/

impetuous

Meaning
Acting or done quickly and without thought or care; impulsive.
Example
His impetuous decision led to unexpected consequences.
C1 noun /ˌɪmɔːrˈtæləti/

immortality

Meaning
the state of living forever; eternal life or lasting fame beyond death
Example
Many ancient cultures believed that heroes could achieve immortality through great deeds.
C1 adjective /ɪnˈɡreɪnd/

ingrained

Meaning
Firmly fixed or established; deeply rooted and difficult to change.
Example
His ingrained habits were hard to break.
C2 adjective /ˌɪnkænˈdɛsənt/

incandescent

Meaning
emitting light as a result of being heated; extremely bright or passionate
Example
The incandescent lamp lit up the entire hall.
C2 noun /ˌɪnsəˈrɛkʃən/

insurrection

Meaning
A violent uprising against an authority or government.
Example
The army was called in to suppress the insurrection.
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 adjective /ˌɪnɔːˈspɪʃəs/

Inauspicious

Meaning
unlucky; showing signs that future success is unlikely; unfavorable
Example
The dark clouds seemed inauspicious for the wedding.
C1 noun /ɪnˈdɪɡ.nə.ti/

Indignity

Meaning
treatment or circumstances that cause one to feel shame or loss of dignity; humiliation
Example
She refused to suffer the indignity of being searched without proper cause.
B2 noun /ˌɪnəˈbɪləti/

inability

Meaning
the state of being unable to do something
Example
His inability to make decisions affected his career.
B2 adjective, noun /ˌɪn.təlˈɛk.tʃu.əl/

intellectual

Meaning
Relating to the intellect; a person who engages in critical thinking and study.
Example
She enjoys intellectual discussions about philosophy.
B1 noun /ˈɪnsɪdənt/

incident

Meaning
an event or occurrence, often unpleasant or unusual
Example
The police quickly responded to the incident in the park.
C2 noun /ɪmˈpaɪ.ə.ti/

Impiety

Meaning
lack of piety or reverence, especially for a god; disrespect or irreverence toward religious matters
Example
His impiety shocked the religious community when he mocked their sacred ceremonies.
C1 noun /ˌɪnkoʊˈhɪrəns/

incoherence

Meaning
The quality of being unclear, confused, or lacking logical connection.
Example
His speech was full of incoherence and difficult to follow.
C1 adjective /ˌɪndɪˈspjuːtəbəl/

Indisputable

Meaning
impossible to deny or argue against; undeniable; certain
Example
The evidence against him was indisputable.
C1 adjective /ɪmˈpæsəbəl/

impassable

Meaning
Impossible to travel along or over.
Example
The road became impassable after the heavy snowfall.
B2 noun /ɪnˈkwaɪəri/ or /ˈɪnkwəri/

inquiry

Meaning
An act of asking for information; an investigation into something.
Example
The committee launched an inquiry into the financial irregularities.
C1 noun /ˌɪnkɑːrˈneɪʃən/

incarnation

Meaning
the embodiment of a deity, spirit, or quality in a physical form
Example
The monk was considered the incarnation of compassion.
C2 verb /ˈɪndjʊˌreɪt/

indurate

Meaning
To harden or make something physically or emotionally tough.
Example
Years of hardship indurated his spirit.
C2 adjective /ɪnˈsɛnseɪt/

insensate

Meaning
lacking physical sensation or empathy; without feeling or sensitivity
Example
The dictator's insensate cruelty shocked the world.
B2 adjective + noun aɪˈdiːəl ɪnˈvaɪrənmənt

ideal environment

Meaning
Perfect or most suitable conditions for growth or development
Example
Winter creates an ideal environment for vegetable growth.
A1 noun /ˈaɪs kriːm/

Ice-cream

Meaning
a frozen sweet dessert made from dairy products, usually served cold
Example
Children love to eat ice-cream on hot summer days.
A1 pronoun /aɪ/

i

Meaning
used by a speaker to refer to himself or herself
Example
I am learning English every day.
B1 noun ˌɪn.stɪˈtjuː.ʃən

institution

Meaning
An organization founded and united for a specific purpose; an established law, practice, or custom.
Example
Institutions play a crucial role in governance.
A1 preposition /ˈɪntuː/

into

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

indecorous

Meaning
Not in keeping with good taste and propriety; improper.
Example
His indecorous behavior shocked the audience.
B2 noun /ɪmˈpɒlɪtnəs/

impoliteness

Meaning
lack of good manners or courtesy; rude behavior
Example
His impoliteness towards the guests shocked everyone.
C1 adjective /ˌɪnədˈmɪsəbl̩/

inadmissible

Meaning
Not allowed, especially as evidence in a court of law.
Example
The judge ruled the evidence inadmissible.
B1 adjective /ɪnkəˈrɛkt/

incorrect

Meaning
not correct or accurate
Example
The information you provided was incorrect.
C1 adjective /ɪnˈsɛnsəbl/

insensible

Meaning
Unconscious; unaware of or indifferent to something.
Example
He was insensible to the cold as he lay in the snow.
B2 verb /ɪtʃ/

itch

Meaning
to feel an urge to scratch; to have a restless desire
Example
My skin itches from the mosquito bites.
C1 adjective /ɪnˈɔːdəbl/

inaudible

Meaning
Unable to be heard.
Example
Her voice was almost inaudible over the noise.
B2 verb /ɪnˈdʌldʒ/

indulge

Meaning
to allow oneself to enjoy something enjoyable, often excessively
Example
He indulged in a piece of chocolate cake after dinner.
B1 adjective /ɪˈnɪʃəl/

initial

Meaning
Existing or occurring at the beginning.
Example
Her initial reaction was one of surprise.
C1 noun /ɪˌluːmɪˈneɪʃən/

illumination

Meaning
the act of lighting something or making something clear
Example
The street was filled with bright illumination from the lamps.
B2 noun /ˌɪnsɪˈkjʊərɪti/

insecurity

Meaning
lack of confidence or assurance; a state of uncertainty or vulnerability
Example
Her insecurity made her doubt her abilities despite her experience.
C2 noun /ɪnˈvaɪtər/

invitor

Meaning
a person who invites someone to an event, meeting, or place
Example
The invitor greeted all the guests warmly at the entrance.
C1 verb /ˈɪnkjʊˌbeɪt/

incubate

Meaning
to keep eggs, cells, or organisms at the right conditions for development
Example
The hen will incubate the eggs until they hatch.
C2 adjective /ˈɪnmoʊst/

inmost

Meaning
Situated at the very heart or deepest part; most private or secret.
Example
She revealed her inmost thoughts to her closest friend.
C1 adjective /ɪˈrɛfjʊtəbəl/

Irrefutable

Meaning
impossible to deny or disprove; undeniable
Example
The evidence against him was irrefutable.
B2 adjective /ɪnˈdɪf.ər.ənt/

indifferent

Meaning
having no particular interest or concern; not caring one way or another
Example
She was indifferent to the outcome of the match.
B2 noun /ɪnˈfɪnɪti/

infinity

Meaning
A concept describing something without any limit or end.
Example
The universe seems to stretch into infinity.
C1 adjective /aɪˈdɪlɪk/

idyllic

Meaning
Like an idyll; extremely happy, peaceful, or picturesque.
Example
They enjoyed an idyllic vacation by the sea.
C2 adjective /ˌɪndaɪˈdʒestəbəl/

Indigestible

Meaning
difficult or impossible to digest; hard to process in the stomach
Example
The old bread became hard and indigestible.
C2 noun /ˌɪntərˈsɛʃən/

intercession

Meaning
the act of intervening or pleading on behalf of another person
Example
The prisoner was released due to the intercession of influential leaders.
C2 adjective /ɪˈrɛfrəɡəbəl/

irrefragable

Meaning
Impossible to refute, deny, or break
Example
The lawyer presented irrefragable evidence that proved his client’s innocence.
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.
B2 noun /ɪnˈdʌstriəl ˌrɛvəˈluːʃən/

Industrial Revolution

Meaning
The rapid development of industry that occurred in Britain in the late 18th and 19th centuries, brought about by the introduction of machinery and characterized by the use of steam power and the growth of factories.
Example
The Industrial Revolution marked a shift in production processes.
C1 adjective /ˌɪnədˈvɜːrtənt/

inadvertent

Meaning
Not resulting from or achieved through deliberate planning; unintentional.
Example
Her inadvertent mistake caused a delay in the project.
B1 noun /ɪmˈprɛʃən/

impression

Meaning
an idea, feeling, or opinion about something or someone
Example
The book gave me a good first impression.
B1 verb /ɪnˈstɔːl/

install

Meaning
To place or fix equipment or software so it is ready for use.
Example
He installed the new software on his computer.
C1 adjective /ɪnˈflæməˌtɔːri/

inflammatory

Meaning
causing inflammation in the body; arousing anger, hostility, or strong emotion
Example
His inflammatory speech triggered protests across the city.
C1 adjective /ɪˈnænɪmət/

inanimate

Meaning
not alive, especially not in the manner of animals and humans; lifeless
Example
The museum was full of inanimate objects from ancient times.
C1 adjective /ɪnˈkwɪzɪtɪv/

inquisitive

Meaning
Curious or eager to learn and ask questions.
Example
The inquisitive child asked endless questions about the stars.
C2 noun /aɪˈkɒnəklæst/

iconoclast

Meaning
A person who attacks or criticizes cherished beliefs, traditions, or institutions.
Example
He was known as an iconoclast who challenged old traditions.
C1 verb /ˈɪrɪˌɡeɪt/

irrigate

Meaning
to supply water to land or crops; to wash out a wound with water
Example
Farmers irrigate their fields during dry seasons.
C1 adjective /ɪˈrɛpərəbəl/

Irreparable

Meaning
impossible to repair or fix; permanent damage that cannot be undone
Example
The accident caused irreparable damage to his spine.
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 adjective ɪˈluː.sər.i

illusory

Meaning
Based on illusion; not real although seeming to be.
Example
His sense of security was entirely illusory.
C1 noun /ˈaɪsətəʊp/

isotope

Meaning
Atoms of the same element with equal number of protons but different numbers of neutrons.
Example
Carbon-14 is a radioactive isotope used in dating fossils.
C1 noun/verb /ˈɪnsɛns/

incense

Meaning
a substance burned for its sweet smell (noun); to make very angry (verb)
Example
The smell of incense filled the temple, but his rude words incensed her.
C1 adjective /ɪˈniː.bri.eɪ.tɪd/

inebriated

Meaning
under the influence of alcohol; drunk
Example
He stumbled into the room completely inebriated.
C2 adjective /ˌɪn.ɪˈlʌk.tə.bəl/

ineluctable

Meaning
Impossible to avoid or escape; inevitable.
Example
Death is an ineluctable part of human existence.
C1 adverb, adjective /ˌɪnkɑːɡˈniːtoʊ/

incognito

Meaning
In disguise or with one's identity concealed.
Example
The celebrity traveled incognito to avoid the paparazzi.
C1 adjective /ˈɪntrɪkət/

intricate

Meaning
very detailed, complex, and difficult to understand
Example
The artist created an intricate pattern on the wall.
B2 verb ˈɪmplɪmentɪd

implemented

Meaning
Put a decision or plan into effect; carried out or executed.
Example
The master plans were partially implemented.
C1 adjective /ˌɪməˈtɪəriəl/

immaterial

Meaning
Not important or relevant; lacking physical substance.
Example
The judge ruled that the argument was immaterial to the case.
C1 verb /ɪnˈdaɪt/

indict

Meaning
to formally accuse someone of committing a serious crime
Example
The grand jury decided to indict the politician for corruption.
C1 noun /ɪnˈhɛrɪtər/

inheritor

Meaning
a person who receives money, property, or a title when someone dies
Example
She became the inheritor of her family's estate.
A2 adverb /ɪnˈstɛd/

instead

Meaning
As an alternative or substitute.
Example
She didn’t buy the dress; instead, she chose a pair of shoes.
A2 adjective /ɪnˈtɛlɪdʒənt/

intelligent

Meaning
Having or showing high mental capacity, quick to learn and understand.
Example
She is one of the most intelligent students in the class.
B2 noun ˌɪn.stəˈleɪ.ʃən

installation

Meaning
The action or process of installing someone or something, or of being installed.
Example
The installation of the submarine cable is almost complete.
B2 verb /ɪnˈstrʌkt/

instruct

Meaning
to teach; to give directions
Example
The teacher instructed the students carefully.
A2 noun /ˈɪntəvjuː/

interview

Meaning
A meeting of people face to face, especially for consultation.
Example
The interview was conducted in a calm and professional manner.
C1 adjective /ˌɪn.dɪˈspen.sə.bəl/

indispensable

Meaning
Absolutely necessary, essential
Example
Water is indispensable for human survival.