icily
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C2 adverb /ˈaɪsɪli/

icily

Meaning
In a very cold, unfriendly, or hostile manner.
Example
She replied icily to his question.
C2 noun /ˌɪmpəˈtjuːəsəti/

impetuosity

Meaning
The quality of being rash or impulsive.
Example
His impetuosity often got him into trouble.
C2 noun /ˈɪkθiəˌsɔːrz/

ichthyosaurs

Meaning
Extinct marine reptiles that resembled fish and dolphins, dominant during the Mesozoic era.
Example
Ichthyosaurs were swift predators of the ancient seas.
C2 noun /ˈænʒənuː/

ingenue

Meaning
an innocent, naïve young woman, especially as represented in literature or theater
Example
She played the role of the ingénue in the play with great charm.
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 verb /aɪˈdɒləˌtraɪz/

idolatrize

Meaning
To worship idols; to regard with excessive devotion or admiration.
Example
They began to idolatrize the statue as a deity.
C2 adverb /ˌɪnəzˈmʌtʃ/

inasmuch

Meaning
To the extent that; considering that.
Example
Inasmuch as you are their teacher, you should guide them carefully.
C2 adjective /ˈɪmənənt/

immanent

Meaning
existing or operating within; inherent
Example
He believed that moral values are immanent in human nature.
C2 noun /ˈaɪdɪl/

idyll

Meaning
An extremely happy, peaceful, or picturesque episode or scene, often idealized.
Example
Their honeymoon was an idyll on a tropical island.
C2 noun /ɪnˈtɒksɪkənt/

intoxicant

Meaning
a substance, especially alcohol or a drug, that causes intoxication
Example
Alcohol is the most commonly used intoxicant in many cultures.
C2 noun /ˌɪn.trəˈɡreʃ.ən/

introgression

Meaning
The transfer of genetic information from one species to another through repeated backcrossing.
Example
Introgression plays a significant role in plant breeding.
C2 adjective /ɪnˈvɪdiəs/

invidious

Meaning
likely to arouse resentment, envy, or anger in others
Example
The manager's invidious remarks created tension among the employees.
C2 adjective /ɪˈrɛzəluːt/

irresolute

Meaning
uncertain or indecisive; lacking determination
Example
He stood irresolute at the crossroads, unsure which path to take.
C2 adjective /ˌɪn.ɪˈlʌk.tə.bəl/

ineluctable

Meaning
Impossible to avoid or escape; inevitable.
Example
Death is an ineluctable part of human existence.
C2 noun /ˈɪnroʊd/

inroad

Meaning
An advance or significant progress, often at the expense of something else.
Example
The company made significant inroads into the mobile market.
C2 noun /ɪˈrɛvərəns/

irreverence

Meaning
a lack of respect for people or things that are generally taken seriously
Example
His jokes about religion showed irreverence to the sacred traditions.
C2 adjective ɪˈnɛfəbl

ineffable

Meaning
Too great or extreme to be expressed or described in words.
Example
The beauty of the landscape was ineffable.
C2 verb /ˈɪŋkʌlpeɪt/

inculpate

Meaning
To blame or accuse someone of wrongdoing.
Example
The evidence seemed to inculpate the suspect in the crime.
C2 verb /ˌɪntərˈmɪt/

intermit

Meaning
To suspend or stop for a time; to pause intermittently.
Example
The rain would intermit and then start again.
C2 noun /ˈɪn.tɪ.ɡreɪ.tɪv dɪˈpləʊ.mə.si/

integrative diplomacy

Meaning
A diplomatic approach that seeks to combine or coordinate different elements, interests, or parties into a unified whole.
Example
Integrative diplomacy strengthens alliances.
C2 adjective /ɪnˈkɒrɪdʒəbəl/

incorrigible

Meaning
incapable of being corrected, improved, or reformed
Example
He is an incorrigible optimist who never loses hope.
C2 adjective ɪnˈfiː.zə.bəl

infeasible

Meaning
Not possible to do easily or conveniently; impracticable.
Example
Restoring the forest may become infeasible if destruction continues.
C2 adjective /ɪnˈkɒŋɡruənt/

incongruent

Meaning
Not in harmony or keeping with the surroundings or other aspects.
Example
His casual outfit looked incongruent at the formal dinner.
C2 adjective /ˌɪndɪˈsɜːrnəbl/

indiscernible

Meaning
Impossible or difficult to see, notice, or distinguish.
Example
The difference between the two shades was almost indiscernible.
C2 noun /ɪmˈprɑːvɪdəns/

improvidence

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

inopportune

Meaning
Happening at a bad or inconvenient time.
Example
His call came at the most inopportune moment.
C2 noun /ˌɪmprɪˈmɑːtər/

imprimatur

Meaning
An official license or approval, especially to publish a book.
Example
The book was released with the official imprimatur of the church.
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.
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 /ɪnhɑːrˈmoʊniəs/

Inharmonious

Meaning
lacking harmony; discordant in sound; not in tune
Example
The inharmonious sounds from the broken piano made everyone cover their ears.
C2 noun /ɪmˈpʌlʃən/

impulsion

Meaning
a strong urge or drive to act; the act of impelling
Example
His impulsion to travel made him leave his job suddenly.
C2 noun /ɪnˈfrækʃən/

infraction

Meaning
A violation or breach of a rule, law, or agreement.
Example
The student was punished for a minor infraction of the school rules.
C2 adjective /ˌɪntərˈlɒkjətəri/

interlocutory

Meaning
Given during the course of a legal action, not final but temporary or provisional.
Example
The judge issued an interlocutory order to maintain the status quo until the hearing.
C2 adjective /aɪˈdɒlətrəs/

idolatrous

Meaning
Excessively admiring or worshipping someone or something as an idol.
Example
The king was criticized for his idolatrous devotion to wealth.
C2 verb /ˌɪntərˈsiːd/

intercede

Meaning
to act or plead on behalf of someone in difficulty or trouble; to intervene between parties to help resolve a dispute
Example
She interceded with the teacher to give her brother another chance.
C2 noun /ɪˌledʒ.əˈbɪl.ə.ti/

Illegibility

Meaning
the quality of being impossible or difficult to read; unclear writing or print
Example
The doctor's handwriting was famous for its illegibility among the pharmacy staff.
C2 verb /ˌɪmpɔːrˈtuːn/

importune

Meaning
To ask someone persistently or pressingly for something
Example
The child importuned his mother for a new toy.
C2 noun /ˌɪrɪˈdɛsəns/

iridescence

Meaning
a play of lustrous, changing colors like those of a rainbow
Example
The butterfly's wings shimmered with iridescence.
C2 adjective /ɪmˈpræktɪkəbl/

impracticable

Meaning
Not capable of being carried out or put into practice.
Example
The plan seemed impracticable due to limited resources.
C2 noun /ɪnˈsuːsiəns/

insouciance

Meaning
Casual lack of concern; indifference.
Example
She carried herself with an air of insouciance, unbothered by the challenges ahead.
C2 verb /ɪnˈtɜːr/

inter

Meaning
To bury a dead body in the ground.
Example
They decided to inter the soldier with full honors.
C2 noun /ɪmˈpjuːɪsəns/

impuissance

Meaning
inability to take effective action; helplessness
Example
The government’s impuissance in the face of crisis frustrated the people.
C2 adjective /ɪˈnɪm.ɪ.tə.bəl/

inimitable

Meaning
So good or unusual as to be impossible to copy; unique.
Example
His inimitable writing style made him a literary legend.
C2 adjective /ˌɪnfəˈlɪsɪtəs/

infelicitous

Meaning
not suitable or well chosen; awkward or unfortunate
Example
His infelicitous remark ruined the atmosphere of the meeting.
C2 adjective /ɪnˈvʌlnərəbl/

invulnerable

Meaning
Impossible to harm, damage, or defeat.
Example
The fortress was thought to be invulnerable to attack.
C2 adjective /ɪˈrɛfrəɡəbəl/

irrefragable

Meaning
Impossible to refute, deny, or break
Example
The lawyer presented irrefragable evidence that proved his client’s innocence.
C2 verb /ɪnˈveɪ/

inveigh

Meaning
To speak or write about something with great hostility and criticism.
Example
He inveighed against the corruption in government.
C2 noun /ˌɪnvəˈlɪdɪti/

invalidity

Meaning
the state of being invalid, legally void, or lacking force or validity
Example
The court ruled that the contract suffered from invalidity.
C2 verb /ɪnˈveɪɡəl/

inveigle

Meaning
To persuade someone to do something by deception or flattery.
Example
She inveigled him into signing the contract.
C2 adjective /ɪnˈsɛptɪv/

inceptive

Meaning
Relating to or marking the beginning or initial stage of something.
Example
The inceptive phase of the project was marked by enthusiastic planning.
C2 noun /ˌɪndɛnˈteɪʃən/

indentation

Meaning
A space left at the beginning of a line of text; a notch or deep recess on a surface.
Example
The teacher asked the students to use proper indentation in their essays.
C2 noun /ɪmˈpjuːnɪti/

impunity

Meaning
freedom from punishment or harmful consequences for an action
Example
The dictator ruled with impunity, ignoring international laws.
C2 adjective /ˌɪnkɒntrəˈvɜːtəbl/

incontrovertible

Meaning
impossible to deny or dispute; unquestionable
Example
The evidence was incontrovertible and proved his innocence.
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.
C2 adjective /ˌɪn.trəˈmjʊə.rəl/

intramural

Meaning
Occurring within the walls of a single institution, especially a school or college.
Example
The college organizes intramural sports competitions every semester.
C2 adjective /ɪmˈplækəbl/

implacable

Meaning
unable to be appeased, calmed, or pacified
Example
The soldiers faced an implacable enemy who refused to surrender.
C2 adjective /ɪnˈvaɪələt/

inviolate

Meaning
free from violation, injury, or desecration; kept safe and untouched
Example
The ancient temple remained inviolate for centuries.
C2 adjective /ˌɪntəˈrɒɡətəri/

interrogatory

Meaning
expressed in the form of a question; relating to questioning
Example
The lawyer’s interrogatory tone made the witness uncomfortable.
C2 verb /ɪnˈdɒktrɪˌneɪt/

indoctrinate

Meaning
To teach someone to fully accept a set of beliefs or ideas without question.
Example
The regime tried to indoctrinate the youth with propaganda.
C2 noun /ˈɪntərˌloʊpər/

interloper

Meaning
A person who becomes involved in a situation or place where they are not wanted.
Example
He felt like an interloper at the private family gathering.
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.
C2 verb /ˌɪn.trəˈmɪt/

intromit

Meaning
To insert or introduce something into a place or body.
Example
The doctor carefully intromitted the instrument into the wound.
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 /ˌɪnɔːˈspɪʃəs/

Inauspicious

Meaning
unlucky; showing signs that future success is unlikely; unfavorable
Example
The dark clouds seemed inauspicious for the wedding.
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.
C2 verb /ɪnˈdɛmnɪfaɪ/

indemnify

Meaning
to compensate someone for harm or loss; to secure against future damage or cost
Example
The insurance company agreed to indemnify the client for the damages.
C2 adjective /ɪmˌpɜːrˈsweɪdəbl/

impersuadable

Meaning
not able to be convinced or persuaded
Example
She remained impersuadable despite all our arguments.
C2 noun /ɪmˈpruː.dəns/

Imprudence

Meaning
the quality of being imprudent; lack of care for consequences; recklessness
Example
His financial imprudence led to bankruptcy within just two years.
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.
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 /ɪnˈæpt/

Inapt

Meaning
not suitable; inappropriate; unfit
Example
His comment was inapt for the formal meeting.
C2 noun /ɪnˌtɛl.ɪˈdʒɛntsi.ə/

intelligentsia

Meaning
The group of people engaged in intellectual and cultural pursuits in a society.
Example
The intelligentsia played a key role in shaping public opinion.
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.
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 adjective /ˌɪnsəˈpɔːrtəbl̩/

insupportable

Meaning
Too extreme or difficult to be endured.
Example
The heat was insupportable during the long journey.
C2 adjective /ɪnˈsɛnseɪt/

insensate

Meaning
lacking physical sensation or empathy; without feeling or sensitivity
Example
The dictator's insensate cruelty shocked the world.
C2 verb /ɪˈmjʊər/

immure

Meaning
to confine or enclose someone against their will
Example
The prisoner was immured in a dark cell.
C2 adjective /ɪmˈpɑːlɪtɪk/

impolitic

Meaning
Unwise or imprudent; not showing good judgment.
Example
It would be impolitic to criticize them openly.
C2 adverb /ɪnˈdjuːbɪtəbli/

indubitably

Meaning
Without a doubt; certainly.
Example
She is indubitably the best candidate for the job.
C2 adjective /ˌɪnsəˈluːbriəs/

insalubrious

Meaning
Unhealthy or not conducive to well-being.
Example
They moved out of the insalubrious neighborhood for the sake of their health.
C2 adjective /ˈɪndələnt/

indolent

Meaning
Wanting to avoid activity or exertion; lazy.
Example
The indolent cat slept in the sun all afternoon.
C2 adjective /ɪnˈskruːtəbl̩/

inscrutable

Meaning
impossible to understand or interpret
Example
His inscrutable expression made it hard to know what he was thinking.
C2 noun /ɪmp/

imp

Meaning
a small mischievous devil or sprite; a playful troublemaker
Example
The child was acting like a little imp, hiding his toys everywhere.
C2 adjective /ɪˈlɪmɪtəbl/

illimitable

Meaning
Without limits or bounds.
Example
The universe is often described as illimitable.
C2 verb /ɪnˈdʒɛst/

ingest

Meaning
To take food, drink, or another substance into the body, usually by swallowing.
Example
The patient must ingest the medicine with water.
C2 adjective /ɪnˈklɛmɛnt/

inclement

Meaning
unpleasantly cold, wet, or stormy (usually weather)
Example
The match was canceled due to inclement weather.
C2 adjective /ˌɪnˈekspɜːrt/

inexpert

Meaning
not skilled or experienced; lacking expertise
Example
The inexpert handling of the machine caused several mistakes.
C2 adjective /ɪnˈsɪpɪd/

insipid

Meaning
lacking flavor, interest, or excitement; dull
Example
The soup was insipid and needed more seasoning.
C2 adjective /ɪnˈvaɪələbl/

inviolable

Meaning
never to be broken, dishonored, or violated
Example
Human rights are considered inviolable in modern democracies.
C2 adjective /ˌɪnɪkˈstɛnsəbl/

inextensible

Meaning
Not capable of being stretched or extended.
Example
This rope is made of an inextensible material.
C2 verb /ˌɪmpɔːrˈtuːnd/

importuned

Meaning
asked someone persistently and pressingly for something
Example
She importuned her boss for a raise until he finally gave in.
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 verb /ˌɪntərˈlɒk/

interlock

Meaning
to fit or connect together securely so that two or more things are joined
Example
The gears interlock to ensure smooth movement of the machine.
C2 adjective /ˌɪnɪkˈstrɪkəbl/

inextricable

Meaning
Impossible to separate or escape from.
Example
The two friends shared an inextricable bond.
C2 noun /ˌɪn.ɪˈbraɪ.ə.ti/

inebriety

Meaning
the state of being drunk or intoxicated
Example
His frequent inebriety led to the loss of his job.
C2 adverb /ˌɪnsəʊˈmʌtʃ/

insomuch

Meaning
to such an extent
Example
He was insomuch tired that he could hardly stand.
C2 noun /ɪmˌpɜːrtərbəˈbɪləti/

imperturbability

Meaning
The quality of being calm and not easily disturbed or upset.
Example
Her imperturbability during the crisis impressed everyone.
C2 verb /ɪˈnjʊər/

inure

Meaning
To become accustomed to something, especially something unpleasant.
Example
Soldiers quickly became inured to the harsh conditions.
C2 adjective /ɪˈræsɪbl/

irascible

Meaning
Easily angered; quick-tempered.
Example
His irascible nature often got him into trouble.
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.
C2 adjective/noun /ɪnˈkɑːrnədiːn/

incarnadine

Meaning
a bright crimson or pinkish-red color
Example
The sky turned incarnadine at sunset.
C2 noun /ɪnˈsɪɡniə/

insignia

Meaning
A badge or symbol that shows rank, position, or membership.
Example
The soldier proudly wore the insignia of his regiment.
C2 adjective /ɪˈmɒdərət/

immoderate

Meaning
excessive; beyond reasonable limits
Example
He has an immoderate love for sweets.
C2 adjective /ɪnˈkɒnstənt/

inconstant

Meaning
frequently changing; not consistent or dependable
Example
His inconstant moods made it difficult to work with him.
C2 adjective ɪnˈdɒm.ɪ.tə.bəl

indomitable

Meaning
Impossible to subdue or defeat.
Example
Her indomitable spirit helped her overcome adversity.
C2 adjective /ˌɪndɪˈsɒljʊbl/

indissoluble

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

incorporeal

Meaning
lacking a physical body; not composed of matter; intangible
Example
Ghosts are often described as incorporeal beings.
C2 verb /ɪnˈdaɪt/

indite

Meaning
To write or compose (literary or formal works).
Example
The poet indited a heartfelt sonnet.
C2 noun /ɪnˈɛrənsi/

inerrancy

Meaning
the belief or quality of being free from error; absolute correctness
Example
Some religious groups strongly affirm the inerrancy of their sacred texts.
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 adjective /ɪnˈtɛmpərət/

intemperate

Meaning
Lacking self-control; immoderate, especially in indulgence.
Example
The politician's intemperate remarks caused controversy.
C2 noun /ˌɪn.ʌnˈdeɪ.ʃən/

inundation

Meaning
The act of flooding or overwhelming with water or things.
Example
The town suffered from a severe inundation after the heavy rains.
C2 noun /aɪˈoʊtə/

iota

Meaning
An extremely small amount.
Example
He did not show an iota of fear.
C2 verb /ɪnˈsteɪt/

instate

Meaning
To set up in position, office, or authority.
Example
The board decided to instate her as the new director.
C2 noun /ɪmˌprɒb.əˈbɪl.ə.ti/

Improbability

Meaning
the quality or state of being improbable; unlikely to be true or to happen
Example
The improbability of winning the lottery twice didn't stop her from buying tickets.
C2 noun /ˌɪnkænˈdɛsəns/

incandescence

Meaning
the emission of light from a hot object; brilliance
Example
The incandescence of the candle filled the dark room.
C2 adjective /ˌɪrɪˈdɛsənt/

iridescent

Meaning
showing luminous colors that seem to change when seen from different angles
Example
She wore an iridescent dress that sparkled in the light.
C2 adjective /ˌɪrɪˈfrændʒɪbəl/

irrefrangible

Meaning
Not to be broken, violated, or infringed
Example
The constitution guarantees certain irrefrangible rights to every citizen.
C2 noun /ˈɪd.i.ə.si/

Idiocy

Meaning
extremely stupid behavior or actions; foolishness
Example
The decision to ignore safety protocols was pure idiocy that endangered everyone.
C2 adjective /ˌɪɡ.nəˈmɪn.i.əs/

ignominious

Meaning
Marked by shame, disgrace, or humiliation.
Example
The team suffered an ignominious defeat in the finals.