indomitable
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C2 adjective ɪnˈdɒm.ɪ.tə.bəl

indomitable

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

inadvertence

Meaning
Failure to pay attention; carelessness.
Example
The error happened through sheer inadvertence.
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 adjective /ɪnˈkɒntɪnənt/

incontinent

Meaning
lacking control over urination or defecation; lacking self-restraint
Example
The patient was incontinent after surgery.
C2 adjective /ˈɪl bred/

Ill-bred

Meaning
lacking good manners; rude; showing poor upbringing
Example
His ill-bred behavior shocked everyone at the dinner party.
C2 adjective /ɪnˈdjuːbɪtəbl/

indubitable

Meaning
Impossible to doubt; unquestionable.
Example
It is indubitable that hard work leads to success.
C2 verb ˈɪn.kʌl.keɪt

inculcate

Meaning
Instill an attitude, idea, or habit by persistent instruction; to teach and impress by frequent repetitions.
Example
Parents should inculcate good values in their children.
C2 noun /ɪnˌtɜːrpəˈleɪʃən/

interpolation

Meaning
The act of inserting something into a text or estimating values within a sequence of data.
Example
The scientist used interpolation to predict the missing data points.
C2 adjective /ˌɪmpɪˈkjuːniəs/

impecunious

Meaning
Having little or no money; poor.
Example
He grew up in an impecunious family.
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 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 adjective /ˌɪm.pəˈfɛk.tə.bəl/

imperfectible

Meaning
Incapable of being made perfect or complete.
Example
Some human qualities are considered imperfectible.
C2 adjective /ɪnˈkɒrɪdʒəbəl/

incorrigible

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

incontrovertible

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

ingratiating

Meaning
Charming or flattering in a way intended to gain favor.
Example
His ingratiating smile made everyone trust him quickly.
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 /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 verb /ɪmˈpeɪl/

impale

Meaning
to pierce or fix something with a sharp object
Example
The knight was impaled by the enemy’s spear.
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 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.
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 /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 adjective /ɪnˈsɛnʃənt/

insentient

Meaning
Lacking perception, consciousness, or sensation.
Example
The rock is an insentient object with no awareness.
C2 noun /ˈaɪsinəs/

iciness

Meaning
The state of being cold in manner or temperature.
Example
There was a distinct iciness in his voice.
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 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 /ɪˈrɛfrəɡəbəl/

irrefragable

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

illiberality

Meaning
The quality of being illiberal; lack of tolerance or generosity.
Example
The illiberality of the new laws alarmed the citizens.
C2 noun /ɪmˈpɒs.tʃər/

Imposture

Meaning
the practice of deceiving others by pretending to be someone else; fraudulent deception
Example
The elaborate imposture lasted for months before investigators uncovered the truth.
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 /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 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.
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 /ˌɪnkænˈdɛsəns/

incandescence

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

importune

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

isothermal

Meaning
Having or maintaining equal or constant temperature.
Example
The experiment was conducted under isothermal conditions.
C2 adjective /ɪnˈɛksərəbl/

inexorable

Meaning
Impossible to stop or prevent; relentless.
Example
The inexorable rise of technology is changing every aspect of life.
C2 adjective /ˌɪrɪˈprəʊtʃəbl̩/

irreproachable

Meaning
Beyond criticism; faultless.
Example
The judge was known for his irreproachable integrity.
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 /ɪnˈvaɪələbl/

inviolable

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

indite

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

infinitesimal

Meaning
Extremely small in size or amount; so tiny as to be almost negligible.
Example
The error was so infinitesimal that it didn’t affect the results.
C2 verb /ɪˈluːmɪn/

illumine

Meaning
to light up or make clear
Example
The rising sun illumined the mountain peaks.
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 adjective /ˌɪnsəˈprɛsəbl/

insuppressible

Meaning
That cannot be suppressed or restrained.
Example
She had an insuppressible urge to laugh during the ceremony.
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 /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 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 /ˈɪŋkʌlpeɪt/

inculpate

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

infernal

Meaning
relating to hell; extremely troublesome or annoying
Example
The workers complained about the infernal noise from the construction site.
C2 adjective /ɪˈnjʊərd/

inured

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

incombustible

Meaning
Not capable of catching fire or burning.
Example
This material is incombustible and safe for construction.
C2 adjective /ɪmˈpælpəbəl/

impalpable

Meaning
unable to be felt by touch; difficult to grasp or understand
Example
There was an impalpable sense of fear in the room.
C2 noun /ɪˈmɒdəsti/

immodesty

Meaning
lack of modesty or decency; behavior or attitude that is overly bold or improper
Example
The article was criticized for its tone of immodesty.
C2 adjective /ɪmˈpɑːlɪtɪk/

impolitic

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

interstice

Meaning
a small space that lies between things
Example
Light filtered through the narrow interstices of the wall.
C2 verb /ɪnˈveɪɡəl/

inveigle

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

indubitably

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

importunate

Meaning
Persistent to the point of annoyance or intrusion
Example
The importunate salesman kept calling despite repeated refusals.
C2 adjective/noun /ɪnˈkɑːrnədiːn/

incarnadine

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

incapacitate

Meaning
to deprive someone or something of the ability or strength to function
Example
The severe injury incapacitated the player for the rest of the season.
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.
C2 noun /ˌɪn.strəˈmɛn.təl.ɪst/

instrumentalist

Meaning
A person who plays a musical instrument.
Example
The instrumentalist played a beautiful solo on the violin.
C2 verb /ɪnˈɡreɪʃiˌeɪt/

ingratiate

Meaning
To gain favor or approval by deliberate effort, often in a flattering way.
Example
She tried to ingratiate herself with her boss by complimenting him often.
C2 adjective /ɪnˈsuːpərəbl/

insuperable

Meaning
Impossible to overcome or surpass.
Example
The team faced insuperable challenges during the expedition.
C2 adjective /ˌɪnæprɪˈhɛnsəbl/

inapprehensible

Meaning
not understandable; incomprehensible
Example
The concept was so abstract that it seemed inapprehensible to most students.
C2 noun /ɪnˈkɒnstənsi/

inconstancy

Meaning
The quality of changing frequently or being unreliable.
Example
The inconstancy of the weather makes planning difficult.
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 /ˌɪnɪˈsɛnʃəl/

inessential

Meaning
not necessary or important; not essential
Example
The report removes all inessential details to stay focused.
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 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 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 /ɪnˈtɛnʃən/

intension

Meaning
The internal content of a concept; the set of attributes implied by a word or phrase.
Example
The intension of the word 'dog' includes being a mammal and domesticated.
C2 adjective /ˌɪnkɔːrˈpɔːriəl/

incorporeal

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

insipid

Meaning
lacking flavor, interest, or excitement; dull
Example
The soup was insipid and needed more seasoning.
C2 noun /ɪnˈtræn.sɪ.dʒəns/

intransigence

Meaning
Refusal to change one's views or to agree about something.
Example
The negotiations failed due to the intransigence of both parties.
C2 noun /ˈɪrɪtənsi/

irritancy

Meaning
the quality or state of causing irritation; legal or formal invalidation
Example
The constant noise became an irritancy to the neighbors.
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 adjective /ɪˈrɛzəluːt/

irresolute

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

impermissible

Meaning
Not permitted or allowed.
Example
Such behavior is impermissible in the workplace.
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.
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 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 /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.
C2 adjective /ɪnˈæpt/

Inapt

Meaning
not suitable; inappropriate; unfit
Example
His comment was inapt for the formal meeting.
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 verb /aɪˈtɪnəˌreɪt/

itinerate

Meaning
To travel from place to place, usually for the purpose of work or preaching.
Example
The missionary itinerated throughout the region to spread the message.
C2 verb /ɪmˈpjuːn/

impugn

Meaning
to dispute the truth, validity, or honesty of a statement or motive
Example
The lawyer tried to impugn the credibility of the witness.
C2 adjective /ˌɪntərˈniːsaɪn/

internecine

Meaning
Relating to conflict within a group, often causing mutual destruction.
Example
The internecine conflict weakened the organization from within.
C2 adjective /ɪmˈprɛɡnəbl̩/

impregnable

Meaning
Unable to be captured, broken into, or defeated.
Example
The fortress was considered impregnable by the enemy.
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 verb /ɪˈmjʊər/

immure

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

innuendo

Meaning
An allusive or oblique remark or hint, typically a suggestive or disparaging one.
Example
The manager's innuendo was directed towards his competitor.
C2 adjective /ɪnˈvɛtərət/

inveterate

Meaning
having a long-established habit, activity, or interest that is unlikely to change
Example
He is an inveterate reader who spends hours in the library every day.
C2 adjective /ˌaɪ.kə.nəˈklæs.tɪk/

iconoclastic

Meaning
Characterized by attacking or rejecting cherished beliefs, traditions, or established values.
Example
Her iconoclastic views challenged the conventional wisdom of the industry.
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 /ˌɪməˈmɔːriəl/

immemorial

Meaning
Extending back beyond memory or record; ancient.
Example
The tradition has been followed since time immemorial.
C2 noun /ˌɪmprəˈpraɪəti/

impropriety

Meaning
Failure to observe standards of honesty or modesty; improper behavior.
Example
The politician was accused of financial impropriety.
C2 noun /ˈɪnsələns/

insolence

Meaning
rude or disrespectful behavior
Example
The teacher was shocked by the student's insolence.
C2 noun /ˈɪnˌɡreɪt/

ingrate

Meaning
An ungrateful person; someone who shows no appreciation.
Example
He worked hard for his friend, but the ingrate never thanked him.
C2 verb ɪmˈbaɪb

imbibe

Meaning
Absorb or assimilate ideas or knowledge. To drink or take in.
Example
He tried to imbibe the wisdom from his mentor.
C2 adjective /ɪnˈkɒnstənt/

inconstant

Meaning
frequently changing; not consistent or dependable
Example
His inconstant moods made it difficult to work with him.
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 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 verb /ɪˈnjʊər/

inure

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

irradiance

Meaning
the quality of shining brightly; the intensity of light falling on a surface
Example
The irradiance of the sun at noon was overwhelming.
C2 adjective /ˌaɪdəˈlɑːtrɪəs/

idolatrious

Meaning
Excessively devoted or reverent towards idols or false gods.
Example
The ancient tribe was known for its idolatrious practices.
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 /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 adjective /ˌɪnkoʊˈɜːrsəbl̩/

incoercible

Meaning
Not capable of being forced, compelled, or restrained.
Example
Her incoercible spirit inspired others to fight for justice.
C2 adjective /ɪnˈɡlɔːriəs/

inglorious

Meaning
Causing shame or disgrace; not bringing honor or glory.
Example
The army suffered an inglorious defeat.
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 verb /ɪnˈtɜːr/

inter

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

insupportable

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

inexpert

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

imbroglio

Meaning
An extremely confused, complicated, or embarrassing situation.
Example
The political imbroglio lasted for months without resolution.