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C1 adjective, noun /ɪnˈdɪkətɪv/

indicative

Meaning
Serving as a sign or expression of something; in grammar, a mood used to make factual statements.
Example
His tone was indicative of his frustration.
C1 noun /ɪnˈfjuːʒən/

infusion

Meaning
the act of introducing something into another; a drink made by steeping leaves or herbs in liquid
Example
She prepared a calming infusion of chamomile tea.
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.
B1 noun aɪˈdɛntɪti

identity

Meaning
The fact of being who or what a person or thing is; the characteristics determining who or what a person or thing is.
Example
The day reinforces our national identity.
C1 verb /ɪnˈfjʊərieɪt/

infuriate

Meaning
To make someone extremely angry.
Example
His careless remarks infuriated the entire team.
C1 noun ˌɪn.fɪlˈtreɪ.ʃən

infiltration

Meaning
The process of entering or gaining access to an organization or place surreptitiously.
Example
Cybersecurity prevents infiltration into sensitive data.
C2 noun /ˈɪn.fɪ.del/

Infidel

Meaning
a person who does not believe in religion or whose religious beliefs differ from one's own
Example
In historical contexts, crusaders often referred to their enemies as infidels.
B1 adjective /ɪˈliː.ɡəl/

illegal

Meaning
Not allowed by law; unlawful.
Example
It is illegal to drive without a valid license.
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.
C1 noun ɪnˈflɛk.ʃən

inflection

Meaning
The change in pitch or tone of voice when speaking for emphasis.
Example
His inflection kept the audience engaged.
B2 verb /ɪnˈdʒɛkt/

inject

Meaning
To introduce a substance, especially a drug, into the body using a needle.
Example
The nurse will inject the vaccine into the patient's arm.
A2 noun /ɪŋk/

Ink

Meaning
a colored fluid used for writing, drawing, or printing; a dark liquid ejected by cuttlefish
Example
The old fountain pen leaked ink all over his white shirt during the meeting.
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.
B2 adjective /ˌɪnkənˈsɪstənt/

inconsistent

Meaning
Not staying the same throughout; lacking harmony or regularity.
Example
His answers were inconsistent and confusing.
C2 adjective /ɪnˈsɛndiˌɛri/

incendiary

Meaning
designed to cause fires or stir up conflict
Example
The politician’s incendiary remarks angered the crowd.
B2 noun /aɪˌdɛntɪfɪˈkeɪʃən/

identification

Meaning
the process of recognizing or proving who or what someone or something is
Example
You need proper identification to enter the building.
C1 verb /ɪmˈpɒvərɪʃ/

impoverish

Meaning
To make someone poor or reduce the quality or richness of something.
Example
The long war impoverished the entire nation.
C2 adjective /ɪˈnjʊərd/

inured

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

involution

Meaning
a complicated or intricate form or state; in biology, the shrinking of an organ after its function has finished
Example
The story was full of involution, making it hard to follow.
B2 adjective /ɪnˈfɪə.ri.ər/

inferior

Meaning
Of lower quality, rank, or status.
Example
This material is inferior to the one we used before.
C2 noun /ˌɪmprəˈpraɪəti/

impropriety

Meaning
Failure to observe standards of honesty or modesty; improper behavior.
Example
The politician was accused of financial impropriety.
B2 adjective /ˈaɪ.dəl/

Idle

Meaning
lazy; inactive; not working or being used
Example
The factory workers were idle during the strike.
C2 verb /ɪnˈtɜːr/

inter

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

inclined

Meaning
having a tendency or disposition toward something
Example
He is inclined to help those in need.
B2 adjective /ˌɪn.trəˈdʌk.tər.i/

introductory

Meaning
Serving as an introduction; preliminary or preparatory.
Example
The professor gave an introductory lecture on economics.
C1 adjective ɪnɪɡˈzɔːstɪbəl

inexhaustible

Meaning
Unable to be used up or worn out; limitless.
Example
His inexhaustible energy allowed him to work tirelessly on his projects.
C1 adjective /ˈɪnbɔːrn/

Inborn

Meaning
existing from birth; natural; inherent
Example
She has an inborn talent for music.
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 verb /ɪnˈtɒksɪkeɪt/

intoxicate

Meaning
to make someone lose control of their faculties or behavior due to alcohol or drugs
Example
The strong drink quickly intoxicated him.
C1 adjective /ˈɪnsələnt/

insolent

Meaning
showing a rude and arrogant lack of respect
Example
The insolent student refused to follow the teacher's instructions.
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.
C1 adjective /ɪnˈdʌstriəs/

industrious

Meaning
Hardworking and diligent in one's duties.
Example
She is an industrious student who always completes her assignments on time.
B2 noun /ˈɪn.flu.ən.sər/

Influencer

Meaning
A person with the ability to influence potential buyers of a product or service by promoting or recommending the items on social media.
Example
Social media influencers shape consumer preferences.
A2 adjective/noun /ˈɪndiən/

indian

Meaning
Relating to India, its people, or their culture.
Example
She loves Indian food, especially biryani.
B2 noun ˈɪn.deks

index

Meaning
An alphabetical list of names, subjects, etc. with references to the places where they occur, typically found at the end of a book; a sign or measure of something.
Example
An index organizes critical data.
C1 verb /ɪnˈtruːd/

intrude

Meaning
To enter a place or situation where one is not wanted or not invited.
Example
He felt embarrassed to intrude on their private conversation.
C1 adjective /ˌɪnhɒˈspɪtəbl/

inhospitable

Meaning
Harsh and difficult to live in; unfriendly or unwelcoming to guests.
Example
The desert is an inhospitable environment for most plants.
B1 verb /ɪmˈprɛs/

impress

Meaning
to cause someone to feel admiration or respect
Example
Her speech managed to impress the audience.
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.
C1 noun /ˈɪntərˌpleɪ/

interplay

Meaning
The way in which two or more things have an effect on each other.
Example
The interplay between culture and technology shapes modern life.
C1 adjective /ɪnˈtɜːrmənəbl/

interminable

Meaning
Seemingly endless; having no apparent end.
Example
The meeting felt interminable and exhausting.
C1 adjective /ɪnˈveɪsɪv/

invasive

Meaning
Tending to spread harmfully, intruding aggressively, or encroaching beyond proper boundaries.
Example
The doctor explained that the procedure was minimally invasive.
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.
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.
A2 preposition /ɪnˈkluːdɪŋ/

including

Meaning
used to show that someone or something is part of a larger group
Example
Many people attended the event, including students and teachers.
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 adjective /ɪnˈeɪliənəbl/

inalienable

Meaning
Unable to be taken away or transferred; absolute and permanent.
Example
Freedom of speech is an inalienable right.
B1 verb /ɪnˈsɪst/

insist

Meaning
to demand firmly; to state persistently
Example
He insisted on paying the bill.
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.
C2 noun /ˈɪndɪkənt/

indicant

Meaning
Something that indicates or points to a fact or condition.
Example
High fever is often an indicant of infection.
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.
B2 adjective /ˈaɪsi/

Icy

Meaning
extremely cold; covered with ice; unfriendly or hostile
Example
The icy wind made everyone shiver.
B2 noun ˌɪr.ɪˈɡeɪ.ʃən

irrigation

Meaning
The artificial application of water to land or soil.
Example
Irrigation systems improve crop yields in dry regions.
B2 verb aɪˈdɛntɪfaɪd

identified

Meaning
To recognize or establish who or what someone or something is.
Example
The root causes of the issue need to be identified.
B2 adjective /ˌɪntərˈmiːdiət/

intermediate

Meaning
Coming between two things in time, place, or order; in the middle level or stage.
Example
She is taking an intermediate-level French course.
B2 verb ˈɪmplɪment

implement

Meaning
To put a decision or plan into effect; to execute or apply.
Example
Implementing educational policies is essential for progress.
B1 adjective /ˈɪnər/

inner

Meaning
Located inside or closer to the center; relating to one’s thoughts or feelings.
Example
She shared her inner thoughts with her best friend.
B1 noun /ˌɪntərˈækʃən/

interaction

Meaning
The process of people or things acting upon or influencing each other.
Example
The teacher encouraged more interaction between students.
B2 adjective /ɪmˈpɜːrfɪkt/

imperfect

Meaning
Not perfect; having faults or flaws.
Example
The painting was beautiful despite being imperfect.
C2 adjective /ˌɪn.trəˈsɛl.jʊ.lər/

intracellular

Meaning
Located or occurring within a cell.
Example
The drug works by targeting intracellular bacteria.
B2 verb /ɪnˈherɪt/

inherit

Meaning
to receive money, property, or characteristics from someone when they die; to acquire from predecessors
Example
She inherited her grandmother's house.
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.
C1 noun /ˌɪn.trəˈvɜːr.ʒən/

introversion

Meaning
The tendency to be inward-looking and shy, preferring solitary activities.
Example
Her introversion made it difficult for her to enjoy large parties.
C1 adverb /ˈɪnwərdli/

inwardly

Meaning
In the mind or spirit; not outwardly visible.
Example
She smiled outwardly but inwardly she was worried.
C2 noun /ˌɪnˌkeɪpəˈbɪləti/

incapability

Meaning
lack of ability or power to do something; inability or incompetence
Example
His incapability to manage the team led to serious problems.
B2 adverb /ɪnˈɛvɪtəbli/

inevitably

Meaning
in a way that cannot be avoided or prevented
Example
Inevitably, the team faced challenges during the project.
B2 noun /ˈɪn.vɔɪs/

Invoice

Meaning
a list of goods sent or services provided, with a statement of the sum due for these
Example
The company sent an invoice for the office supplies delivered last week.
A1 noun /aɪs/

Ice

Meaning
water that has frozen and become solid
Example
The ice in my drink melted quickly in the hot weather.
A2 adjective /ˈɪntrəstɪd/

interested

Meaning
Showing curiosity or concern about something.
Example
She is very interested in learning new languages.
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.
C1 adjective /ˈaɪərnˌklæd/

ironclad

Meaning
impossible to change, break, or dispute; very strong and firm
Example
The company had an ironclad contract with its suppliers.
C1 adjective /ɪˈnɒkjuəs/

innocuous

Meaning
Not harmful or offensive.
Example
His remark was completely innocuous and not meant to offend anyone.
C1 adjective /ɪnˈvæljʊəbl/

invaluable

Meaning
Extremely useful or indispensable.
Example
Her advice proved invaluable to my success.
B2 noun /ɪnˈfɪnɪti/

infinity

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

institutionalize

Meaning
to establish something as a formal institution, custom, or practice
Example
The government seeks to institutionalize environmental protection.
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 noun /ˌɪnsɪɡˈnɪfɪkəns/

insignificance

Meaning
The quality of being unimportant or trivial.
Example
He felt a sense of insignificance in the vast universe.
A2 verb /ɪnˈvaɪtɪd/

invited

Meaning
asked someone formally or politely to go somewhere or do something
Example
She was invited to the party.
C1 verb /ɪmˈploʊd/

implode

Meaning
To collapse or burst inward violently.
Example
The old building imploded during the demolition.
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 ɪnˈdɒm.ɪ.tə.bəl

indomitable

Meaning
Impossible to subdue or defeat.
Example
Her indomitable spirit helped her overcome adversity.
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.
C1 adjective /ɪnˈdiːsənt/

indecent

Meaning
not conforming to accepted standards of behavior or morality; improper or offensive
Example
He was warned for making an indecent remark during the meeting.
C1 adjective /ˌɪnəˈtɛntɪv/

inattentive

Meaning
not paying attention; lacking focus or concentration
Example
The inattentive student missed several important instructions.
C2 verb /ɜːrk/

irk

Meaning
to annoy or irritate someone
Example
It irks me when people are late without calling.
B2 adjective /ˈɪn.tɪ.mət/

Intimate

Meaning
close in friendship; private and personal; detailed knowledge
Example
They have an intimate friendship that has lasted for decades.
C1 noun /ˈɪd.i.əm/

idiom

Meaning
A group of words whose meaning is different from the meanings of the individual words.
Example
The idiom 'break the ice' means to start a conversation in a friendly way.
C1 noun ˌɪntədɪˈpɛndənsi

interdependency

Meaning
The dependence of two or more people or things on each other.
Example
The interdependency of the countries led to greater cooperation.
B2 adjective /ˈɪrɪteɪtɪd/

irritated

Meaning
feeling annoyed or impatient; having inflamed or sore physical condition
Example
She felt irritated by the constant noise outside her window.
C2 verb /ɪˈnjʊər/

inure

Meaning
To become accustomed to something, especially something unpleasant.
Example
Soldiers quickly became inured to the harsh conditions.
C1 adjective /ɪnˈɛlɪdʒəbəl/

Ineligible

Meaning
not qualified or entitled to participate or be chosen; unsuitable
Example
Students with poor grades are ineligible for the scholarship program.
B1 noun ɪnˈtel.ɪ.dʒəns

intelligence

Meaning
The ability to learn, understand, and think in a logical way about things
Example
Intelligence is key in AI development.
C2 adjective /aɪˈtɪnərənt/

itinerant

Meaning
Traveling from place to place, especially for work or duty.
Example
The itinerant teacher moved from village to village to educate children.
B2 adjective /ɪmˈprɒp.ər/

Improper

Meaning
inappropriate; incorrect; not suitable
Example
It would be improper to discuss personal matters in a business meeting.
C2 adjective /ɪmˈpɔːrtʃənət/

importunate

Meaning
Persistent to the point of annoyance or intrusion
Example
The importunate salesman kept calling despite repeated refusals.
C1 adjective /ɪnˈdetɪd/

Indebted

Meaning
owing money or gratitude to someone; obligated; grateful
Example
I am deeply indebted to my teacher for all her guidance.
C1 noun ɪnˌten.sɪ.fɪˈkeɪ.ʃən

intensification

Meaning
The process of becoming or making something more intense or extreme.
Example
The intensification of climate change requires urgent action.
B1 noun ˈɪn.də.stri

industry

Meaning
Economic activity concerned with the processing of raw materials and manufacture of goods in factories.
Example
The industry focuses on luxury experiences.
C2 adjective /ˌɪɡ.nəˈmɪn.i.əs/

ignominious

Meaning
Marked by shame, disgrace, or humiliation.
Example
The team suffered an ignominious defeat in the finals.
A2 noun /ˌɪnvɪˈteɪʃən/

invitation

Meaning
a written or spoken request to attend an event or to participate in something
Example
She sent me an invitation to her wedding.
A1 noun /ˈɪntənet/

internet

Meaning
A global computer network providing a variety of information and communication facilities.
Example
The internet has revolutionized the way we access information.
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.
C1 noun /ˈɪŋklɪŋ/

inkling

Meaning
A slight idea, hint, or suspicion about something.
Example
She had an inkling that he was planning a surprise.
C1 adjective /ɪˈnɛpt/

inept

Meaning
lacking skill or ability; clumsy or incompetent
Example
His inept handling of the situation made it worse.
C1 verb /ɪmˈpɑːrt/

impart

Meaning
to make information known; to bestow or communicate
Example
The teacher imparted valuable knowledge to her students.
B1 noun /ˈɪnkʌm/

income

Meaning
money received for work or through investments
Example
His monthly income is enough to support his family.
C1 adjective /ɪnˈfriːkwənt/

infrequent

Meaning
Happening rarely or not often.
Example
He made infrequent visits to his hometown after moving abroad.
B2 adjective /ˈɪmpæktfʊl/

impactful

Meaning
Having a major impact or effect; powerful and forceful.
Example
Her impactful speech moved the audience to take action.
B2 noun /ɪnˈsɪstəns/

insistence

Meaning
the act of demanding something firmly or repeatedly
Example
At his insistence, we stayed longer.
C2 adjective /ˌɪnˌɑːpərˈtuːn/

inopportune

Meaning
Happening at a bad or inconvenient time.
Example
His call came at the most inopportune moment.
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.
B2 verb /ɪnˈsɜːrt/

insert

Meaning
to put or place something into something else
Example
Please insert the key into the lock.
C2 adjective /ɪnˈtɛsteɪt/

intestate

Meaning
Having died without leaving a valid will.
Example
She died intestate, so her assets were distributed by law.
B1 noun /ɪnˈstrʌkʃənz/

instructions

Meaning
Detailed information on how something should be done or operated.
Example
Please follow the instructions on the box.
B1 adverb /ɪˈnɪʃəli/

initially

Meaning
At the beginning; at first.
Example
Initially, he refused the offer but later accepted it.
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.
A2 verb /ɪnˈkri:s/

increase

Meaning
to become or make something larger in amount, number, or degree
Example
The company plans to increase its production this year.
C1 adjective /ɪnˈæk.tɪv/

Inactive

Meaning
not active; not working; dormant; idle
Example
The volcano has been inactive for over a century.
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.