irradicable
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C2 adjective /ɪˈrædɪkəbəl/

irradicable

Meaning
not able to be eradicated; impossible to destroy or remove completely
Example
The love of a mother for her child is irradicable.
C1 noun /ˌɪnkwɪˈzɪʃən/

inquisition

Meaning
A prolonged and intense questioning or investigation, often harsh in nature.
Example
The journalist faced an inquisition from the panel about his sources.
C2 adjective /ˌɪnsəˈprɛsəbl/

insuppressible

Meaning
That cannot be suppressed or restrained.
Example
She had an insuppressible urge to laugh during the ceremony.
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 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.
C1 noun ˌɪndɪˈspensəbl səˈpɔːrt

indispensable support

Meaning
Essential assistance that cannot be done without; absolutely necessary help.
Example
Volunteers provide indispensable support to communities.
C2 adjective /ˌɪnɪkˈstɛnsəbl/

inextensible

Meaning
Not capable of being stretched or extended.
Example
This rope is made of an inextensible material.
C1 noun /ˌɪndɪɡˈneɪʃən/

indignation

Meaning
Strong displeasure or anger caused by something unjust, offensive, or insulting.
Example
Public indignation grew after the unfair verdict.
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.
A2 adjective /ˈɪntrəstɪd/

interested

Meaning
Showing curiosity or concern about something.
Example
She is very interested in learning new languages.
B1 verb /ɪnˈkriːst/

increased

Meaning
became greater in size, amount, or degree
Example
The company's revenue increased last year.
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.
B2 noun /ɪnˈdʒɛkʃən/

injection

Meaning
the act of introducing a substance into the body through a needle
Example
The nurse gave me an injection to prevent the infection.
C1 verb /ɪnˈfjuːz/

infuse

Meaning
to fill or spread through something; to instill a quality, idea, or feeling
Example
The teacher tried to infuse her students with a love for reading.
C2 adjective ɪnˈdɒm.ɪ.tə.bəl

indomitable

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

Indisputable

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

indolent

Meaning
Wanting to avoid activity or exertion; lazy.
Example
The indolent cat slept in the sun all afternoon.
B2 noun /ˌaɪ.səˈleɪ.ʃən/

Isolation

Meaning
the process or fact of isolating or being isolated; separation from other people or things
Example
The patient was kept in isolation to prevent the spread of the infectious disease.
C2 noun /ˌɪmbəˈsɪləti/

imbecility

Meaning
Extreme foolishness, stupidity, or weakness of mind.
Example
The plan was abandoned due to its sheer imbecility.
A2 adjective /ˈɪn.dɔːr/

indoor

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

impinge

Meaning
to have an effect or impact on something; to encroach or infringe
Example
The noise from the construction site impinges on our daily activities.
B2 noun /ˈɪnˌteɪk/

intake

Meaning
the process of taking something in, especially food or drink
Example
He monitored his daily intake of calories to maintain a healthy diet.
B2 adjective /ɪˈlɪt.ər.ət/

Illiterate

Meaning
unable to read or write; lacking education
Example
The program aims to help illiterate adults learn to read and write.
C1 noun /ˌɪntərˌɒpərəˈbɪləti/

interoperability

Meaning
The ability of computer systems or software to exchange and make use of information.
Example
The interoperability of different software systems ensures seamless workflow.
C2 verb /ɪˈmjʊər/

immure

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

inherent

Meaning
Existing in something as a natural, permanent, or essential quality.
Example
There are inherent risks in extreme sports.
C2 noun /ˌɪməʊˈbɪləti/

immobility

Meaning
The state of being unable to move.
Example
After the accident, she suffered from immobility in her legs.
B2 adjective /ˌɪrɪˈzɪstəbəl/

Irresistible

Meaning
too attractive and tempting to be resisted; impossible to resist
Example
The chocolate cake was absolutely irresistible.
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.
C1 adjective /ɪnˈedəbəl/

Inedible

Meaning
not suitable or safe for eating; not edible
Example
The mushrooms were poisonous and completely inedible.
C1 verb /ɪnˈfjʊərieɪt/

infuriate

Meaning
To make someone extremely angry.
Example
His careless remarks infuriated the entire team.
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 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 /ɪnˈɛstɪməbl/

inestimable

Meaning
Too great or valuable to be measured or estimated.
Example
Her contribution to the project was of inestimable value.
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.
C2 adjective /ɪnˈsɛnseɪt/

insensate

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

Inapt

Meaning
not suitable; inappropriate; unfit
Example
His comment was inapt for the formal meeting.
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.
B2 noun, verb /ˈɪnstɪˌtjuːt/

institute

Meaning
as a noun, an organization founded for a specific purpose; as a verb, to establish or initiate
Example
The university decided to institute new rules for the library.
B1 verb /ɪmˈprɛs/

impress

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

impassive

Meaning
Not showing or feeling emotion; expressionless.
Example
Despite the shocking news, she remained impassive.
B2 adjective /ɪnˈstrʌkʃənəl/

instructional

Meaning
providing knowledge or information; intended to teach
Example
The website offers many instructional videos for beginners.
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 noun /ˌɪnflɛksɪˈbɪlɪti/

inflexibility

Meaning
the quality of being rigid or unwilling to change; lack of adaptability
Example
The inflexibility of the rules caused unnecessary delays.
C2 adjective /ˌɪnsəˈpɔːrtəbl̩/

insupportable

Meaning
Too extreme or difficult to be endured.
Example
The heat was insupportable during the long journey.
C1 verb /ˌɪntərˈsɛpt/

intercept

Meaning
to stop, catch, or seize something on its way from one place to another
Example
The police intercepted the stolen car before it crossed the border.
C2 noun /aɪər/

ire

Meaning
intense anger or rage
Example
The new policy provoked the ire of the employees.
C1 noun /ɪnˈsɜːrdʒəns/

insurgence

Meaning
An act of rebellion or uprising against authority.
Example
The government struggled to contain the growing insurgence.
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 /ɪˈnɪkwɪtəs/

iniquitous

Meaning
grossly unfair and morally wrong
Example
Slavery was one of the most iniquitous practices in history.
C1 adjective /ˌɪnkənˈkluːsɪv/

inconclusive

Meaning
Not leading to a definite result or decision.
Example
The investigation remained inconclusive due to a lack of evidence.
C1 noun /ˌɪnkjʊˈbeɪʃən/

incubation

Meaning
the process of keeping eggs, cells, or organisms in the right conditions for development
Example
The incubation of the eggs lasted for three weeks.
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.
C1 noun ˈɪm.pɪ.təs

impetus

Meaning
The force or motivation that drives something forward; momentum.
Example
The new policy provided an impetus for economic growth.
C2 adjective /ɪmˈpæsɪbəl/

impassible

Meaning
Incapable of suffering or feeling pain (used mainly in theological or philosophical contexts).
Example
Some philosophers argue that God is impassible and cannot experience human emotions.
B1 adjective /aɪˈdiːəl/

ideal

Meaning
the best possible; perfect for a situation
Example
This place is ideal for a picnic.
C1 noun /ɪnˈdɪf.ər.əns/

Indifference

Meaning
lack of interest, concern, or sympathy; the state of not caring about something
Example
His indifference to his studies resulted in poor grades throughout the semester.
C1 adjective /ɪnˈvɑːlənˌtɛri/

involuntary

Meaning
done without will or conscious control
Example
He gave an involuntary shiver when he heard the loud noise.
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.
C1 noun /ˌɪməˈtjʊərəti/

immaturity

Meaning
the state of not being fully developed emotionally, mentally, or physically; lack of maturity
Example
His immaturity made it difficult for him to handle responsibility.
C1 adjective /aɪˈreɪt/

irate

Meaning
Extremely angry.
Example
The customer became irate after waiting for hours.
B2 verb /ɪnˈdjuːs/

induce

Meaning
to cause or persuade someone to do something; to bring about a result
Example
The doctor induced sleep with a mild sedative.
C2 adjective /ˌɪnɪkˈsprɛsəbl/

inexpressible

Meaning
Too strong or extreme to be expressed in words.
Example
She felt inexpressible joy at the news of her success.
C1 adjective /ɪnˈæk.tɪv/

Inactive

Meaning
not active; not working; dormant; idle
Example
The volcano has been inactive for over a century.
C2 adjective /ˌɪndɪˈsɒljʊbl/

indissoluble

Meaning
Unable to be destroyed, broken, or dissolved.
Example
Marriage was once considered an indissoluble bond.
B1 verb /ɪnˈvɛnt/

invent

Meaning
to create or design something that has not existed before
Example
Thomas Edison invented the electric bulb.
C1 verb /ˈɪnstɪˌɡeɪt/

instigate

Meaning
To bring about or initiate an action, often something negative.
Example
He was accused of instigating the riot.
C2 noun /ˌɪrɪˈdɛsəns/

iridescence

Meaning
a play of lustrous, changing colors like those of a rainbow
Example
The butterfly's wings shimmered with iridescence.
C1 noun ˌɪrɪˈvɜːrsəbl ˈdæmɪdʒ

irreversible damage

Meaning
Harm or injury that cannot be undone or repaired.
Example
Climate change causes irreversible damage to ecosystems.
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.
C2 adjective /ɪnˈkoʊ.ɪt/ or /ɪnˈkoʊ.eɪt/

inchoate

Meaning
Just begun and not fully formed; rudimentary.
Example
His inchoate ideas needed more research to be developed.
A2 adverb /ˌɪnˈdɔːrz/

indoors

Meaning
inside a building; within an enclosed space
Example
Because of the rain, everyone stayed indoors.
B1 adverb /ɪˈnɪʃəli/

initially

Meaning
At the beginning; at first.
Example
Initially, he refused the offer but later accepted it.
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.
C1 noun /ˌɪnkəmˈpliːtnəs/

incompleteness

Meaning
the state of not being complete or whole; lack of necessary parts or fullness
Example
The incompleteness of the report caused delays in the project.
C1 noun /ˌɪntərˈdʒɛkʃən/

interjection

Meaning
a word or phrase used to express sudden emotion or reaction, often standing alone
Example
Words like 'wow' and 'ouch' are common interjections in English.
C1 noun /ˈɪnsɪdəns/

incidence

Meaning
the occurrence, rate, or frequency of something
Example
The incidence of road accidents has decreased this year.
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.
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.
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 adjective /ɪnˈsuːpərəbl/

insuperable

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

ingraft

Meaning
To implant or fix deeply, often used in the sense of grafting an idea or quality.
Example
The teacher tried to ingraft good manners in the students.
C1 adjective /ɪnˈtrɛpɪd/

intrepid

Meaning
fearless and adventurous, often used humorously
Example
The intrepid traveler explored the jungle alone.
C1 adjective /ɪˈmjuː.tə.bəl/

immutable

Meaning
Unchangeable, permanent, or fixed
Example
The laws of physics are considered immutable.
C1 verb /ɪnˈstɪl/

instill

Meaning
to gradually but firmly establish an idea, attitude, or habit in someone's mind
Example
Parents try to instill good values in their children.
C1 adjective /aɪˈdɪlɪk/

idyllic

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

indivertible

Meaning
Not able to be turned aside or diverted.
Example
The judge's indivertible attention was on the case.
C1 adjective /ɪnˈstɪŋk.tɪv/

instinctive

Meaning
Based on instinct; done without conscious thought; natural and automatic.
Example
His instinctive reaction saved his life.
C1 verb ɪmˈbjuː

Imbue

Meaning
Mixing some idea or feeling deeply into someone's mind
Example
The teacher tried to imbue students with a love for learning.
B2 noun /ɪnˈfek.ʃən/

Infection

Meaning
the process of infecting or the state of being infected; a disease caused by germs
Example
The doctor prescribed antibiotics to treat the bacterial infection in her throat.
C2 verb /ɪˈnjʊər/

inure

Meaning
To become accustomed to something, especially something unpleasant.
Example
Soldiers quickly became inured to the harsh conditions.
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 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.
B2 noun /ˌɪntərˈsɛkʃən/

intersection

Meaning
a point where two or more things intersect, especially a road or path
Example
The intersection of Main Street and 5th Avenue is always busy.
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 adjective /ɪˈnjʊərd/

inured

Meaning
Accustomed to something, especially something unpleasant.
Example
After years of hardship, she was inured to suffering.
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.
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.
B2 noun /ˈɪnfənt/

infant

Meaning
A very young child or baby.
Example
The infant was sleeping peacefully in the cradle.
B2 adjective /ɪmˈpɜːrfɪkt/

imperfect

Meaning
Not perfect; having faults or flaws.
Example
The painting was beautiful despite being imperfect.
C1 adjective /ˌɪnstənˈteɪniəs/

instantaneous

Meaning
Happening immediately, without any delay.
Example
The change in temperature was almost instantaneous.
C2 adjective/verb /ɪnˈkɑːrneɪt/

incarnate

Meaning
to embody or represent in human form; in flesh
Example
She is kindness incarnate.
C1 noun /ɪnˈtruː.ʒən/

intrusion

Meaning
Unauthorized entry into a system or place without permission
Example
The company detected an intrusion in its server.
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.
C2 adjective /ˌɪnɪˈsɛnʃəl/

inessential

Meaning
not necessary or important; not essential
Example
The report removes all inessential details to stay focused.
C1 noun /ˈɪn.tə.lekt/

intellect

Meaning
The ability to think, reason, and understand objectively.
Example
Her intellect is admired by all her colleagues.
C1 adjective /ˈɪndɪɡoʊ bluː/

Indigo-blue

Meaning
a deep blue color with a purplish tinge
Example
The indigo-blue sky looked magnificent at twilight.
B2 noun /ɪnˈventər/

inventor

Meaning
a person who creates or designs something new, especially a device, method, or process
Example
The inventor patented her new medical device.
B1 noun ˌɪndɪˈpendəns

independence

Meaning
The fact or state of being independent; freedom from outside control; not being subject to another's authority.
Example
Independence inspired the movement.
C2 noun /ˈɪl.i.æd/

iliad

Meaning
An ancient Greek epic poem attributed to Homer, describing the events of the Trojan War.
Example
Students studied the Iliad to understand Greek mythology and heroism.
B2 adjective /ɪmˈprɒp.ər/

Improper

Meaning
inappropriate; incorrect; not suitable
Example
It would be improper to discuss personal matters in a business meeting.
B2 noun /ˌɪnəˈbɪləti/

inability

Meaning
the state of being unable to do something
Example
His inability to make decisions affected his career.
C2 verb /ˌɪmpɔːrˈtuːn/

importune

Meaning
To ask someone persistently or pressingly for something
Example
The child importuned his mother for a new toy.
B2 verb /ˌɪntərˈfɪər/

interfere

Meaning
to become involved in something that is not your concern; to hinder or obstruct
Example
Parents should not interfere in their children’s personal choices.
B2 adjective /ˈɪmɪnənt/

imminent

Meaning
About to happen; likely to occur very soon.
Example
Dark clouds signaled that a storm was imminent.
C2 adjective /ˌɪndɪˈsɜːrnəbl/

indiscernible

Meaning
Impossible or difficult to see, notice, or distinguish.
Example
The difference between the two shades was almost indiscernible.
C2 adjective /ˌɪɡ.nəˈmɪn.i.əs/

ignominious

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