incongruity
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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 /ˌɪkθiˈɒlədʒɪst/

ichthyologist

Meaning
A scientist who studies fish.
Example
The ichthyologist discovered a new species of fish in the river.
A1 noun /aɪs/

Ice

Meaning
water that has frozen and become solid
Example
The ice in my drink melted quickly in the hot weather.
C2 verb /ˈɪndjʊˌreɪt/

indurate

Meaning
To harden or make something physically or emotionally tough.
Example
Years of hardship indurated his spirit.
C1 verb /ɪˈluːmɪneɪt/

illuminate

Meaning
To light up or make something clearer.
Example
Streetlights illuminate the road at night.
C1 verb /ɪnˈvɪɡ.ər.eɪt/

invigorate

Meaning
To give strength or energy to someone or something.
Example
A morning walk can invigorate both body and mind.
C1 adjective /ˌɪrɪˈvɜːrsəbl/

irreversible

Meaning
Not able to be undone, changed, or reversed.
Example
The damage caused by the fire was irreversible.
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.
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 noun /ɪmˈprɪzənmənt/

imprisonment

Meaning
the act of putting someone in prison; the state of being confined as punishment
Example
He faced imprisonment for violating the court order.
C1 noun /ɪˈreləvəns/

irrelevance

Meaning
the quality of not being connected to or important for a particular matter; lack of significance
Example
His long explanation only highlighted the irrelevance of the details to the main issue.
A2 verb /ɪnˈvaɪt/

invite

Meaning
to ask someone to come to an event or to do something
Example
We should invite all our friends to the party.
C1 adjective /ˌɪndɪˈvɪzəbl/

indivisible

Meaning
Not able to be divided or separated.
Example
The country's unity was indivisible despite differences.
B2 adjective /ˌɪnɪˈfɪʃənt/

Inefficient

Meaning
not achieving maximum productivity; wasteful of time or resources
Example
The old computer system was inefficient and wasted a lot of time.
C1 adjective /ˌɪnkəmˈpætəbl/

incompatible

Meaning
Not able to exist or work together without conflict.
Example
Their personalities were completely incompatible.
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.
B2 noun /ˈɪɡ.nər.əns/

Ignorance

Meaning
lack of knowledge or information; the state of being uninformed about something
Example
His ignorance about basic computer skills made it difficult for him to find a job.
C1 adjective /aɪˈreɪt/

irate

Meaning
Extremely angry.
Example
The customer became irate after waiting for hours.
C1 adjective /ɪˈmoʊbəl/

immobile

Meaning
unable to move or be moved
Example
After the accident, he was immobile for weeks.
C2 adjective /ɪnˈvaɪələt/

inviolate

Meaning
free from violation, injury, or desecration; kept safe and untouched
Example
The ancient temple remained inviolate for centuries.
C1 adjective /ˌaɪdiəˈlɪstɪk/

Idealistic

Meaning
pursuing high principles or ideals; unrealistically optimistic
Example
She has an idealistic view of changing the world.
C1 noun ˌɪnfrəˈstrʌktʃərəl dɪˈveləpmənt

infrastructural development

Meaning
The process of building and improving the basic physical and organizational structures and facilities needed for the operation of a society or enterprise.
Example
Infrastructural development is necessary for efficient recycling.
C2 noun /ɪnˈtɛmpərəns/

intemperance

Meaning
Lack of moderation or self-control, especially with drinking or eating.
Example
His intemperance in drinking ruined his health.
C2 noun /ˌaɪ.diˈeɪ.ʃən/

ideation

Meaning
The process of forming and developing new ideas or concepts through creative thinking and brainstorming.
Example
The team engaged in ideation sessions to generate new product ideas.
C2 adjective /ɪnˈdʒɛnjuəs/

ingenuous

Meaning
Innocent, naive, and unsuspecting; showing childlike simplicity and sincerity.
Example
Her ingenuous smile revealed her genuine kindness.
C1 adjective; noun /ɪˈmɔːrtl/

immortal

Meaning
living forever; never dying; lasting forever in fame or memory
Example
Legends often describe heroes as immortal beings who never die.
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 /ˌɪnæprɪˈhɛnsəbl/

inapprehensible

Meaning
not understandable; incomprehensible
Example
The concept was so abstract that it seemed inapprehensible to most students.
C1 adjective /ɪˈlʌstriəs/

illustrious

Meaning
Well known, respected, and admired for past achievements.
Example
She had an illustrious career in medicine.
C2 adjective /ˌɪnkɒntrəˈvɜːtəbl/

incontrovertible

Meaning
impossible to deny or dispute; unquestionable
Example
The evidence was incontrovertible and proved his innocence.
B2 verb /ˈɪl.ə.streɪt/

illustrate

Meaning
to explain or make something clear by using examples, pictures, or comparisons
Example
The teacher used diagrams to illustrate the concept.
C1 adjective /ɪnˈdʒʊəriəs/

injurious

Meaning
Causing or likely to cause harm or damage.
Example
Smoking is injurious to health.
B1 noun /ˈɪn.flu.əns/

Influence

Meaning
the capacity to have an effect on the character, development, or behavior of someone or something
Example
The teacher's positive influence helped the student overcome his learning difficulties.
B2 verb /ˈɪr.ɪ.teɪt/

irritate

Meaning
To make someone annoyed or angry; to cause discomfort or inflammation.
Example
Rubbing your eyes can irritate them.
B2 verb /ɪnˈʃʊər/

insure

Meaning
to provide insurance; to make certain
Example
I need to insure my new car.
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.
C1 verb /ˈɪnfɪltreɪt/

infiltrate

Meaning
to secretly enter or gain access to a place or group
Example
The spies managed to infiltrate the enemy base.
C1 noun /ˈɪnkwest/

inquest

Meaning
A legal or official inquiry, especially into the cause of a death.
Example
The inquest revealed the cause of the accident.
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 adverb /ˌɪnsɪˈdɛntəli/

incidentally

Meaning
by the way; used to introduce a remark not directly related to the main subject
Example
Incidentally, did you know that she studied in Paris?
C1 verb /ɪmˈpiːd/

impede

Meaning
To obstruct or hinder the progress or development of something.
Example
Lack of funds can impede business growth.
C1 noun ˌɪn.tuˈɪʃ.ən

intuition

Meaning
The ability to understand something immediately, without the need for conscious reasoning.
Example
Her intuition told her something was wrong.
C1 adjective ɪˈluː.sər.i

illusory

Meaning
Based on illusion; not real although seeming to be.
Example
His sense of security was entirely illusory.
C2 adjective /ɪnˈseɪʃiət/

insatiate

Meaning
impossible to satisfy; always wanting more
Example
He had an insatiate desire for power.
C2 noun /ɪˈluːmɪnənt/

illuminant

Meaning
A substance or device that produces light.
Example
The lamp acted as an illuminant in the dark cave.
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 ˌɪn.tɪˈɡreɪ.ʃən

integration

Meaning
The action or process of integrating; the process of combining or adding parts to make a unified whole.
Example
Integration of networks will improve global communication.
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.
C2 adjective /ˌɪnkənˈsɪdərəbl/

inconsiderable

Meaning
Too small or unimportant to be worth considering.
Example
The donation was not inconsiderable, though smaller than expected.
B2 noun ˌɪmplɪmenˈteɪʃən

implementation

Meaning
The process of putting a decision or plan into effect; execution.
Example
Proper implementation of policies is crucial.
A1 preposition /ˈɪntuː/

into

Meaning
expressing movement or direction to the inside of something
Example
She walked into the room quietly.
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 noun /aɪər/

ire

Meaning
intense anger or rage
Example
The new policy provoked the ire of the employees.
A1 pronoun /ɪt/

it

Meaning
used to refer to a thing, animal, or idea previously mentioned or easily identified
Example
It is raining outside.
C2 adjective /ɪˈnjʊərd/

inured

Meaning
Accustomed to something, especially something unpleasant.
Example
After years of hardship, she was inured to suffering.
B2 adjective /ɪnˈvɪz.ə.bəl/

Invisible

Meaning
unable to be seen; not visible to the eye
Example
The bacteria are invisible without a microscope.
B1 adjective /ˌɪmpəˈlaɪt/

impolite

Meaning
Not showing good manners; rude.
Example
It is impolite to interrupt someone while they are speaking.
C2 adjective /ɪnˈsuːpərəbl/

insuperable

Meaning
Impossible to overcome or surpass.
Example
The team faced insuperable challenges during the expedition.
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 noun /ˈɪm.ɪdʒ/

Image

Meaning
a representation of the external form of a person or thing in art; a mental picture or impression
Example
The company worked hard to improve its public image after the scandal.
C2 adjective /ˌɪrɪˈtriːvəbl/

irretrievable

Meaning
impossible to recover or regain
Example
The documents were lost in an irretrievable way after the fire.
B1 adjective /ˈɪrɪteɪtɪŋ/

irritating

Meaning
causing annoyance, impatience, or mild anger
Example
The constant noise from the street is extremely irritating.
B2 adjective /ˈaɪ.dəl/

Idle

Meaning
lazy; inactive; not working or being used
Example
The factory workers were idle during the strike.
C1 adjective /ˌɪndɪˈskrɪmɪnət/

indiscriminate

Meaning
Done without careful judgment; random or haphazard.
Example
The indiscriminate use of pesticides harms the environment.
C2 adjective /ˈɪn.dɪ.dʒənt/

indigent

Meaning
lacking the necessities of life due to poverty; very poor
Example
The hospital offers free care to indigent patients.
B1 noun /ˈɪnkʌm/

income

Meaning
money received for work or through investments
Example
His monthly income is enough to support his family.
B2 adjective /ɪnˈsɛnsətɪv/

insensitive

Meaning
Showing or feeling no concern for others' feelings.
Example
His insensitive comment hurt her deeply.
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.
B1 noun /ɪmˈpruːvmənt/

improvement

Meaning
the act of making something better
Example
There has been a significant improvement in his health.
C1 noun /ɪˈnɜː.ʃə/

Inertia

Meaning
a tendency to do nothing or remain unchanged; lack of activity or movement
Example
The team's inertia prevented them from adapting to the rapidly changing market conditions.
A2 noun /ɪmˈpɔːtəns/

importance

Meaning
The quality or state of being important; consequence or significance.
Example
The importance of time management cannot be overstated.
C1 noun /ɪnˈtɛstɪn/

intestine

Meaning
The part of the digestive system where food is digested and absorbed, extending from the stomach to the anus.
Example
The doctor explained how nutrients are absorbed in the small intestine.
C1 adjective /ɪnˈsɪstənt/

insistent

Meaning
demanding something firmly and refusing to accept no
Example
The child was insistent on getting a new toy.
A1 noun /ˌɪnfərˈmeɪʃən/

information

Meaning
Facts or knowledge provided or learned about something.
Example
The website provides useful information about travel destinations.
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.
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 /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.
C2 adjective /ˌɪmpəˈmɪsəbl/

impermissible

Meaning
Not permitted or allowed.
Example
Such behavior is impermissible in the workplace.
B2 adjective /ɪnˈtɒlərənt/

intolerant

Meaning
unwilling to accept or respect beliefs or behavior different from one's own
Example
He is intolerant of any opinion that differs from his own.
C2 adjective /ɪnˈtɛsteɪt/

intestate

Meaning
Having died without leaving a valid will.
Example
She died intestate, so her assets were distributed by law.
C1 verb /ɪmˈpɛl/

impel

Meaning
to drive, force, or urge someone to do something
Example
Her curiosity impelled her to open the mysterious box.
C1 noun /ɪmˌpɒsəˈbɪlɪti/

impossibility

Meaning
the state or fact of being impossible; something that cannot be done or achieved
Example
Finishing the project in one day was an impossibility.
C1 adjective /ɪˈlɒdʒ.ɪ.kəl/

Illogical

Meaning
not reasonable or sensible; lacking logic
Example
It would be illogical to go swimming in such cold weather.
C1 noun /ɪmˈbæl.əns/

Imbalance

Meaning
lack of proportion or relation between corresponding things; unequal distribution
Example
The doctor said the patient's dizziness was caused by an inner ear imbalance.
C2 noun /ˈɪnsələns/

insolence

Meaning
rude or disrespectful behavior
Example
The teacher was shocked by the student's insolence.
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 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 /ˌɪm.ɪˈteɪ.ʃən/

Imitation

Meaning
the action of using someone or something as a model; a copy of something original
Example
His imitation of the famous actor was so good that everyone burst into laughter.
C1 verb /ˈɪnstɪˌɡeɪt/

instigate

Meaning
To bring about or initiate an action, often something negative.
Example
He was accused of instigating the riot.
B2 adjective /ɪnˈfekʃəs/

infectious

Meaning
capable of causing infection or disease; spreading easily from one person to another; able to spread feelings or attitudes such as enthusiasm
Example
Her infectious laughter made everyone in the room smile.
C1 verb /ɪmˈpɛər/

impair

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

importune

Meaning
To ask someone persistently or pressingly for something
Example
The child importuned his mother for a new toy.
B1 adjective /ɪˈliː.ɡəl/

illegal

Meaning
Not allowed by law; unlawful.
Example
It is illegal to drive without a valid license.
C2 adjective /ɪmˈplaɪəbl/

impliable

Meaning
Capable of being implied or suggested.
Example
The meaning of the statement is not directly clear but is impliable from the context.
C2 noun /aɪˈoʊtə/

iota

Meaning
An extremely small amount.
Example
He did not show an iota of fear.
B2 noun /ɪnˈtɜː.prə.tər/

Interpreter

Meaning
a person who translates orally from one language into another; someone who explains meaning
Example
The international conference hired professional interpreters to translate speeches in real time.
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.
C1 noun ˌɪn.ɪˈfɪʃ.ən.si

inefficiency

Meaning
The state or quality of not achieving maximum productivity; failure to make the best use of time or resources.
Example
Government inefficiency leads to slow project completion.
C1 noun ˈɪn.fər.əns

inference

Meaning
A conclusion reached on the basis of evidence and reasoning; logical deduction.
Example
Scientists make inferences based on experimental data.
C1 verb /ɪmˈbɛd/

imbed

Meaning
To fix firmly or deeply in a surrounding mass.
Example
The journalist imbedded himself with the troops to report firsthand.
B2 verb ɪnˈvɛst.ɪŋ

investing

Meaning
The act of putting money into financial schemes, shares, property, or a commercial venture with the expectation of achieving a profit.
Example
Investing in stocks can generate long-term wealth.
C2 noun /ˌɪmprɪˈkeɪʃən/

imprecation

Meaning
A spoken curse or expression of strong condemnation.
Example
The angry crowd hurled imprecations at the corrupt official.
C1 adjective /ˌɪn.dɪˈspen.sə.bəl/

indispensable

Meaning
Absolutely necessary, essential
Example
Water is indispensable for human survival.
B2 adjective /ˈaɪsi/

Icy

Meaning
extremely cold; covered with ice; unfriendly or hostile
Example
The icy wind made everyone shiver.
C1 noun /ˈɪnkjʊˌbeɪtər/

incubator

Meaning
a device or environment that provides suitable conditions for eggs, cells, or infants to develop
Example
The premature baby was placed in an incubator for care.
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.
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.
B2 adjective /ɪnˈækjərət/

Inaccurate

Meaning
not correct; containing errors; wrong
Example
The weather forecast was inaccurate yesterday.
B2 verb ɪmˈpoʊz

imposes

Meaning
To establish or apply by authority; to force something unwelcome or unfamiliar to be accepted or put in place.
Example
Pollution imposes harmful effects on the environment.
C2 noun /ˈaɪsinəs/

iciness

Meaning
The state of being cold in manner or temperature.
Example
There was a distinct iciness in his voice.
C2 adjective ɪnˈdɒm.ɪ.tə.bəl

indomitable

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

insurrection

Meaning
A violent uprising against an authority or government.
Example
The army was called in to suppress the insurrection.
C1 adjective /ˌɪnəˈfɛnsɪv/

inoffensive

Meaning
Not likely to offend or provoke; harmless.
Example
His inoffensive remarks kept the conversation friendly.
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.
B1 verb /ɪnˈvɛnt/

invent

Meaning
to create or design something that has not existed before
Example
Thomas Edison invented the electric bulb.
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.
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.
C1 noun /ɪnˈfɜː.mə.ti/

Infirmity

Meaning
physical or mental weakness; a disease or ailment; frailty
Example
Despite his advanced age and various infirmities, he remained mentally sharp and alert.
C2 adjective /ˌɪntərˈniːsaɪn/

internecine

Meaning
Relating to conflict within a group, often causing mutual destruction.
Example
The internecine conflict weakened the organization from within.
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.
B1 verb ɪnˈspaɪər

inspire

Meaning
To fill someone with the urge or ability to do or feel something, especially creative or noble.
Example
Artemis seeks to inspire future generations.