Idiocy
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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 noun /ˌɪn.təˈvɛn.ʃə.nɪ.zəm/

interventionism

Meaning
Government policy of active involvement in economic affairs.
Example
The central bank's interventionism helped stabilize inflation.
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.
B1 verb /ˈɪndɪkeɪt/

indicate

Meaning
to point out; to show or suggest; to be a sign of
Example
The red light indicates that you should stop.
C1 adjective /ˈɜːrksəm/

irksome

Meaning
annoying or irritating
Example
Waiting in a long line is one of the most irksome tasks.
C1 noun /ɪˌreɡjəˈlærɪti/

irregularity

Meaning
lack of regularity or consistency; a deviation from what is normal, expected, or orderly
Example
The audit revealed several financial irregularities in the company’s records.
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.
C1 noun /ˌaɪ.diˈɒl.ə.dʒi/

ideology

Meaning
A system of ideas and ideals, especially one that forms the basis of economic or political theory and policy.
Example
Democracy is based on the ideology of freedom and equality.
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.
B2 adjective /ˈɪmɪnənt/

imminent

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

infantile

Meaning
characteristic of an infant; childish
Example
His infantile behavior embarrassed everyone at the meeting.
B1 adjective /ɪˈliː.ɡəl/

illegal

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

incarceration

Meaning
the state of being imprisoned or confined
Example
The criminal faced years of incarceration for his crimes.
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 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 adjective /ˌɪɡ.nəˈmɪn.i.əs/

ignominious

Meaning
Marked by shame, disgrace, or humiliation.
Example
The team suffered an ignominious defeat in the finals.
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.
B2 noun ˌɪn.əˈveɪ.ʃən

innovation

Meaning
The action or process of innovating; a new method, idea, product, etc.
Example
Innovation drives solutions to global challenges.
C2 noun /ˌɪntərˈrɛɡnəm/

interregnum

Meaning
A period between rulers or governments when normal leadership is suspended.
Example
The country faced instability during the interregnum after the king’s death.
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.
B2 adjective /ˈaɪsi/

Icy

Meaning
extremely cold; covered with ice; unfriendly or hostile
Example
The icy wind made everyone shiver.
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.
B2 verb /ɪnˈtɜːrprət/

interpret

Meaning
to explain the meaning of something; to translate orally
Example
She had to interpret the speech for the foreign guests.
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.
C1 adverb, adjective /ˌɪnkɑːɡˈniːtoʊ/

incognito

Meaning
In disguise or with one's identity concealed.
Example
The celebrity traveled incognito to avoid the paparazzi.
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 /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 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 adjective /ɪˈlɪsɪt/

illicit

Meaning
Forbidden by law, rules, or custom.
Example
The police shut down the illicit drug operation.
C1 adjective /ˌɪnækˈsɛsəbl/

inaccessible

Meaning
unable to be reached, entered, or understood
Example
The remote village is almost inaccessible during the rainy season.
C1 adjective /ɪnˈsɪdiəs/

insidious

Meaning
Proceeding in a gradual, subtle way but with harmful effects.
Example
The insidious spread of misinformation can damage trust.
C2 adjective /ˈɪm.pi.əs/

Impious

Meaning
irreligious; lacking reverence for religion; blasphemous
Example
The impious act shocked the religious community.
C2 adjective /ˌaɪsəʊˈθɜːrməl/

isothermal

Meaning
Having or maintaining equal or constant temperature.
Example
The experiment was conducted under isothermal conditions.
C1 noun /ˈɪnstɪˌɡeɪtər/

instigator

Meaning
A person who brings about or initiates something, usually something bad.
Example
The police identified him as the instigator of the violence.
B2 adjective /ˌɪnfluˈenʃəl/

Influential

Meaning
having great influence on someone or something; powerful; persuasive
Example
She is an influential leader in the community.
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 adjective ˈɪn.tər.ɪm

interim

Meaning
In or for the intervening period; provisional or temporary.
Example
Interim governments manage transitional phases.
B2 noun ˈɪn.frəˌstrʌk.tʃər

infrastructure

Meaning
The basic physical and organizational structures and facilities needed for the operation of a society or enterprise.
Example
Digital infrastructure is vital for future advancements.
B2 adjective /ˌɪd.iˈɒt.ɪk/

Idiotic

Meaning
extremely stupid; foolish; senseless
Example
His idiotic behavior embarrassed everyone at the meeting.
C1 adjective /ɪmˈpɜːrsənl/

impersonal

Meaning
not influenced by, showing, or involving personal feelings; lacking human warmth or emotion
Example
The letter was written in a very impersonal style.
C1 verb /ɪmˈpɑːrt/

impart

Meaning
to make information known; to bestow or communicate
Example
The teacher imparted valuable knowledge to her students.
C1 adjective ɪn ˈfleɪ.ʃə.ner.i

inflationary

Meaning
Characterized by or tending to cause monetary inflation; relating to rising prices.
Example
The government took measures to control inflationary pressures.
B2 noun /ˈɪdɪət/

idiot

Meaning
a person who acts in a way that is considered very stupid or foolish
Example
He acted like an idiot at the party last night.
C1 adjective /ɪnˈɔːdəbl/

inaudible

Meaning
Unable to be heard.
Example
Her voice was almost inaudible over the noise.
C1 adjective /ɪnˈvɪnsəbl/

invincible

Meaning
too powerful to be defeated or overcome
Example
The team seemed invincible after winning ten matches in a row.
C2 noun /ˈɪn.dɪ.dʒəns/

indigence

Meaning
a state of extreme poverty or destitution
Example
The charity was founded to help people living in indigence.
B1 noun /ɪmˈpruːvmənt/

improvement

Meaning
the act of making something better
Example
There has been a significant improvement in his health.
C2 noun /ˌɪntərˈsɛsər/

intercessor

Meaning
a person who intervenes or pleads on behalf of another
Example
He acted as an intercessor to resolve the conflict between the two families.
C2 adjective /ˌɪndɪˈtɜːrmənət/

indeterminate

Meaning
Not exactly known, defined, or established; vague or uncertain.
Example
The project was delayed for an indeterminate amount of time.
C1 verb /ɪnˈsɪnjueɪt/

insinuate

Meaning
To suggest or hint something indirectly and often unpleasantly.
Example
He insinuated that she had lied about her qualifications.
B2 adjective ɪnˈev.ɪ.tə.bəl

inevitable

Meaning
Certain to happen; unavoidable.
Example
Death is an inevitable part of life.
C2 adjective /ˌɪndɪˈsɒljʊbl/

indissoluble

Meaning
Unable to be destroyed, broken, or dissolved.
Example
Marriage was once considered an indissoluble bond.
B2 adjective /ˈɪnˌsaɪtfəl/

insightful

Meaning
Showing deep understanding or perceptiveness.
Example
The professor gave an insightful lecture on global economics.
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.
C1 noun /aɪˈdiː.ə.lɪ.zəm/

Idealism

Meaning
the pursuit of high principles and noble goals; unrealistic pursuit of perfection
Example
His youthful idealism motivated him to join various social justice movements.
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 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.
B2 adjective /ˈaɪ.dəl/

Idle

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

irresolute

Meaning
uncertain or indecisive; lacking determination
Example
He stood irresolute at the crossroads, unsure which path to take.
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.
B2 noun /ɪnˈkluːʒən/

inclusion

Meaning
the action or state of including or being included within a group or structure
Example
Diversity and inclusion are key values in modern workplaces.
C2 adjective /ɪˈmɪsəbl/

immiscible

Meaning
Describes liquids that do not mix together.
Example
Oil and water are immiscible liquids.
B2 verb /ˈɪnəveɪt/

innovate

Meaning
To introduce new methods, ideas, or products.
Example
The company must innovate to stay ahead of its competitors.
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.
B1 verb ɪnˈvɛst

invest

Meaning
To put money, effort, time, etc. into something to make a profit or get an advantage.
Example
Investing in intellectual property can generate passive income.
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.
C1 verb /ˌɪn.trəˈspekt/

introspect

Meaning
To examine one's own thoughts, feelings, or mental state.
Example
He often introspects before making important decisions.
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.
B2 noun /ɪnˌtɜːrprəˈteɪʃən/

interpretation

Meaning
the action of explaining the meaning of something
Example
The teacher gave her own interpretation of the poem.
B1 verb /ɪnˈkriːst/

increased

Meaning
became greater in size, amount, or degree
Example
The company's revenue increased last year.
C1 adjective /ɪnˈseɪʃəbl̩/

insatiable

Meaning
impossible to satisfy; always wanting more
Example
Her insatiable curiosity drove her to read every book in the library.
C1 adjective ɪnˈtrɪn.zɪk

intrinsic

Meaning
Belonging naturally; essential. Existing as a natural or basic part of something.
Example
Creativity is an intrinsic quality of a great artist.
C2 adjective /ɪnˈæpt/

Inapt

Meaning
not suitable; inappropriate; unfit
Example
His comment was inapt for the formal meeting.
B1 adverb /ɪnˈkrɛdɪbli/

incredibly

Meaning
to a great degree; extremely or unbelievably
Example
The view from the top of the mountain was incredibly beautiful.
C1 adjective /ɪnˈkɒŋɡruəs/

incongruous

Meaning
Not fitting in with or suitable for the surroundings.
Example
His jokes were incongruous during the serious meeting.
C1 noun /ˈɪtʃ.i.nəs/

itchiness

Meaning
The quality or condition of feeling an irritating sensation on the skin that causes a desire to scratch.
Example
Eye itchiness often leads to rubbing.
C2 adjective /ɪnˈseɪʃiət/

insatiate

Meaning
impossible to satisfy; always wanting more
Example
He had an insatiate desire for power.
B2 verb /ɪmˈpoʊz/

impose

Meaning
to force someone to accept something; to establish or apply by authority
Example
The government imposed new taxes on luxury goods.
B2 noun /ɪnˈspekʃən/

inspection

Meaning
a careful examination of something, especially to check that it is correct or safe
Example
The building passed the safety inspection last week.
C1 noun /ɪnˌtɪmɪˈdeɪʃən/

intimidation

Meaning
The action of frightening or threatening someone to make them do something.
Example
The workers reported cases of intimidation by the management.
C2 adjective /ˌɪnfəˈlɪsɪtəs/

infelicitous

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

invocation

Meaning
the act of calling upon a higher power for help, blessing, or inspiration
Example
The ceremony began with an invocation to the gods.
C1 adjective /ˌaɪ.di.əˈlɒdʒ.ɪ.kəl/

ideological

Meaning
Relating to or based on a system of ideas or beliefs.
Example
The two parties are divided by deep ideological differences.
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.
B1 noun /ˈɪnkʌm/

income

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

imitate

Meaning
to copy the behavior or manner of someone or something
Example
Children often imitate their parents' behavior.
C1 adjective /ɪˈluː.sɪv/

Illusive

Meaning
deceptive; appearing to exist but not real; misleading
Example
The promise of easy money proved to be illusive and misleading.
C1 adjective /ˌɪn.ɪˈfɛk.tʃu.əl/

ineffectual

Meaning
Not producing any or the desired effect; lacking the ability or qualities to achieve a purpose.
Example
The manager’s ineffectual leadership caused the team to lose motivation.
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.
C1 noun /ɪnˈsæn.ə.ti/

Insanity

Meaning
the state of being seriously mentally ill; extreme foolishness or irrationality
Example
The defense lawyer argued that his client was not guilty by reason of insanity.
A1 pronoun /ɪts/

its

Meaning
Belonging to or associated with a thing previously mentioned.
Example
The company changed its logo last year.
C1 adjective /ˈɪntrɪkət/

intricate

Meaning
very detailed, complex, and difficult to understand
Example
The artist created an intricate pattern on the wall.
C1 adjective /ɪnˈfɜːm/

infirm

Meaning
Weak, especially due to old age or illness.
Example
The infirm old man needed assistance to walk.
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.
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 noun (compound/erroneous entry) /ɪnˈɛksərəbl ɑːrmi/

inexorableinexorablearmy

Meaning
This appears to be a corrupted or concatenated form; interpreted as 'inexorable army' — an unstoppable or relentless force.
Example
The rebels feared the inexorable army approaching their stronghold.
B1 noun /ɪnˈstrʌkʃən/

instruction

Meaning
Detailed information telling how something should be done or operated.
Example
Please read the instruction carefully before using the machine.
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 adjective ɪˈnɛfəbl

ineffable

Meaning
Too great or extreme to be expressed or described in words.
Example
The beauty of the landscape was ineffable.
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.
B1 noun /ˈɪnsɪdənt/

incident

Meaning
an event or occurrence, often unpleasant or unusual
Example
The police quickly responded to the incident in the park.
B2 noun /ˌɪmɪˈɡreɪʃən/

immigration

Meaning
the action of coming to live permanently in a foreign country
Example
Immigration policies vary from country to country.
B2 noun /ɪnˈsaɪdə/

insider

Meaning
a person within a group or organization who has access to confidential information
Example
He was an insider who knew all the company's secrets.
C1 verb /ˌɪn.tɚˈtwaɪn/

intertwine

Meaning
To connect or link closely; to twist together or combine closely.
Example
Their lives became intertwined through years of friendship.
B2 adjective /ɪˈrɪˌspɑn.sə.bəl/

Irresponsible

Meaning
lacking a sense of responsibility; careless
Example
It was irresponsible of him to leave without telling anyone.
C2 adjective /ɪnˈkɑːdʒɪtənt/

incogitant

Meaning
Lacking thought; inconsiderate or thoughtless.
Example
It was incogitant of him to make such a rude comment.
C1 noun /ɪmˌpɜː.sənˈeɪ.ʃən/

impersonation

Meaning
The action of pretending to be another person for the purpose of entertainment or fraud.
Example
Online impersonation is a serious cybercrime.
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.
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 noun /ɪˈrɛlɪvənsi/

irrelevancy

Meaning
the state of being unrelated or unimportant to the matter at hand
Example
The judge dismissed the argument because of its irrelevancy to the case.
C1 adjective /ɪˈrɛfjʊtəbəl/

Irrefutable

Meaning
impossible to deny or disprove; undeniable
Example
The evidence against him was irrefutable.
C2 adjective /ɪnˈdjuːbɪtəbl/

indubitable

Meaning
Impossible to doubt; unquestionable.
Example
It is indubitable that hard work leads to success.
C1 verb /ɪˈluːmɪneɪt/

illuminate

Meaning
To light up or make something clearer.
Example
Streetlights illuminate the road at night.
A2 noun /ɪmˈpɔːtəns/

importance

Meaning
The quality or state of being important; consequence or significance.
Example
The importance of time management cannot be overstated.
B2 adjective /ɪnˈseɪn/

insane

Meaning
mentally ill; extremely foolish or unreasonable
Example
The idea of jumping off the cliff seemed insane.
B1 verb /ɪnˈsɪst/

insist

Meaning
to demand firmly; to state persistently
Example
He insisted on paying the bill.
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 ˌɪn.təˈdɪs.ɪ.plɪ.nər.i

interdisciplinary

Meaning
Relating to more than one branch of knowledge.
Example
The interdisciplinary approach in education enhances problem-solving skills.
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.
C1 adjective /ˌɪnəˈtɛntɪv/

inattentive

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