invective
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C2 noun /ɪnˈvɛktɪv/

invective

Meaning
Insulting, abusive, or highly critical language.
Example
The politician’s speech was filled with invective against his opponents.
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.
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.
C1 adjective /ˌɪnədˈvaɪzəbl/

inadvisable

Meaning
Not recommended; likely to have undesirable consequences.
Example
It is inadvisable to drive in such heavy rain.
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.
C1 noun /ɪmˈpɛdɪmənt/

impediments

Meaning
A hindrance or obstruction in doing something; things that prevent progress or achievement.
Example
Economic impediments often hinder social development.
C2 adjective /ɪnˈsɛptɪv/

inceptive

Meaning
Relating to or marking the beginning or initial stage of something.
Example
The inceptive phase of the project was marked by enthusiastic planning.
C1 noun /ˌɪnfɪˈdɛləti/

infidelity

Meaning
the act of being unfaithful to a spouse or partner
Example
Their marriage ended due to his infidelity.
C1 adjective /ɪˈræʃənəl/

irrational

Meaning
not logical or reasonable; lacking clear thought
Example
His fear of the dark was completely irrational.
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 adjective /ɪmˈpæsəbəl/

impassable

Meaning
Impossible to travel along or over.
Example
The road became impassable after the heavy snowfall.
A2 adverb /ˌɪnˈdɔːrz/

indoors

Meaning
inside a building; within an enclosed space
Example
Because of the rain, everyone stayed indoors.
C2 adjective /ˌɪrɪˈlɪdʒəs/

irreligious

Meaning
Indifferent or hostile to religion
Example
Some people in the community consider him irreligious because he never attends religious services.
C2 adjective /ˌɪrɪˈtriːvəbl/

irretrievable

Meaning
impossible to recover or regain
Example
The documents were lost in an irretrievable way after the fire.
C2 adjective /ˌɪnkɒntrəˈvɜːtəbl/

incontrovertible

Meaning
impossible to deny or dispute; unquestionable
Example
The evidence was incontrovertible and proved his innocence.
C1 adjective /ˈɪnfəməs/

infamous

Meaning
well known for some bad quality or deed
Example
The dictator was infamous for his cruelty.
C2 adjective /ɪmˈpɔːrtʃənət/

importunate

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

isochronous

Meaning
Occurring at equal time intervals; in unison or synchrony.
Example
The pendulum swings are isochronous, repeating at equal intervals.
C1 verb /ɪmˈpɑːrt/

impart

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

improved

Meaning
made better or enhanced in quality or condition
Example
Her health has significantly improved since last month.
B2 noun ɪˈmjuː.nɪ.ti

immunity

Meaning
The ability of an organism to resist a particular infection or toxin by the action of specific antibodies.
Example
A strong immunity protects against infections.
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 adverb /ˌɪndəˈrɛktli/

indirectly

Meaning
in a way that is not direct; through an intermediate means or influence
Example
The policy affected small businesses indirectly.
C2 adjective /ɪˈnɪmɪkəl/

inimical

Meaning
tending to obstruct or harm; unfriendly or hostile
Example
The policy was inimical to the country's economic growth.
C1 adverb /ˈɪnwərdli/

inwardly

Meaning
In the mind or spirit; not outwardly visible.
Example
She smiled outwardly but inwardly she was worried.
B1 verb /ˈɪndʒər/

injure

Meaning
to cause physical harm or damage to someone or something
Example
He injured his leg while playing football.
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 /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.
C1 adjective /ɪnˈtɛlɪdʒəbl/

intelligible

Meaning
Able to be understood; clear enough to be comprehended.
Example
Her speech was barely intelligible over the noise.
B2 adjective + noun aɪˈdiːəl ɪnˈvaɪrənmənt

ideal environment

Meaning
Perfect or most suitable conditions for growth or development
Example
Winter creates an ideal environment for vegetable growth.
C1 adjective /ɪnˈæk.tɪv/

Inactive

Meaning
not active; not working; dormant; idle
Example
The volcano has been inactive for over a century.
C1 adjective /ɪnˈhjuːmən/

Inhuman

Meaning
lacking human qualities; cruel; brutal; savage
Example
The dictator's inhuman treatment of prisoners shocked the international community.
C2 verb /ɜːrk/

irk

Meaning
to annoy or irritate someone
Example
It irks me when people are late without calling.
C1 adjective /ɪmˈplɔːzəbl/

implausible

Meaning
Not seeming reasonable or probable; unlikely to be true.
Example
The story she told was so implausible that no one believed her.
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.
C1 noun /ˈɪnflʌks/

influx

Meaning
A large arrival or flow of people or things.
Example
The city experienced an influx of tourists during the festival.
C1 verb /ɪmˈpɜːrsəneɪt/

impersonate

Meaning
to pretend to be another person in order to entertain or deceive
Example
He was arrested for trying to impersonate a police officer.
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.
B1 noun ɪnˈven.ʃən

invention

Meaning
The action of inventing something, typically a process or device.
Example
The invention revolutionized communication.
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.
A1 pronoun /ɪt/

it

Meaning
used to refer to a thing, animal, or idea previously mentioned or easily identified
Example
It is raining outside.
C1 verb /ɪˈluːmɪneɪt/

illuminate

Meaning
To light up or make something clearer.
Example
Streetlights illuminate the road at night.
B2 verb /ɪnˈveɪd/

invade

Meaning
to enter a place or country forcefully, especially as an enemy
Example
The army invaded the neighboring country.
C1 adjective /ˌɪnækˈsɛsəbl/

inaccessible

Meaning
unable to be reached, entered, or understood
Example
The remote village is almost inaccessible during the rainy season.
C2 adjective /ˌɪnˈekspɜːrt/

inexpert

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

interposition

Meaning
The act of intervening or coming between two things, often to influence or prevent an outcome.
Example
The manager’s interposition prevented a heated argument from escalating.
B2 verb /ɪnˈʃʊər/

insure

Meaning
to provide insurance; to make certain
Example
I need to insure my new car.
C2 verb /ˌɪntərˈmɪt/

intermit

Meaning
To suspend or stop for a time; to pause intermittently.
Example
The rain would intermit and then start again.
C2 noun /ˈaɪ.lət/

islet

Meaning
A very small island.
Example
The fishermen rested on a tiny islet before continuing their journey.
B2 noun ɪˈlɪtərəsi

illiteracy

Meaning
The inability to read and write; lack of education or knowledge in a particular area.
Example
Illiteracy often leads to poverty and unemployment.
B2 adjective /ˌɪnkəmˈpliːt/

incomplete

Meaning
Not finished, lacking some parts or not whole.
Example
Her report was incomplete and needed further details.
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.
C2 adjective /ɪnˈseɪʃiət/

insatiate

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

insensate

Meaning
lacking physical sensation or empathy; without feeling or sensitivity
Example
The dictator's insensate cruelty shocked the world.
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.
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.
A1 pronoun /ɪts/

its

Meaning
Belonging to or associated with a thing previously mentioned.
Example
The company changed its logo last year.
B2 noun /ˈaɪ.dəl/

Idol

Meaning
an image or representation of a god used as an object of worship; a person who is greatly admired
Example
The singer became a teenage idol after her hit song topped the charts worldwide.
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.
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.
A1 preposition /ˈɪntuː/

into

Meaning
expressing movement or direction to the inside of something
Example
She walked into the room quietly.
C1 adjective /ɪnˈvɑːlənˌtɛri/

involuntary

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

insolent

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

innocuous

Meaning
Not harmful or offensive.
Example
His remark was completely innocuous and not meant to offend anyone.
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 verb /ɪmˈpɛl/

impel

Meaning
to drive, force, or urge someone to do something
Example
Her curiosity impelled her to open the mysterious box.
C2 verb /ɪˈluːmɪn/

illumine

Meaning
to light up or make clear
Example
The rising sun illumined the mountain peaks.
B2 adjective /ɪnˈsɛnsətɪv/

insensitive

Meaning
Showing or feeling no concern for others' feelings.
Example
His insensitive comment hurt her deeply.
C2 adjective /ˌɪnsəˈpɔːrtəbl̩/

insupportable

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

inchoative

Meaning
relating to the beginning of something; in an initial stage
Example
The poet used inchoative expressions to depict the dawn of creation.
B2 adjective /ˌɪnkənˈsɪstənt/

inconsistent

Meaning
Not staying the same throughout; lacking harmony or regularity.
Example
His answers were inconsistent and confusing.
C2 noun /ɪnˈtɛɡ.jʊ.mənt/

integument

Meaning
A natural outer covering, such as skin, shell, or rind.
Example
The snake sheds its integument as it grows.
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.
C2 adjective /ɪnˈeɪliənəbl/

inalienable

Meaning
Unable to be taken away or transferred; absolute and permanent.
Example
Freedom of speech is an inalienable right.
C1 adjective /ˌɪlɪˈdʒɪtɪmət/

illegitimate

Meaning
Not authorized by law, rules, or standards; not recognized as valid.
Example
The court ruled the contract to be illegitimate.
B1 adjective /ˌɪnɪkˈspɛnsɪv/

Inexpensive

Meaning
not costing a lot of money; affordable; budget-friendly
Example
This restaurant offers delicious and inexpensive meals for students.
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.
C1 noun ˌɪm.pʌlˈsɪv.ɪ.ti

impulsivity

Meaning
The tendency to act quickly and without thought or care; lack of self-control.
Example
His impulsivity led him to make reckless choices.
C2 verb /ɪmˈpjuːt/

impute

Meaning
to attribute a fault or responsibility to someone
Example
They imputed the company's success to good leadership.
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 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 /ˌɪndɪˈvɪzəbl/

indivisible

Meaning
Not able to be divided or separated.
Example
The country's unity was indivisible despite differences.
C1 adjective /ˌɪndɪˈskriːt/

indiscreet

Meaning
Not careful in what one says or does, likely to reveal secrets or offend.
Example
It was indiscreet of him to mention the plan in public.
C1 adjective ˌɪn.krəˈmen.təl

incremental

Meaning
Relating to or denoting an increase or addition, especially one of a series on a fixed scale; proceeding in small stages.
Example
Incremental changes ensure sustainability.
B2 adjective, noun /ɪzˈreɪli/

israeli

Meaning
relating to Israel or its people; a person from Israel
Example
She works for an Israeli company.
C1 adjective /ɪnˈtɜːrmənəbl/

interminable

Meaning
Seemingly endless; having no apparent end.
Example
The meeting felt interminable and exhausting.
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.
C2 adjective /ˌɪnkɔːrˈpɔːriəl/

incorporeal

Meaning
lacking a physical body; not composed of matter; intangible
Example
Ghosts are often described as incorporeal beings.
C1 verb /ɪnˈkrɪmɪˌneɪt/

incriminate

Meaning
to make someone appear guilty of a crime or wrongdoing
Example
The new evidence could incriminate the suspect in the robbery case.
B2 adjective ˌɪn.təˈræk.tɪv

interactive

Meaning
Allowing a two-way flow of information between it and a user, responding to the user's input.
Example
Interactive learning keeps students engaged in lessons.
B1 verb /ɪnˈvɛs.tɪ.ɡeɪt/

investigate

Meaning
to carry out a systematic inquiry to discover facts or information
Example
The police will investigate the incident thoroughly.
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.
C2 verb /ˈɪŋkʌlpeɪt/

inculpate

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

isothermal

Meaning
Having or maintaining equal or constant temperature.
Example
The experiment was conducted under isothermal conditions.
A2 noun/verb /ˈaɪən/ or /ˈaɪərn/

iron

Meaning
a strong, hard metal used in construction; also to press clothes with heat
Example
He used an iron to smooth his shirt.
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 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.
C2 adjective /ˌɪrɪˈfrændʒɪbəl/

irrefrangible

Meaning
Not to be broken, violated, or infringed
Example
The constitution guarantees certain irrefrangible rights to every citizen.
B1 adjective /ɪnˈtɜːrnəl/

internal

Meaning
situated inside; relating to the inside or inner part of something
Example
The company is conducting an internal audit this month.
B2 adjective /ɪˈrɪˌspɑn.sə.bəl/

Irresponsible

Meaning
lacking a sense of responsibility; careless
Example
It was irresponsible of him to leave without telling anyone.
B2 noun ˈɪndɪkeɪtə

indicator

Meaning
A thing that indicates the state or level of something.
Example
The unemployment rate is a key indicator of economic health.
C2 adjective /ˈɪnfəntaɪl/

infantile

Meaning
characteristic of an infant; childish
Example
His infantile behavior embarrassed everyone at the meeting.
C2 adjective /ɪˈmɒdɪst/

immodest

Meaning
lacking humility or decency; excessively proud or improper
Example
His immodest remarks offended the audience.
C1 adjective /ˌɪndɪˈfɛnsəbl̩/

indefensible

Meaning
not able to be protected or justified
Example
The minister’s remarks were considered indefensible by the public.
C2 adjective /ɪmˈprɛɡnəbl̩/

impregnable

Meaning
Unable to be captured, broken into, or defeated.
Example
The fortress was considered impregnable by the enemy.
B2 adjective /ˌɪnfluˈenʃəl/

Influential

Meaning
having great influence on someone or something; powerful; persuasive
Example
She is an influential leader in the community.
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.
B1 verb /ɪmˈpɔːrt/

import

Meaning
to bring goods or services into a country from abroad; to transfer data
Example
The country imports oil from abroad.
C1 verb /ɪnˈfleɪt/

inflate

Meaning
to fill with air or gas so it expands; to increase excessively or artificially
Example
The mechanic inflated the tire to the correct pressure.
C2 noun /ɪmˈpjuːnɪti/

impunity

Meaning
freedom from punishment or harmful consequences for an action
Example
The dictator ruled with impunity, ignoring international laws.
C2 adjective /ɪˈnɪkwɪtəs/

iniquitous

Meaning
grossly unfair and morally wrong
Example
Slavery was one of the most iniquitous practices in history.
B2 adjective ɪˈmɜː.sɪv

immersive

Meaning
Providing, involving, or characterized by deep absorption or immersion in something.
Example
Virtual reality creates an immersive learning environment.
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.
B2 adjective /ɪnˈfɔːrmətɪv/

Informative

Meaning
giving or providing useful information; educational; instructive
Example
The documentary was very informative and educational.
B2 adjective /ˈaɪsi/

Icy

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

inanimate

Meaning
not alive, especially not in the manner of animals and humans; lifeless
Example
The museum was full of inanimate objects from ancient times.
C1 verb /ɪmˈploʊd/

implode

Meaning
To collapse or burst inward violently.
Example
The old building imploded during the demolition.
C2 verb /ɪˈnjʊər/

inure

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

intestate

Meaning
Having died without leaving a valid will.
Example
She died intestate, so her assets were distributed by law.
B2 adjective ˌɪnstrəˈmɛntl

instrumental

Meaning
Serving as a crucial means, agent, or tool; having a part in bringing about a result.
Example
Children can be instrumental in building a better society.
C1 adjective /ɪmˈpɜːmiəbl/

impermeable

Meaning
Not allowing fluid or gas to pass through.
Example
The container is made of impermeable plastic.