impersuadable
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C2 adjective /ɪmˌpɜːrˈsweɪdəbl/

impersuadable

Meaning
not able to be convinced or persuaded
Example
She remained impersuadable despite all our arguments.
B1 noun /ˈɪnsɪdənt/

incident

Meaning
an event or occurrence, often unpleasant or unusual
Example
The police quickly responded to the incident in the park.
C2 adjective ɪnˈdɒm.ɪ.tə.bəl

indomitable

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

innocuous

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

imponderable

Meaning
Something difficult or impossible to estimate, assess, or understand
Example
The outcome of the election depends on many imponderable factors.
B2 adjective /ɪmˈpɜːrfɪkt/

imperfect

Meaning
Not perfect; having faults or flaws.
Example
The painting was beautiful despite being imperfect.
C2 noun /ˌɪn.ʌnˈdeɪ.ʃən/

inundation

Meaning
The act of flooding or overwhelming with water or things.
Example
The town suffered from a severe inundation after the heavy rains.
C1 noun /ˌɪnsəˈfɪʃənsi/

insufficiency

Meaning
The state of not being enough or not being adequate.
Example
The project failed due to the insufficiency of funds.
C1 noun/verb /ˈɪnsɛns/

incense

Meaning
a substance burned for its sweet smell (noun); to make very angry (verb)
Example
The smell of incense filled the temple, but his rude words incensed her.
B2 verb /ɪnˈhæbɪt/

inhabit

Meaning
to live in; to occupy as a dwelling
Example
Many animals inhabit the forest.
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 ˈɪnʌndeɪt

inundate

Meaning
To flood; overwhelm someone or something with things or people to be dealt with
Example
The company was inundated with requests after the advertisement.
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.
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.
C1 adjective /ˌɪntərˈtwaɪnd/

intertwined

Meaning
closely connected or twisted together
Example
Their lives became deeply intertwined after the accident.
C1 adjective /ˌɪrɪˈprɛsəbl̩/

irrepressible

Meaning
Impossible to control or restrain.
Example
She had an irrepressible urge to laugh during the speech.
C2 noun /ˌɪnkænˈteɪʃən/

incantation

Meaning
a series of words used as a magic spell or charm
Example
The wizard chanted an incantation to summon the spirits.
C1 adjective /ˌɪnədˈvaɪzəbl/

inadvisable

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

immerse

Meaning
To involve oneself deeply in a particular activity or interest; to surround completely.
Example
Immerse yourself in the new language.
C2 verb /ɪnˈdaɪt/

indite

Meaning
To write or compose (literary or formal works).
Example
The poet indited a heartfelt sonnet.
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.
B2 noun /ˌɪnəˈbɪləti/

inability

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

ichthyology

Meaning
The branch of zoology that deals with fish.
Example
He pursued a degree in ichthyology at the university.
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 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 /ɪnˈsɪdiəs/

insidious

Meaning
Proceeding in a gradual, subtle way but with harmful effects.
Example
The insidious spread of misinformation can damage trust.
A2 noun /ˈɪlnəs/

illness

Meaning
A condition of being unwell or suffering from a disease.
Example
She missed school due to a serious illness.
C2 noun /ˈaɪdlər/

idler

Meaning
A person who avoids work or spends time lazily.
Example
He was known as an idler who wasted his days.
B2 noun ˈɪnər strɛŋkθ

inner strength

Meaning
Mental or spiritual power that helps a person cope with difficulties.
Example
Community service fosters inner strength in individuals.
C1 verb /ɪmˈpɛər/

impair

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

immolate

Meaning
To kill or sacrifice, especially by burning.
Example
The protesters threatened to immolate themselves in front of the building.
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.
C1 adverb /ɪnˈvɜːrs.li/

Inversely

Meaning
in a way that is opposite or contrary; in reverse order or manner
Example
The price of goods is inversely related to their availability in the market.
C1 adjective /ˌɪrɪˈvɜːrsəbl/

irreversible

Meaning
Not able to be undone, changed, or reversed.
Example
The damage caused by the fire was irreversible.
B2 adverb /ɪmˈpɔːtəntli/

importantly

Meaning
in a way that is of great significance or value
Example
Importantly, the report highlights the need for immediate action.
C2 noun /ɪmˈbroʊlioʊ/

imbroglio

Meaning
An extremely confused, complicated, or embarrassing situation.
Example
The political imbroglio lasted for months without resolution.
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 adjective /aɪˈrɒnɪk/

ironic

Meaning
happening in the opposite way to what is expected, often amusing or sarcastic
Example
It is ironic that the fire station burned down.
C2 adjective /ɪnˈɛstɪməbl/

inestimable

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

imbecility

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

incompetent

Meaning
Lacking the necessary ability or skills to do something successfully.
Example
He was fired because he was incompetent at his job.
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 noun /ˈɪntərˌloʊpər/

interloper

Meaning
A person who becomes involved in a situation or place where they are not wanted.
Example
He felt like an interloper at the private family gathering.
C2 adjective /ˌɪnɪkˈstrɪkəbl/

inextricable

Meaning
Impossible to separate or escape from.
Example
The two friends shared an inextricable bond.
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 /ˈɪmɪɡreɪt/

immigrate

Meaning
to come to live permanently in a foreign country
Example
He immigrated to Canada five years ago.
C1 adjective /ɪnˈstɪŋk.tɪv/

instinctive

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

inventive

Meaning
Having the ability to create or design new things or to think originally.
Example
The inventor was known for his inventive solutions to everyday problems.
C2 adjective /ˌɪndɪˈsɒljʊbl/

indissoluble

Meaning
Unable to be destroyed, broken, or dissolved.
Example
Marriage was once considered an indissoluble bond.
A2 noun /ˈɪndʒəri/

injury

Meaning
Harm or damage to a person’s body caused by an accident or attack.
Example
He suffered a serious injury during the football match.
B2 verb /ɪnˈʃʊər/

insure

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

importune

Meaning
To ask someone persistently or pressingly for something
Example
The child importuned his mother for a new toy.
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.
C2 adjective /ɪˈrɛfrəɡəbəl/

irrefragable

Meaning
Impossible to refute, deny, or break
Example
The lawyer presented irrefragable evidence that proved his client’s innocence.
C2 noun /ˈɪnsələns/

insolence

Meaning
rude or disrespectful behavior
Example
The teacher was shocked by the student's insolence.
A1 noun /ˌɪnfərˈmeɪʃən/

information

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

infernal

Meaning
relating to hell; extremely troublesome or annoying
Example
The workers complained about the infernal noise from the construction site.
C1 noun /ˌɪntərˈmiːdiˌɛri/

intermediary

Meaning
A person who acts as a link between people in order to try to bring about an agreement; a mediator.
Example
The diplomat served as an intermediary between the two conflicting nations.
C1 noun ˌɪnfɛsˈteɪʃən

infestation

Meaning
The presence of an unusually large number of insects or animals in a place, causing damage or disease.
Example
The infestation of ants in the kitchen led to immediate pest control measures.
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 adjective/noun /ɪˈrɑːki/

iraqi

Meaning
relating to Iraq or its people
Example
The Iraqi culture is rich and diverse.
C1 adjective /ˌɪnkənˈsiːvəbl̩/

inconceivable

Meaning
Impossible to imagine or believe; beyond comprehension.
Example
It seemed inconceivable that she could finish the marathon after such little training.
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.
C2 adjective /ˌɪndaɪˈdʒestəbəl/

Indigestible

Meaning
difficult or impossible to digest; hard to process in the stomach
Example
The old bread became hard and indigestible.
B1 noun /ɪnˈstrʌkʃənz/

instructions

Meaning
Detailed information on how something should be done or operated.
Example
Please follow the instructions on the box.
C2 noun /ɪnˈtɛmpərəns/

intemperance

Meaning
Lack of moderation or self-control, especially with drinking or eating.
Example
His intemperance in drinking ruined his health.
A2 noun /ˈɪn.sekt/

Insect

Meaning
a small invertebrate animal with six legs and usually one or two pairs of wings
Example
The butterfly is a beautiful insect that flies from flower to flower.
B1 verb /aɪˈdentɪfaɪ/

identify

Meaning
to recognize; to establish who someone is
Example
Can you identify the suspect?
C1 adjective /ˌɪndɪˈstrʌktəbl/

indestructible

Meaning
Impossible to destroy or break.
Example
The superhero's shield was said to be indestructible.
B1 adjective /ɪˈliː.ɡəl/

illegal

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

ingrained

Meaning
Firmly fixed or established; deeply rooted and difficult to change.
Example
His ingrained habits were hard to break.
C1 adverb /ɪnˈdɛfɪnətli/

indefinitely

Meaning
for an unlimited or unspecified period of time
Example
The project has been postponed indefinitely.
C1 noun /ˌɪnˈdɪsəplɪn/

indiscipline

Meaning
lack of discipline or self-control; failure to obey rules or maintain order
Example
Indiscipline among the students disrupted the learning environment.
C2 noun /ˈaɪ.lət/

islet

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

Impulse

Meaning
a sudden strong and unreflective urge or desire to act; a driving force or motivation
Example
She bought the expensive dress on impulse and later regretted the purchase.
B1 adjective /ɪnˈkrɛdəbl/

incredible

Meaning
so extraordinary that it is hard to believe; amazing
Example
The view from the mountain was incredible.
B1 verb /ɪnˈstɔːl/

install

Meaning
To place or fix equipment or software so it is ready for use.
Example
He installed the new software on his computer.
C1 adjective /ɪˈledʒ.ə.bəl/

illegible

Meaning
Not clear enough to be read; unreadable.
Example
The doctor’s handwriting was almost illegible.
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.
C1 noun /ˈaɪsətəʊp/

isotope

Meaning
Atoms of the same element with equal number of protons but different numbers of neutrons.
Example
Carbon-14 is a radioactive isotope used in dating fossils.
C1 adjective /ˈɪnfəməs/

infamous

Meaning
well known for some bad quality or deed
Example
The dictator was infamous for his cruelty.
A1 pronoun /aɪ/

i

Meaning
used by a speaker to refer to himself or herself
Example
I am learning English every day.
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 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.
B2 adjective /ɪnˈdɪf.ər.ənt/

indifferent

Meaning
having no particular interest or concern; not caring one way or another
Example
She was indifferent to the outcome of the match.
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.
C1 verb /ɪnˈfjʊərieɪt/

infuriate

Meaning
To make someone extremely angry.
Example
His careless remarks infuriated the entire team.
B2 adjective /ɪnˈklaɪnd/

inclined

Meaning
having a tendency or disposition toward something
Example
He is inclined to help those in need.
B1 adjective /ɪmˈpres.ɪv/

Impressive

Meaning
striking; remarkable; having the ability to impress
Example
Her impressive performance earned her a standing ovation.
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.
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.
C2 noun /ˌɪmprəˈsɑːrioʊ/

impresario

Meaning
A person who organizes or finances concerts, plays, or operas.
Example
The impresario arranged a series of concerts for the rising star.
C2 adjective /ɪnˈdjuːbɪtəbl/

indubitable

Meaning
Impossible to doubt; unquestionable.
Example
It is indubitable that hard work leads to success.
C1 noun /ɪnˈɛk.wɪ.ti/

inequity

Meaning
Lack of fairness or justice; unequal distribution or treatment.
Example
Social inequity continues to be a global issue.
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 noun, verb /ɪntʃ/

inch

Meaning
A unit of length equal to 2.54 centimeters; or to move slowly and carefully in small amounts.
Example
She inched closer to the edge of the stage.
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 /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.
B1 verb /ɪnˈvɑːlv/

involve

Meaning
to include as a necessary part, or to engage someone in an activity
Example
The project will involve several departments working together.
C1 adjective /ˌɪnɪkˈskjuːzəbl/

inexcusable

Meaning
Too bad to be justified or overlooked; unforgivable.
Example
His rude behavior was inexcusable.
C1 verb /ɪmˈpiːd/

impede

Meaning
To obstruct or hinder the progress or development of something.
Example
Lack of funds can impede business growth.
B1 verb /ɪnˈvɛnt/

invent

Meaning
to create or design something that has not existed before
Example
Thomas Edison invented the electric bulb.
B2 adjective /ɪnˈtækt/

intact

Meaning
Remaining whole, complete, and undamaged.
Example
Despite the storm, the old house remained intact.
B1 adjective /ɪnˈfɔːrməl/

Informal

Meaning
relaxed and friendly; not official or ceremonial; casual
Example
The meeting was informal and relaxed.
A2 verb /ɪnˈkluːd/

include

Meaning
to have as part of a whole; to contain or comprise
Example
The price includes all taxes.
C2 noun /ˈaɪ.kɒn/

ikon

Meaning
A religious image or symbol, especially in the Eastern Orthodox Church.
Example
The church displayed a beautifully painted ikon of the Virgin Mary.
A1 adjective /ɪmˈpɔː.tənt/

important

Meaning
Of great significance or value; likely to have a profound effect on success, survival, or well-being.
Example
Important steps must be taken to address pollution.
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 + 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 noun ˌɪn.toʊˈneɪ.ʃən

intonation

Meaning
The rise and fall of tone in speech and pronunciation.
Example
Proper intonation enhances the clarity of a speech.
A2 noun/verb /ˈɪntrəst/ or /ˈɪntəˌrɛst/

interest

Meaning
A feeling of curiosity or concern about something; or money paid for the use of borrowed money.
Example
He showed great interest in learning new languages.
C1 adjective /ɪmˈpɜːrviəs/

impervious

Meaning
Not allowing fluid to pass through; unable to be affected by something.
Example
The jacket is impervious to rain.
C2 adjective /ˈɪnfəntaɪl/

infantile

Meaning
characteristic of an infant; childish
Example
His infantile behavior embarrassed everyone at the meeting.
C2 noun /ˌɪn.strəˈmɛn.təl.ɪst/

instrumentalist

Meaning
A person who plays a musical instrument.
Example
The instrumentalist played a beautiful solo on the violin.
A2 verb /ɪnˈvaɪtɪd/

invited

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