impersonal
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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 noun /ˌɪn.səˌbɔːr.dɪˈneɪ.ʃən/

insubordination

Meaning
Defiance of authority; refusal to obey orders.
Example
The soldier was punished for insubordination during the mission.
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 adverb /ˌɪn.ədˈvɜːr.tənt.li/

Inadvertently

Meaning
without being aware of what you are doing; unintentionally; by mistake
Example
She inadvertently deleted the important file while cleaning her computer.
C1 adjective /ɪmˈpæsɪv/

impassive

Meaning
Not showing or feeling emotion; expressionless.
Example
Despite the shocking news, she remained impassive.
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.
C1 verb /ɪmˈplɔːr/

implore

Meaning
To beg someone earnestly or desperately to do something.
Example
She implored him to stay with her.
C1 adjective /ɪˈmuː.və.bəl/

immovable

Meaning
Not able to be moved; fixed in position.
Example
Immovable barriers prevent change.
C1 verb /ɪnˈvoʊk/

invoke

Meaning
to call upon a higher power, authority, or principle for help, support, or justification
Example
The lawyer invoked the constitution to defend his client.
C1 verb /ɪnˈfrɪndʒ/

infringe

Meaning
To actively break the terms of a law, agreement, or right.
Example
Copying this software without permission will infringe copyright laws.
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 adjective /ˌɪnsɪˈdɛntəl/

incidental

Meaning
happening as a minor part or in connection with something else
Example
Incidental expenses like snacks and tips were included in the bill.
C1 adjective /ɪmˈprɒmp.tjuː/

impromptu

Meaning
Done without being planned, organized, or rehearsed; spontaneous.
Example
He gave an impromptu speech at the event.
C1 noun /ˌɪn.trəˈspek.ʃən/

introspection

Meaning
The examination or observation of one's own mental and emotional processes; self-reflection.
Example
Through introspection, she gained insight into her emotions.
C1 adjective /ˌɪrɪˈvɜːrsəbl/

irreversible

Meaning
Not able to be undone, changed, or reversed.
Example
The damage caused by the fire was irreversible.
C1 noun /ˌɪməˈrælɪti/

immorality

Meaning
the quality of being immoral; behavior that violates accepted moral standards
Example
The community condemned the immorality of the corrupt officials.
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 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 /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 /ˌɪn.trəˈvɜːr.ʒən/

introversion

Meaning
The tendency to be inward-looking and shy, preferring solitary activities.
Example
Her introversion made it difficult for her to enjoy large parties.
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.
C1 adjective /ˈɪndɪɡoʊ bluː/

Indigo-blue

Meaning
a deep blue color with a purplish tinge
Example
The indigo-blue sky looked magnificent at twilight.
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 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 /ɪmˈpɛtʃ.u.əs/

impetuous

Meaning
Acting or done quickly and without thought or care; impulsive.
Example
His impetuous decision led to unexpected consequences.
C1 adjective /ˌɪnɪkˈskjuːzəbl/

inexcusable

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

insertion

Meaning
the action of inserting something into something else
Example
The insertion of the new data was completed successfully.
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.
C1 noun ɪnˈsɒl.vən.si

insolvency

Meaning
The state of being unable to pay debts owed; bankruptcy.
Example
The company declared insolvency after years of losses.
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.
C1 adjective /ɪˈrɛfjʊtəbəl/

Irrefutable

Meaning
impossible to deny or disprove; undeniable
Example
The evidence against him was irrefutable.
C1 adjective /ɪnˈvɜːs/

Inverse

Meaning
opposite in order, nature, or effect; reversed
Example
There is an inverse relationship between price and demand.
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 adjective ˌɪdiəsɪnˈkrætɪk

idiosyncratic

Meaning
Relating to idiosyncrasy; peculiar or individual.
Example
His idiosyncratic behavior set him apart from his colleagues.
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.
C1 adjective /ɪnˈtjuː.ɪ.tɪv/

intuitive

Meaning
Based on instinctive understanding rather than reasoning.
Example
The software has an intuitive design that makes it easy to use.
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 /ɪnˈfɜːm/

infirm

Meaning
Weak, especially due to old age or illness.
Example
The infirm old man needed assistance to walk.
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.
C1 noun ɪnˈdɪdʒɪnəs trəˈdɪʃənz

Indigenous Traditions

Meaning
Cultural practices, beliefs, and customs that have been passed down through generations among native peoples.
Example
Indigenous traditions in the Chittagong Hill Tracts are unique.
C1 adjective ˌɪn.təˈmɪt.ənt

intermittent

Meaning
Happening irregularly, not continuously.
Example
The rain was intermittent throughout the day.
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 adjective /ˌɪnkənˈsɪdərət/

inconsiderate

Meaning
Thoughtless; showing a lack of concern for others.
Example
It was inconsiderate of him to play loud music late at night.
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 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 adjective /ˌɪn.səbˈstæn.ʃəl/

insubstantial

Meaning
Lacking strength, substance, or solidity.
Example
The evidence provided was insubstantial and unconvincing.
C1 verb /ɪˈmɔːrtəlaɪz/

immortalize

Meaning
to preserve the memory of someone or something forever
Example
The statue was built to immortalize the hero’s sacrifice.
C1 adjective /ˌɪndɪˈstrʌktəbl/

indestructible

Meaning
Impossible to destroy or break.
Example
The superhero's shield was said to be indestructible.
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.
C1 adjective /ˌɪnədˈvaɪzəbl/

inadvisable

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

incompatibility

Meaning
the state of being unable to exist or work together harmoniously; lack of compatibility
Example
The project failed because of incompatibility between the two software systems.
C1 noun /ˌɪrɪˌspɒnsəˈbɪləti/

irresponsibility

Meaning
lack of responsibility or accountability; failure to act in a reliable or sensible way
Example
The accident was caused by his irresponsibility at work.
C1 noun /ɪnˈsaɪtmənt/

incitement

Meaning
the action of provoking unlawful or violent behavior
Example
He was arrested for incitement to riot.
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.
C1 noun /ɪnˈdaɪtmənt/

indictment

Meaning
a formal charge or accusation of a serious crime
Example
The indictment accused the company of multiple violations.
C1 adjective /ɪnˈdʒʊəriəs/

injurious

Meaning
Causing or likely to cause harm or damage.
Example
Smoking is injurious to health.
C1 noun /ɪnˈtruː.ʒən/

intrusion

Meaning
Unauthorized entry into a system or place without permission
Example
The company detected an intrusion in its server.
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 /ˌɪn.dɪˈsɪʒ.ən/

Indecision

Meaning
the inability to make decisions quickly; uncertainty about what to do
Example
Her indecision about which job offer to accept caused her to miss both opportunities.
C1 noun /ɪnˈkɒmpɪtəns/

incompetence

Meaning
Lack of ability, skill, or effectiveness in doing something.
Example
The project failed due to the manager’s incompetence.
C1 adjective /ɪnˈfleɪtɪd/

inflated

Meaning
excessively increased in size, value, or importance; filled with air or gas
Example
The company faced criticism for its inflated prices.
C1 adjective /ˌɪntərˈtwaɪnd/

intertwined

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

intimidate

Meaning
To frighten or overawe someone, especially to make them do what one wants.
Example
The bully tried to intimidate the smaller kids.
C1 verb /ɪˈluːmɪneɪt/

illuminate

Meaning
To light up or make something clearer.
Example
Streetlights illuminate the road at night.
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.
C1 adjective ɪnˈdel.ə.bəl

indelible

Meaning
Making marks that cannot be removed; impossible to forget or remove.
Example
Her speech left an indelible mark on the audience.
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.
C1 adjective /ɪnˈɔːdəbl/

inaudible

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

Inland

Meaning
Situated in the interior of a country; away from the coast.
Example
Inland transport boosts local trade.
C1 noun /ˈɪŋ.krə.mənt/

Increment

Meaning
an increase or addition, especially one of a series on a fixed scale; a regular increase in salary
Example
He received an annual increment of five percent in his salary this year.
C1 adjective /ˌɪndɪˈstɪŋkt/

indistinct

Meaning
Not clear or sharply defined; vague or blurred.
Example
The sound of voices was indistinct in the distance.
C1 adjective /ˌɪnsərˈmaʊntəbl/

insurmountable

Meaning
Too great to be overcome.
Example
The explorers faced insurmountable odds in the desert.
C1 adjective /ɪnˈflɛksəbl/

inflexible

Meaning
Not able to bend or change; unwilling to change ideas or behavior.
Example
His inflexible attitude made negotiations difficult.
C1 adjective /ɪnˈhɛrənt/

inherent

Meaning
Existing in something as a natural, permanent, or essential quality.
Example
There are inherent risks in extreme sports.
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 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 /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.
C1 verb /ɪmˈpɑːrt/

impart

Meaning
to make information known; to bestow or communicate
Example
The teacher imparted valuable knowledge to her students.
C1 verb /ɪnˈfleɪm/

inflame

Meaning
to arouse strong feelings or provoke anger; to cause inflammation in the body
Example
The politician's remarks served to inflame public opinion.
C1 noun /ˌɪmɔːrˈtæləti/

immortality

Meaning
the state of living forever; eternal life or lasting fame beyond death
Example
Many ancient cultures believed that heroes could achieve immortality through great deeds.
C1 noun /ˈɪn.fən.tri/

Infantry

Meaning
soldiers marching or fighting on foot; foot soldiers collectively
Example
The infantry advanced across the battlefield on foot.
C1 adjective ˌɪn.trəˈspek.tɪv

introspective

Meaning
Characterized by or given to introspection; examining one's own thoughts and feelings.
Example
Writers tend to be highly introspective individuals.
C1 verb /aɪˈdiː.ə.laɪz/

idealize

Meaning
To regard or represent something as perfect or better than it really is.
Example
Children often idealize their parents.
C1 noun ˌɪn.fɪlˈtreɪ.ʃən

infiltration

Meaning
The process of entering or gaining access to an organization or place surreptitiously.
Example
Cybersecurity prevents infiltration into sensitive data.
C1 adverb /ˈɪnwərdli/

inwardly

Meaning
In the mind or spirit; not outwardly visible.
Example
She smiled outwardly but inwardly she was worried.
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.
C1 adjective /ɪmˈpæʃənd/

impassioned

Meaning
Filled with or showing great emotion.
Example
She gave an impassioned speech about human rights.
C1 adjective /ɪmˈpɜːmiəbl/

impermeable

Meaning
Not allowing fluid or gas to pass through.
Example
The container is made of impermeable plastic.
C1 adjective /ɪnˈvɑːlənˌtɛri/

involuntary

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

impeach

Meaning
To charge a public official with misconduct while in office.
Example
The parliament voted to impeach the president.
C1 noun /ˌɪnklɪˈneɪʃən/

inclination

Meaning
A natural tendency or urge to act or feel in a particular way.
Example
She has an inclination towards helping others.
C1 adjective /ɪˈmeʒərəbəl/

Immeasurable

Meaning
too large or extensive to measure; boundless
Example
The immeasurable love of a mother knows no bounds.
C1 adjective /ɪnˈtɛlɪdʒəbl/

intelligible

Meaning
Able to be understood; clear enough to be comprehended.
Example
Her speech was barely intelligible over the noise.
C1 adjective /ˈɪɡ.ni.əs/

igneous

Meaning
Formed through the cooling and solidification of magma or lava.
Example
Granite is an igneous rock commonly used in construction.
C1 adjective /ɪnˈhɪbɪtɪd/

inhibited

Meaning
Unable to act in a relaxed and natural way, especially due to self-consciousness or restraint.
Example
He was too inhibited to express his true feelings.
C1 adjective ˌɪm.pəˈsɛp.tɪ.bəl

imperceptible

Meaning
So subtle or gradual that it is difficult to notice or perceive
Example
The changes in his behavior were imperceptible at first.
C1 noun /ɪnˈsɒm.ni.ə/

Insomnia

Meaning
habitual sleeplessness; inability to sleep; the condition of being unable to sleep
Example
Her chronic insomnia made it difficult for her to concentrate during work hours.
C1 adjective /ɪnˈtræk.tə.bəl/

intractable

Meaning
Difficult or impossible to manage, control, or solve.
Example
The conflict has become an intractable problem.
C1 noun /ɪmˈpɛd.ɪ.mənt/

impediment

Meaning
A hindrance or obstruction in doing something; something that prevents progress.
Example
Lack of funds is a major impediment to the project.
C1 noun ˌɪnˈsaɪtfʊlnɪs

insightfulness

Meaning
The capacity to gain an accurate and deep intuitive understanding of a person or thing.
Example
His insightfulness helped solve the complex problem.
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 adjective /ˌɪn.səˈbɔːr.dɪ.nət/

insubordinate

Meaning
Defiant of authority; disobedient to orders.
Example
The insubordinate employee refused to follow the manager's instructions.
C1 adjective /ɪmˈpɛn.ɪ.trə.bəl/

impenetrable

Meaning
Impossible to pass through or enter; impossible to understand.
Example
The dense forest was nearly impenetrable.
C1 adjective /ɪˈrɛvərənt/

irreverent

Meaning
showing a lack of respect for people or things that are usually respected
Example
The comedian’s irreverent jokes offended some of the audience.
C1 adjective /ɪnˈsɪdiəs/

insidious

Meaning
Proceeding in a gradual, subtle way but with harmful effects.
Example
The insidious spread of misinformation can damage trust.
C1 noun /ˌɪnækˈtɪvɪti/

inactivity

Meaning
the state of not being active physically or mentally; lack of action
Example
Prolonged inactivity can negatively affect both physical and mental health.
C1 adjective /ˌɪndɪˈsaɪsɪv/

Indecisive

Meaning
unable to make decisions quickly; hesitant; wavering
Example
She was indecisive about which university to attend.
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.
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.
C1 adjective ɪnˈdʒiː.ni.əs

ingenious

Meaning
Showing inventiveness and skill; clever, original, and inventive.
Example
His ingenious ideas transformed modern physics.
C1 adjective /ɪnˈsteɪbəl/

instable

Meaning
not stable; liable to change, collapse, or fail; lacking firmness or reliability
Example
The instable political situation worried foreign investors.
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 /ˌɪrɪˈprɛsəbl̩/

irrepressible

Meaning
Impossible to control or restrain.
Example
She had an irrepressible urge to laugh during the speech.
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.
C1 noun /ɪnˈædɪkwəsi/

inadequacy

Meaning
lack of sufficient ability, quality, or strength; a feeling of not being good enough
Example
She struggled with feelings of inadequacy at work despite her strong qualifications.
C1 verb /ɪnˈkɑːrsəreɪt/

incarcerate

Meaning
to imprison or confine someone
Example
The authorities incarcerated the criminal after the trial.
C1 noun ɪˌræʃ.ənˈæl.ɪ.ti

irrationality

Meaning
The quality of being illogical or unreasonable; lack of rational thought.
Example
His decision was driven by complete irrationality.
C1 noun /ˈɪmɪdʒəri/

imagery

Meaning
visually descriptive or figurative language, especially in a literary work
Example
The poet's use of imagery brought the scene to life.
C1 adjective ɪmˈpɛkəbl

impeccable

Meaning
In accordance with the highest standards; faultless.
Example
His impeccable taste in fashion was admired by all his peers.