intimidation
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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.
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 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.
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 noun /ˌɪndɪɡˈneɪʃən/

indignation

Meaning
Strong displeasure or anger caused by something unjust, offensive, or insulting.
Example
Public indignation grew after the unfair verdict.
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 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 noun /ˌɪnkɑːrˈneɪʃən/

incarnation

Meaning
the embodiment of a deity, spirit, or quality in a physical form
Example
The monk was considered the incarnation of compassion.
C1 noun /ɪˈmɜː.ʃən/

immersion

Meaning
Complete engagement in an environment or experience.
Example
Immersion in VR games makes users feel like they are inside the virtual world.
C1 adjective /ɪnˈɔːdəbl/

inaudible

Meaning
Unable to be heard.
Example
Her voice was almost inaudible over the noise.
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.
C1 adjective ɪnˈdʒiː.ni.əs

ingenious

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

importation

Meaning
The act of bringing goods or services into a country from abroad
Example
The importation of luxury goods is strictly regulated.
C1 adjective /ɪˈmækjələt/

immaculate

Meaning
perfectly clean, neat, or free from flaws
Example
Her room was immaculate, with everything in its place.
C1 adjective ɪnɪɡˈzɔːstɪbəl

inexhaustible

Meaning
Unable to be used up or worn out; limitless.
Example
His inexhaustible energy allowed him to work tirelessly on his projects.
C1 adjective /ɪnˈvɪnsəbl/

invincible

Meaning
too powerful to be defeated or overcome
Example
The team seemed invincible after winning ten matches in a row.
C1 adjective /ɪmˈpʌlsɪv/

impulsive

Meaning
acting suddenly without careful thought
Example
She made an impulsive decision to buy the car.
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.
C1 adjective /ɪnˈfriːkwənt/

infrequent

Meaning
Happening rarely or not often.
Example
He made infrequent visits to his hometown after moving abroad.
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.
C1 noun /ˈɪnlɛt/

inlet

Meaning
A small arm of the sea, a lake, or a river; an opening or passage for entry.
Example
The boat entered a narrow inlet along the coast.
C1 verb /ɪˈnɔːɡjʊreɪt/

inaugurate

Meaning
To formally begin or introduce something, especially with a ceremony.
Example
The mayor will inaugurate the new bridge tomorrow.
C1 adjective /ɪnˈkɒŋɡruəs/

incongruous

Meaning
Not fitting in with or suitable for the surroundings.
Example
His jokes were incongruous during the serious meeting.
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 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 adjective, noun /ˈɪnvəlɪd/ (adjective), /ɪnˈvælɪd/ (noun)

invalid

Meaning
Not valid; having no force or effect. Also refers to a person too weak or ill to care for themselves.
Example
The court declared the contract invalid.
C1 noun ɪnˈdʌldʒəns

indulgence

Meaning
The practice of allowing oneself to enjoy the pleasure of something.
Example
His indulgence in junk food affected his health.
C1 adjective /aɪˈdɪlɪk/

idyllic

Meaning
Like an idyll; extremely happy, peaceful, or picturesque.
Example
They enjoyed an idyllic vacation by the sea.
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 /ˌɪnɪkˈsplɪkəbl/

inexplicable

Meaning
Impossible to explain or understand.
Example
The sudden disappearance of the file was inexplicable.
C1 verb /ɪnˈdaɪt/

indict

Meaning
to formally accuse someone of committing a serious crime
Example
The grand jury decided to indict the politician for corruption.
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 /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 /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.
C1 verb /ɪɡˈnaɪt/

ignite

Meaning
To catch fire or cause to catch fire; to start or arouse.
Example
The sparks ignited the dry leaves in seconds.
C1 adjective /ɪnˈɡreɪnd/

ingrained

Meaning
Firmly fixed or established; deeply rooted and difficult to change.
Example
His ingrained habits were hard to break.
C1 adjective ɪˈluː.sər.i

illusory

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

impediments

Meaning
A hindrance or obstruction in doing something; things that prevent progress or achievement.
Example
Economic impediments often hinder social development.
C1 noun /ɪnˈækjʊrəsi/

inaccuracy

Meaning
lack of accuracy or precision; an incorrect or wrong detail
Example
The report contained several factual inaccuracies.
C1 adjective /ˌɪnkəmˈpætəbl/

incompatible

Meaning
Not able to exist or work together without conflict.
Example
Their personalities were completely incompatible.
C1 adjective /ˌɪmprɪˈsaɪs/

imprecise

Meaning
Not exact or accurate; vague.
Example
His explanation was too imprecise to be helpful.
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 /ɪnˈsɪnjueɪt/

insinuate

Meaning
To suggest or hint something indirectly and often unpleasantly.
Example
He insinuated that she had lied about her qualifications.
C1 noun ˌɪntədɪˈpɛndənsi

interdependency

Meaning
The dependence of two or more people or things on each other.
Example
The interdependency of the countries led to greater cooperation.
C1 adjective /ˌɪntərˈtwaɪnd/

intertwined

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

Irrespective

Meaning
without taking something into account; regardless of
Example
All students will be treated equally, irrespective of their background.
C1 verb /ˈɪnsjuleɪt/

insulate

Meaning
To protect something by covering it, especially to prevent heat, sound, or electricity from escaping or entering.
Example
The house was insulated to reduce heating costs.
C1 noun /ɪnˈsek.tɪ.saɪd/

Insecticide

Meaning
a substance used for killing insects; a chemical pesticide that targets insects
Example
The farmer sprayed insecticide on his crops to protect them from harmful bugs.
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 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 /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 noun /ˈɪnsɪdəns/

incidence

Meaning
the occurrence, rate, or frequency of something
Example
The incidence of road accidents has decreased this year.
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 /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 /ɪmˈprɒbəbl/

improbable

Meaning
Not likely to be true or to happen.
Example
It seems improbable that he will arrive on time.
C1 adjective /ˈɪntrɪkət/

intricate

Meaning
very detailed, complex, and difficult to understand
Example
The artist created an intricate pattern on the wall.
C1 noun /ɪmˈpɜː.mə.nəns/

impermanence

Meaning
The state or fact of lasting for only a limited period of time.
Example
The philosophy of Buddhism emphasizes the impermanence of life.
C1 adjective /ˌɪnəˈtɛntɪv/

inattentive

Meaning
not paying attention; lacking focus or concentration
Example
The inattentive student missed several important instructions.
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 /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 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.
C1 noun (plural) /ˈɪndɪˌsiːz/

indices

Meaning
plural form of index; statistical measures or reference points used for comparison
Example
Stock market indices fell sharply after the announcement.
C1 noun /ˈɪrɪtənt/

irritant

Meaning
something that causes irritation or discomfort
Example
Dust is a common irritant for people with allergies.
C1 verb /ˈɪnstɪˌɡeɪt/

instigate

Meaning
To bring about or initiate an action, often something negative.
Example
He was accused of instigating the riot.
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.
C1 noun /ɪmˈpɒs.tər/

Impostor

Meaning
a person who pretends to be someone else in order to deceive others; a fraud
Example
The impostor convinced everyone he was a doctor until his fake credentials were discovered.
C1 verb /ˈɪmplɪˌkeɪt/

implicate

Meaning
To show someone’s involvement in a crime or wrongdoing.
Example
The evidence implicated several officials in the scandal.
C1 verb /ɪnˈvælɪdeɪt/

invalidate

Meaning
To make something not valid or legally acceptable.
Example
The new evidence may invalidate the previous ruling.
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.
C1 noun /ɪnˈdem.nə.ti/

Indemnity

Meaning
security or protection against a loss or other financial burden; compensation for damage or loss
Example
The insurance company provided full indemnity for the damages caused by the flood.
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.
C1 verb /ɪnˈsaɪt/

incite

Meaning
to provoke; to stir up
Example
His speech incited the crowd to violence.
C1 adjective /ɪnˈdɪɡnənt/

indignant

Meaning
Feeling or showing anger at something considered unfair or unjust.
Example
She was indignant when accused of cheating.
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 adjective /ɪmˈpæsɪv/

impassive

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

Inverse

Meaning
opposite in order, nature, or effect; reversed
Example
There is an inverse relationship between price and demand.
C1 adjective /ɪˈnɔːrdənət/

inordinate

Meaning
Excessive or unusually large in degree.
Example
She spent an inordinate amount of time on her phone.
C1 noun /ˌɪntəkəˈnɛktɪvɪti/

interconnectivity

Meaning
The state of being interconnected or the degree of connectivity between components
Example
The rise of interconnectivity has transformed global communication.
C1 verb /ɪnˈkɜːr/

incur

Meaning
To bring upon oneself something undesirable, usually as a result of actions.
Example
He incurred a fine for parking in the wrong place.
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 verb /ɪmˈplɔːr/

implore

Meaning
To beg someone earnestly or desperately to do something.
Example
She implored him to stay with her.
C1 verb /ɪnˈtruːd/

intrude

Meaning
To enter a place or situation where one is not wanted or not invited.
Example
He felt embarrassed to intrude on their private conversation.
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.
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 /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 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 noun /ɪnˈsaɪtmənt/

incitement

Meaning
the action of provoking unlawful or violent behavior
Example
He was arrested for incitement to riot.
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 noun /ˌɪn.dʒəˈnjuː.ɪ.ti/

ingenuity

Meaning
The quality of being clever, original, and inventive.
Example
His ingenuity led to groundbreaking innovations.
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 /ɪnˈsɜːʃən/

insertion

Meaning
the action of inserting something into something else
Example
The insertion of the new data was completed successfully.
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 /ɪnˈklaɪn/

incline

Meaning
to feel willing or favorably disposed toward something; to bend or tilt
Example
She is inclined to agree with the proposal.
C1 noun /ɪnˈkɜːrʒən/

incursion

Meaning
A sudden attack or invasion into a place or territory.
Example
The army repelled the enemy incursion at the border.
C1 adjective /ˌɪnɑːrˈtɪkjʊlət/

inarticulate

Meaning
Unable to express oneself clearly or effectively in speech or writing.
Example
She became inarticulate with emotion during the speech.
C1 noun /ɪˈmiːdiəsi/

immediacy

Meaning
The quality of bringing one into direct and instant involvement with something, giving rise to a sense of urgency or excitement.
Example
The immediacy of digital communication has reshaped business operations.
C1 noun /ˌɪntərˈdʒɛkʃən/

interjection

Meaning
a word or phrase used to express sudden emotion or reaction, often standing alone
Example
Words like 'wow' and 'ouch' are common interjections in English.
C1 adjective /ɪˈledʒ.ə.bəl/

illegible

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

impeach

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

irrational

Meaning
not logical or reasonable; lacking clear thought
Example
His fear of the dark was completely irrational.
C1 verb /ˌɪntəˈsɛkt/

intersect

Meaning
to cross or pass through each other
Example
The two roads intersect at the city center.
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 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 noun /ˈɪn.tə.lekt/

intellect

Meaning
The ability to think, reason, and understand objectively.
Example
Her intellect is admired by all her colleagues.
C1 adverb /ˌɪn.dɪˈskrɪm.ɪ.nət.li/

Indiscriminately

Meaning
without making careful distinctions; randomly; without discrimination
Example
The company fired employees indiscriminately without considering their performance.
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 /ˈaɪərnˌklæd/

ironclad

Meaning
impossible to change, break, or dispute; very strong and firm
Example
The company had an ironclad contract with its suppliers.
C1 noun /ɪnˈdjuːsmənt/

inducement

Meaning
something that persuades or encourages someone to do something
Example
The company offered a bonus as an inducement to employees.
C1 noun /ˌɪm.pəˈzɪʃ.ən/

Imposition

Meaning
the action or process of imposing something or of being imposed; an unfair burden or demand
Example
The imposition of new taxes without consultation angered the citizens greatly.
C1 adjective /ɪnˈtɒl.ər.ə.bəl/

Intolerable

Meaning
unable to be endured; extremely unpleasant or painful
Example
The noise from the construction site was intolerable.
C1 adjective /ɪnˈsɛp(ə)rəbəl/

inseparable

Meaning
Unable to be separated or always together.
Example
The two friends have been inseparable since childhood.
C1 verb /ɪnˈskraɪb/

inscribe

Meaning
to write or carve words or symbols on a surface
Example
They inscribed her name on the trophy.
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 verb /ˌɪn.trəˈspekt/

introspect

Meaning
To examine one's own thoughts, feelings, or mental state.
Example
He often introspects before making important decisions.
C1 adjective /ɪˈmuː.və.bəl/

immovable

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