intertwine
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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 adjective /ɪmˈpoʊzɪŋ/

imposing

Meaning
having an appearance that is grand, impressive, or commanding
Example
The castle is an imposing structure overlooking the valley.
B1 adjective /ɪnˈkrɛdəbl/

incredible

Meaning
so extraordinary that it is hard to believe; amazing
Example
The view from the mountain was incredible.
C1 adjective /ˌɪnɔːrˈɡænɪk/

inorganic

Meaning
relating to substances that are not derived from living organisms; lacking organic structure or growth
Example
Inorganic compounds are commonly studied in chemistry labs.
C2 noun /ˌɪnsəˈrɛkʃən/

insurrection

Meaning
A violent uprising against an authority or government.
Example
The army was called in to suppress the insurrection.
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.
C1 adjective /ɪmˈpæsəbəl/

impassable

Meaning
Impossible to travel along or over.
Example
The road became impassable after the heavy snowfall.
A2 noun /ˌɪn.trəˈdʌk.ʃən/

introduction

Meaning
the action of introducing something or someone; an opening or beginning part
Example
The professor gave a brief introduction before starting the lecture.
B2 adjective /ˌɪnəˈproʊpriət/

inappropriate

Meaning
not suitable or proper in the circumstances
Example
It was inappropriate to talk loudly in the library.
C1 adjective ɪnˈsaɪ.sɪv

incisive

Meaning
Intelligently analytical and clear-thinking; showing clear thought and good understanding of what is important.
Example
His incisive comments revealed the core issues.
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.
B1 adjective /ɪnˈfɔːrməl/

Informal

Meaning
relaxed and friendly; not official or ceremonial; casual
Example
The meeting was informal and relaxed.
C1 adjective /ɪnˈsɪstənt/

insistent

Meaning
demanding something firmly and refusing to accept no
Example
The child was insistent on getting a new toy.
B2 noun /ˈɪnstɪŋkt/

instinct

Meaning
A natural way of behaving or reacting that does not require learning.
Example
Birds build nests by instinct.
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 adjective /ˌɪn.dɪˈspen.sə.bəl/

indispensable

Meaning
Absolutely necessary, essential
Example
Water is indispensable for human survival.
B1 verb /ˌɪntəˈrʌpt/

interrupt

Meaning
to stop someone from speaking or doing something by suddenly saying or doing something
Example
She tried not to interrupt while he was speaking.
C1 adjective /ɪˈnɜːrt/

inert

Meaning
lacking the ability or strength to move or act; chemically inactive
Example
The patient remained inert on the bed.
C2 verb /ɪmˈpeɪl/

impale

Meaning
to pierce or fix something with a sharp object
Example
The knight was impaled by the enemy’s spear.
C2 noun /ɪnˌtɜːrpəˈleɪʃən/

interpolation

Meaning
The act of inserting something into a text or estimating values within a sequence of data.
Example
The scientist used interpolation to predict the missing data points.
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.
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.
C1 adjective /ˈɪmpjəd(ə)nt/

impudent

Meaning
not showing due respect for another person; rude
Example
The impudent child talked back to the teacher.
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 verb /ˈɪnstɪˌɡeɪt/

instigate

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

induct

Meaning
to formally admit someone into a position, organization, or office
Example
She was inducted into the university's honor society.
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 adjective /ˌɪnkænˈdɛsənt/

incandescent

Meaning
emitting light as a result of being heated; extremely bright or passionate
Example
The incandescent lamp lit up the entire hall.
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.
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.
B1 verb /ɪnˈsɪst/

insist

Meaning
to demand firmly; to state persistently
Example
He insisted on paying the bill.
C1 adjective /ˈɪnbɔːrn/

Inborn

Meaning
existing from birth; natural; inherent
Example
She has an inborn talent for music.
C2 noun /ɪnˈsɪpiəns/

incipience

Meaning
the beginning or initial stage of something
Example
The project was still in its incipience when funding was approved.
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.
C2 noun /ɪnˈkwɪzɪtər/

inquisitor

Meaning
A person who asks many questions, often in an official or harsh manner.
Example
The inquisitor demanded detailed answers from the witness.
C1 noun /ɪˈreləvəns/

irrelevance

Meaning
the quality of not being connected to or important for a particular matter; lack of significance
Example
His long explanation only highlighted the irrelevance of the details to the main issue.
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.
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.
B2 noun /ˌɪnstəˈbɪləti/

instability

Meaning
lack of stability or balance; tendency to change, fail, or collapse easily
Example
Political instability has slowed economic growth in the region.
B2 adjective /ɪnˈvɪz.ə.bəl/

Invisible

Meaning
unable to be seen; not visible to the eye
Example
The bacteria are invisible without a microscope.
C2 verb /ɪˈluːmɪn/

illumine

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

inherent

Meaning
Existing in something as a natural, permanent, or essential quality.
Example
There are inherent risks in extreme sports.
B2 noun /ɪnˈdʒɛkʃən/

injection

Meaning
the act of introducing a substance into the body through a needle
Example
The nurse gave me an injection to prevent the infection.
C1 adjective /ɪnˈflɛksəbl/

inflexible

Meaning
Not able to bend or change; unwilling to change ideas or behavior.
Example
His inflexible attitude made negotiations difficult.
C2 noun /ˈaɪ.səˌbɑːr/

isobar

Meaning
A line on a weather map connecting points of equal atmospheric pressure.
Example
The meteorologist explained how isobars indicate wind speed and direction.
C1 verb /ɪnˈfjʊərieɪt/

infuriate

Meaning
To make someone extremely angry.
Example
His careless remarks infuriated the entire team.
B2 noun /ˌaɪ.səˈleɪ.ʃən/

Isolation

Meaning
the process or fact of isolating or being isolated; separation from other people or things
Example
The patient was kept in isolation to prevent the spread of the infectious disease.
B2 verb /ɪmˈplaɪ/

imply

Meaning
To suggest something without directly stating it.
Example
Her tone seemed to imply that she was upset.
C1 noun ˌɪrɪˈvɜːrsəbl ˈdæmɪdʒ

irreversible damage

Meaning
Harm or injury that cannot be undone or repaired.
Example
Climate change causes irreversible damage to ecosystems.
C1 adjective /ɪnˈstrʌktɪv/

instructive

Meaning
useful and informative; providing knowledge or instruction
Example
The lecture was highly instructive and engaging.
C2 noun /ˈɪndələns/

indolence

Meaning
Avoidance of activity or exertion; laziness.
Example
His indolence kept him from finishing the project on time.
C2 adjective /ɪˈræsɪbl/

irascible

Meaning
Easily angered; quick-tempered.
Example
His irascible nature often got him into trouble.
B2 verb /ɪnˈsɜːrt/

insert

Meaning
to put or place something into something else
Example
Please insert the key into the lock.
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.
A2 adverb /ɪˈmiːdiətli/

immediately

Meaning
at once; without delay
Example
She responded immediately to the emergency call.
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 verb /ɪnˈdaɪt/

indite

Meaning
To write or compose (literary or formal works).
Example
The poet indited a heartfelt sonnet.
C1 adjective /ˈɪnərmoʊst/

Innermost

Meaning
most private and secret; deepest; most personal
Example
She shared her innermost feelings with her closest friend.
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 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.
C2 noun /ɪnˈtɜːrmənt/

interment

Meaning
The act of burying a dead body in a grave or tomb.
Example
The interment took place at the family cemetery.
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 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.
C2 verb /ˈɪməleɪt/

immolate

Meaning
To kill or sacrifice, especially by burning.
Example
The protesters threatened to immolate themselves in front of the building.
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.
C2 adjective/noun /ɪnˈkɑːrnədiːn/

incarnadine

Meaning
a bright crimson or pinkish-red color
Example
The sky turned incarnadine at sunset.
A2 adverb /ˌɪnˈdɔːrz/

indoors

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

intercede

Meaning
to act or plead on behalf of someone in difficulty or trouble; to intervene between parties to help resolve a dispute
Example
She interceded with the teacher to give her brother another chance.
B1 adjective /ˌɪmpəˈlaɪt/

impolite

Meaning
Not showing good manners; rude.
Example
It is impolite to interrupt someone while they are speaking.
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.
C1 verb /ɪnˈkɑːrsəreɪt/

incarcerate

Meaning
to imprison or confine someone
Example
The authorities incarcerated the criminal after the trial.
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.
A2 adjective/noun /ˈaɪrɪʃ/

irish

Meaning
relating to Ireland, its people, or its language
Example
The Irish countryside is very beautiful.
C1 adjective /ɪˈræʃənəl/

irrational

Meaning
not logical or reasonable; lacking clear thought
Example
His fear of the dark was completely irrational.
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.
B1 adjective /ˌɪnɪkˈspɛnsɪv/

Inexpensive

Meaning
not costing a lot of money; affordable; budget-friendly
Example
This restaurant offers delicious and inexpensive meals for students.
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.
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 adjective ˌɪdiəsɪnˈkrætɪk

idiosyncratic

Meaning
Relating to idiosyncrasy; peculiar or individual.
Example
His idiosyncratic behavior set him apart from his colleagues.
C1 adverb /ɪnˈdɛfɪnətli/

indefinitely

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

immortal

Meaning
living forever; never dying; lasting forever in fame or memory
Example
Legends often describe heroes as immortal beings who never die.
C2 adjective /ˌɪnsəˈprɛsəbl/

insuppressible

Meaning
That cannot be suppressed or restrained.
Example
She had an insuppressible urge to laugh during the ceremony.
C1 adjective /ɪˈneɪn/

inane

Meaning
lacking sense, meaning, or significance; silly or pointless
Example
The movie was criticized for its inane dialogue.
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 verb /ɪmˈpɛər/

impair

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

inglorious

Meaning
Causing shame or disgrace; not bringing honor or glory.
Example
The army suffered an inglorious defeat.
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.
B2 noun /ɪnˈtɛnsəti/

intensity

Meaning
The quality of being extreme, strong, or forceful in degree.
Example
The intensity of the storm frightened the villagers.
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 /ˌɪnkɔːrˈpɔːriəl/

incorporeal

Meaning
lacking a physical body; not composed of matter; intangible
Example
Ghosts are often described as incorporeal beings.
B2 adjective /ɪsˈlɑːmɪk/

islamic

Meaning
relating to Islam, its followers, or its teachings
Example
The city has many Islamic cultural centers.
B2 verb /ˌɪntərˈviːn/

intervene

Meaning
To come between people, groups, or events, often to prevent conflict or improve a situation.
Example
The teacher had to intervene to stop the fight between the students.
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.
B2 adjective /ɪnˈædɪkwət/

inadequate

Meaning
Not sufficient or good enough.
Example
The funding was inadequate to complete the project.
B1 adjective /ɪmˈpres.ɪv/

Impressive

Meaning
striking; remarkable; having the ability to impress
Example
Her impressive performance earned her a standing ovation.
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.
B2 verb /ɪmˈpoʊzd/

imposed

Meaning
forced something to be accepted or put in place
Example
The government imposed new regulations on the industry.
C2 noun /ɪnˈsuːsiəns/

insouciance

Meaning
Casual lack of concern; indifference.
Example
She carried herself with an air of insouciance, unbothered by the challenges ahead.
B2 verb /ɪnˈdʒɛkt/

inject

Meaning
To introduce a substance, especially a drug, into the body using a needle.
Example
The nurse will inject the vaccine into the patient's arm.
B2 adjective /ɪmˈpɜːrfɪkt/

imperfect

Meaning
Not perfect; having faults or flaws.
Example
The painting was beautiful despite being imperfect.
C1 noun /ɪmˈpjʊərəti/

impurity

Meaning
the state of being unclean or contaminated; a substance that makes something impure
Example
The scientist removed every impurity from the water sample.
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.
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 adjective /ˌɪnkənˈviːniənt/

Inconvenient

Meaning
causing trouble, difficulties, or discomfort; awkward; troublesome
Example
The broken elevator made it inconvenient to reach the top floor.
C2 noun /ˌɪrɪˈdɛsəns/

iridescence

Meaning
a play of lustrous, changing colors like those of a rainbow
Example
The butterfly's wings shimmered with iridescence.
A2 adjective /ˈɪntrəstɪd/

interested

Meaning
Showing curiosity or concern about something.
Example
She is very interested in learning new languages.
C2 noun /ɪnˈtɛnʃən/

intension

Meaning
The internal content of a concept; the set of attributes implied by a word or phrase.
Example
The intension of the word 'dog' includes being a mammal and domesticated.
C1 noun /ˌɪntərˈmɪʃən/

intermission

Meaning
A pause or break, especially during a performance or event.
Example
The play had a twenty-minute intermission.
B2 adjective /ɪnˈtɛnsɪv/

intensive

Meaning
Involving a lot of effort, energy, or concentration in a short period of time.
Example
She attended an intensive English course before moving abroad.
B2 noun ɪnˈfleɪʃən

inflation

Meaning
A general increase in prices and fall in the purchasing value of money.
Example
Inflation erodes the purchasing power of consumers.
C2 adjective /ˌɪnkəmˈbʌstəbl/

incombustible

Meaning
Not capable of catching fire or burning.
Example
This material is incombustible and safe for construction.
C1 noun /ˌɪnsɪɡˈnɪfɪkəns/

insignificance

Meaning
The quality of being unimportant or trivial.
Example
He felt a sense of insignificance in the vast universe.
C2 noun /ɪnˈtɛstəsi/

intestacy

Meaning
The condition of dying without having made a valid will.
Example
His estate was divided according to the laws of intestacy.
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.
C2 noun /ˈɪndɪkənt/

indicant

Meaning
Something that indicates or points to a fact or condition.
Example
High fever is often an indicant of infection.
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.
B2 noun /ˌɪntərˈsɛkʃən/

intersection

Meaning
a point where two or more things intersect, especially a road or path
Example
The intersection of Main Street and 5th Avenue is always busy.
C2 noun /ɪmp/

imp

Meaning
a small mischievous devil or sprite; a playful troublemaker
Example
The child was acting like a little imp, hiding his toys everywhere.