involuntary
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C1 adjective /ɪnˈvɑːlənˌtɛri/

involuntary

involuntario
Meaning
done without will or conscious control
Example
He gave an involuntary shiver when he heard the loud noise.
Él dio un escalofrío involuntario cuando escuchó el ruido fuerte.
C1 noun /ˈɪntrɪkəsi/

intricacy

complejidad
Meaning
the quality of being very detailed or complicated
Example
The intricacy of the design impressed everyone.
La complejidad del diseño impresionó a todos.
A2 adjective /ɪmˈpɑːsəbl/

impossible

imposible
Meaning
not able to occur, exist, or be done
Example
It is impossible to finish this work in one day.
Es imposible terminar este trabajo en un día.
B2 adjective /ˌɪnkənˈsɪstənt/

inconsistent

inconsistente
Meaning
Not staying the same throughout; lacking harmony or regularity.
Example
His answers were inconsistent and confusing.
Sus respuestas fueron inconsistentes y confusas.
C1 noun /ɪmˈprɪzənmənt/

imprisonment

encarcelamiento
Meaning
the act of putting someone in prison; the state of being confined as punishment
Example
He faced imprisonment for violating the court order.
Se enfrentó al encarcelamiento por violar la orden judicial.
B2 noun ˌɪnɪˈkwɒlɪti

inequality

desigualdad
Meaning
Difference in size, degree, circumstances, etc.; lack of equality.
Example
The theme of inequality is prominent throughout the story.
El tema de la desigualdad es prominente a lo largo de la historia.
B1 verb /ɪnˈstɔːl/

install

instalar
Meaning
To place or fix equipment or software so it is ready for use.
Example
He installed the new software on his computer.
Él instaló el nuevo software en su computadora.
C1 noun ˌɪntədɪˈpɛndənsi

interdependency

interdependencia
Meaning
The dependence of two or more people or things on each other.
Example
The interdependency of the countries led to greater cooperation.
La interdependencia de los países llevó a una mayor cooperación.
C2 adjective /ɪnˈsɛnseɪt/

insensate

insensible
Meaning
lacking physical sensation or empathy; without feeling or sensitivity
Example
The dictator's insensate cruelty shocked the world.
La crueldad insensible del dictador sorprendió al mundo.
B1 verb /ɪnˈvɑːlv/

involve

involucrar
Meaning
to include as a necessary part, or to engage someone in an activity
Example
The project will involve several departments working together.
El proyecto involucrará varios departamentos trabajando juntos.
C1 verb /ˈaɪdəlaɪz/

idolize

idolatrar
Meaning
To admire or worship someone excessively.
Example
Fans often idolize celebrities for their talent and lifestyle.
Los fanáticos a menudo idolizan a las celebridades por su talento y estilo de vida.
C2 adjective /ɪnˈsɛnʃənt/

insentient

insensible
Meaning
Lacking perception, consciousness, or sensation.
Example
The rock is an insentient object with no awareness.
La roca es un objeto insensible sin conciencia.
C1 adjective /ɪnˈveɪsɪv/

invasive

invasivo
Meaning
Tending to spread harmfully, intruding aggressively, or encroaching beyond proper boundaries.
Example
The doctor explained that the procedure was minimally invasive.
El doctor explicó que el procedimiento era mínimamente invasivo.
B2 adverb /ɪmˈpɒlɪtli/

impolitely

de manera grosera
Meaning
in a rude or discourteous manner; without showing respect or proper manners
Example
He spoke impolitely to the waiter despite the polite service.
Habló de manera grosera con el camarero a pesar del buen servicio.
C1 adjective /ˌɪnədˈmɪsəbl̩/

inadmissible

inadmisible
Meaning
Not allowed, especially as evidence in a court of law.
Example
The judge ruled the evidence inadmissible.
El juez dictaminó que la evidencia era inadmisible.
C2 adjective ˌɪn.ɪ.fɪˈkeɪ.ʃəs

inefficacious

ineficaz
Meaning
Not producing any or the desired effect; ineffective.
Example
The treatment was inefficacious in curing the disease.
El tratamiento fue ineficaz en curar la enfermedad.
C1 adjective ˌɪdiəsɪnˈkrætɪk

idiosyncratic

peculiar e individual
Meaning
Relating to idiosyncrasy; peculiar or individual.
Example
His idiosyncratic behavior set him apart from his colleagues.
Su comportamiento idiosincrático lo diferenciaba de sus compañeros.
C1 noun /ɪnˈkɜːrʒən/

incursion

incursión
Meaning
A sudden attack or invasion into a place or territory.
Example
The army repelled the enemy incursion at the border.
El ejército repelió la incursión enemiga en la frontera.
B2 noun /ɪnˌtɜːrprəˈteɪʃən/

interpretation

interpretación
Meaning
the action of explaining the meaning of something
Example
The teacher gave her own interpretation of the poem.
La profesora dio su propia interpretación del poema.
C1 verb /ˌɪnstɪˈtjuːʃənəlaɪz/

institutionalize

institucionalizar
Meaning
to establish something as a formal institution, custom, or practice
Example
The government seeks to institutionalize environmental protection.
El gobierno busca institucionalizar la protección ambiental.
C2 adjective /ɪˈnjʊərd/

inured

acostumbrado
Meaning
Accustomed to something, especially something unpleasant.
Example
After years of hardship, she was inured to suffering.
Después de años de sufrimiento, ella estaba acostumbrada al dolor.
C1 adjective ˌɪm.pəˈsɛp.tɪ.bəl

imperceptible

imperceptible
Meaning
So subtle or gradual that it is difficult to notice or perceive
Example
The changes in his behavior were imperceptible at first.
Los cambios en su comportamiento eran imperceptibles al principio.
B2 adjective /ɪnˈtɛnsɪv/

intensive

intenso
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.
Ella asistió a un curso intensivo de inglés antes de mudarse al extranjero.
C2 noun /ˌɪnvəˈkeɪʃən/

invocation

invocación
Meaning
the act of calling upon a higher power for help, blessing, or inspiration
Example
The ceremony began with an invocation to the gods.
La ceremonia comenzó con una invocación a los dioses.
C1 verb /ɪnˈvælɪdeɪt/

invalidate

invalidar
Meaning
To make something not valid or legally acceptable.
Example
The new evidence may invalidate the previous ruling.
La nueva evidencia puede invalidar el fallo anterior.
B2 adjective /ɪnˈkeɪpəbəl/

incapable

incapaz
Meaning
lacking the ability, skill, or capacity to do something
Example
He is incapable of understanding complex instructions.
Es incapaz de entender instrucciones complejas.
C1 adjective /ɪnˈvɪnsəbl/

invincible

invencible
Meaning
too powerful to be defeated or overcome
Example
The team seemed invincible after winning ten matches in a row.
El equipo parecía invencible después de ganar diez partidos consecutivos.
C2 adjective/noun /ɪnˈkɑːrnədiːn/

incarnadine

rojo intenso
Meaning
a bright crimson or pinkish-red color
Example
The sky turned incarnadine at sunset.
El cielo se tornó rojo intenso al atardecer.
B2 noun ɪˈmjuː.nɪ.ti

immunity

inmunidad
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.
Una fuerte inmunidad protege contra infecciones.
B2 adverb /aɪˈrɒnɪkli/

ironically

irónicamente
Meaning
in a way that is contrary to what is expected or intended
Example
Ironically, the fire station burned down.
Irónicamente, la estación de bomberos se incendió.
C2 adjective /ɪmˌpɜːrˈsweɪdəbl/

impersuadable

inconvencible
Meaning
not able to be convinced or persuaded
Example
She remained impersuadable despite all our arguments.
Ella permaneció inconvencible a pesar de todos nuestros argumentos.
C2 noun /ˌɪn.ʌnˈdeɪ.ʃən/

inundation

inundación
Meaning
The act of flooding or overwhelming with water or things.
Example
The town suffered from a severe inundation after the heavy rains.
La ciudad sufrió una grave inundación después de las fuertes lluvias.
B2 adjective /ɪnˈfɔːrmətɪv/

Informative

informativo
Meaning
giving or providing useful information; educational; instructive
Example
The documentary was very informative and educational.
El documental fue muy informativo y educativo.
A2 adjective /ɪl/

Ill

enfermo; mal; en mala salud
Meaning
sick; unwell; in poor health
Example
He felt ill and decided to stay home from work.
Se sintió enfermo y decidió quedarse en casa del trabajo.
B2 noun /ɪnˈvɛstɪˌɡeɪtər/

investigator

felicidad
Meaning
a person who carries out a formal inquiry or investigation
Example
The investigator gathered evidence from the crime scene.
Ella no pudo ocultar su felicidad cuando recibió el premio.
B1 adverb /ɪnˈkrɛdɪbli/

incredibly

increíblemente
Meaning
to a great degree; extremely or unbelievably
Example
The view from the top of the mountain was incredibly beautiful.
La vista desde la cima de la montaña era increíblemente hermosa.
C2 verb /ɪnˈtɜːr/

inter

enterrar
Meaning
To bury a dead body in the ground.
Example
They decided to inter the soldier with full honors.
Ellos decidieron enterrar al soldado con todos los honores.
B1 noun ˌɪndɪˈpendəns

independence

independencia
Meaning
The fact or state of being independent; freedom from outside control; not being subject to another's authority.
Example
Independence inspired the movement.
La independencia inspiró el movimiento.
C1 noun /ɪnˈɛk.wɪ.ti/

inequity

inequidad
Meaning
Lack of fairness or justice; unequal distribution or treatment.
Example
Social inequity continues to be a global issue.
La inequidad social sigue siendo un problema global.
C2 noun /ˌɪndɛnˈteɪʃən/

indentation

sangría
Meaning
A space left at the beginning of a line of text; a notch or deep recess on a surface.
Example
The teacher asked the students to use proper indentation in their essays.
El profesor pidió a los estudiantes que usaran una sangría adecuada en sus ensayos.
C1 noun ˌɪrɪˈvɜːrsəbl ˈdæmɪdʒ

irreversible damage

daño irreversible
Meaning
Harm or injury that cannot be undone or repaired.
Example
Climate change causes irreversible damage to ecosystems.
El cambio climático causa daño irreversible a los ecosistemas.
C1 noun ˌɪnsjʊˈleɪʃən

insulation

aislamiento
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.
El aislamiento de las áreas de almacenamiento de alimentos puede evitar que entren plagas.
B2 noun ˈɪn.deks

index

índice
Meaning
An alphabetical list of names, subjects, etc. with references to the places where they occur, typically found at the end of a book; a sign or measure of something.
Example
An index organizes critical data.
Un índice organiza datos importantes.
C2 noun /ˌɪdiəˈsɪŋkrəsi/

idiosyncrasy

idiosincrasia
Meaning
A distinctive or peculiar characteristic, habit, or mannerism unique to an individual.
Example
One of her idiosyncrasies was humming while working.
Una de sus idiosincrasias era tararear mientras trabajaba.
C1 noun ɪnˈsɒl.vən.si

insolvency

insolvencia
Meaning
The state of being unable to pay debts owed; bankruptcy.
Example
The company declared insolvency after years of losses.
La empresa declaró la insolvencia después de años de pérdidas.
C1 adjective /ɪnˈɡreɪnd/

ingrained

arraigado
Meaning
Firmly fixed or established; deeply rooted and difficult to change.
Example
His ingrained habits were hard to break.
Sus hábitos arraigados eran difíciles de romper.
C2 adjective /ɪnˈkɒrɪdʒəbəl/

incorrigible

incorregible
Meaning
incapable of being corrected, improved, or reformed
Example
He is an incorrigible optimist who never loses hope.
Él es un optimista incorregible que nunca pierde la esperanza.
C1 adverb /ɪnˈvɜːrs.li/

Inversely

inversamente; en sentido opuesto
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.
El precio de los productos está inversamente relacionado con su disponibilidad en el mercado.
C2 adjective /ˌɪrɪˈdjuːsəbl/

irreducible

irreducible
Meaning
impossible to reduce or simplify further
Example
The fraction 3/7 is irreducible.
La fracción 3/7 es irreducible.
C1 adjective /ɪˈnɔːɡjərəl/

Inaugural

inaugural
Meaning
marking the beginning of something; first; opening
Example
The president delivered his inaugural speech.
El presidente dio su discurso inaugural.
B2 adjective /ˌɪn.trəˈdʌk.tər.i/

introductory

introductorio
Meaning
Serving as an introduction; preliminary or preparatory.
Example
The professor gave an introductory lecture on economics.
El profesor dio una conferencia introductoria sobre economía.
C1 adjective /ɪnˈflæməbəl/

Inflammable

inflamable; combustible
Meaning
easily set on fire; flammable; combustible
Example
The inflammable material caught fire quickly.
El material inflamable se prendió rápidamente.
C1 noun ˌɪm.pʌlˈsɪv.ɪ.ti

impulsivity

impulsividad
Meaning
The tendency to act quickly and without thought or care; lack of self-control.
Example
His impulsivity led him to make reckless choices.
Su impulsividad lo llevó a tomar decisiones imprudentes.
C1 adjective /ɪnˈdiːsənt/

indecent

indecente
Meaning
not conforming to accepted standards of behavior or morality; improper or offensive
Example
He was warned for making an indecent remark during the meeting.
Fue advertido por hacer un comentario indecente.
C2 noun /ˌɪnəməˈrɑːtə/

inamorata

amante
Meaning
A woman with whom someone is in love; a female lover.
Example
He wrote a poem dedicated to his inamorata.
Escribió un poema dedicado a su enamorada.
C1 adjective /ˈɪndɪɡoʊ bluː/

Indigo-blue

azul índigo
Meaning
a deep blue color with a purplish tinge
Example
The indigo-blue sky looked magnificent at twilight.
El cielo azul índigo se veía magnífico al atardecer.
C2 noun /aɪər/

ire

ira, enojo
Meaning
intense anger or rage
Example
The new policy provoked the ire of the employees.
La nueva política provocó la ira de los empleados.
C2 adjective /ɪmˈplækəbl/

implacable

implacable
Meaning
unable to be appeased, calmed, or pacified
Example
The soldiers faced an implacable enemy who refused to surrender.
Los soldados se enfrentaron a un enemigo implacable que se negó a rendirse.
C1 adjective, noun /ˈɪnvəlɪd/ (adjective), /ɪnˈvælɪd/ (noun)

invalid

inválido
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.
El tribunal declaró el contrato inválido.
C2 adjective /ˈɪmənənt/

immanent

inmanente
Meaning
existing or operating within; inherent
Example
He believed that moral values are immanent in human nature.
Él creía que los valores morales son inmanentes en la naturaleza humana.
C1 adjective /ɪˈrɛpərəbəl/

Irreparable

irreparable
Meaning
impossible to repair or fix; permanent damage that cannot be undone
Example
The accident caused irreparable damage to his spine.
El accidente causó daños irreparables en su columna vertebral.
B2 verb ɪmˈpoʊz

imposes

imponer
Meaning
To establish or apply by authority; to force something unwelcome or unfamiliar to be accepted or put in place.
Example
Pollution imposes harmful effects on the environment.
La contaminación impone efectos perjudiciales en el medio ambiente.
C2 verb /ɪnˈdɒktrɪˌneɪt/

indoctrinate

adoctrinar
Meaning
To teach someone to fully accept a set of beliefs or ideas without question.
Example
The regime tried to indoctrinate the youth with propaganda.
El régimen trató de adoctrinar a la juventud con propaganda.
C1 noun /ˈɪnkwest/

inquest

investigación
Meaning
A legal or official inquiry, especially into the cause of a death.
Example
The inquest revealed the cause of the accident.
La investigación reveló la causa del accidente.
C2 verb /ɪnˈɡreɪʃiˌeɪt/

ingratiate

ganarse el favor de
Meaning
To gain favor or approval by deliberate effort, often in a flattering way.
Example
She tried to ingratiate herself with her boss by complimenting him often.
Ella intentó ingraciarse con su jefe al elogiarlo con frecuencia.
C1 adverb ɪnˈtrɪn.zɪ.kli

intrinsically

intrínsecamente
Meaning
In a way that is naturally or inherently part of something's essential nature.
Example
Some people are intrinsically motivated to learn.
Algunas personas están intrínsecamente motivadas para aprender.
C2 noun /ɪnˈhɪərəns/

inherence

inherencia
Meaning
The state of being an essential or permanent part of something.
Example
The inherence of risk is part of every business venture.
La inherencia del riesgo es parte de cada aventura empresarial.
B2 verb ˈɪmplɪment

implement

implementar
Meaning
To put a decision or plan into effect; to execute or apply.
Example
Implementing educational policies is essential for progress.
Es esencial implementar políticas educativas para el progreso.
C1 adjective /ˌɪnsərˈmaʊntəbl/

insurmountable

insuperable
Meaning
Too great to be overcome.
Example
The explorers faced insurmountable odds in the desert.
Los exploradores enfrentaron obstáculos insuperables en el desierto.
C1 verb /ɪmˈpɛl/

impel

impulsar
Meaning
to drive, force, or urge someone to do something
Example
Her curiosity impelled her to open the mysterious box.
Su curiosidad la impulsó a abrir la caja misteriosa.
C1 noun /ˈɪd.i.əm/

idiom

modismo
Meaning
A group of words whose meaning is different from the meanings of the individual words.
Example
The idiom 'break the ice' means to start a conversation in a friendly way.
El modismo 'romper el hielo' significa comenzar una conversación de manera amistosa.
C2 adjective /ˌɪntərˈniːsaɪn/

internecine

conflicto interno
Meaning
Relating to conflict within a group, often causing mutual destruction.
Example
The internecine conflict weakened the organization from within.
El conflicto interno debilitó la organización desde dentro
B2 noun ˌɪn.əˈveɪ.ʃən

innovation

innovación
Meaning
The action or process of innovating; a new method, idea, product, etc.
Example
Innovation drives solutions to global challenges.
La innovación impulsa soluciones a los desafíos globales.
C2 adjective /ˌaɪdəˈlɑːtrɪəs/

idolatrious

idolátrico
Meaning
Excessively devoted or reverent towards idols or false gods.
Example
The ancient tribe was known for its idolatrious practices.
La antigua tribu era conocida por sus prácticas idolátricas.
C1 adjective /ˌɪməˈtɪəriəl/

immaterial

inmaterial
Meaning
Not important or relevant; lacking physical substance.
Example
The judge ruled that the argument was immaterial to the case.
El juez falló que el argumento no era relevante para el caso.
C1 adjective /ɪnˈkwɪzɪtɪv/

inquisitive

inquisitivo
Meaning
Curious or eager to learn and ask questions.
Example
The inquisitive child asked endless questions about the stars.
El niño inquisitivo hizo preguntas interminables sobre las estrellas.
C1 noun /ˌɪndɪɡˈneɪʃən/

indignation

indignación
Meaning
Strong displeasure or anger caused by something unjust, offensive, or insulting.
Example
Public indignation grew after the unfair verdict.
La indignación pública creció después del veredicto injusto.
C1 adjective /ɪˈmoʊbəl/

immobile

inmóvil
Meaning
unable to move or be moved
Example
After the accident, he was immobile for weeks.
Después del accidente, estuvo inmóvil durante semanas.
C2 adjective /ɪnˈklɛmɛnt/

inclement

clima inclemente
Meaning
unpleasantly cold, wet, or stormy (usually weather)
Example
The match was canceled due to inclement weather.
El partido fue cancelado debido al clima inclemente.
B2 adjective /ɪmˈpɜːrfɪkt/

imperfect

imperfecto
Meaning
Not perfect; having faults or flaws.
Example
The painting was beautiful despite being imperfect.
La pintura era hermosa a pesar de ser imperfecta.
C1 noun /ˈɪnsɪdəns/

incidence

incidencia
Meaning
the occurrence, rate, or frequency of something
Example
The incidence of road accidents has decreased this year.
La incidencia de accidentes de tráfico ha disminuido este año.
C1 adjective /ˈɪɡ.ni.əs/

igneous

ígnea
Meaning
Formed through the cooling and solidification of magma or lava.
Example
Granite is an igneous rock commonly used in construction.
El granito es una roca ígnea que se utiliza comúnmente en la construcción.
C1 verb /ˈɪmprəvaɪz/

improvise

improvisar
Meaning
To create or perform something spontaneously without preparation.
Example
The actor had to improvise his lines when he forgot the script.
El actor tuvo que improvisar sus líneas cuando olvidó el guion.
C2 noun /ˌɪnkənˈɡruːəti/

incongruity

incongruencia
Meaning
The state of being inconsistent or out of place.
Example
The incongruity of his cheerful mood during the funeral shocked everyone.
La incongruencia de su estado de ánimo alegre durante el funeral sorprendió a todos.
C2 verb /ɜːrk/

irk

molestar
Meaning
to annoy or irritate someone
Example
It irks me when people are late without calling.
Me molesta cuando la gente llega tarde sin llamar.
C1 adjective /ɪˈmjuː.tə.bəl/

immutable

inmutable
Meaning
Unchangeable, permanent, or fixed
Example
The laws of physics are considered immutable.
Las leyes de la física son consideradas inmutables.
C2 adjective /ˌɪnɪkˈsprɛsəbl/

inexpressible

inexpresable
Meaning
Too strong or extreme to be expressed in words.
Example
She felt inexpressible joy at the news of her success.
Sintió una alegría inexpresable al enterarse de su éxito.
A2 noun/adjective /ˌɪndɪˈvɪdʒuəl/

individual

individuo
Meaning
A single human being as distinct from a group; relating to one person.
Example
Each individual has the right to freedom of speech.
Cada individuo tiene el derecho a la libertad de expresión.
C1 adjective /ɪnˈtrɛpɪd/

intrepid

intrépido
Meaning
fearless and adventurous, often used humorously
Example
The intrepid traveler explored the jungle alone.
El intrépido viajero exploró la jungla solo.
C2 noun /ˌɪmpəˈtjuːəsəti/

impetuosity

impetuosidad
Meaning
The quality of being rash or impulsive.
Example
His impetuosity often got him into trouble.
Su impetuosidad a menudo lo metía en problemas.
C1 verb /ɪnˈterəˌɡeɪt/

interrogate

interrogar
Meaning
to ask someone questions in a thorough and formal way; to question intensively
Example
The police interrogated the suspect for hours.
La policía interrogó al sospechoso durante horas.
C2 adjective /ˌɪrɛvəˈrɛnʃəl/

irreverential

irreverente
Meaning
Showing a lack of respect for things that are generally taken seriously.
Example
His irreverential humor often shocked traditional audiences.
Su humor irreverente a menudo sorprendía a las audiencias tradicionales.
B2 noun ˌɪntəˈlektʃuəlz

intellectuals

intelectuales
Meaning
People possessing a highly developed intellect; scholars or academics.
Example
Intellectuals protested against the dominance.
Los intelectuales protestaron contra la dominación.
B2 adverb /ɪmˈpeɪʃəntli/

impatiently

impacientemente
Meaning
in a manner showing annoyance or restlessness due to delay or waiting
Example
She tapped her fingers impatiently while waiting for the reply.
Ella tamborileó los dedos impacientemente mientras esperaba la respuesta.
C1 adjective ɪnˈdʒiː.ni.əs

ingenious

ingenioso
Meaning
Showing inventiveness and skill; clever, original, and inventive.
Example
His ingenious ideas transformed modern physics.
Sus ideas ingeniosas transformaron la física moderna.
C2 verb /ˌɪntərˈmɪt/

intermit

interrumpir
Meaning
To suspend or stop for a time; to pause intermittently.
Example
The rain would intermit and then start again.
La lluvia se interrumpiría y luego comenzaría de nuevo.
C1 adverb /ˈɪnwərdli/

inwardly

por dentro
Meaning
In the mind or spirit; not outwardly visible.
Example
She smiled outwardly but inwardly she was worried.
Ella sonrió por fuera, pero por dentro estaba preocupada.
C2 adjective /ɪnˈtɛsteɪt/

intestate

muerto sin testamento
Meaning
Having died without leaving a valid will.
Example
She died intestate, so her assets were distributed by law.
Ella murió sin testamento, por lo que sus bienes fueron distribuidos por la ley.
C1 adjective /ˌɪn.səbˈstæn.ʃəl/

insubstantial

insustancial
Meaning
Lacking strength, substance, or solidity.
Example
The evidence provided was insubstantial and unconvincing.
La evidencia proporcionada fue insustancial y poco convincente.
C1 adjective /ɪnˈɛlɪdʒəbəl/

Ineligible

inelegible; no apto; no cualificado
Meaning
not qualified or entitled to participate or be chosen; unsuitable
Example
Students with poor grades are ineligible for the scholarship program.
Los estudiantes con calificaciones bajas no son elegibles para el programa de becas.
C1 adjective /ɪnˈvɜːs/

Inverse

inverso; opuesto
Meaning
opposite in order, nature, or effect; reversed
Example
There is an inverse relationship between price and demand.
Existe una relación inversa entre el precio y la demanda.
C1 verb /ɪnˈdʌkt/

induct

admitir formalmente a alguien en una posición, organización o cargo
Meaning
to formally admit someone into a position, organization, or office
Example
She was inducted into the university's honor society.
Ella fue admitida en la sociedad de honor de la universidad.
C1 verb /ɪmˈpiːd/

impede

impedir
Meaning
To obstruct or hinder the progress or development of something.
Example
Lack of funds can impede business growth.
La falta de fondos puede impedir el crecimiento empresarial.
C1 adjective /ɪmˈpjʊər/

Impure

impuro
Meaning
contaminated; not clean; mixed with foreign substances
Example
The impure water caused health problems in the village.
El agua impura causó problemas de salud en el pueblo.
C2 verb /ɪnˈveɪ/

inveigh

criticar duramente
Meaning
To speak or write about something with great hostility and criticism.
Example
He inveighed against the corruption in government.
Él criticó duramente la corrupción en el gobierno.
C1 noun /ɪnˈtɛstɪn/

intestine

intestino
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.
El doctor explicó cómo los nutrientes se absorben en el intestino delgado.
C1 noun /ˌɪnækˈtɪvɪti/

inactivity

inactividad
Meaning
the state of not being active physically or mentally; lack of action
Example
Prolonged inactivity can negatively affect both physical and mental health.
La inactividad prolongada puede afectar negativamente la salud física y mental.
B2 noun /ɪnˈspekʃən/

inspection

inspección
Meaning
a careful examination of something, especially to check that it is correct or safe
Example
The building passed the safety inspection last week.
El edificio pasó la inspección de seguridad la semana pasada.
C2 adjective /ˌɪnkɒntrəˈvɜːtəbl/

incontrovertible

incontrovertible
Meaning
impossible to deny or dispute; unquestionable
Example
The evidence was incontrovertible and proved his innocence.
La evidencia era incontrovertible y demostró su inocencia.
B2 adjective + noun aɪˈdiːəl ɪnˈvaɪrənmənt

ideal environment

entorno ideal
Meaning
Perfect or most suitable conditions for growth or development
Example
Winter creates an ideal environment for vegetable growth.
El invierno crea un ambiente ideal para el crecimiento de las verduras.
C1 adjective /ˌɪndɪˈstrʌktəbl/

indestructible

indestructible
Meaning
Impossible to destroy or break.
Example
The superhero's shield was said to be indestructible.
Se dijo que el escudo del superhéroe era indestructible.
C2 adjective /ˌɪnˌɑːpərˈtuːn/

inopportune

momento inoportuno
Meaning
Happening at a bad or inconvenient time.
Example
His call came at the most inopportune moment.
Su llamada llegó en el momento más inoportuno.
C2 noun /ɪnˈvɛstɪtʃər/

investiture

ceremonia de investidura
Meaning
the formal ceremony of conferring authority, rank, or office
Example
The king held an investiture ceremony for the new knight.
El rey celebró una ceremonia de investidura para el nuevo caballero.
C2 adjective /ɪnhɑːrˈmoʊniəs/

Inharmonious

desarmónico
Meaning
lacking harmony; discordant in sound; not in tune
Example
The inharmonious sounds from the broken piano made everyone cover their ears.
Los sonidos desarmónicos del piano roto hicieron que todos se cubrieran los oídos.
C1 adjective /ɪˈlʌstriəs/

illustrious

ilustre
Meaning
Well known, respected, and admired for past achievements.
Example
She had an illustrious career in medicine.
Tuvo una carrera ilustre en la medicina.
B2 adjective /ˌɪnkənˈviːniənt/

Inconvenient

inconveniente; molesto; problemático
Meaning
causing trouble, difficulties, or discomfort; awkward; troublesome
Example
The broken elevator made it inconvenient to reach the top floor.
El ascensor roto hizo que fuera inconveniente llegar al último piso.
B2 noun /ɪmˈpɒlɪtnəs/

impoliteness

descortesía
Meaning
lack of good manners or courtesy; rude behavior
Example
His impoliteness towards the guests shocked everyone.
Su descortesía hacia los invitados sorprendió a todos.
C2 verb /ɪnˈsteɪt/

instate

instaurar
Meaning
To set up in position, office, or authority.
Example
The board decided to instate her as the new director.
La junta decidió instatarla como la nueva directora.
C2 verb /ˌɪmpɔːrˈtuːn/

importune

pedir insistentemente
Meaning
To ask someone persistently or pressingly for something
Example
The child importuned his mother for a new toy.
El niño importunó a su madre para que le comprara un juguete nuevo.
C2 noun /ɪnˈsuːsiəns/

insouciance

despreocupación
Meaning
Casual lack of concern; indifference.
Example
She carried herself with an air of insouciance, unbothered by the challenges ahead.
Ella caminaba con un aire de despreocupación, sin preocuparse por los desafíos que venían.
B2 verb /ɪˈnɪʃieɪt/

initiate

iniciar
Meaning
to begin or start; to introduce someone to a new activity
Example
The company will initiate a new training program.
La empresa iniciará un nuevo programa de capacitación.