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B2 adjective aɪˈkɒnɪk

iconic

icónico
Meaning
Very famous or popular, especially being considered to represent particular opinions or a particular time.
Example
The line "It was the best of times..." is iconic.
La línea "Fue el mejor de los tiempos..." es icónica.
C2 noun /ˌɪkθiˈɒlədʒi/

ichthyology

icthología
Meaning
The branch of zoology that deals with fish.
Example
He pursued a degree in ichthyology at the university.
Obtuvo un título en ictiología en la universidad.
A2 adverb /ˌɪnˈdɔːrz/

indoors

en el interior
Meaning
inside a building; within an enclosed space
Example
Because of the rain, everyone stayed indoors.
Debido a la lluvia, todos se quedaron en el interior.
C2 verb /ɪnˈdʒɛst/

ingest

ingerir
Meaning
To take food, drink, or another substance into the body, usually by swallowing.
Example
The patient must ingest the medicine with water.
El paciente debe ingerir el medicamento con agua.
C1 adjective /ɪmˈpoʊzɪŋ/

imposing

imponente
Meaning
having an appearance that is grand, impressive, or commanding
Example
The castle is an imposing structure overlooking the valley.
El castillo es una estructura imponente que domina el valle.
B2 adjective /ˌɪntərˈmiːdiət/

intermediate

intermedio
Meaning
Coming between two things in time, place, or order; in the middle level or stage.
Example
She is taking an intermediate-level French course.
Ella está tomando un curso de francés de nivel intermedio.
B1 adjective /ˌɪmpəˈlaɪt/

impolite

grosero
Meaning
Not showing good manners; rude.
Example
It is impolite to interrupt someone while they are speaking.
Es grosero interrumpir a alguien mientras está hablando.
B2 verb /ˈɪr.ɪ.teɪt/

irritate

irritar
Meaning
To make someone annoyed or angry; to cause discomfort or inflammation.
Example
Rubbing your eyes can irritate them.
Frotarse los ojos puede irritarlos.
C1 adjective ˌɪn.tə.dʒen.əˈreɪ.ʃən.əl

intergenerational

intergeneracional, entre diferentes generaciones de una familia
Meaning
Existing or occurring between different generations of a family.
Example
Intergenerational wisdom ensures cultural continuity.
La sabiduría intergeneracional asegura la continuidad cultural.
C2 adjective /ɪˈmɒdɪst/

immodest

presuntuoso / indecente
Meaning
lacking humility or decency; excessively proud or improper
Example
His immodest remarks offended the audience.
Sus comentarios presuntuosos ofendieron a la audiencia.
C1 verb /ˈɪmplɪˌkeɪt/

implicate

implicar
Meaning
To show someone’s involvement in a crime or wrongdoing.
Example
The evidence implicated several officials in the scandal.
La evidencia implicó a varios funcionarios en el escándalo.
B2 adjective /ˈaɪsi/

Icy

helado; extremadamente frío; hostil
Meaning
extremely cold; covered with ice; unfriendly or hostile
Example
The icy wind made everyone shiver.
El viento helado hizo que todos temblaran.
C1 noun /ˈɪŋ.krə.mənt/

Increment

aumento
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.
Recibió un aumento anual del cinco por ciento en su salario este año.
B2 verb ˈɪmplɪmentɪd

implemented

implementado
Meaning
Put a decision or plan into effect; carried out or executed.
Example
The master plans were partially implemented.
Los planes maestros fueron implementados parcialmente.
B2 adjective /ɪˈmædʒ.ɪ.nər.i/

Imaginary

imaginario; ficticio; no real
Meaning
existing only in imagination; not real; fictional
Example
The child had an imaginary friend who she talked to every day.
La niña tenía un amigo imaginario con el que hablaba todos los días.
A1 preposition /ˈɪntuː/

into

adentro
Meaning
expressing movement or direction to the inside of something
Example
She walked into the room quietly.
Ella entró silenciosamente en la habitación.
B2 adjective /ˌɪnkəmˈpliːt/

incomplete

incompleto
Meaning
Not finished, lacking some parts or not whole.
Example
Her report was incomplete and needed further details.
Su informe estaba incompleto y necesitaba más detalles.
C1 adjective ɪˈluː.sər.i

illusory

ilusorio
Meaning
Based on illusion; not real although seeming to be.
Example
His sense of security was entirely illusory.
Su sensación de seguridad era completamente ilusoria.
C2 noun /ɪmˈprɑːvɪdəns/

improvidence

imprudencia
Meaning
Lack of foresight or care for future needs.
Example
His improvidence led to financial difficulties.
Su imprudencia lo llevó a dificultades financieras.
C2 noun /ɪˈrɛvərəns/

irreverence

irreverencia
Meaning
a lack of respect for people or things that are generally taken seriously
Example
His jokes about religion showed irreverence to the sacred traditions.
Sus bromas sobre religión mostraron irreverencia hacia las tradiciones sagradas.
B2 verb /ˈɪnəveɪt/

innovate

innovar
Meaning
To introduce new methods, ideas, or products.
Example
The company must innovate to stay ahead of its competitors.
La empresa debe innovar para mantenerse por delante de sus competidores.
C2 adjective /ˌɪmpɪˈkjuːniəs/

impecunious

pobre
Meaning
Having little or no money; poor.
Example
He grew up in an impecunious family.
Creció en una familia pobre.
B2 noun ɪnˈsɛntɪvz

incentives

incentivos
Meaning
Things that motivate or encourage one to do something.
Example
Tax incentives are used to encourage investment in renewable energy.
Se utilizan incentivos fiscales para fomentar la inversión en energía renovable.
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.
C1 adjective /ɪnˈsɪdiəs/

insidious

insidioso
Meaning
Proceeding in a gradual, subtle way but with harmful effects.
Example
The insidious spread of misinformation can damage trust.
La propagación insidiosa de la desinformación puede dañar la confianza.
C2 noun /ˌɪnvəˈlɪdɪti/

invalidity

invalidez
Meaning
the state of being invalid, legally void, or lacking force or validity
Example
The court ruled that the contract suffered from invalidity.
El tribunal dictaminó que el contrato tenía invalidez.
C1 adjective /ɪˈlɪsɪt/

illicit

ilícito
Meaning
Forbidden by law, rules, or custom.
Example
The police shut down the illicit drug operation.
La policía cerró la operación de drogas ilícitas.
C2 verb /ˈɪndjʊˌreɪt/

indurate

endurecer
Meaning
To harden or make something physically or emotionally tough.
Example
Years of hardship indurated his spirit.
Años de dificultades induraron su espíritu.
A2 verb /ɪnˈkri:s/

increase

aumentar
Meaning
to become or make something larger in amount, number, or degree
Example
The company plans to increase its production this year.
La empresa planea aumentar su producción este año.
C1 noun /ˌɪnklɪˈneɪʃən/

inclination

inclinación
Meaning
A natural tendency or urge to act or feel in a particular way.
Example
She has an inclination towards helping others.
Ella tiene una inclinación hacia ayudar a los demás.
B1 noun /ˈɪnstəns/

instance

instancia
Meaning
An example or single occurrence of something.
Example
This is just one instance of his generosity.
Este es solo un ejemplo de su generosidad.
B2 adjective/noun /ɪˈrɑːki/

iraqi

iraquí
Meaning
relating to Iraq or its people
Example
The Iraqi culture is rich and diverse.
La cultura iraquí es rica y diversa.
C2 noun /ˈɪn.dɪ.dʒəns/

indigence

indigencia
Meaning
a state of extreme poverty or destitution
Example
The charity was founded to help people living in indigence.
La caridad se fundó para ayudar a las personas que viven en indigencia.
C1 adjective /ˌɪnækˈsɛsəbl/

inaccessible

inaccesible
Meaning
unable to be reached, entered, or understood
Example
The remote village is almost inaccessible during the rainy season.
El pueblo remoto es casi inaccesible durante la temporada de lluvias.
B2 noun /ɪˈluː.ʒən/

Illusion

ilusión
Meaning
a thing that is or is likely to be wrongly perceived or interpreted; a false idea or belief
Example
The magician created a spectacular illusion that made the elephant appear to vanish.
El mago creó una espectacular ilusión que hizo que el elefante pareciera desvanecerse.
C1 adjective /ɪnˈdɪɡnənt/

indignant

indignado
Meaning
Feeling or showing anger at something considered unfair or unjust.
Example
She was indignant when accused of cheating.
Ella estaba indignada cuando la acusaron de hacer trampa.
B2 verb /ɪnˈstrʌkt/

instruct

instruir
Meaning
to teach; to give directions
Example
The teacher instructed the students carefully.
El maestro instruyó a los estudiantes con cuidado.
C2 noun /ˈaɪ.kɒn/

ikon

imagen religiosa o símbolo
Meaning
A religious image or symbol, especially in the Eastern Orthodox Church.
Example
The church displayed a beautifully painted ikon of the Virgin Mary.
La iglesia mostró un ícono bellamente pintado de la Virgen María.
C2 adjective /ɪnˈeɪliənəbl/

inalienable

inalienable
Meaning
Unable to be taken away or transferred; absolute and permanent.
Example
Freedom of speech is an inalienable right.
La libertad de expresión es un derecho inalienable.
C1 noun /ˌɪnfɪˈdɛləti/

infidelity

infidelidad
Meaning
the act of being unfaithful to a spouse or partner
Example
Their marriage ended due to his infidelity.
Su matrimonio terminó debido a su infidelidad.
B2 adjective /ɪˈmjuːn/

immune

inmunizado
Meaning
protected from disease or from the effects of something
Example
Children who are vaccinated are immune to many diseases.
Los niños vacunados están inmunizados contra muchas enfermedades.
B2 adjective /ɪmˈper.ə.tɪv/

imperative

imperativo
Meaning
Of vital importance; crucial; giving or expressing a command.
Example
It is imperative to address the climate crisis immediately.
Es imperativo abordar la crisis climática de inmediato.
C1 noun /ˈɪn.fən.tri/

Infantry

infantería
Meaning
soldiers marching or fighting on foot; foot soldiers collectively
Example
The infantry advanced across the battlefield on foot.
La infantería avanzó a través del campo de batalla a pie.
C2 noun /ɪnˈdɛntʃər/

indenture

contrato de servidumbre
Meaning
A formal legal agreement, contract, or document, often relating to work or service.
Example
In the 18th century, many workers came under indenture to work overseas.
En el siglo XVIII, muchos trabajadores estuvieron bajo un contrato de servidumbre para trabajar en el extranjero.
C1 noun /ˌɪnkənˈsɪstənsi/

inconsistency

inconsistencia
Meaning
The quality of being contradictory, irregular, or not staying the same.
Example
There is an inconsistency between his words and actions.
Hay una inconsistencia entre sus palabras y acciones.
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 /ˌɪnkɔːrˈpɔːriəl/

incorporeal

incorpóreo
Meaning
lacking a physical body; not composed of matter; intangible
Example
Ghosts are often described as incorporeal beings.
Los fantasmas a menudo se describen como seres incorpóreos.
C2 adjective /ˌɪrɪˈdɛsənt/

iridescent

iridiscente
Meaning
showing luminous colors that seem to change when seen from different angles
Example
She wore an iridescent dress that sparkled in the light.
Ella llevaba un vestido iridiscente que brillaba a la luz.
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.
B2 noun /ˈɪnˌsaɪt/

insight

perspectiva
Meaning
The ability to understand the true nature of something; deep understanding.
Example
Her insight into human behavior made her a successful psychologist.
Su perspectiva sobre el comportamiento humano la convirtió en una psicóloga exitosa.
B2 verb aɪˈdɛntɪfaɪd

identified

identificado
Meaning
To recognize or establish who or what someone or something is.
Example
The root causes of the issue need to be identified.
Las causas raíz del problema deben ser identificadas.
B2 verb /ˌɪntərˈfɪər/

interfere

felicidad
Meaning
to become involved in something that is not your concern; to hinder or obstruct
Example
Parents should not interfere in their children’s personal choices.
No pudo ocultar su felicidad cuando recibió el premio.
C1 verb /ɪnˈstɪl/

instill

instruir
Meaning
to gradually but firmly establish an idea, attitude, or habit in someone's mind
Example
Parents try to instill good values in their children.
Los padres intentan inculcar buenos valores en sus hijos.
C1 adjective /ɪmˈpæsəbəl/

impassable

intransitable
Meaning
Impossible to travel along or over.
Example
The road became impassable after the heavy snowfall.
La carretera se volvió intransitable después de la fuerte nevada.
C2 verb /ɪmˈpjuːn/

impugn

disputar la verdad, validez o honestidad de una declaración o motivo
Meaning
to dispute the truth, validity, or honesty of a statement or motive
Example
The lawyer tried to impugn the credibility of the witness.
El abogado intentó impugnar la credibilidad del testigo.
B2 verb /ɪnˈheɪl/

inhale

inhalar
Meaning
to breathe in; to draw air into the lungs
Example
Take a deep breath and inhale slowly.
Toma una respiración profunda e inhala lentamente.
A2 noun /ˈaɪ.lənd/

Island

isla
Meaning
a piece of land completely surrounded by water
Example
We visited a beautiful island during our vacation.
Visitamos una hermosa isla durante nuestras vacaciones.
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 adjective, noun /ɪzˈreɪli/

israeli

israelí
Meaning
relating to Israel or its people; a person from Israel
Example
She works for an Israeli company.
Ella trabaja para una empresa israelí.
C1 noun /ˈɪnflʌks/

influx

afluencia
Meaning
A large arrival or flow of people or things.
Example
The city experienced an influx of tourists during the festival.
La ciudad experimentó una afluencia de turistas durante el festival.
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.
B2 verb /ɪnˈʃʊər/

insure

asegurar
Meaning
to provide insurance; to make certain
Example
I need to insure my new car.
Necesito asegurar mi coche nuevo.
B2 adjective /ˈɪɡ.nər.ənt/

Ignorant

ignorante
Meaning
lacking knowledge or awareness; uninformed
Example
She was ignorant about the new technology trends.
Ella era ignorante sobre las nuevas tendencias tecnológicas.
B2 adjective /ɪnˈklaɪnd/

inclined

inclinada
Meaning
having a tendency or disposition toward something
Example
He is inclined to help those in need.
Él está inclinado a ayudar a los necesitados.
C1 adjective ɪnˈdel.ə.bəl

indelible

indeleble
Meaning
Making marks that cannot be removed; impossible to forget or remove.
Example
Her speech left an indelible mark on the audience.
Su discurso dejó una marca indeleble en la audiencia.
B2 adjective /ɪmˈplɪsɪt/

implicit

implícito
Meaning
Suggested or understood without being directly stated.
Example
Her trust in him was implicit.
Su confianza en él era implícita.
C1 adjective /ɪnˈtɜːrmənəbl/

interminable

interminable
Meaning
Seemingly endless; having no apparent end.
Example
The meeting felt interminable and exhausting.
La reunión parecía interminable y agotadora.
B2 noun /ɪnˈkwaɪəri/ or /ˈɪnkwəri/

inquiry

investigación / consulta
Meaning
An act of asking for information; an investigation into something.
Example
The committee launched an inquiry into the financial irregularities.
El comité inició una investigación sobre las irregularidades financieras.
C2 verb /ɪnˈdɛmnɪfaɪ/

indemnify

indemnizar
Meaning
to compensate someone for harm or loss; to secure against future damage or cost
Example
The insurance company agreed to indemnify the client for the damages.
La compañía de seguros acordó indemnizar al cliente por los daños.
C1 verb /ɪnˈfɛst/

infest

infestar
Meaning
to overrun in large numbers, especially so as to cause damage or discomfort
Example
The old house was infested with rats.
La vieja casa estaba infestada de ratas.
C1 noun /ˌɪmɔːrˈtæləti/

immortality

inmortalidad
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.
Muchas culturas antiguas creían que los héroes podían alcanzar la inmortalidad mediante grandes hazañas.
B2 verb /ɪnˈkwaɪər/

inquire

preguntar
Meaning
to ask; to investigate
Example
She inquired about the job opening.
Ella preguntó sobre la oferta de trabajo.
C1 adjective /ɪnˈsɪstənt/

insistent

insistente
Meaning
demanding something firmly and refusing to accept no
Example
The child was insistent on getting a new toy.
El niño era insistente en conseguir un nuevo juguete.
C2 verb /ˌɪmpɔːrˈtuːnd/

importuned

insistir persistentemente
Meaning
asked someone persistently and pressingly for something
Example
She importuned her boss for a raise until he finally gave in.
Ella insistió persistentemente a su jefe por un aumento hasta que finalmente accedió.
C1 noun /ɪnˈædɪkwəsi/

inadequacy

insuficiencia
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.
Luchaba con sentimientos de insuficiencia en el trabajo a pesar de sus sólidas calificaciones.
C1 noun /ɪmˈpɜː.mə.nəns/

impermanence

impermanencia
Meaning
The state or fact of lasting for only a limited period of time.
Example
The philosophy of Buddhism emphasizes the impermanence of life.
La filosofía del budismo enfatiza la impermanencia de la vida.
C1 noun /ˌɪn.dʒəˈnjuː.ɪ.ti/

ingenuity

ingenio
Meaning
The quality of being clever, original, and inventive.
Example
His ingenuity led to groundbreaking innovations.
Su ingenio llevó a innovaciones pioneras.
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.
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.
C2 noun /ɪkˈsɔːr.ə/

Ixora

ixora
Meaning
a tropical flowering shrub with clusters of small bright red, orange, or yellow flowers
Example
The bright red ixora bushes lined the pathway to the tropical garden.
Los arbustos de ixora de color rojo brillante alineaban el camino hacia el jardín tropical.
B2 noun ɪˈlɪtərəsi

illiteracy

analfabetismo
Meaning
The inability to read and write; lack of education or knowledge in a particular area.
Example
Illiteracy often leads to poverty and unemployment.
El analfabetismo a menudo conduce a la pobreza y el desempleo.
C1 adjective /ɪnˈvɛntɪv/

inventive

inventivo
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.
El inventor era conocido por sus soluciones inventivas para los problemas cotidianos.
C2 noun /ˌɪn.trəˈɡreʃ.ən/

introgression

introducción genética
Meaning
The transfer of genetic information from one species to another through repeated backcrossing.
Example
Introgression plays a significant role in plant breeding.
La introgressión juega un papel importante en la mejora de plantas.
C1 noun /ˌɪntərˈmɪʃən/

intermission

intermedio
Meaning
A pause or break, especially during a performance or event.
Example
The play had a twenty-minute intermission.
La obra tuvo un intermedio de veinte minutos.
B1 verb /ɪmˈpɔːrt/

import

importar
Meaning
to bring goods or services into a country from abroad; to transfer data
Example
The country imports oil from abroad.
El país importa petróleo del extranjero.
B2 noun /ɪnˈtɒlərəns/

intolerance

intolerancia
Meaning
unwillingness to accept or endure beliefs, behaviors, or conditions different from one's own
Example
The leader was criticized for his intolerance toward other religions.
El líder fue criticado por su intolerancia hacia otras religiones.
C2 adjective /ˌɪnɪkˈstrɪkəbl/

inextricable

inextricable
Meaning
Impossible to separate or escape from.
Example
The two friends shared an inextricable bond.
Los dos amigos compartieron un vínculo inextricable.
B2 verb ɪnˈvɛst.ɪŋ

investing

invertir
Meaning
The act of putting money into financial schemes, shares, property, or a commercial venture with the expectation of achieving a profit.
Example
Investing in stocks can generate long-term wealth.
Invertir en acciones puede generar riqueza a largo plazo.
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 /ˌɪlˈneɪ.tʃəd/

ill-natured

de mal carácter
Meaning
Having a bad or unpleasant character; unkind or malicious.
Example
He made an ill-natured remark about his colleague.
Hizo un comentario de mal carácter sobre su colega.
C2 adjective /ɪˈnɪmɪkəl/

inimical

hostil / adverso
Meaning
tending to obstruct or harm; unfriendly or hostile
Example
The policy was inimical to the country's economic growth.
La política era hostil al crecimiento económico del país.
B2 adjective /ɪnˈdɪf.ər.ənt/

indifferent

indiferente
Meaning
having no particular interest or concern; not caring one way or another
Example
She was indifferent to the outcome of the match.
Ella estaba indiferente al resultado del partido.
C2 noun /ˈaɪdlər/

idler

holgazán
Meaning
A person who avoids work or spends time lazily.
Example
He was known as an idler who wasted his days.
Él era conocido como un holgazán que desperdiciaba sus días.
C1 adjective /ɪnˈdʌktɪv/

inductive

inductivo
Meaning
characterized by the inference of general laws from particular instances; reasoning from specific cases to general principles
Example
The scientist used inductive reasoning to form a hypothesis.
El científico usó razonamiento inductivo para formular una hipótesis.
C1 adjective /ˌaɪ.di.əˈlɒdʒ.ɪ.kəl/

ideological

ideológico
Meaning
Relating to or based on a system of ideas or beliefs.
Example
The two parties are divided by deep ideological differences.
Las dos partes están divididas por profundas diferencias ideológicas.
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.
C2 noun /ɪˈrʌp.ʃən/

Irruption

una entrada violenta repentina; una invasión o incursión; una explosión o erupción repentina
Meaning
a sudden violent entry; an invasion or raid; a sudden outburst or eruption
Example
The army's irruption into enemy territory caught the opposing forces completely off guard.
La irrupción del ejército en el territorio enemigo sorprendió completamente a las fuerzas opuestas.
A2 verb /ɪnˈvaɪtɪd/

invited

invitado
Meaning
asked someone formally or politely to go somewhere or do something
Example
She was invited to the party.
Ella fue invitada a la fiesta.
B1 verb ɪnˈspaɪər

inspire

inspirar
Meaning
To fill someone with the urge or ability to do or feel something, especially creative or noble.
Example
Artemis seeks to inspire future generations.
Artemis busca inspirar a las generaciones futuras.
A2 adjective, noun /ɪˈtæliən/

italian

felicidad
Meaning
relating to Italy, its people, or its language; a person from Italy
Example
She loves Italian food.
Ella no pudo esconder su felicidad cuando recibió el premio.
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.
C1 adjective ˌɪn.krəˈmen.təl

incremental

incremental
Meaning
Relating to or denoting an increase or addition, especially one of a series on a fixed scale; proceeding in small stages.
Example
Incremental changes ensure sustainability.
Los cambios incrementales aseguran la sostenibilidad.
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.
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.
C1 adjective /ɪˈrɛvəkəbl/

irrevocable

irreversible
Meaning
Not able to be revoked, changed, or undone.
Example
She made an irrevocable decision to leave the company.
Ella tomó una decisión irreversible de dejar la empresa.
C1 noun /ɪnˈsɒm.ni.ə/

Insomnia

insomnio
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.
Su insomnio crónico le dificultaba concentrarse durante las horas de trabajo.
C1 adjective /ɪnˈseɪʃəbl̩/

insatiable

insaciable
Meaning
impossible to satisfy; always wanting more
Example
Her insatiable curiosity drove her to read every book in the library.
Su insaciable curiosidad la llevó a leer todos los libros de la biblioteca.
C1 noun /ɪnˈhɛrɪtər/

inheritor

heredero
Meaning
a person who receives money, property, or a title when someone dies
Example
She became the inheritor of her family's estate.
Ella se convirtió en la heredera de la propiedad de su familia.
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 verb /ɪnˈdʒɛkt/

inject

inyectar
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.
La enfermera inyectará la vacuna en el brazo del paciente.
C1 adjective /ˌaɪdiəˈlɪstɪk/

Idealistic

idealista
Meaning
pursuing high principles or ideals; unrealistically optimistic
Example
She has an idealistic view of changing the world.
Ella tiene una visión idealista de cambiar el mundo.
C2 noun /ˈɪkθiəˌsɔːrz/

ichthyosaurs

ictiosaurios (un tipo de reptil marino extinto)
Meaning
Extinct marine reptiles that resembled fish and dolphins, dominant during the Mesozoic era.
Example
Ichthyosaurs were swift predators of the ancient seas.
Los ictiosaurios eran depredadores rápidos de los mares antiguos.
C1 noun /ɪmˌpɜː.sənˈeɪ.ʃən/

impersonation

suplantación
Meaning
The action of pretending to be another person for the purpose of entertainment or fraud.
Example
Online impersonation is a serious cybercrime.
La suplantación en línea es un crimen cibernético grave.
C1 adjective ɪnɪɡˈzɔːstɪbəl

inexhaustible

inagotable
Meaning
Unable to be used up or worn out; limitless.
Example
His inexhaustible energy allowed him to work tirelessly on his projects.
Su energía inagotable le permitió trabajar incansablemente en sus proyectos.
C2 adjective /ˌɪɡ.nəˈmɪn.i.əs/

ignominious

ignominioso
Meaning
Marked by shame, disgrace, or humiliation.
Example
The team suffered an ignominious defeat in the finals.
El equipo sufrió una ignominiosa derrota en la final.
B2 adjective /ɪmˈprɒp.ər/

Improper

impropio; incorrecto; inapropiado
Meaning
inappropriate; incorrect; not suitable
Example
It would be improper to discuss personal matters in a business meeting.
Sería impropio discutir asuntos personales en una reunión de negocios.
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 /ɪnˈkɑːdʒɪtənt/

incogitant

desconsiderado
Meaning
Lacking thought; inconsiderate or thoughtless.
Example
It was incogitant of him to make such a rude comment.
Fue incogitante de su parte hacer un comentario tan grosero.
B2 noun /ɪnˈkluːʒən/

inclusion

inclusión
Meaning
the action or state of including or being included within a group or structure
Example
Diversity and inclusion are key values in modern workplaces.
La diversidad y la inclusión son valores clave en los lugares de trabajo modernos.
B2 verb /ɪnˈspekt/

inspect

inspeccionar
Meaning
to examine something carefully to check for problems or faults
Example
The engineer will inspect the building for structural damage.
El ingeniero inspeccionará el edificio por daños estructurales.
B1 verb /ɪnˈsɪst/

insist

insistir
Meaning
to demand firmly; to state persistently
Example
He insisted on paying the bill.
Él insistió en pagar la cuenta.