introvert
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C1 noun /ˈɪn.trə.vɜːrt/

introvert

introvertido
Meaning
A person who tends to be shy and prefers spending time alone rather than in groups.
Example
As an introvert, he preferred reading over attending parties.
Como introvertido, prefería leer en lugar de asistir a fiestas.
A2 verb /ɪnˈkluːd/

include

incluir
Meaning
to have as part of a whole; to contain or comprise
Example
The price includes all taxes.
El precio incluye todos los impuestos.
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.
B1 noun /ɪnˈɡriːdiənt/

ingredient

ingrediente
Meaning
A component part or element of something, especially in a recipe.
Example
Flour is a key ingredient in baking bread.
La harina es un ingrediente clave en la preparación del pan.
B2 noun /ɪnˈventər/

inventor

inventor
Meaning
a person who creates or designs something new, especially a device, method, or process
Example
The inventor patented her new medical device.
El inventor patentó su nuevo dispositivo médico.
C2 adjective /ɪˈlɪmɪtəbl/

illimitable

ilimitado
Meaning
Without limits or bounds.
Example
The universe is often described as illimitable.
El universo a menudo se describe como ilimitado.
B2 adjective /ɪˈreɡjələr/

irregular

irregular
Meaning
not even or consistent in shape, pattern, time, or behavior; not following normal rules
Example
His attendance at work has been irregular this month.
Su asistencia al trabajo ha sido irregular este mes.
B2 verb /ɪnˈflɪkt/

inflict

infligir
Meaning
to cause something unpleasant or painful to be suffered by someone or something
Example
The storm inflicted considerable damage to the city.
La tormenta infligió un daño considerable a la ciudad.
C2 noun /ɪnˈsɪpiəns/

incipience

inicio
Meaning
the beginning or initial stage of something
Example
The project was still in its incipience when funding was approved.
El proyecto aún estaba en su inicio cuando se aprobó la financiación.
C1 verb /ɪnˈkɜːr/

incur

incurrir
Meaning
To bring upon oneself something undesirable, usually as a result of actions.
Example
He incurred a fine for parking in the wrong place.
Él incurrió en una multa por aparcar en el lugar equivocado.
C1 noun /ɪnˈdɪɡ.nə.ti/

Indignity

indignidad; humillación; deshonra;
Meaning
treatment or circumstances that cause one to feel shame or loss of dignity; humiliation
Example
She refused to suffer the indignity of being searched without proper cause.
Ella se negó a sufrir la indignidad de ser registrada sin causa justificada.
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.
C1 verb /ɪnˈsaɪt/

incite

incitar
Meaning
to provoke; to stir up
Example
His speech incited the crowd to violence.
Su discurso incitó a la multitud a la violencia.
C2 adjective /ɪnˈdɛkərəs/

indecorous

indecoroso
Meaning
Not in keeping with good taste and propriety; improper.
Example
His indecorous behavior shocked the audience.
Su comportamiento indecoroso sorprendió a la audiencia.
C1 noun /ˌɪntərˈmiːdiˌɛri/

intermediary

intermediario
Meaning
A person who acts as a link between people in order to try to bring about an agreement; a mediator.
Example
The diplomat served as an intermediary between the two conflicting nations.
El diplomático actuó como intermediario entre las dos naciones en conflicto.
C2 noun /ˌaɪ.diˈeɪ.ʃən/

ideation

El proceso de formar y desarrollar nuevas ideas o conceptos mediante pensamiento creativo y lluvia de ideas.
Meaning
The process of forming and developing new ideas or concepts through creative thinking and brainstorming.
Example
The team engaged in ideation sessions to generate new product ideas.
El equipo participó en sesiones de ideación para generar nuevas ideas de productos.
B1 verb ɪnˈvɛst

invest

invertir
Meaning
To put money, effort, time, etc. into something to make a profit or get an advantage.
Example
Investing in intellectual property can generate passive income.
Invertir en propiedad intelectual puede generar ingresos pasivos.
C1 noun /ɪnˈdʒʌŋkʃən/

injunction

orden judicial
Meaning
A judicial order restraining a person from an action or compelling a certain act.
Example
The court issued an injunction to stop the company from polluting the river.
El tribunal emitió una orden judicial para evitar que la empresa contaminara el río.
C1 noun ˌɪnfɛsˈteɪʃən

infestation

infestación, gran número de insectos o animales en un lugar
Meaning
The presence of an unusually large number of insects or animals in a place, causing damage or disease.
Example
The infestation of ants in the kitchen led to immediate pest control measures.
La infestación de hormigas en la cocina llevó a medidas inmediatas de control de plagas.
B2 adjective ˈɪn.tɪ.ɡrəl

integral

integral
Meaning
Necessary to make a complete whole; essential or fundamental.
Example
Exercise is an integral part of a healthy lifestyle.
El ejercicio es una parte integral de un estilo de vida saludable.
C2 adjective /ɪnˈkɒŋɡruənt/

incongruent

incongruente
Meaning
Not in harmony or keeping with the surroundings or other aspects.
Example
His casual outfit looked incongruent at the formal dinner.
Su atuendo casual se veía incongruente en la cena formal.
C2 noun /ɪmˌpɜːrtərbəˈbɪləti/

imperturbability

imperturbabilidad
Meaning
The quality of being calm and not easily disturbed or upset.
Example
Her imperturbability during the crisis impressed everyone.
Su imperturbabilidad durante la crisis impresionó a todos.
C1 adjective /ˈaɪərnˌklæd/

ironclad

inquebrantable
Meaning
impossible to change, break, or dispute; very strong and firm
Example
The company had an ironclad contract with its suppliers.
La empresa tenía un contrato inquebrantable con sus proveedores.
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.
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.
A2 verb /ɪˈmædʒɪn/

imagine

imaginar
Meaning
to form a mental image of; to believe something unreal to be true
Example
Can you imagine living in a different country?
¿Puedes imaginar vivir en un país diferente?
C2 noun /ˌɪn.təˈvɛn.ʃə.nɪ.zəm/

interventionism

intervencionismo
Meaning
Government policy of active involvement in economic affairs.
Example
The central bank's interventionism helped stabilize inflation.
El intervencionismo del banco central ayudó a estabilizar la inflación.
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.
B1 verb /ɪnˈtend/

intend

intentar
Meaning
to plan or have in mind as a purpose; to mean
Example
I intend to finish this project by tomorrow.
Tengo la intención de terminar este proyecto para mañana.
A2 verb /ɪnˈvaɪt/

invite

invitar
Meaning
to ask someone to come to an event or to do something
Example
We should invite all our friends to the party.
Deberíamos invitar a todos nuestros amigos a la fiesta.
B2 noun ˌɪn.tɪˈɡreɪ.ʃən

integration

Integración. Unificación.
Meaning
The action or process of integrating; the process of combining or adding parts to make a unified whole.
Example
Integration of networks will improve global communication.
La integración de redes mejorará la comunicación global.
C2 noun /ˌɪrɪˈdɛsəns/

iridescence

brillo iridiscente
Meaning
a play of lustrous, changing colors like those of a rainbow
Example
The butterfly's wings shimmered with iridescence.
Las alas de la mariposa brillaban con brillo iridiscente.
C2 verb /ˌɪntərˈpoʊz/

interpose

interponer
Meaning
To place or insert between one thing and another; to intervene in a situation.
Example
He quickly interposed himself between the fighters to stop the quarrel.
Él rápidamente se interpuso entre los luchadores para detener la pelea.
B2 verb /ɪnˈsʌlt/

insult

insultar
Meaning
to speak or act in a way that hurts someone's feelings or shows disrespect
Example
He felt insulted by her rude comments.
Él se sintió insultado por sus comentarios groseros.
B2 noun /ɪsˈlɑːm/

islam

islám religión
Meaning
the religion founded by the Prophet Muhammad, based on belief in one God (Allah)
Example
Islam emphasizes peace, justice, and compassion.
El Islam enfatiza la paz, la justicia y la compasión.
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 noun ˌɪn.tuˈɪʃ.ən

intuition

intuición
Meaning
The ability to understand something immediately, without the need for conscious reasoning.
Example
Her intuition told her something was wrong.
Su intuición le dijo que algo estaba mal.
B1 noun ɪnˈtel.ɪ.dʒəns

intelligence

inteligencia
Meaning
The ability to learn, understand, and think in a logical way about things
Example
Intelligence is key in AI development.
La inteligencia es clave en el desarrollo de la IA.
C1 noun ˌɪn.fɪlˈtreɪ.ʃən

infiltration

infiltración, acceso secreto
Meaning
The process of entering or gaining access to an organization or place surreptitiously.
Example
Cybersecurity prevents infiltration into sensitive data.
La ciberseguridad previene la infiltración en datos sensibles.
C1 adjective ɪnˈtrɪn.zɪk

intrinsic

intrínseco, esencial, natural
Meaning
Belonging naturally; essential. Existing as a natural or basic part of something.
Example
Creativity is an intrinsic quality of a great artist.
La creatividad es una cualidad intrínseca de un gran artista.
C1 noun /ɪˌluːmɪˈneɪʃən/

illumination

iluminación
Meaning
the act of lighting something or making something clear
Example
The street was filled with bright illumination from the lamps.
La calle estaba llena de una iluminacion brillante proveniente de las lamparas.
C2 adjective /ɪˈmɪsəbl/

immiscible

inmiscible
Meaning
Describes liquids that do not mix together.
Example
Oil and water are immiscible liquids.
El aceite y el agua son líquidos inmiscibles.
C2 noun /ˈɪsməs/ or /ˈɪsθməs/

isthmus

istmo
Meaning
A narrow strip of land connecting two larger land areas, often with water on either side.
Example
The Panama Canal cuts through the Isthmus of Panama.
El Canal de Panamá corta a través del Istmo de Panamá.
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 /ˌɪnkɒmprɪˈhɛnsəbl/

incomprehensible

incomprensible
Meaning
Impossible or very difficult to understand.
Example
The professor’s lecture was so fast it became incomprehensible.
La conferencia del profesor fue tan rápida que se volvió incomprensible.
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 adjective /ɪnˈfæləbl̩/

infallible

infalible
Meaning
incapable of making mistakes or being wrong
Example
Her judgment seemed infallible in matters of finance.
Su juicio parecía infalible en cuestiones financieras.
C2 noun /ˈɪn.fɪ.del/

Infidel

infiel
Meaning
a person who does not believe in religion or whose religious beliefs differ from one's own
Example
In historical contexts, crusaders often referred to their enemies as infidels.
En contextos históricos, los cruzados a menudo se referían a sus enemigos como infieles.
C1 adjective /ɪnˈstɪŋk.tɪv/

instinctive

instintivo, natural, automático
Meaning
Based on instinct; done without conscious thought; natural and automatic.
Example
His instinctive reaction saved his life.
Su reacción instintiva le salvó la vida.
C2 noun /ˌɪnsəˈrɛkʃən/

insurrection

insurrección
Meaning
A violent uprising against an authority or government.
Example
The army was called in to suppress the insurrection.
El ejército fue llamado para sofocar la insurrección.
C2 adjective /ˌɪməˈmɔːriəl/

immemorial

inmemorial
Meaning
Extending back beyond memory or record; ancient.
Example
The tradition has been followed since time immemorial.
La tradición ha sido seguida desde tiempos inmemoriales.
B2 adjective /ɪnˈtækt/

intact

intacto
Meaning
Remaining whole, complete, and undamaged.
Example
Despite the storm, the old house remained intact.
A pesar de la tormenta, la casa antigua permaneció intacta.
B2 adjective /ˈɪnfɪnɪt/

infinite

infinito
Meaning
limitless or endless in space, extent, or number
Example
The universe is often described as infinite.
El universo a menudo se describe como infinito.
C2 adjective /ɪˈrædɪkəbəl/

irradicable

irradicable
Meaning
not able to be eradicated; impossible to destroy or remove completely
Example
The love of a mother for her child is irradicable.
El amor de una madre por su hijo es irradicable.
B1 adverb /ˈɪnstəntli/

instantly

instantáneamente
Meaning
immediately, without any delay
Example
He replied instantly to the message.
Él respondió instantáneamente al mensaje.
C2 noun /ˌɪnədˈvɜːrtəns/

inadvertence

descuido
Meaning
Failure to pay attention; carelessness.
Example
The error happened through sheer inadvertence.
El error ocurrió por pura inadvertencia.
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.
B2 adjective /ˌɪnəˈproʊpriət/

inappropriate

inapropiado
Meaning
not suitable or proper in the circumstances
Example
It was inappropriate to talk loudly in the library.
Era inapropiado hablar en voz alta en la biblioteca.
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 /ɪnˈveə.ri.ə.bəl/

Invariable

invariable; constante; siempre igual
Meaning
never changing; constant; always the same
Example
His invariable routine includes morning exercise and coffee.
Su rutina invariable incluye ejercicio por la mañana y café.
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 adjective /ˈɪn.dɪ.dʒənt/

indigent

indigente
Meaning
lacking the necessities of life due to poverty; very poor
Example
The hospital offers free care to indigent patients.
El hospital ofrece atención gratuita a los pacientes indigentes.
B2 noun /ˈɪmɪɡrənt/

immigrant

inmigrante
Meaning
a person who comes to live permanently in a foreign country
Example
The city has welcomed many new immigrants this year.
La ciudad ha dado la bienvenida a muchos nuevos inmigrantes este año.
B1 noun /ˈɪnsɪdənt/

incident

incidente
Meaning
an event or occurrence, often unpleasant or unusual
Example
The police quickly responded to the incident in the park.
La policía respondió rápidamente al incidente en el parque.
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.
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.
C1 noun /ˈɪnstɪˌɡeɪtər/

instigator

instigador
Meaning
A person who brings about or initiates something, usually something bad.
Example
The police identified him as the instigator of the violence.
La policía lo identificó como el instigador de la violencia.
A2 noun, verb /ˈɪʃuː/

issue

problema, publicación, distribución
Meaning
A problem, topic, or the act of supplying or distributing something.
Example
The magazine will issue a new edition next week.
La revista publicará una nueva edición la próxima semana.
B2 adjective /ɪˈrɪˌspɑn.sə.bəl/

Irresponsible

irresponsable
Meaning
lacking a sense of responsibility; careless
Example
It was irresponsible of him to leave without telling anyone.
Fue irresponsable de su parte irse sin decirle a nadie.
B2 noun /ɪnˈspɛktər/

inspector

inspector
Meaning
An official employed to ensure regulations are obeyed or standards are met.
Example
The inspector carefully checked the restaurant's kitchen for hygiene standards.
El inspector revisó cuidadosamente la cocina del restaurante para cumplir con los estándares de higiene.
B2 noun /ˌaɪ.səˈleɪ.ʃən/

Isolation

aislación
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.
El paciente fue mantenido en aislamiento para prevenir la propagación de la enfermedad infecciosa.
C1 noun /ˌɪnsɪɡˈnɪfɪkəns/

insignificance

insignificancia
Meaning
The quality of being unimportant or trivial.
Example
He felt a sense of insignificance in the vast universe.
Él sintió un sentido de insignificancia en el vasto universo.
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.
B2 verb /ɪmˈpoʊz/

impose

imponer
Meaning
to force someone to accept something; to establish or apply by authority
Example
The government imposed new taxes on luxury goods.
El gobierno impuso nuevos impuestos sobre los artículos de lujo.
B1 noun ɪˈnɪʃətɪv

initiative

iniciativa
Meaning
An act or strategy intended to resolve a difficulty or improve a situation; a fresh approach to something.
Example
NASA's initiative to return humans to the Moon is ambitious.
La iniciativa de la NASA para devolver a los humanos a la Luna es ambiciosa.
C1 verb /ɪnˈklaɪn/

incline

inclinarse
Meaning
to feel willing or favorably disposed toward something; to bend or tilt
Example
She is inclined to agree with the proposal.
Ella está inclinada a estar de acuerdo con la propuesta.
C2 adjective /ˌɪnfəˈlɪsɪtəs/

infelicitous

inadecuado
Meaning
not suitable or well chosen; awkward or unfortunate
Example
His infelicitous remark ruined the atmosphere of the meeting.
Su comentario inadecuado arruinó el ambiente de la reunión.
C1 verb /ɪnˈfjʊərieɪt/

infuriate

enfurecer
Meaning
To make someone extremely angry.
Example
His careless remarks infuriated the entire team.
Sus comentarios descuidados enfurecieron a todo el equipo.
C1 noun /ˌɪntəkəˈnɛktɪvɪti/

interconnectivity

interconectividad
Meaning
The state of being interconnected or the degree of connectivity between components
Example
The rise of interconnectivity has transformed global communication.
El auge de la interconectividad ha transformado la comunicación global.
B1 adjective ˈɪnəveɪtɪv

innovative

innovador
Meaning
Featuring new methods; advanced and original
Example
Innovative strategies are required to combat pollution.
Se requieren estrategias innovadoras para combatir la contaminación.
A2 adverb /ɪnˈdiːd/

indeed

en efecto
Meaning
used to emphasize or confirm a statement
Example
It was a long journey indeed.
Fue un largo viaje, de hecho.
C1 adjective ˌɪn.təˈstel.ər

interstellar

entre las estrellas, interestelar, cósmico
Meaning
Occurring or situated between stars.
Example
Scientists study interstellar travel possibilities.
Los científicos estudian las posibilidades de viajes interestelares.
B2 noun /ˈɪntərfeɪs/

interface

interfaz
Meaning
a point where two systems, subjects, or organizations meet and interact
Example
The user interface is designed to be intuitive and user-friendly.
La interfaz de usuario está diseñada para ser intuitiva y fácil de usar.
C2 noun /ˈænʒənuː/

ingenue

jovencita inocente
Meaning
an innocent, naïve young woman, especially as represented in literature or theater
Example
She played the role of the ingénue in the play with great charm.
Ella interpretó el papel de la jovencita inocente en la obra con gran encanto.
B2 adjective ˈaɪsəˌleɪtɪd

isolated

aislado
Meaning
Alone or separated from others; having little or no contact with other people.
Example
Technological advancements often leave people isolated.
Los avances tecnológicos a menudo dejan a las personas aisladas.
C1 adjective /ˈɪrɪtəbl/

irritable

irritable
Meaning
easily annoyed or made angry
Example
She became irritable after working long hours without rest.
Ella se volvió irritable después de trabajar muchas horas sin descanso.
B2 noun ɪnˈdʒʌstɪs

injustice

injusticia
Meaning
Lack of fairness or justice; the practice of being unjust or unfair.
Example
The story portrays the injustices faced by the common people.
La historia retrata las injusticias que enfrentan las personas comunes.
C2 noun /ˌɪnkrʌˈsteɪʃən/

incrustation

costra
Meaning
a crust or hard coating formed on the surface of something
Example
The old pipes were blocked due to heavy incrustation of minerals.
Las viejas tuberías estaban bloqueadas debido a una fuerte incrustación de minerales.
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.
A2 noun /ˈɪndʒəri/

injury

lesión
Meaning
Harm or damage to a person’s body caused by an accident or attack.
Example
He suffered a serious injury during the football match.
Sufrió una lesión grave durante el partido de fútbol.
C2 adjective /ˌaɪsəʊˈθɜːrməl/

isothermal

isotérmico
Meaning
Having or maintaining equal or constant temperature.
Example
The experiment was conducted under isothermal conditions.
El experimento se realizó bajo condiciones isotérmicas.
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.
C1 noun /ɪmˈpɛd.ɪ.mənt/

impediment

obstáculo
Meaning
A hindrance or obstruction in doing something; something that prevents progress.
Example
Lack of funds is a major impediment to the project.
La falta de fondos es un gran obstáculo para el proyecto.
C1 noun /ɪˈmɜː.ʃən/

immersion

inmersión
Meaning
Complete engagement in an environment or experience.
Example
Immersion in VR games makes users feel like they are inside the virtual world.
La inmersión en juegos de VR hace que los usuarios sientan como si estuvieran dentro del mundo virtual.
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.
C1 adjective /ˌɪnɔːrˈɡænɪk/

inorganic

inorgánico
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.
Los compuestos inorgánicos se estudian en los laboratorios.
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.
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.
C1 adjective /ˈɪnsjələr/

insular

limitado, relacionado con una isla
Meaning
Narrow-minded, isolated, or relating to an island.
Example
The community was criticized for its insular attitudes toward outsiders.
La comunidad fue criticada por sus actitudes insulares hacia los forasteros.
C1 verb /ɪnˈtruːd/

intrude

interrumpir
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.
Él se sintió avergonzado de interrumpir su conversación privada.
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
C2 adjective /ɪmˈpɒndərəbl̩/

imponderable

imponderable
Meaning
Something difficult or impossible to estimate, assess, or understand
Example
The outcome of the election depends on many imponderable factors.
El resultado de las elecciones depende de muchos factores imponderables.
C1 adjective, noun /ɪnˈdɪkətɪv/

indicative

indicativo
Meaning
Serving as a sign or expression of something; in grammar, a mood used to make factual statements.
Example
His tone was indicative of his frustration.
Su tono era indicativo de su frustración.
C1 adjective /ɪnˈdʌstriəs/

industrious

trabajador
Meaning
Hardworking and diligent in one's duties.
Example
She is an industrious student who always completes her assignments on time.
Ella es una estudiante trabajadora que siempre completa sus tareas a tiempo.
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.
B1 adjective /ɪnˈvɑːlvd/

involved

involucrado
Meaning
complicated or engaged in something
Example
She was deeply involved in community service.
Ella estaba profundamente involucrada en el servicio comunitario.
A2 adjective ˌɪn.təˈnæʃ.ən.əl

international

internacional
Meaning
Existing, occurring, or carried on between two or more nations and their citizens.
Example
International standards improve competitiveness.
Los estándares internacionales mejoran la competitividad.
C1 adjective /ɪnˈtɒl.ər.ə.bəl/

Intolerable

intolerable
Meaning
unable to be endured; extremely unpleasant or painful
Example
The noise from the construction site was intolerable.
El ruido de la obra de construcción era intolerable.
B2 adjective /aɪˈrɒnɪk/

ironic

irónico, sarcástico
Meaning
happening in the opposite way to what is expected, often amusing or sarcastic
Example
It is ironic that the fire station burned down.
Es irónico que la estación de bomberos se haya quemado.
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.
B1 noun /ɪnˌvɛs.tɪˈɡeɪ.ʃən/

investigation

investigación
Meaning
the process of inquiring into or examining something carefully to find the truth
Example
The investigation revealed new evidence about the fraud.
La investigación reveló nuevas pruebas sobre el fraude.
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.
C2 adjective /ˈɪl bred/

Ill-bred

maleducado
Meaning
lacking good manners; rude; showing poor upbringing
Example
His ill-bred behavior shocked everyone at the dinner party.
Su conducta maleducada dejó a todos sorprendidos en la cena.
B1 verb /ɪnˈkriːst/

increased

aumentado
Meaning
became greater in size, amount, or degree
Example
The company's revenue increased last year.
Los ingresos de la compañía aumentaron el año pasado.
C1 adjective /ɪnˈdʒʊəriəs/

injurious

perjudicial
Meaning
Causing or likely to cause harm or damage.
Example
Smoking is injurious to health.
Fumar es perjudicial para la salud.
B1 noun /ɪmˈpruːvmənt/

improvement

mejora
Meaning
the act of making something better
Example
There has been a significant improvement in his health.
Ha habido una mejora significativa en su salud.
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 adjective /ɪmˈpæʃənd/

impassioned

apasionado
Meaning
Filled with or showing great emotion.
Example
She gave an impassioned speech about human rights.
Ella dio un discurso apasionado sobre los derechos humanos.
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.
B1 abbreviation /ˌaɪˈiː/

ie

es decir
Meaning
That is to say; used to clarify or explain something more precisely.
Example
Many amphibians, i.e., frogs and salamanders, can live both in water and on land.
Muchos anfibios, es decir, ranas y salamandras, pueden vivir tanto en agua como en tierra.
C1 adjective /ˌɪnɪkˈskjuːzəbl/

inexcusable

inexcusable
Meaning
Too bad to be justified or overlooked; unforgivable.
Example
His rude behavior was inexcusable.
Su comportamiento grosero era inexcusable.