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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.
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.
C2 adjective /ˌɪnˈekspɜːrt/

inexpert

inexperto
Meaning
not skilled or experienced; lacking expertise
Example
The inexpert handling of the machine caused several mistakes.
El manejo inexperto de la máquina causó varios errores.
C2 verb /ɪnˈveɪɡəl/

inveigle

engatusar
Meaning
To persuade someone to do something by deception or flattery.
Example
She inveigled him into signing the contract.
Ella lo engañó para que firmara el contrato.
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.
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.
C2 noun /ɪˌledʒ.əˈbɪl.ə.ti/

Illegibility

ilegibilidad
Meaning
the quality of being impossible or difficult to read; unclear writing or print
Example
The doctor's handwriting was famous for its illegibility among the pharmacy staff.
La letra del médico era famosa por su ilegibilidad entre el personal de la farmacia.
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.
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 noun /ɪmˈpʌlʃən/

impulsion

impulso
Meaning
a strong urge or drive to act; the act of impelling
Example
His impulsion to travel made him leave his job suddenly.
Su impulso de viajar lo llevó a dejar su trabajo de repente.
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.
C2 adjective /aɪˈdɒlətrəs/

idolatrous

idólatra
Meaning
Excessively admiring or worshipping someone or something as an idol.
Example
The king was criticized for his idolatrous devotion to wealth.
El rey fue criticado por su devoción idólatra hacia la riqueza.
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.
C2 noun /ˌɪntərˈsɛʃən/

intercession

intercesión
Meaning
the act of intervening or pleading on behalf of another person
Example
The prisoner was released due to the intercession of influential leaders.
El prisionero fue liberado gracias a la intercesión de líderes influyentes.
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.
C2 adjective /ˌɪrɪˈkɒnsɪləbl/

irreconcilable

irreconciliable
Meaning
impossible to make compatible or bring into harmony; unable to resolve differences
Example
The couple separated due to irreconcilable differences.
La pareja se separó debido a diferencias irreconciliables.
C2 adjective /ɪmˈperɪʃəbəl/

Imperishable

imperdurable; eterno; imperecedero
Meaning
not subject to decay; lasting forever; eternal
Example
The imperishable beauty of classical art continues to inspire generations.
La belleza imperecedera del arte clásico sigue inspirando generaciones.
C2 adjective /ɪnˈkoʊ.ɪt/ or /ɪnˈkoʊ.eɪt/

inchoate

incompleto
Meaning
Just begun and not fully formed; rudimentary.
Example
His inchoate ideas needed more research to be developed.
Sus ideas incompletas necesitaban más investigación para ser desarrolladas.
C2 noun /ˌɪmprɪˈmɑːtər/

imprimatur

imprimátur
Meaning
An official license or approval, especially to publish a book.
Example
The book was released with the official imprimatur of the church.
El libro fue lanzado con el imprimátur oficial de la iglesia.
C2 noun /ɪnˈtɛmpərəns/

intemperance

intemperancia
Meaning
Lack of moderation or self-control, especially with drinking or eating.
Example
His intemperance in drinking ruined his health.
Su intemperancia al beber arruinó su salud.
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.
C2 adjective /ˌɪrɪˈmiːdiəbl̩/

irremediable

irremediable
Meaning
Impossible to cure, repair, or remedy.
Example
The damage to the ancient manuscript was irremediable.
El daño al antiguo manuscrito era irremediable.
C2 verb ˈɪnʌndeɪt

inundate

inundar, abrumar a alguien o algo con cosas o personas que se deben manejar
Meaning
To flood; overwhelm someone or something with things or people to be dealt with
Example
The company was inundated with requests after the advertisement.
La empresa fue inundada con solicitudes después del anuncio.
C2 verb /aɪˈdɒləˌtraɪz/

idolatrize

idolatrar
Meaning
To worship idols; to regard with excessive devotion or admiration.
Example
They began to idolatrize the statue as a deity.
Comenzaron a idolatrar la estatua como una deidad.
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 verb /ˈɪmprɪkeɪt/

imprecate

imprecate
Meaning
To utter a curse or invoke evil upon someone.
Example
The old woman imprecated her enemies with dark words.
La vieja mujer imprecó a sus enemigos con palabras oscuras.
C2 adjective /ɪnˈɛstɪməbl/

inestimable

invaluable
Meaning
Too great or valuable to be measured or estimated.
Example
Her contribution to the project was of inestimable value.
Su contribución al proyecto fue de un valor invaluable.
C2 adjective /ɪˈrɛfrəɡəbəl/

irrefragable

irrefutable
Meaning
Impossible to refute, deny, or break
Example
The lawyer presented irrefragable evidence that proved his client’s innocence.
El abogado presentó pruebas irrefutables que demostraron la inocencia de su cliente.
C2 adjective /ɪnˈsɛndiˌɛri/

incendiary

incendiario / provocador
Meaning
designed to cause fires or stir up conflict
Example
The politician’s incendiary remarks angered the crowd.
Las declaraciones incendiarias del político enfurecieron a la multitud.
C2 adjective /ɪnˈvaɪələt/

inviolate

inviolado
Meaning
free from violation, injury, or desecration; kept safe and untouched
Example
The ancient temple remained inviolate for centuries.
El antiguo templo permaneció inviolado durante siglos.
C2 noun /ˈɪn.tɪ.ɡreɪ.tɪv dɪˈpləʊ.mə.si/

integrative diplomacy

diplomacia integradora
Meaning
A diplomatic approach that seeks to combine or coordinate different elements, interests, or parties into a unified whole.
Example
Integrative diplomacy strengthens alliances.
La diplomacia integradora fortalece las alianzas.
C2 adjective /ˌɪnkoʊˈɜːrsəbl̩/

incoercible

incoercible
Meaning
Not capable of being forced, compelled, or restrained.
Example
Her incoercible spirit inspired others to fight for justice.
Su espíritu incoercible inspiró a otros a luchar por la justicia.
C2 adjective /ɪnˈvʌlnərəbl/

invulnerable

invulnerable
Meaning
Impossible to harm, damage, or defeat.
Example
The fortress was thought to be invulnerable to attack.
Se pensaba que la fortaleza era invulnerable al ataque.
C2 adjective /ɪnˈɡlɔːriəs/

inglorious

deshonroso
Meaning
Causing shame or disgrace; not bringing honor or glory.
Example
The army suffered an inglorious defeat.
El ejército sufrió una derrota deshonrosa.
C2 adjective /ˌɪn.trəˈmjʊə.rəl/

intramural

dentro de la institución
Meaning
Occurring within the walls of a single institution, especially a school or college.
Example
The college organizes intramural sports competitions every semester.
La universidad organiza competencias deportivas intramuros cada semestre.
C2 adjective /ɪˈrɛzəluːt/

irresolute

indeciso
Meaning
uncertain or indecisive; lacking determination
Example
He stood irresolute at the crossroads, unsure which path to take.
Él se quedó indeciso en el cruce de caminos, sin saber qué camino tomar.
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.
C2 noun /ɪnˈkɒnstənsi/

inconstancy

inconstancia
Meaning
The quality of changing frequently or being unreliable.
Example
The inconstancy of the weather makes planning difficult.
La inconstancia del clima hace que planificar sea difícil.
C2 noun /ˌɪkθiˈɒlədʒɪst/

ichthyologist

icthyólogo
Meaning
A scientist who studies fish.
Example
The ichthyologist discovered a new species of fish in the river.
El icthyólogo descubrió una nueva especie de pez en el río.
C2 verb /ɪnˈɡrɑːft/

ingraft

implantar
Meaning
To implant or fix deeply, often used in the sense of grafting an idea or quality.
Example
The teacher tried to ingraft good manners in the students.
El maestro trató de implantar buenos modales en los estudiantes.
C2 adjective /ɪnˈfɜːrnəl/

infernal

infernal
Meaning
relating to hell; extremely troublesome or annoying
Example
The workers complained about the infernal noise from the construction site.
Los trabajadores se quejaron del ruido infernal proveniente del sitio de construcción.
C2 adjective /ˌɪrɪˈtriːvəbl/

irretrievable

irrecuperable
Meaning
impossible to recover or regain
Example
The documents were lost in an irretrievable way after the fire.
Los documentos se perdieron de manera irrecuperable después del incendio.
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.
C2 adverb /ˌɪnəzˈmʌtʃ/

inasmuch

en la medida en que
Meaning
To the extent that; considering that.
Example
Inasmuch as you are their teacher, you should guide them carefully.
En la medida en que eres su maestro, deberías guiarlos cuidadosamente.
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.
C2 noun /ˈɪntərˌveɪl/

intervale

terreno bajo a lo largo de un río, generalmente fértil y plano
Meaning
A low-lying tract of land along a river, usually fertile and flat.
Example
The farmers cultivated crops on the lush intervale by the river.
Los agricultores cultivaron cosechas en el intervalo fértil junto al río.
C2 adjective /ˌɪnkəˈməʊdiəs/

incommodious

incómodo
Meaning
Uncomfortably small, cramped, or inconvenient.
Example
We had to stay in an incommodious room during the trip.
Tuvimos que quedarnos en una habitación incómoda durante el viaje.
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.
C2 noun /ˌɪnˌkeɪpəˈbɪləti/

incapability

incapacidad
Meaning
lack of ability or power to do something; inability or incompetence
Example
His incapability to manage the team led to serious problems.
Su incapacidad para gestionar el equipo provocó problemas graves.
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.
C2 adjective /ɪnˈtræn.sɪ.dʒənt/

intransigent

intransigente, terco, obstinado
Meaning
Unwilling or refusing to change one's views or to agree about something.
Example
His intransigent stance delayed the agreement.
Su postura intransigente retrasó el acuerdo.
C2 noun /aɪˈkɒnəklæst/

iconoclast

iconoclasta
Meaning
A person who attacks or criticizes cherished beliefs, traditions, or institutions.
Example
He was known as an iconoclast who challenged old traditions.
Era conocido como un iconoclasta que desafiaba las viejas tradiciones.
C2 adjective /ɪnˈkɒntɪnənt/

incontinent

incontinente
Meaning
lacking control over urination or defecation; lacking self-restraint
Example
The patient was incontinent after surgery.
El paciente era incontinente después de la cirugía.
C2 adjective /aɪˈsɒ.krə.nəs/

isochronous

aconteciendo a intervalos de tiempo iguales
Meaning
Occurring at equal time intervals; in unison or synchrony.
Example
The pendulum swings are isochronous, repeating at equal intervals.
Los oscilaciones del péndulo son isócronos, repitiendo a intervalos iguales.
C2 adjective /ˌɪnɪkˈspiːdiənt/

inexpedient

desaconsejable
Meaning
Not advisable, suitable, or practical in the circumstances.
Example
It would be inexpedient to invest without proper research.
Sería desaconsejable invertir sin una investigación adecuada.
C2 verb /ɪnˈdaɪt/

indite

componer
Meaning
To write or compose (literary or formal works).
Example
The poet indited a heartfelt sonnet.
El poeta compuso un soneto sincero.
C2 adjective /ˈɪm.pi.əs/

Impious

impío; blasfemo
Meaning
irreligious; lacking reverence for religion; blasphemous
Example
The impious act shocked the religious community.
El acto impío sorprendió a la comunidad religiosa.
C2 noun /ɪˈnænɪti/

inanity

tonterías, necedades
Meaning
a nonsensical remark or action; silliness; emptiness
Example
The speech was full of inanities that bored the audience.
El discurso estaba lleno de tonterías que aburrían a la audiencia.
C2 noun /ɪmˈbroʊlioʊ/

imbroglio

embrollo
Meaning
An extremely confused, complicated, or embarrassing situation.
Example
The political imbroglio lasted for months without resolution.
El embrollo político duró meses sin resolución.
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.
C2 adjective /ɪnˈdjuːbɪtəbl/

indubitable

indudable
Meaning
Impossible to doubt; unquestionable.
Example
It is indubitable that hard work leads to success.
Es indudable que el trabajo duro lleva al éxito.
C2 noun /ˈɪl.i.æd/

iliad

Ilíada
Meaning
An ancient Greek epic poem attributed to Homer, describing the events of the Trojan War.
Example
Students studied the Iliad to understand Greek mythology and heroism.
Los estudiantes estudiaron la Ilíada para entender la mitología griega y el heroísmo.
C2 adjective /ˌɪnɪˈsɛnʃəl/

inessential

inesencial
Meaning
not necessary or important; not essential
Example
The report removes all inessential details to stay focused.
El informe elimina los detalles inesenciales para mantenerse enfocado.
C2 adjective /ˈɪnˌbrɛd/

inbred

innato
Meaning
existing naturally in a person or animal; also related to reproduction within a limited community
Example
He has an inbred sense of loyalty.
Él tiene un sentido innato de lealtad.
C2 noun /ɪnˈtɒksɪkənt/

intoxicant

intoxicante
Meaning
a substance, especially alcohol or a drug, that causes intoxication
Example
Alcohol is the most commonly used intoxicant in many cultures.
El alcohol es el intoxicante más comúnmente usado en muchas culturas.
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.
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 adjective /ɪnˈkoʊətɪv/

inchoative

incipiente
Meaning
relating to the beginning of something; in an initial stage
Example
The poet used inchoative expressions to depict the dawn of creation.
El poeta utilizó expresiones incipientes para describir el amanecer de la creación.
C2 adjective /ɪnˈsuːsiənt/

insouciant

despreocupado
Meaning
Showing a casual lack of concern; carefree.
Example
He gave an insouciant shrug and walked away.
Hizo un encogimiento de hombros despreocupado y se alejó.
C2 verb /ɪnˈfætʃueɪt/

infatuate

embelesar
Meaning
to inspire with an intense but short-lived passion or admiration
Example
He was infatuated with her beauty.
Él estaba fascinado por su belleza.
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.
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 ˌɪm.pəˈtɜː.bə.bəl

imperturbable

imperturbable
Meaning
Unable to be upset or excited; not easily disturbed.
Example
His imperturbable nature made him a great leader.
Su naturaleza imperturbable lo convirtió en un gran líder.
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.
C2 noun /ɪmˈpaɪ.ə.ti/

Impiety

impiedad
Meaning
lack of piety or reverence, especially for a god; disrespect or irreverence toward religious matters
Example
His impiety shocked the religious community when he mocked their sacred ceremonies.
Su impiedad sorprendió a la comunidad religiosa cuando se burló de sus ceremonias sagradas.
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.
C2 adjective /ˌɪndɪˈsɜːrnəbl/

indiscernible

indistinguible
Meaning
Impossible or difficult to see, notice, or distinguish.
Example
The difference between the two shades was almost indiscernible.
La diferencia entre los dos tonos era casi indistinguible.
C2 noun /ɪnˈtɜːrstɪs/

interstice

hendidura
Meaning
a small space that lies between things
Example
Light filtered through the narrow interstices of the wall.
La luz se filtró a través de las estrechas hendiduras de la pared.
C2 noun /ɪnˌtɛl.ɪˈdʒɛntsi.ə/

intelligentsia

intelectuales
Meaning
The group of people engaged in intellectual and cultural pursuits in a society.
Example
The intelligentsia played a key role in shaping public opinion.
Los intelectuales jugaron un papel clave en la formación de la opinión pública.
C2 noun /ɪnˈsɪɡniə/

insignia

insignia
Meaning
A badge or symbol that shows rank, position, or membership.
Example
The soldier proudly wore the insignia of his regiment.
El soldado llevaba orgulloso la insignia de su regimiento.
C2 adverb /ɪnˈdjuːbɪtəbli/

indubitably

indudablemente
Meaning
Without a doubt; certainly.
Example
She is indubitably the best candidate for the job.
Ella es indudablemente la mejor candidata para el trabajo.
C2 adjective /ˌɪrɪˈfrændʒɪbəl/

irrefrangible

irrefrenable
Meaning
Not to be broken, violated, or infringed
Example
The constitution guarantees certain irrefrangible rights to every citizen.
La constitución garantiza ciertos derechos irrefrenables a cada ciudadano.
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.
C2 noun /ˈɪntəˌkrɒpɪŋ/

intercropping

cultivo intercalado
Meaning
The agricultural practice of cultivating two or more crops simultaneously in the same field to maximize land use efficiency and improve soil health.
Example
Intercropping can help improve soil fertility and pest control.
El cultivo intercalado puede ayudar a mejorar la fertilidad del suelo y el control de plagas.
C2 adjective /ɪˈmɒdərət/

immoderate

excesivo
Meaning
excessive; beyond reasonable limits
Example
He has an immoderate love for sweets.
Él tiene un amor excesivo por los dulces.
C2 noun /ˈɪnˌɡreɪt/

ingrate

ingrato
Meaning
An ungrateful person; someone who shows no appreciation.
Example
He worked hard for his friend, but the ingrate never thanked him.
Trabajó duro para su amigo, pero el ingrato nunca le dio las gracias.
C2 noun /ˌɪnkrɪˈdjuːləti/

incredulity

incredulidad
Meaning
the state of being unwilling or unable to believe something
Example
She looked at him with incredulity after hearing the strange story.
Ella lo miró con incredulidad después de escuchar la extraña historia.
C2 verb /ɪnˈhjuːm/

inhume

inhumar
Meaning
to bury a dead body in the ground
Example
They inhumed the warrior with full honors.
Ellos inhumaron al guerrero con todos los honores.
C2 verb /ˌɪntərˈlɒk/

interlock

encajar
Meaning
to fit or connect together securely so that two or more things are joined
Example
The gears interlock to ensure smooth movement of the machine.
Los engranajes encajan para asegurar el movimiento suave de la máquina.
C2 noun /ˌɪmbəˈsɪləti/

imbecility

imbecilidad
Meaning
Extreme foolishness, stupidity, or weakness of mind.
Example
The plan was abandoned due to its sheer imbecility.
El plan fue abandonado debido a su pura imbecilidad.
C2 noun /ˈɪrɪtənsi/

irritancy

irritación
Meaning
the quality or state of causing irritation; legal or formal invalidation
Example
The constant noise became an irritancy to the neighbors.
El ruido constante se convirtió en una irritación para los vecinos.
C2 noun /ˈɪrɪɡənt/

irrigant

líquido de riego
Meaning
A liquid used for irrigation, especially in medical or agricultural contexts.
Example
The doctor used a sterile irrigant during the procedure.
El doctor usó un irrigante estéril durante el procedimiento.
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.
C2 noun /ɪnˈɛrənsi/

inerrancy

inerrancia
Meaning
the belief or quality of being free from error; absolute correctness
Example
Some religious groups strongly affirm the inerrancy of their sacred texts.
Algunos grupos religiosos afirman fuertemente la inerrancia de sus textos sagrados.
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.
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.
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.
C2 noun /ˌɪnkænˈteɪʃən/

incantation

encantación
Meaning
a series of words used as a magic spell or charm
Example
The wizard chanted an incantation to summon the spirits.
El mago recitó una encantación para invocar los espíritus.
C2 adjective /ɪˈnɪm.ɪ.tə.bəl/

inimitable

inimitable
Meaning
So good or unusual as to be impossible to copy; unique.
Example
His inimitable writing style made him a literary legend.
Su estilo de escritura inimitable lo convirtió en una leyenda literaria.
C2 verb /ɪˈluːmɪn/

illumine

iluminar
Meaning
to light up or make clear
Example
The rising sun illumined the mountain peaks.
El sol naciente iluminó las cumbres de la montaña.
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.
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.
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 /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 /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.
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 ˈɪn.kʌl.keɪt

inculcate

inculcar
Meaning
Instill an attitude, idea, or habit by persistent instruction; to teach and impress by frequent repetitions.
Example
Parents should inculcate good values in their children.
Los padres deberían inculcar buenos valores en sus hijos.
C2 adjective /ˌɪn.trəˈsɛl.jʊ.lər/

intracellular

dentro de la célula
Meaning
Located or occurring within a cell.
Example
The drug works by targeting intracellular bacteria.
El medicamento funciona al dirigirse a las bacterias intracelulares.
C2 noun /ˌɪnvəˈluːʃən/

involution

involución
Meaning
a complicated or intricate form or state; in biology, the shrinking of an organ after its function has finished
Example
The story was full of involution, making it hard to follow.
La historia estaba llena de involución, lo que hacía difícil de seguir.
C2 adjective /ɪˈlɪbərəl/

illiberal

iliberal
Meaning
Opposed to liberal principles; restricting freedom of thought or behavior.
Example
The government was criticized for its illiberal policies.
El gobierno fue criticado por sus políticas iliberales.
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.
C2 noun /ɪnˈvɛktɪv/

invective

lenguaje insultante
Meaning
Insulting, abusive, or highly critical language.
Example
The politician’s speech was filled with invective against his opponents.
El discurso del político estaba lleno de invectivas contra sus oponentes.
C2 verb /ˈɪmprɛɡneɪt/

impregnate

embarazar / impregnar
Meaning
To make pregnant; to fill or saturate with something.
Example
The scientist used a method to impregnate the material with resin.
El científico utilizó un método para impregnar el material con resina.
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.
C2 noun /ɪˈmɒdəsti/

immodesty

immodestia
Meaning
lack of modesty or decency; behavior or attitude that is overly bold or improper
Example
The article was criticized for its tone of immodesty.
El artículo fue criticado por su tono de immodestia.
C2 noun /ˈɪmpjʊdəns/

impudence

desvergüenza
Meaning
Rude and disrespectful behavior.
Example
The student's impudence shocked the entire class.
La desvergüenza del estudiante sorprendió a toda la clase.
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.
C2 noun /ˌɪntərˈrɛɡnəm/

interregnum

interregno
Meaning
A period between rulers or governments when normal leadership is suspended.
Example
The country faced instability during the interregnum after the king’s death.
El país enfrentó inestabilidad durante el interregno después de la muerte del rey.
C2 adverb /ˈɪntʃmiːl/

inchmeal

poco a poco
Meaning
Gradually, little by little.
Example
The old castle fell inchmeal into ruin.
El viejo castillo cayó poco a poco en ruinas.
C2 adjective /ˌɪndɪˈsɒljʊbl/

indissoluble

Indisoluble
Meaning
Unable to be destroyed, broken, or dissolved.
Example
Marriage was once considered an indissoluble bond.
El matrimonio alguna vez fue considerado un vínculo indisoluble.
C2 noun /ˈɪnsələns/

insolence

insolencia
Meaning
rude or disrespectful behavior
Example
The teacher was shocked by the student's insolence.
El maestro se sorprendió por la insolencia del estudiante.