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C1 verb /ɪnˈtruːd/

intrude

einmischen
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.
Er fühlte sich peinlich berührt, in ihr privates Gespräch einzutreten.
B1 noun ɪnˈtel.ɪ.dʒəns

intelligence

Intelligenz
Meaning
The ability to learn, understand, and think in a logical way about things
Example
Intelligence is key in AI development.
Intelligenz ist der Schlüssel zur KI-Entwicklung.
B2 noun ɪˈmjuː.nɪ.ti

immunity

immunität
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.
Eine starke Immunität schützt vor Infektionen.
B2 noun /ɪsˈlɑːm/

islam

Islam Religion
Meaning
the religion founded by the Prophet Muhammad, based on belief in one God (Allah)
Example
Islam emphasizes peace, justice, and compassion.
Der Islam betont Frieden, Gerechtigkeit und Mitgefühl.
C1 noun ˌɪn.ɪˈfɪʃ.ən.si

inefficiency

Ineffizienz
Meaning
The state or quality of not achieving maximum productivity; failure to make the best use of time or resources.
Example
Government inefficiency leads to slow project completion.
Regierungsineffizienz führt zu langsamer Projektfertigstellung.
C1 adjective /ɪnˈseɪʃəbl̩/

insatiable

unersättlich
Meaning
impossible to satisfy; always wanting more
Example
Her insatiable curiosity drove her to read every book in the library.
Ihre unersättliche Neugier trieb sie dazu, jedes Buch in der Bibliothek zu lesen.
C1 adverb /ɪnˈvɜːrs.li/

Inversely

umgekehrt; entgegengesetzt
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.
Der Preis von Waren ist umgekehrt mit ihrer Verfügbarkeit auf dem Markt verbunden.
B2 verb /ˈɪnəveɪt/

innovate

innovieren
Meaning
To introduce new methods, ideas, or products.
Example
The company must innovate to stay ahead of its competitors.
Das Unternehmen muss innovieren, um seinen Konkurrenten voraus zu bleiben.
C1 verb /ɪnˈfrɪndʒ/

infringe

verletzen
Meaning
To actively break the terms of a law, agreement, or right.
Example
Copying this software without permission will infringe copyright laws.
Das Kopieren dieser Software ohne Erlaubnis wird gegen das Urheberrecht verstoßen.
C2 noun /ˈɪn.fɪ.del/

Infidel

Heiden
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.
In historischen Kontexten bezeichneten Kreuzfahrer ihre Feinde oft als Heiden.
C2 adjective /ɪmˈpælpəbəl/

impalpable

unfühlbar
Meaning
unable to be felt by touch; difficult to grasp or understand
Example
There was an impalpable sense of fear in the room.
Es gab ein unfühlbares Gefühl der Angst im Raum.
C1 adjective /ˈɪrɪtəbl/

irritable

reizbar
Meaning
easily annoyed or made angry
Example
She became irritable after working long hours without rest.
Sie wurde reizbar, nachdem sie lange Stunden ohne Ruhe gearbeitet hatte.
C1 noun /ɪnˈsɜːrdʒəns/

insurgence

Aufstand
Meaning
An act of rebellion or uprising against authority.
Example
The government struggled to contain the growing insurgence.
Die Regierung hatte Schwierigkeiten, den wachsenden Aufstand zu bekämpfen.
B2 adjective ˈaɪsəˌleɪtɪd

isolated

isoliert
Meaning
Alone or separated from others; having little or no contact with other people.
Example
Technological advancements often leave people isolated.
Technologische Fortschritte führen oft dazu, dass Menschen isoliert werden.
B2 verb /ˈaɪ.sə.leɪt/

isolate

isolieren
Meaning
To separate something or someone from others.
Example
Doctors tried to isolate the patient to prevent the spread of infection.
Die Ärzte versuchten, den Patienten zu isolieren, um die Ausbreitung der Infektion zu verhindern.
C2 noun /ˌɪrɪˈdɛsəns/

iridescence

irideszierender Glanz
Meaning
a play of lustrous, changing colors like those of a rainbow
Example
The butterfly's wings shimmered with iridescence.
Die Flügel des Schmetterlings schimmerten mit irideszierendem Glanz.
B1 noun /ɪnˈstrʌkʃənz/

instructions

Anweisungen
Meaning
Detailed information on how something should be done or operated.
Example
Please follow the instructions on the box.
Bitte folgen Sie den Anweisungen auf der Box.
B2 verb /ɪnˈdjuːs/

induce

induzieren
Meaning
to cause or persuade someone to do something; to bring about a result
Example
The doctor induced sleep with a mild sedative.
Der Arzt induzierte den Schlaf mit einem leichten Beruhigungsmittel.
C1 adjective /ˈɪntrɪkət/

intricate

komplex
Meaning
very detailed, complex, and difficult to understand
Example
The artist created an intricate pattern on the wall.
Der Künstler hat ein komplexes Muster an die Wand gemalt.
C2 adjective /ɪˈrædɪkəbəl/

irradicable

irradikabel
Meaning
not able to be eradicated; impossible to destroy or remove completely
Example
The love of a mother for her child is irradicable.
Die Liebe einer Mutter zu ihrem Kind ist irradikabel.
C2 adjective /aɪˈsɒ.krə.nəs/

isochronous

gleichzeitig auftretend
Meaning
Occurring at equal time intervals; in unison or synchrony.
Example
The pendulum swings are isochronous, repeating at equal intervals.
Die Pendelschwingungen sind isochron, wiederholen sich in gleichen Intervallen.
C1 noun /ˈɪmɪnəns/

imminence

Imminenz, Zustand der Nähe
Meaning
the state of being about to happen
Example
The imminence of the storm forced people to take shelter.
Die Imminenz des Sturms zwang die Menschen, Zuflucht zu suchen.
B1 abbreviation /ˌaɪˈiː/

ie

d.h.
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.
Viele Amphibien, d.h. Frösche und Salamander, können sowohl im Wasser als auch an Land leben.
B2 noun /ˌaɪ.səˈleɪ.ʃən/

Isolation

Isolation
Meaning
the process or fact of isolating or being isolated; separation from other people or things
Example
The patient was kept in isolation to prevent the spread of the infectious disease.
Der Patient wurde in Isolation gehalten, um die Ausbreitung der ansteckenden Krankheit zu verhindern.
C1 adjective /ɪmˈpɜːmiəbl/

impermeable

undurchlässig
Meaning
Not allowing fluid or gas to pass through.
Example
The container is made of impermeable plastic.
Der Behälter besteht aus undurchlässigem Kunststoff.
C1 noun ˌɪm.pʌlˈsɪv.ɪ.ti

impulsivity

Impulsivität
Meaning
The tendency to act quickly and without thought or care; lack of self-control.
Example
His impulsivity led him to make reckless choices.
Seine Impulsivität führte ihn dazu, unüberlegte Entscheidungen zu treffen.
C2 verb /ɪmˈbruː/

imbrue

beflecken
Meaning
To stain, especially with blood.
Example
His hands were imbrued with blood after the battle.
Seine Hände waren nach der Schlacht mit Blut befleckt.
C2 noun /ˈɪntəˌkrɒpɪŋ/

intercropping

Zwischenfruchtanbau
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.
Der Zwischenfruchtanbau kann helfen, die Bodenfruchtbarkeit und die Schädlingsbekämpfung zu verbessern.
C1 noun /ˈɪnˌmeɪt/

inmate

Insasse
Meaning
a person confined to an institution such as a prison or hospital
Example
The prison has over a thousand inmates.
Das Gefängnis hat mehr als tausend Insassen.
C1 noun /ˈɪnsɪdəns/

incidence

inzidenz
Meaning
the occurrence, rate, or frequency of something
Example
The incidence of road accidents has decreased this year.
Die Inzidenz von Straßenunfällen ist in diesem Jahr gesenkt worden.
C1 adjective /ɪnˈsɪstənt/

insistent

nachdrücklich
Meaning
demanding something firmly and refusing to accept no
Example
The child was insistent on getting a new toy.
Das Kind war nachdrücklich, ein neues Spielzeug zu bekommen.
C1 noun ˌɪndɪˈspensəbl̩ ˈkɒmpɪtənsi

indispensable competency

unverzichtbare Kompetenz
Meaning
Essential skill or ability that cannot be done without; a crucial capability that is absolutely necessary.
Example
Digital literacy is an indispensable competency in the 21st century.
Digitale Kompetenz ist eine unverzichtbare Kompetenz im 21. Jahrhundert.
C2 noun /ˈaɪ.səˌbɑːr/

isobar

Isobar
Meaning
A line on a weather map connecting points of equal atmospheric pressure.
Example
The meteorologist explained how isobars indicate wind speed and direction.
Der Meteorologe erklärte, wie Isobaren die Windgeschwindigkeit und -richtung anzeigen.
C1 adjective /ˌɪndɪˈstrʌktəbl/

indestructible

unzerstörbar
Meaning
Impossible to destroy or break.
Example
The superhero's shield was said to be indestructible.
Es wurde gesagt, dass das Schild des Superhelden unzerstörbar war.
C1 noun /ɪnˈsæn.ə.ti/

Insanity

Wahnsinn; Geisteskrankheit
Meaning
the state of being seriously mentally ill; extreme foolishness or irrationality
Example
The defense lawyer argued that his client was not guilty by reason of insanity.
Der Verteidiger argumentierte, dass sein Mandant aufgrund von Wahnsinn nicht schuldig sei.
C1 adjective /ɪˈnɜːrt/

inert

inaktiv
Meaning
lacking the ability or strength to move or act; chemically inactive
Example
The patient remained inert on the bed.
Der Patient blieb regungslos im Bett.
C1 adjective /ɪˈrɛfjʊtəbəl/

Irrefutable

unwiderlegbar
Meaning
impossible to deny or disprove; undeniable
Example
The evidence against him was irrefutable.
Der Beweis gegen ihn war unwiderlegbar.
A2 verb /ɪnˈvaɪt/

invite

einladen
Meaning
to ask someone to come to an event or to do something
Example
We should invite all our friends to the party.
Wir sollten alle unsere Freunde zur Party einladen.
C1 verb /ɪˈmɔːrtəlaɪz/

immortalize

verewigen
Meaning
to preserve the memory of someone or something forever
Example
The statue was built to immortalize the hero’s sacrifice.
Die Statue wurde gebaut, um das Opfer des Helden zu verewigen.
C2 noun /aɪər/

ire

Zorn, Wut
Meaning
intense anger or rage
Example
The new policy provoked the ire of the employees.
Die neue Politik erregte den Zorn der Mitarbeiter.
B2 noun /ˌɪn.dɪˈkeɪ.ʃən/

Indication

Indikation; Zeichen
Meaning
a sign or piece of information that indicates something; a suggestion or hint
Example
The dark clouds were a clear indication that a storm was approaching the area.
Die dunklen Wolken waren ein deutliches Zeichen dafür, dass ein Sturm sich der Gegend näherte.
C1 adjective /aɪˈdɪlɪk/

idyllic

idyllisch und schön
Meaning
Like an idyll; extremely happy, peaceful, or picturesque.
Example
They enjoyed an idyllic vacation by the sea.
Sie genossen einen idyllischen Urlaub am Meer.
A1 preposition /ɪn/

in

in
Meaning
expressing the situation of being enclosed or surrounded by something
Example
She is in the kitchen preparing dinner.
Sie ist in der Küche und bereitet das Abendessen vor.
C1 verb /ɪmˈplɔːr/

implore

bitten
Meaning
To beg someone earnestly or desperately to do something.
Example
She implored him to stay with her.
Sie bat ihn verzweifelt, bei ihr zu bleiben.
C1 adjective /ˌɪnhɒˈspɪtəbl/

inhospitable

unwirtlich
Meaning
Harsh and difficult to live in; unfriendly or unwelcoming to guests.
Example
The desert is an inhospitable environment for most plants.
Die Wüste ist ein unwirtliches Umfeld für die meisten Pflanzen.
C2 verb /ɪnˈɡrɑːft/

ingraft

verankern
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.
Der Lehrer versuchte, gute Manieren bei den Schülern zu verankern.
C1 noun /ɪnˈvɜːrʒən/

inversion

Inversion
Meaning
A reversal of the normal order, position, or relationship.
Example
In poetry, inversion is often used to create emphasis.
In der Poesie wird die Inversion oft verwendet, um Nachdruck zu verleihen.
B2 verb /ɪnˈtɛnsɪfaɪ/

intensify

intensivieren
Meaning
To make something stronger, more extreme, or more forceful.
Example
The storm is expected to intensify overnight.
Der Sturm wird voraussichtlich über Nacht intensiver werden.
B2 verb /ɪnˈʃʊər/

insure

versichern
Meaning
to provide insurance; to make certain
Example
I need to insure my new car.
Ich muss mein neues Auto versichern.
C2 verb /ɪnˈdɛmnɪfaɪ/

indemnify

entschädigen
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.
Die Versicherungsgesellschaft stimmte zu, den Kunden für die Schäden zu entschädigen.
C2 adjective /ɪmˈpæsɪbəl/

impassible

unempfindlich
Meaning
Incapable of suffering or feeling pain (used mainly in theological or philosophical contexts).
Example
Some philosophers argue that God is impassible and cannot experience human emotions.
Einige Philosophen argumentieren, dass Gott unempfindlich ist und keine menschlichen Emotionen erfahren kann.
B2 verb /ˌɪntərˈviːn/

intervene

eingreifen
Meaning
To come between people, groups, or events, often to prevent conflict or improve a situation.
Example
The teacher had to intervene to stop the fight between the students.
Der Lehrer musste eingreifen, um den Kampf zwischen den Schülern zu stoppen.
B1 noun /ˈɪnkʌm/

income

einkommen
Meaning
money received for work or through investments
Example
His monthly income is enough to support his family.
Sein monatliches Einkommen reicht aus, um seine Familie zu unterstützen.
C2 adjective /ɪmˈpræktɪkəbl/

impracticable

unpraktisch
Meaning
Not capable of being carried out or put into practice.
Example
The plan seemed impracticable due to limited resources.
Der Plan schien aufgrund begrenzter Ressourcen unpraktisch zu sein.
C2 adjective /ɪnˈkoʊətɪv/

inchoative

incipient
Meaning
relating to the beginning of something; in an initial stage
Example
The poet used inchoative expressions to depict the dawn of creation.
Der Dichter benutzte inchoative Ausdrücke, um den Beginn der Schöpfung darzustellen.
C2 noun /ɪnˈtræn.sɪ.dʒəns/

intransigence

Unnachgiebigkeit
Meaning
Refusal to change one's views or to agree about something.
Example
The negotiations failed due to the intransigence of both parties.
Die Verhandlungen scheiterten aufgrund der Unnachgiebigkeit beider Parteien.
B2 adjective ɪnˈev.ɪ.tə.bəl

inevitable

unvermeidlich
Meaning
Certain to happen; unavoidable.
Example
Death is an inevitable part of life.
Der Tod ist ein unvermeidlicher Teil des Lebens.
B1 adjective /ˈɪrɪteɪtɪŋ/

irritating

reizend
Meaning
causing annoyance, impatience, or mild anger
Example
The constant noise from the street is extremely irritating.
Der ständige Lärm von der Straße ist extrem reizend.
C2 adjective /ˌaɪsəʊˈθɜːrməl/

isothermal

isotherm
Meaning
Having or maintaining equal or constant temperature.
Example
The experiment was conducted under isothermal conditions.
Das Experiment wurde unter isothermen Bedingungen durchgeführt.
C2 adjective /ɪˈnɪkwɪtəs/

iniquitous

ungerechts
Meaning
grossly unfair and morally wrong
Example
Slavery was one of the most iniquitous practices in history.
Sklaverei war eine der ungerechtesten Praktiken in der Geschichte.
C2 noun /ˈaɪdɪl/

idyll

idyllische Szene
Meaning
An extremely happy, peaceful, or picturesque episode or scene, often idealized.
Example
Their honeymoon was an idyll on a tropical island.
Ihre Hochzeitsreise war eine idyllische Szene auf einer tropischen Insel.
B2 adjective /ɪnˈfekʃəs/

infectious

ansteckend
Meaning
capable of causing infection or disease; spreading easily from one person to another; able to spread feelings or attitudes such as enthusiasm
Example
Her infectious laughter made everyone in the room smile.
Ihr ansteckendes Lachen brachte alle zum Lächeln.
B2 noun /ɪnˈkluːʒən/

inclusion

Inklusion
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.
Vielfalt und Inklusion sind wichtige Werte in modernen Arbeitsplätzen.
B2 adjective /ɪˈmætʃʊr/

Immature

unreif; nicht vollständig entwickelt; kindlich
Meaning
not fully developed; lacking emotional or intellectual development; childish
Example
His immature behavior during the meeting disappointed everyone.
Sein unreifes Verhalten während des Treffens enttäuschte alle.
C1 adjective /ˌɪndɪˈvɪzəbl/

indivisible

unteilbar
Meaning
Not able to be divided or separated.
Example
The country's unity was indivisible despite differences.
Die Einheit des Landes war trotz der Unterschiede unteilbar.
A2 noun /ˈaɪtəm/

item

Artikel
Meaning
A single thing, object, or unit, often part of a list or collection.
Example
Each item on the list must be checked carefully.
Jeder Artikel auf der Liste muss sorgfältig überprüft werden.
C1 noun /ɪnˈhɛrɪtər/

inheritor

Erbe
Meaning
a person who receives money, property, or a title when someone dies
Example
She became the inheritor of her family's estate.
Sie wurde die Erbin des Familienvermögens.
B2 noun ˈɪnər strɛŋkθ

inner strength

innere Stärke
Meaning
Mental or spiritual power that helps a person cope with difficulties.
Example
Community service fosters inner strength in individuals.
Gemeinnützige Arbeit fördert die innere Stärke in Einzelpersonen.
C1 adjective /ˌɪntərˈtʃeɪndʒəbl/

interchangeable

austauschbar
Meaning
able to be exchanged with each other without difference or loss of function
Example
These machine parts are interchangeable, so they can be replaced easily.
Diese Maschinenteile sind austauschbar, so dass sie einfach ersetzt werden können.
C2 noun /ɪnˈsɪɡniə/

insignia

Abzeichen
Meaning
A badge or symbol that shows rank, position, or membership.
Example
The soldier proudly wore the insignia of his regiment.
Der Soldat trug stolz das Abzeichen seines Regiments.
C1 adjective /ɪnˈsɪdiəs/

insidious

heimtückisch
Meaning
Proceeding in a gradual, subtle way but with harmful effects.
Example
The insidious spread of misinformation can damage trust.
Die heimtückische Verbreitung von Fehlinformationen kann das Vertrauen schädigen.
C1 noun /ˌɪndɪˈdʒɛstʃən/

indigestion

Verdauungsstörung
Meaning
Discomfort or pain in the stomach associated with difficulty in digesting food.
Example
He avoided spicy food because it often gave him indigestion.
Er vermied scharfes Essen, weil es ihm oft Verdauungsstörungen verursachte.
C1 adjective ˌɪn.trəˈspek.tɪv

introspective

introspektiv
Meaning
Characterized by or given to introspection; examining one's own thoughts and feelings.
Example
Writers tend to be highly introspective individuals.
Schriftsteller neigen dazu, hochgradig introspektive Individuen zu sein.
A2 verb /ɪmˈpruːv/

improve

verbessern
Meaning
to make or become better; to enhance quality or condition
Example
Practice helps improve your skills.
Übung hilft, Ihre Fähigkeiten zu verbessern.
A1 preposition/adverb/adjective/noun /ˌɪnˈsaɪd/

inside

Glück
Meaning
Situated within something; the inner part of something.
Example
She waited inside the house until the rain stopped.
Sie konnte ihr Glück nicht verbergen, als sie den Preis erhielt.
C1 adjective /ɪnˈdiːsənt/

indecent

unanständig
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.
Er wurde wegen einer unanständigen Bemerkung verwarnt.
B2 adjective /ˌɪnsəˈfɪʃənt/

insufficient

unzureichend
Meaning
Not enough; inadequate.
Example
His explanation was insufficient to clear the confusion.
Seine Erklärung war unzureichend, um die Verwirrung zu klären.
A2 noun /ˌɪn.trəˈdʌk.ʃən/

introduction

Einführung
Meaning
the action of introducing something or someone; an opening or beginning part
Example
The professor gave a brief introduction before starting the lecture.
Der Professor gab eine kurze Einführung, bevor er die Vorlesung begann.
C1 noun/verb /ˈɪnsɛns/

incense

Weihrauch / erzürnen
Meaning
a substance burned for its sweet smell (noun); to make very angry (verb)
Example
The smell of incense filled the temple, but his rude words incensed her.
Der Duft von Weihrauch füllte den Tempel, aber seine unhöflichen Worte erzürnten sie.
C2 adjective /ˌɪməˈmɔːriəl/

immemorial

unermesslich
Meaning
Extending back beyond memory or record; ancient.
Example
The tradition has been followed since time immemorial.
Die Tradition wird seit unermesslichen Zeiten befolgt.
C1 noun /ˌɪnɪkˈspɪəriəns/

inexperience

Unerfahrenheit
Meaning
Lack of knowledge or skill in a particular activity or field.
Example
His inexperience in handling negotiations was evident.
Seine Unerfahrenheit im Umgang mit Verhandlungen war offensichtlich.
C1 adjective /ɪˈluː.sɪv/

Illusive

trügerisch; scheinbar existierend, aber nicht real; täuschend
Meaning
deceptive; appearing to exist but not real; misleading
Example
The promise of easy money proved to be illusive and misleading.
Das Versprechen von leichtem Geld erwies sich als trügerisch und täuschend.
C1 noun /ɪnˈtɛstɪn/

intestine

Darm
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.
Der Arzt erklärte, wie Nährstoffe im Dünndarm aufgenommen werden.
C1 verb /ɪmˈpiːd/

impede

behindern
Meaning
To obstruct or hinder the progress or development of something.
Example
Lack of funds can impede business growth.
Mangel an Mitteln kann das Wachstum von Unternehmen behindern.
C1 noun ˈɪm.pɪ.təs

impetus

Antrieb
Meaning
The force or motivation that drives something forward; momentum.
Example
The new policy provided an impetus for economic growth.
Die neue Politik gab einen Antrieb für das wirtschaftliche Wachstum.
C1 noun /ɪnˈækjʊrəsi/

inaccuracy

Ungenauigkeit
Meaning
lack of accuracy or precision; an incorrect or wrong detail
Example
The report contained several factual inaccuracies.
Der Bericht enthielt mehrere Ungenauigkeiten.
C2 verb /ɪnˈdɒktrɪˌneɪt/

indoctrinate

indoktrinieren
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.
Das Regime versuchte, die Jugend mit Propaganda zu indoktrinieren.
C2 adjective /ɪnˈkoʊ.ɪt/ or /ɪnˈkoʊ.eɪt/

inchoate

unvollständig
Meaning
Just begun and not fully formed; rudimentary.
Example
His inchoate ideas needed more research to be developed.
Seine unvollständigen Ideen benötigten mehr Forschung, um weiterentwickelt zu werden.
C1 verb /ɪmˈpɛl/

impel

bewegen
Meaning
to drive, force, or urge someone to do something
Example
Her curiosity impelled her to open the mysterious box.
Ihre Neugier trieb sie dazu, die mysteriöse Kiste zu öffnen.
C1 verb /ˈaɪdəlaɪz/

idolize

verehren
Meaning
To admire or worship someone excessively.
Example
Fans often idolize celebrities for their talent and lifestyle.
Fans verehren oft Prominente für ihr Talent und ihren Lebensstil.
C1 noun /ɪˌreɡjəˈlærɪti/

irregularity

Unregelmäßigkeit
Meaning
lack of regularity or consistency; a deviation from what is normal, expected, or orderly
Example
The audit revealed several financial irregularities in the company’s records.
Die Prüfung deckte mehrere finanzielle Unregelmäßigkeiten in den Unterlagen des Unternehmens auf.
C1 verb /ˌɪnstɪˈtjuːʃənəlaɪz/

institutionalize

institutionalisieren
Meaning
to establish something as a formal institution, custom, or practice
Example
The government seeks to institutionalize environmental protection.
Die Regierung strebt danach, den Umweltschutz zu institutionalisieren.
C2 adjective /ˌɪrɪˈdjuːsəbl/

irreducible

unzerlegbar
Meaning
impossible to reduce or simplify further
Example
The fraction 3/7 is irreducible.
Der Bruch 3/7 ist unzerlegbar.
C2 adjective /ˌɪn.ɪˈlʌk.tə.bəl/

ineluctable

unvermeidlich
Meaning
Impossible to avoid or escape; inevitable.
Example
Death is an ineluctable part of human existence.
Der Tod ist ein unvermeidlicher Bestandteil der menschlichen Existenz.
C1 adjective /ɪnˈsʌf.ər.ə.bəl/

insufferable

unerträglich
Meaning
Too extreme to bear; intolerable.
Example
The heat during the summer was insufferable.
Die Hitze im Sommer war unerträglich.
B2 noun /ˈɪdɪət/

idiot

Idiot
Meaning
a person who acts in a way that is considered very stupid or foolish
Example
He acted like an idiot at the party last night.
Er benahm sich wie ein Idiot auf der Party letzte Nacht.
C2 noun /ˌɪkθiˈɒlədʒi/

ichthyology

Ichthyologie
Meaning
The branch of zoology that deals with fish.
Example
He pursued a degree in ichthyology at the university.
Er hat an der Universität einen Abschluss in Ichthyologie gemacht.
C1 verb /ˈɪrɪˌɡeɪt/

irrigate

bewässern
Meaning
to supply water to land or crops; to wash out a wound with water
Example
Farmers irrigate their fields during dry seasons.
Bauern bewässern ihre Felder in der Trockenzeit.
B2 noun /ɪnˈtɛnt/

intent

Absicht
Meaning
the purpose or reason behind an action; a strong determination to do something
Example
Her intent was to improve the quality of education in the community.
Ihre Absicht war es, die Qualität der Bildung in der Gemeinschaft zu verbessern.
C1 noun /ˈɪd.i.əm/

idiom

Idiom
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.
Das Idiom 'Eis brechen' bedeutet, ein Gespräch auf freundliche Weise zu beginnen.
A2 adjective ˌɪn.təˈnæʃ.ən.əl

international

international
Meaning
Existing, occurring, or carried on between two or more nations and their citizens.
Example
International standards improve competitiveness.
Internationale Standards verbessern die Wettbewerbsfähigkeit.
C2 noun /ɪnˈtɛɡ.jʊ.mənt/

integument

äußere Hülle
Meaning
A natural outer covering, such as skin, shell, or rind.
Example
The snake sheds its integument as it grows.
Die Schlange verliert ihre äußere Hülle, wenn sie wächst.
C2 adjective /ɪnˈvʌlnərəbl/

invulnerable

unverwundbar
Meaning
Impossible to harm, damage, or defeat.
Example
The fortress was thought to be invulnerable to attack.
Die Festung galt als unverwundbar gegenüber Angriffen.
C1 verb /ɪˈnɔːɡjʊreɪt/

inaugurate

einweihen
Meaning
To formally begin or introduce something, especially with a ceremony.
Example
The mayor will inaugurate the new bridge tomorrow.
Der Bürgermeister wird morgen die neue Brücke einweihen.
C1 noun /ˈɪntərˌpleɪ/

interplay

Wechselwirkung
Meaning
The way in which two or more things have an effect on each other.
Example
The interplay between culture and technology shapes modern life.
Die Wechselwirkung zwischen Kultur und Technologie prägt das moderne Leben.
C1 adjective /ɪˈnɛpt/

inept

ungeschickt
Meaning
lacking skill or ability; clumsy or incompetent
Example
His inept handling of the situation made it worse.
Sein ungeschicktes Handling der Situation machte sie schlimmer.
C2 adjective /ɪnˈɡreɪʃiˌeɪtɪŋ/

ingratiating

schmeichelhaft
Meaning
Charming or flattering in a way intended to gain favor.
Example
His ingratiating smile made everyone trust him quickly.
Sein schmeichelhaftes Lächeln brachte alle dazu, ihm schnell zu vertrauen.
C1 adjective /ˈɜːrksəm/

irksome

ärgerlich
Meaning
annoying or irritating
Example
Waiting in a long line is one of the most irksome tasks.
In einer langen Schlange zu warten ist eine der ärgerlichsten Aufgaben.
C2 verb /ɜːrk/

irk

ärgern
Meaning
to annoy or irritate someone
Example
It irks me when people are late without calling.
Es ärgert mich, wenn Leute ohne anzurufen zu spät kommen.
C1 verb /ɪɡˈnaɪt/

ignite

entzünden
Meaning
To catch fire or cause to catch fire; to start or arouse.
Example
The sparks ignited the dry leaves in seconds.
Die Funken entzündeten die trockenen Blätter in Sekunden.
C2 adjective /ɪnˈæpt/

Inapt

ungeeignet; unpassend
Meaning
not suitable; inappropriate; unfit
Example
His comment was inapt for the formal meeting.
Sein Kommentar war für das formelle Meeting unpassend.
C2 noun /ɪnˈtɛnʃən/

intension

innere Bedeutung
Meaning
The internal content of a concept; the set of attributes implied by a word or phrase.
Example
The intension of the word 'dog' includes being a mammal and domesticated.
Die Intension des Wortes 'Hund' umfasst, ein Säugetier und domestiziert zu sein.
C2 adjective /ɪɡˈnoʊ.bəl/

Ignoble

ehrenlos; niederträchtig; gemein
Meaning
dishonorable; not noble in character; base or mean
Example
His ignoble actions betrayed his friends' trust.
Seine ehrenlosen Taten verrieten das Vertrauen seiner Freunde.
C1 verb /ɪnˈklaɪn/

incline

neigen
Meaning
to feel willing or favorably disposed toward something; to bend or tilt
Example
She is inclined to agree with the proposal.
Sie ist geneigt, dem Vorschlag zuzustimmen.
C1 adjective /ˈɪnərmoʊst/

Innermost

am tiefsten; persönlichster
Meaning
most private and secret; deepest; most personal
Example
She shared her innermost feelings with her closest friend.
Sie teilte ihre tiefsten Gefühle mit ihrem engsten Freund.
C1 adjective ɪnɪɡˈzɔːstɪbəl

inexhaustible

unerschöpflich
Meaning
Unable to be used up or worn out; limitless.
Example
His inexhaustible energy allowed him to work tirelessly on his projects.
Seine unerschöpfliche Energie ermöglichte es ihm, unermüdlich an seinen Projekten zu arbeiten.
C1 adjective /ɪnˈɛlɪdʒəbəl/

Ineligible

ineligibel; nicht qualifiziert; ungeeignet
Meaning
not qualified or entitled to participate or be chosen; unsuitable
Example
Students with poor grades are ineligible for the scholarship program.
Studenten mit schlechten Noten sind für das Stipendienprogramm nicht qualifiziert.
C1 adjective /ˌɪnədˈmɪsəbl̩/

inadmissible

unzulässig
Meaning
Not allowed, especially as evidence in a court of law.
Example
The judge ruled the evidence inadmissible.
Der Richter erklärte das Beweismaterial für unzulässig.
B2 noun /ˌɪntəˈrʌpʃən/

interruption

Unterbrechung
Meaning
the act of stopping or breaking the continuity of something; a pause caused by an external action
Example
The meeting was delayed due to an unexpected interruption.
Das Treffen wurde wegen einer unerwarteten Unterbrechung verschoben.
B2 noun ɪˈlɪtərəsi

illiteracy

Illiteralismus
Meaning
The inability to read and write; lack of education or knowledge in a particular area.
Example
Illiteracy often leads to poverty and unemployment.
Illiteralismus führt oft zu Armut und Arbeitslosigkeit.
C2 noun /ˈænʒənuː/

ingenue

unschuldige junge Frau
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.
Sie spielte die Rolle der unschuldigen jungen Frau im Stück mit viel Charme.