impossibility
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C1 noun /ɪmˌpɒsəˈbɪlɪti/

impossibility

Unmöglichkeit
Meaning
the state or fact of being impossible; something that cannot be done or achieved
Example
Finishing the project in one day was an impossibility.
Das Projekt an einem Tag zu beenden war eine Unmöglichkeit.
C1 noun /ɪmˈpɒs.tər/

Impostor

Betrüger; Hochstapler
Meaning
a person who pretends to be someone else in order to deceive others; a fraud
Example
The impostor convinced everyone he was a doctor until his fake credentials were discovered.
Der Imposter überzeugte alle, dass er ein Arzt war, bis seine falschen Qualifikationen entdeckt wurden.
C1 adjective /ˌɪn.səbˈstæn.ʃəl/

insubstantial

unwesentlich
Meaning
Lacking strength, substance, or solidity.
Example
The evidence provided was insubstantial and unconvincing.
Die bereitgestellten Beweise waren unwesentlich und wenig überzeugend.
C1 verb /ɪnˈvɪɡ.ər.eɪt/

invigorate

beleben
Meaning
To give strength or energy to someone or something.
Example
A morning walk can invigorate both body and mind.
Ein morgendlicher Spaziergang kann Körper und Geist beleben.
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.
C1 noun ˌɪnfrəˈstrʌktʃərəl dɪˈveləpmənt

infrastructural development

infrastrukturelle Entwicklung
Meaning
The process of building and improving the basic physical and organizational structures and facilities needed for the operation of a society or enterprise.
Example
Infrastructural development is necessary for efficient recycling.
Infrastrukturelle Entwicklung ist notwendig für effizientes Recycling.
C1 verb /ɪnˈterəˌɡeɪt/

interrogate

verhören
Meaning
to ask someone questions in a thorough and formal way; to question intensively
Example
The police interrogated the suspect for hours.
Die Polizei hat den Verdächtigen stundenlang verhört.
C1 noun /ɪˌluːmɪˈneɪʃən/

illumination

Beleuchtung
Meaning
the act of lighting something or making something clear
Example
The street was filled with bright illumination from the lamps.
Die Straße war durch die Lampen von hellem Licht erfüllt.
C1 adjective /ˌɪrɪˈprɛsəbl̩/

irrepressible

unaufhaltsam
Meaning
Impossible to control or restrain.
Example
She had an irrepressible urge to laugh during the speech.
Sie konnte ihre unaufhaltsame Lust zu lachen während der Rede nicht verbergen.
C1 adjective /ɪˈledʒ.ə.bəl/

illegible

unleserlich
Meaning
Not clear enough to be read; unreadable.
Example
The doctor’s handwriting was almost illegible.
Die Handschrift des Arztes war fast unleserlich.
C1 noun /ˌɪndɪɡˈneɪʃən/

indignation

Empörung
Meaning
Strong displeasure or anger caused by something unjust, offensive, or insulting.
Example
Public indignation grew after the unfair verdict.
Öffentliche Empörung wuchs nach dem ungerechten Urteil.
C1 noun /ˌɪn.trəˈvɜːr.ʒən/

introversion

Introversion
Meaning
The tendency to be inward-looking and shy, preferring solitary activities.
Example
Her introversion made it difficult for her to enjoy large parties.
Ihre Introversion machte es ihr schwer, große Partys zu genießen.
C1 noun /ˌɪmpɔːrˈteɪʃən/

importation

Import
Meaning
The act of bringing goods or services into a country from abroad
Example
The importation of luxury goods is strictly regulated.
Die Import von Luxusgütern ist streng reguliert.
C1 adjective /ɪnˈtɒl.ər.ə.bəl/

Intolerable

unerträglich
Meaning
unable to be endured; extremely unpleasant or painful
Example
The noise from the construction site was intolerable.
Der Lärm von der Baustelle war unerträglich.
C1 noun /ˌaɪ.diˈɒl.ə.dʒi/

ideology

Ideologie
Meaning
A system of ideas and ideals, especially one that forms the basis of economic or political theory and policy.
Example
Democracy is based on the ideology of freedom and equality.
Demokratie basiert auf der Ideologie von Freiheit und Gleichheit.
C1 adjective /ˌɪnədˈvɜːrtənt/

inadvertent

unbeabsichtigt, unbeabsichtigt
Meaning
Not resulting from or achieved through deliberate planning; unintentional.
Example
Her inadvertent mistake caused a delay in the project.
Ihr unbeabsichtigter Fehler verursachte eine Verzögerung im Projekt.
C1 noun ɪˌræʃ.ənˈæl.ɪ.ti

irrationality

Irrationalität, Unvernunft, Unlogik
Meaning
The quality of being illogical or unreasonable; lack of rational thought.
Example
His decision was driven by complete irrationality.
Seine Entscheidung war von völliger Irrationalität getrieben.
C1 noun /ˌɪntɪˈmeɪʃən/

intimation

Andeutung
Meaning
A subtle or indirect hint or suggestion.
Example
She gave no intimation of her plans.
Sie gab keinen Hinweis auf ihre Pläne.
C1 verb /ɪnˈsɪnjueɪt/

insinuate

insinuieren
Meaning
To suggest or hint something indirectly and often unpleasantly.
Example
He insinuated that she had lied about her qualifications.
Er insinuierte, dass sie über ihre Qualifikationen gelogen hatte.
C1 adverb /ˌɪn.dɪˈskrɪm.ɪ.nət.li/

Indiscriminately

indiskriminierend
Meaning
without making careful distinctions; randomly; without discrimination
Example
The company fired employees indiscriminately without considering their performance.
Das Unternehmen entließ die Mitarbeiter ohne Rücksicht auf ihre Leistung.
C1 adjective /ɪmˈpɜːrtɪnənt/

impertinent

unverschämt
Meaning
rude and showing a lack of respect
Example
It was impertinent of him to question the manager's decision.
Es war unverschämt von ihm, die Entscheidung des Managers zu hinterfragen.
C1 adjective /ˌɪnɑːrˈtɪkjʊlət/

inarticulate

unverständlich
Meaning
Unable to express oneself clearly or effectively in speech or writing.
Example
She became inarticulate with emotion during the speech.
Sie wurde beim Vortrag vor Emotionen unverständlich.
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.
C1 noun /ˌɪnkoʊˈhɪrəns/

incoherence

Inkohärenz
Meaning
The quality of being unclear, confused, or lacking logical connection.
Example
His speech was full of incoherence and difficult to follow.
Seine Rede war voller Inkohärenz und schwer zu folgen.
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 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 /ɪnˈstɪŋk.tɪv/

instinctive

instinktiv, natürlich, automatisch
Meaning
Based on instinct; done without conscious thought; natural and automatic.
Example
His instinctive reaction saved his life.
Seine instinktive Reaktion rettete sein Leben.
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.
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 /ɪnˈdem.nə.ti/

Indemnity

Entschädigung
Meaning
security or protection against a loss or other financial burden; compensation for damage or loss
Example
The insurance company provided full indemnity for the damages caused by the flood.
Die Versicherungsgesellschaft stellte vollständige Entschädigung für die durch die Flut verursachten Schäden bereit.
C1 noun /ɪnˌkɑːsəˈreɪʃən/

incarceration

Inhaftierung
Meaning
the state of being imprisoned or confined
Example
The criminal faced years of incarceration for his crimes.
Der Kriminelle verbrachte Jahre der Inhaftierung für seine Verbrechen.
C1 adjective, noun /ɪnˈdɪkətɪv/

indicative

indikativ
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.
Sein Ton war indikativ für seine Frustration.
C1 adjective /ˌɪnɔːrˈɡænɪk/

inorganic

anorganisch
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.
Anorganische Verbindungen sind wichtig in der Chemie.
C1 adjective /ɪnˈtrɛpɪd/

intrepid

unerschrocken
Meaning
fearless and adventurous, often used humorously
Example
The intrepid traveler explored the jungle alone.
Der unerschrockene Reisende erkundete den Dschungel alleine.
C1 adjective /ˈɪnsjələr/

insular

engstirnig, inselbezogen
Meaning
Narrow-minded, isolated, or relating to an island.
Example
The community was criticized for its insular attitudes toward outsiders.
Die Gemeinschaft wurde für ihre insularen Einstellungen gegenüber Außenseitern kritisiert.
C1 noun ɪnˈsɒl.vən.si

insolvency

Insolvenz
Meaning
The state of being unable to pay debts owed; bankruptcy.
Example
The company declared insolvency after years of losses.
Das Unternehmen erklärte nach Jahren der Verluste Insolvenz.
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.
C1 adjective /ˌɪlɪˈdʒɪtɪmət/

illegitimate

illegitim
Meaning
Not authorized by law, rules, or standards; not recognized as valid.
Example
The court ruled the contract to be illegitimate.
Das Gericht entschied, dass der Vertrag illegitim war.
C1 noun /ˈɪn.trə.vɜːrt/

introvert

introvertiert
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.
Als Introvertierter bevorzugte er es, zu lesen, anstatt zu Partys zu gehen.
C1 verb /ɪmˈploʊd/

implode

implodieren
Meaning
To collapse or burst inward violently.
Example
The old building imploded during the demolition.
Das alte Gebäude implodierte während der Abrissarbeiten.
C1 adjective /ɪmˈpɜːrsənl/

impersonal

unpersönlich
Meaning
not influenced by, showing, or involving personal feelings; lacking human warmth or emotion
Example
The letter was written in a very impersonal style.
Der Brief wurde in einem sehr unpersönlichen Stil geschrieben.
C1 verb /ɪnˈvælɪdeɪt/

invalidate

ungültig machen
Meaning
To make something not valid or legally acceptable.
Example
The new evidence may invalidate the previous ruling.
Die neuen Beweise könnten das vorherige Urteil ungültig machen.
C1 adjective /ɪmˈpɛndɪŋ/

impending

bevorstehend
Meaning
about to happen soon, usually something unpleasant or threatening
Example
The villagers were worried about the impending flood.
Die Dorfbewohner waren besorgt über die bevorstehende Flut.
C1 adjective /ˌɪnɪkˈskjuːzəbl/

inexcusable

unentschuldbar
Meaning
Too bad to be justified or overlooked; unforgivable.
Example
His rude behavior was inexcusable.
Sein unhöfliches Verhalten war unentschuldbar.
C1 noun ˌɪnsjʊˈleɪʃən

insulation

Isolierung
Meaning
Material used to prevent heat, sound, or electricity from being transmitted from one area to another.
Example
Insulation of food storage areas can prevent pests from entering.
Die Isolierung von Lebensmittel-Lagerbereichen kann verhindern, dass Schädlinge eindringen.
C1 adjective /ˌɪnkəʊˈhɪərənt/

incoherent

inkohärent
Meaning
Not clear or easy to understand; lacking logical connection.
Example
His explanation was so incoherent that nobody could follow it.
Seine Erklärung war so inkohärent, dass niemand ihr folgen konnte.
C1 verb /ɪmˈpɑːrt/

impart

vermitteln
Meaning
to make information known; to bestow or communicate
Example
The teacher imparted valuable knowledge to her students.
Der Lehrer vermittelte wertvolles Wissen an seine Schüler.
C1 adjective /ˌɪnkənˈsiːvəbl̩/

inconceivable

unvorstellbar
Meaning
Impossible to imagine or believe; beyond comprehension.
Example
It seemed inconceivable that she could finish the marathon after such little training.
Es schien unvorstellbar, dass sie den Marathon nach so wenig Training beenden könnte.
C1 noun /ˈɪtʃ.i.nəs/

itchiness

Juckreiz
Meaning
The quality or condition of feeling an irritating sensation on the skin that causes a desire to scratch.
Example
Eye itchiness often leads to rubbing.
Augenjuckreiz führt oft zum Reiben.
C1 verb /ɪnˈskraɪb/

inscribe

einritzen
Meaning
to write or carve words or symbols on a surface
Example
They inscribed her name on the trophy.
Sie haben ihren Namen auf dem Pokal eingraviert.
C1 adjective /ɪnˈɔːdəbl/

inaudible

unhörbar
Meaning
Unable to be heard.
Example
Her voice was almost inaudible over the noise.
Ihre Stimme war fast unhörbar über dem Lärm.
C1 adjective /ɪˈmuː.və.bəl/

immovable

unbeweglich
Meaning
Not able to be moved; fixed in position.
Example
Immovable barriers prevent change.
Unbewegliche Barrieren verhindern Veränderungen.
C1 adjective /ˌɪnɪkˈsplɪkəbl/

inexplicable

unverständlich
Meaning
Impossible to explain or understand.
Example
The sudden disappearance of the file was inexplicable.
Das plötzliche Verschwinden der Datei war unverständlich.
C1 verb /ˈɪtəreɪt/

iterate

iterieren
Meaning
To repeat a process or statement, often to improve or refine.
Example
The software team will iterate the design until it meets user needs.
Das Softwareteam wird das Design iterieren, bis es den Benutzeranforderungen entspricht.
C1 adjective ˌɪdiəsɪnˈkrætɪk

idiosyncratic

eigenartig und individuell
Meaning
Relating to idiosyncrasy; peculiar or individual.
Example
His idiosyncratic behavior set him apart from his colleagues.
Sein idiosynkratisches Verhalten unterschied ihn von seinen Kollegen.
C1 adjective /ˌɪrɪˈspɛktɪv/

Irrespective

unabhängig; ohne Berücksichtigung
Meaning
without taking something into account; regardless of
Example
All students will be treated equally, irrespective of their background.
Alle Studenten werden gleich behandelt, unabhängig von ihrem Hintergrund.
C1 verb /ɪnˈtɪmɪdeɪt/

intimidate

einschüchtern
Meaning
To frighten or overawe someone, especially to make them do what one wants.
Example
The bully tried to intimidate the smaller kids.
Der Tyrann versuchte, die kleineren Kinder einzuschüchtern.
C1 noun /ɪmˈpɛdɪmənt/

impediments

Hindernisse
Meaning
A hindrance or obstruction in doing something; things that prevent progress or achievement.
Example
Economic impediments often hinder social development.
Wirtschaftliche Hindernisse behindern oft die soziale Entwicklung.
C1 noun /ˌɪnflɛksɪˈbɪlɪti/

inflexibility

Unflexibilität
Meaning
the quality of being rigid or unwilling to change; lack of adaptability
Example
The inflexibility of the rules caused unnecessary delays.
Die Unflexibilität der Regeln verursachte unnötige Verzögerungen.
C1 adjective /ˌɪməˈtɪəriəl/

immaterial

unwichtig
Meaning
Not important or relevant; lacking physical substance.
Example
The judge ruled that the argument was immaterial to the case.
Der Richter entschied, dass das Argument für den Fall unerheblich war.
C1 adjective /ɪnˈkwɪzɪtɪv/

inquisitive

neugierig
Meaning
Curious or eager to learn and ask questions.
Example
The inquisitive child asked endless questions about the stars.
Das neugierige Kind stellte unzählige Fragen über die Sterne.
C1 verb ɪˈmɜːrs

immerse

eintauchen
Meaning
To involve oneself deeply in a particular activity or interest; to surround completely.
Example
Immerse yourself in the new language.
Tauche in die neue Sprache ein.
C1 adjective /ɪnˈvɑːlənˌtɛri/

involuntary

unfreiwillig
Meaning
done without will or conscious control
Example
He gave an involuntary shiver when he heard the loud noise.
Er bekam einen unwillkürlichen Schauer, als er das laute Geräusch hörte.
C1 adjective ɪnˈsaɪ.sɪv

incisive

scharfsinnig
Meaning
Intelligently analytical and clear-thinking; showing clear thought and good understanding of what is important.
Example
His incisive comments revealed the core issues.
Seine scharfsinnigen Kommentare enthüllten die Kernprobleme.
C1 adjective /ˌɪndɪˈspjuːtəbəl/

Indisputable

unbestreitbar; unbestreitbar; sicher
Meaning
impossible to deny or argue against; undeniable; certain
Example
The evidence against him was indisputable.
Die Beweise gegen ihn waren unbestreitbar.
C1 noun /ˈɪŋ.krə.mənt/

Increment

Erhöhung
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.
Er erhielt in diesem Jahr eine jährliche Erhöhung von fünf Prozent seines Gehalts.
C1 verb /ɪnˈsaɪt/

incite

anstacheln
Meaning
to provoke; to stir up
Example
His speech incited the crowd to violence.
Seine Rede hat die Menge zu Gewalt angestachelt.
C1 adjective /ɪnˈdefɪnət/

Indefinite

unbestimmt
Meaning
not clearly defined; uncertain; vague; unlimited in time
Example
The meeting has been postponed for an indefinite period.
Das Treffen wurde auf einen unbestimmten Zeitraum verschoben.
C1 adjective /ˌɪnkənˈsɪdərət/

inconsiderate

rücksichtslos
Meaning
Thoughtless; showing a lack of concern for others.
Example
It was inconsiderate of him to play loud music late at night.
Es war rücksichtslos von ihm, nachts laute Musik zu spielen.
C1 adjective ɪnˈkʌm.bənt

incumbent

verpflichtend
Meaning
necessary for (someone) as a duty or responsibility.
Example
It is incumbent upon all citizens to obey the law.
Es ist für alle Bürger verpflichtend, das Gesetz zu befolgen.
C1 noun /ɪmˈbæl.əns/

Imbalance

Ungleichgewicht
Meaning
lack of proportion or relation between corresponding things; unequal distribution
Example
The doctor said the patient's dizziness was caused by an inner ear imbalance.
Der Arzt sagte, dass die Schwindelgefühle des Patienten durch ein Ungleichgewicht im Innenohr verursacht wurden.
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 noun /ˌɪnklɪˈneɪʃən/

inclination

Neigung
Meaning
A natural tendency or urge to act or feel in a particular way.
Example
She has an inclination towards helping others.
Sie hat eine Neigung, anderen zu helfen.
C1 adjective ˌɪn.krəˈmen.təl

incremental

inkrementell
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.
Inkrementelle Veränderungen gewährleisten Nachhaltigkeit.
C1 noun ɪnˈdʌldʒəns

indulgence

Genuss
Meaning
The practice of allowing oneself to enjoy the pleasure of something.
Example
His indulgence in junk food affected his health.
Sein Genuss von Junk-Food beeinträchtigte seine Gesundheit.
C1 adjective /ɪnˈɡreɪnd/

ingrained

eingewurzelt
Meaning
Firmly fixed or established; deeply rooted and difficult to change.
Example
His ingrained habits were hard to break.
Seine eingewurzelten Gewohnheiten waren schwer zu brechen.
C1 adjective /ˌaɪdiəˈlɪstɪk/

Idealistic

idealistisch
Meaning
pursuing high principles or ideals; unrealistically optimistic
Example
She has an idealistic view of changing the world.
Sie hat eine idealistische Sicht darauf, die Welt zu verändern.
C1 noun /ˌɪntərˈmɪʃən/

intermission

Pause
Meaning
A pause or break, especially during a performance or event.
Example
The play had a twenty-minute intermission.
Das Stück hatte eine zwanzigminütige Pause.
C1 adjective ɪˈneɪt

Innate

angeboren oder natürlich
Meaning
Existing from birth or natural
Example
She has an innate talent for music.
Sie hat ein angeborenes Talent für Musik.
C1 adjective /ˌɪnstənˈteɪniəs/

instantaneous

sofortig
Meaning
Happening immediately, without any delay.
Example
The change in temperature was almost instantaneous.
Die Temperaturänderung war fast sofortig.
C1 noun /ɪmˈpɜː.mə.nəns/

impermanence

Vergänglichkeit
Meaning
The state or fact of lasting for only a limited period of time.
Example
The philosophy of Buddhism emphasizes the impermanence of life.
Die buddhistische Philosophie betont die Vergänglichkeit des Lebens.
C1 adjective /ɪnˈtɛlɪdʒəbl/

intelligible

verständlich
Meaning
Able to be understood; clear enough to be comprehended.
Example
Her speech was barely intelligible over the noise.
Durch den Lärm war ihre Rede kaum verständlich.
C1 adjective /ɪnˈfæləbl̩/

infallible

unfehlbar
Meaning
incapable of making mistakes or being wrong
Example
Her judgment seemed infallible in matters of finance.
Ihr Urteil schien in finanziellen Angelegenheiten unfehlbar.
C1 adjective /ɪnˈkrɛdjələs/

incredulous

ungläubig
Meaning
unwilling or unable to believe something
Example
He gave her an incredulous look when she claimed she could fly.
Er warf ihr einen ungläubigen Blick zu, als sie behauptete, fliegen zu können.
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.
C1 adjective /ɪˈnænɪmət/

inanimate

lebensloses Objekt
Meaning
not alive, especially not in the manner of animals and humans; lifeless
Example
The museum was full of inanimate objects from ancient times.
Das Museum war voller lebloser Objekte aus alten Zeiten.
C1 adjective /ɪmˈplɔːzəbl/

implausible

unplausibel
Meaning
Not seeming reasonable or probable; unlikely to be true.
Example
The story she told was so implausible that no one believed her.
Die Geschichte, die sie erzählte, war so unplausibel, dass niemand ihr glaubte.
C1 noun /ɪˈreləvəns/

irrelevance

Irrelevanz
Meaning
the quality of not being connected to or important for a particular matter; lack of significance
Example
His long explanation only highlighted the irrelevance of the details to the main issue.
Seine lange Erklärung zeigte nur die Irrelevanz der Details für das Hauptthema.
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 /ɪmˈprɒmp.tjuː/

impromptu

spontan
Meaning
Done without being planned, organized, or rehearsed; spontaneous.
Example
He gave an impromptu speech at the event.
Er hielt eine spontane Rede bei der Veranstaltung.
C1 adjective /aɪˈreɪt/

irate

zornig
Meaning
Extremely angry.
Example
The customer became irate after waiting for hours.
Der Kunde wurde zornig, nachdem er stundenlang gewartet hatte.
C1 verb /ˈɪnstɪˌɡeɪt/

instigate

anstiften
Meaning
To bring about or initiate an action, often something negative.
Example
He was accused of instigating the riot.
Er wurde beschuldigt, den Aufstand anzustiften.
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.
C1 noun /ɪmˌpɜː.sənˈeɪ.ʃən/

impersonation

Identitätsdiebstahl
Meaning
The action of pretending to be another person for the purpose of entertainment or fraud.
Example
Online impersonation is a serious cybercrime.
Online-Identitätsdiebstahl ist ein ernstes Cyberverbrechen.
C1 adjective /ˌɪmprɪˈsaɪs/

imprecise

ungenau
Meaning
Not exact or accurate; vague.
Example
His explanation was too imprecise to be helpful.
Seine Erklärung war zu ungenau, um hilfreich zu sein.
C1 adjective /ˌɪntəˈrɑːɡətɪv/

interrogative

interrogativ
Meaning
Relating to or conveying a question; in grammar, used to form questions.
Example
She raised an interrogative eyebrow when she heard the news.
Sie hob eine interrogative Augenbraue, als sie die Nachricht hörte.
C1 adjective ɪˈluː.sər.i

illusory

illusorisch
Meaning
Based on illusion; not real although seeming to be.
Example
His sense of security was entirely illusory.
Sein Gefühl der Sicherheit war völlig illusorisch.
C1 noun /ˈɪnlɛt/

inlet

Einlass
Meaning
A small arm of the sea, a lake, or a river; an opening or passage for entry.
Example
The boat entered a narrow inlet along the coast.
Das Boot fuhr in einen engen Einlass entlang der Küste.
C1 adjective /ɪmˈpɜːrviəs/

impervious

undurchlässig
Meaning
Not allowing fluid to pass through; unable to be affected by something.
Example
The jacket is impervious to rain.
Die Jacke ist undurchlässig gegen Regen.
C1 adjective /ɪˈræʃənəl/

irrational

irrational
Meaning
not logical or reasonable; lacking clear thought
Example
His fear of the dark was completely irrational.
Seine Angst vor der Dunkelheit war völlig irrational.
C1 adjective /ˈɪnsələnt/

insolent

unverschämt, arrogant
Meaning
showing a rude and arrogant lack of respect
Example
The insolent student refused to follow the teacher's instructions.
Der unverschämte Schüler weigerte sich, den Anweisungen des Lehrers zu folgen.
C1 adjective /ɪnˈfriːkwənt/

infrequent

selten
Meaning
Happening rarely or not often.
Example
He made infrequent visits to his hometown after moving abroad.
Er machte seltene Besuche in seiner Heimatstadt, nachdem er ins Ausland gezogen war.
C1 noun ɪnˈsɛpʃən

inception

Inception
Meaning
The establishment or starting point of an institution or activity.
Example
The inception of the company marked a new era in the industry.
Die Inception des Unternehmens markierte eine neue Ära in der Industrie.
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.
C1 adjective /ɪmˈpɑːrʃəl/

Impartial

unparteiisch; neutral
Meaning
treating all sides fairly; unbiased; neutral
Example
A good judge must remain impartial throughout the trial.
Ein guter Richter muss während des gesamten Prozesses unparteiisch bleiben.
C1 noun /ɪˈnɜː.ʃə/

Inertia

Inertie; Bewegungsmangel
Meaning
a tendency to do nothing or remain unchanged; lack of activity or movement
Example
The team's inertia prevented them from adapting to the rapidly changing market conditions.
Die Inertie des Teams verhinderte, dass es sich an die sich schnell ändernden Marktbedingungen anpasste.
C1 adjective /ɪˈmeʒərəbəl/

Immeasurable

unermesslich
Meaning
too large or extensive to measure; boundless
Example
The immeasurable love of a mother knows no bounds.
Die unermessliche Liebe einer Mutter kennt keine Grenzen.
C1 adjective /ˈɪmpjəd(ə)nt/

impudent

frech, unverschämt
Meaning
not showing due respect for another person; rude
Example
The impudent child talked back to the teacher.
Das freche Kind antwortete dem Lehrer.
C1 adjective /ɪmˈpʌlsɪv/

impulsive

impulsiv, spontan
Meaning
acting suddenly without careful thought
Example
She made an impulsive decision to buy the car.
Sie traf eine impulsive Entscheidung, das Auto zu kaufen.
C1 noun /ɪnˈsɜːrdʒənt/

insurgent

Aufständischer
Meaning
A person who rises in revolt against authority or government.
Example
The army arrested several insurgents after the attack.
Die Armee verhaftete mehrere Aufständische nach dem Angriff.
C1 adjective /ɪˈrɛvərənt/

irreverent

respektlos
Meaning
showing a lack of respect for people or things that are usually respected
Example
The comedian’s irreverent jokes offended some of the audience.
Die respektlosen Witze des Komikers haben einige Zuschauer beleidigt.
C1 noun /ˌɪn.trəˈspek.ʃən/

introspection

Introspektion
Meaning
The examination or observation of one's own mental and emotional processes; self-reflection.
Example
Through introspection, she gained insight into her emotions.
Durch Introspektion gewann sie tiefere Einblicke in ihre Emotionen.
C1 adjective /ɪˈmjuː.tə.bəl/

immutable

unveränderlich
Meaning
Unchangeable, permanent, or fixed
Example
The laws of physics are considered immutable.
Die Gesetze der Physik gelten als unveränderlich.
C1 adjective /ˈɪndɪɡoʊ bluː/

Indigo-blue

indigoblau
Meaning
a deep blue color with a purplish tinge
Example
The indigo-blue sky looked magnificent at twilight.
Der indigoblaue Himmel sah bei Dämmerung wunderschön aus.
C1 adjective /ɪnˈdʒʊəriəs/

injurious

schädlich
Meaning
Causing or likely to cause harm or damage.
Example
Smoking is injurious to health.
Rauchen ist schädlich für die Gesundheit.
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 adjective ɪnˈdel.ə.bəl

indelible

unvergesslich
Meaning
Making marks that cannot be removed; impossible to forget or remove.
Example
Her speech left an indelible mark on the audience.
Ihre Rede hinterließ einen unvergesslichen Eindruck beim Publikum.
C1 adjective /ˌɪnkəmˈpætəbl/

incompatible

unvereinbar
Meaning
Not able to exist or work together without conflict.
Example
Their personalities were completely incompatible.
Ihre Persönlichkeiten waren völlig unvereinbar.
C1 noun /aɪˈtɪnərɛri/

itinerary

Reiseroute
Meaning
A planned route or schedule of a journey or trip.
Example
The travel agent gave us a detailed itinerary for our vacation.
Der Reiseveranstalter gab uns einen detaillierten Reiseplan für unseren Urlaub.
C1 noun /ɪnˈdɪɡ.nə.ti/

Indignity

Indignität; Demütigung; Erniedrigung;
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.
Sie weigerte sich, die Indignität zu ertragen, ohne einen triftigen Grund durchsucht zu werden.
C1 noun /ˈɪn.fən.tri/

Infantry

infanterie
Meaning
soldiers marching or fighting on foot; foot soldiers collectively
Example
The infantry advanced across the battlefield on foot.
Die Infanterie marschierte zu Fuß über das Schlachtfeld.