Illusion
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B2 noun /ɪˈluː.ʒən/

Illusion

Illusion
Meaning
a thing that is or is likely to be wrongly perceived or interpreted; a false idea or belief
Example
The magician created a spectacular illusion that made the elephant appear to vanish.
Der Magier erschuf eine spektakuläre Illusion, die den Elefanten verschwinden ließ.
A2 adverb /ɪˈmiːdiətli/

immediately

sofort
Meaning
at once; without delay
Example
She responded immediately to the emergency call.
Sie antwortete sofort auf den Notruf.
C2 noun /ˌɪndɛnˈteɪʃən/

indentation

Einzug
Meaning
A space left at the beginning of a line of text; a notch or deep recess on a surface.
Example
The teacher asked the students to use proper indentation in their essays.
Der Lehrer bat die Schüler, die richtige Einrückung in ihren Aufsätzen zu verwenden.
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.
C2 verb /ˈɪndjʊˌreɪt/

indurate

verhärten
Meaning
To harden or make something physically or emotionally tough.
Example
Years of hardship indurated his spirit.
Jahre der Schwierigkeiten härteten seinen Geist.
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 /ˈɪnsɪdənt/

incident

vorfall
Meaning
an event or occurrence, often unpleasant or unusual
Example
The police quickly responded to the incident in the park.
Die Polizei reagierte schnell auf den Vorfall im Park.
C1 adjective /ˌɪn.ɪˈfɛk.tʃu.əl/

ineffectual

ineffektiv
Meaning
Not producing any or the desired effect; lacking the ability or qualities to achieve a purpose.
Example
The manager’s ineffectual leadership caused the team to lose motivation.
Die ineffektive Führung des Managers führte dazu, dass das Team die Motivation verlor.
A1 preposition /ɪn ˈfrʌnt əv/

in front of

vor
Meaning
positioned before or ahead of something; facing or located at the forward side of a person or object
Example
She stood in front of the building.
Sie stand vor dem Gebäude.
C1 noun /ˈɪmɪdʒəri/

imagery

Bildsprache
Meaning
visually descriptive or figurative language, especially in a literary work
Example
The poet's use of imagery brought the scene to life.
Der Einsatz von Bildsprache des Dichters erweckte die Szene zum Leben.
B2 adjective /ˌɪnsɪɡˈnɪfɪkənt/

insignificant

unbedeutend
Meaning
Too small or unimportant to be worth considering.
Example
The cost was so insignificant that nobody noticed it.
Die Kosten waren so unbedeutend, dass niemand sie bemerkte.
C2 verb /ˌɪnkəˈpæsɪteɪt/

incapacitate

unfähig machen
Meaning
to deprive someone or something of the ability or strength to function
Example
The severe injury incapacitated the player for the rest of the season.
Die schwere Verletzung hat den Spieler für den Rest der Saison außer Gefecht gesetzt.
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 adjective /ɪnˈfleɪtɪd/

inflated

aufgeblasen
Meaning
excessively increased in size, value, or importance; filled with air or gas
Example
The company faced criticism for its inflated prices.
Das Unternehmen sah sich wegen seiner aufgeblasenen Preise Kritik ausgesetzt.
B2 verb /ɪnˈsɜːrt/

insert

einsetzen
Meaning
to put or place something into something else
Example
Please insert the key into the lock.
bitte stecken Sie den Schlüssel in das Schloss.
A2 noun /ˈɪlnəs/

illness

Krankheit
Meaning
A condition of being unwell or suffering from a disease.
Example
She missed school due to a serious illness.
Sie hat die Schule wegen einer schweren Krankheit verpasst.
C2 adjective ɪnˈdɒm.ɪ.tə.bəl

indomitable

unbezwingbar
Meaning
Impossible to subdue or defeat.
Example
Her indomitable spirit helped her overcome adversity.
Ihr unbezwungener Geist half ihr, Widrigkeiten zu überwinden.
C2 noun /ˈɪndələns/

indolence

Indolenz
Meaning
Avoidance of activity or exertion; laziness.
Example
His indolence kept him from finishing the project on time.
Seine Indolenz hinderte ihn daran, das Projekt rechtzeitig abzuschließen.
C2 noun /ˌɪntərˈlɒkjətər/

interlocutor

Gesprächspartner
Meaning
a person who takes part in a conversation or dialogue
Example
She was a skilled interlocutor during the debate.
Sie war eine geschickte Gesprächspartnerin während der Debatte.
B2 noun /ɪmˈpeɪʃəns/

impatience

Ungeduld
Meaning
The state of being quickly irritated or unable to wait calmly.
Example
His impatience grew as the meeting dragged on.
Seine Ungeduld wuchs, als sich das Treffen in die Länge zog.
B2 verb /ɪnˈveɪd/

invade

invasieren
Meaning
to enter a place or country forcefully, especially as an enemy
Example
The army invaded the neighboring country.
Die Armee hat das benachbarte Land invadierte.
C1 adjective /ɪnˈsɒlvənt/

insolvent

zahlungsunfähig
Meaning
unable to pay debts owed
Example
The insolvent firm could not meet its financial obligations.
Das zahlungsunfähige Unternehmen konnte seinen finanziellen Verpflichtungen nicht nachkommen.
C1 adjective /ɪnˈtjuː.ɪ.tɪv/

intuitive

intuitiv
Meaning
Based on instinctive understanding rather than reasoning.
Example
The software has an intuitive design that makes it easy to use.
Die Software hat ein intuitives Design, das die Nutzung einfach macht.
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.
C2 adjective /ˌɪɡ.nəˈmɪn.i.əs/

ignominious

ignominös
Meaning
Marked by shame, disgrace, or humiliation.
Example
The team suffered an ignominious defeat in the finals.
Das Team erlitt eine ignominöse Niederlage im Finale.
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.
B2 adjective /ˈɪrɪteɪtɪd/

irritated

gereizt
Meaning
feeling annoyed or impatient; having inflamed or sore physical condition
Example
She felt irritated by the constant noise outside her window.
Sie war durch den ständigen Lärm gereizt.
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.
B2 noun /ɪnˈvɛstɪˌɡeɪtər/

investigator

Glück
Meaning
a person who carries out a formal inquiry or investigation
Example
The investigator gathered evidence from the crime scene.
Sie konnte ihr Glück nicht verbergen, als sie den Preis erhielt.
A2 verb /ɪɡˈnɔːr/

ignore

ignorieren
Meaning
to refuse to take notice of; to disregard intentionally
Example
She decided to ignore the rude comments.
Sie beschloss, die unhöflichen Kommentare zu ignorieren.
C2 adjective /ˌɪrɪˈdɛsənt/

iridescent

irisierend
Meaning
showing luminous colors that seem to change when seen from different angles
Example
She wore an iridescent dress that sparkled in the light.
Sie trug ein irisierendes Kleid, das im Licht funkelte.
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 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.
B2 verb /ɪnˈherɪt/

inherit

erben
Meaning
to receive money, property, or characteristics from someone when they die; to acquire from predecessors
Example
She inherited her grandmother's house.
Sie hat das Haus ihrer Großmutter geerbt.
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.
C2 verb /ˈɪntərˌdɪkt/

interdict

verbieten
Meaning
to prohibit or forbid something by authoritative order, often by law or decree
Example
The court moved to interdict the sale of the illegal goods.
Das Gericht beschloss, den Verkauf der illegalen Waren zu verbieten.
C2 noun /ˌɪnsəˈrɛkʃən/

insurrection

aufstand
Meaning
A violent uprising against an authority or government.
Example
The army was called in to suppress the insurrection.
Die Armee wurde gerufen, um den Aufstand zu unterdrücken.
C1 adjective /ɪnˈvɜːs/

Inverse

umgekehrt; entgegengesetzt
Meaning
opposite in order, nature, or effect; reversed
Example
There is an inverse relationship between price and demand.
Es gibt eine umgekehrte Beziehung zwischen Preis und Nachfrage.
C2 adjective /ˈɪn.dɪ.dʒənt/

indigent

hilfsbedürftig
Meaning
lacking the necessities of life due to poverty; very poor
Example
The hospital offers free care to indigent patients.
Das Krankenhaus bietet indigenten Patienten kostenlose Pflege an.
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.
C2 verb /ɪmˈpjuːn/

impugn

die Wahrheit, Gültigkeit oder Ehrlichkeit einer Aussage oder Absicht bestreiten
Meaning
to dispute the truth, validity, or honesty of a statement or motive
Example
The lawyer tried to impugn the credibility of the witness.
Der Anwalt versuchte, die Glaubwürdigkeit des Zeugen anzufechten.
B2 adjective + noun aɪˈdiːəl ɪnˈvaɪrənmənt

ideal environment

ideale Umgebung
Meaning
Perfect or most suitable conditions for growth or development
Example
Winter creates an ideal environment for vegetable growth.
Der Winter schafft eine ideale Umgebung für das Wachstum von Gemüse.
B2 verb /ɪmˈprɪzən/

imprison

einsperren
Meaning
to put someone in prison; to confine or restrict someone's freedom
Example
The judge imprisoned the criminal for five years.
Der Richter hat den Verbrecher für fünf Jahre eingesperrt.
C1 noun (plural) /ˈɪndɪˌsiːz/

indices

Indizes
Meaning
plural form of index; statistical measures or reference points used for comparison
Example
Stock market indices fell sharply after the announcement.
Die Indizes des Aktienmarkts fielen nach der Bekanntgabe stark.
C1 noun ˌɪn.tuˈɪʃ.ən

intuition

Intuition
Meaning
The ability to understand something immediately, without the need for conscious reasoning.
Example
Her intuition told her something was wrong.
Ihre Intuition sagte ihr, dass etwas nicht stimmte.
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.
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.
C1 noun /ˌɪnækˈtɪvɪti/

inactivity

Inaktivität
Meaning
the state of not being active physically or mentally; lack of action
Example
Prolonged inactivity can negatively affect both physical and mental health.
Längere Inaktivität kann die körperliche und geistige Gesundheit beeinträchtigen.
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 noun /ˈɪn.tə.lekt/

intellect

Intellekt
Meaning
The ability to think, reason, and understand objectively.
Example
Her intellect is admired by all her colleagues.
Ihr Intellekt wird von allen ihren Kollegen bewundert.
C2 noun /ˈɪrɪtənsi/

irritancy

Reizbarkeit
Meaning
the quality or state of causing irritation; legal or formal invalidation
Example
The constant noise became an irritancy to the neighbors.
Der ständige Lärm wurde zu einer Reizbarkeit für die Nachbarn.
C1 noun /ɪnˈdjuːsmənt/

inducement

Anreiz
Meaning
something that persuades or encourages someone to do something
Example
The company offered a bonus as an inducement to employees.
Das Unternehmen bot einen Bonus als Anreiz für die Mitarbeiter an.
C2 noun /ɪnˈtɛstəsi/

intestacy

Tod ohne Testament
Meaning
The condition of dying without having made a valid will.
Example
His estate was divided according to the laws of intestacy.
Sein Vermögen wurde gemäß den Gesetzen der Intestaz vererbt.
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 /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.
C1 noun /ˈɪnstɪˌɡeɪtər/

instigator

Anstifter
Meaning
A person who brings about or initiates something, usually something bad.
Example
The police identified him as the instigator of the violence.
Die Polizei identifizierte ihn als den Anstifter der Gewalt.
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 /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 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 /ɪˈmuː.və.bəl/

immovable

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

indefinitely

unbestimmt
Meaning
for an unlimited or unspecified period of time
Example
The project has been postponed indefinitely.
Das Projekt wurde unbestimmt verschoben.
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.
C2 adjective /ɪˈnjʊərd/

inured

abgestumpft
Meaning
Accustomed to something, especially something unpleasant.
Example
After years of hardship, she was inured to suffering.
Nach Jahren des Leidens war sie an das Schmerzempfinden gewöhnt.
C2 adjective /ˌɪnkənˈsɪdərəbl/

inconsiderable

geringfügig
Meaning
Too small or unimportant to be worth considering.
Example
The donation was not inconsiderable, though smaller than expected.
Die Spende war nicht geringfügig, obwohl sie kleiner als erwartet war.
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.
C2 adjective /ˌɪndaɪˈdʒestəbəl/

Indigestible

indigest; schwer zu verdauen
Meaning
difficult or impossible to digest; hard to process in the stomach
Example
The old bread became hard and indigestible.
Das alte Brot wurde hart und ungenießbar.
B2 verb /ɪnˈhæbɪt/

inhabit

bewohnen
Meaning
to live in; to occupy as a dwelling
Example
Many animals inhabit the forest.
Viele Tiere bewohnen den Wald.
B1 verb ɪnˈspaɪər

inspire

inspirieren
Meaning
To fill someone with the urge or ability to do or feel something, especially creative or noble.
Example
Artemis seeks to inspire future generations.
Artemis strebt danach, zukünftige Generationen zu inspirieren.
C1 adjective /ɪmˈpæsɪv/

impassive

passiv
Meaning
Not showing or feeling emotion; expressionless.
Example
Despite the shocking news, she remained impassive.
Trotz der schockierenden Nachrichten blieb sie passiv.
B2 adjective /ˈɪɡ.nər.ənt/

Ignorant

ignorant
Meaning
lacking knowledge or awareness; uninformed
Example
She was ignorant about the new technology trends.
Sie war ignorant gegenüber den neuen Technologietrends.
A2 verb /ɪnˈkluːd/

include

einschließen
Meaning
to have as part of a whole; to contain or comprise
Example
The price includes all taxes.
Der Preis schließt alle Steuern ein.
B2 noun ˌɪn.fləˈmeɪ.ʃən

inflammation

Entzündung
Meaning
A localized physical condition in which part of the body becomes reddened, swollen, hot, and often painful.
Example
Chronic inflammation can lead to severe diseases.
Chronische Entzündung kann zu schweren Krankheiten führen.
B1 adjective /ˈɪnər/

inner

inner
Meaning
Located inside or closer to the center; relating to one’s thoughts or feelings.
Example
She shared her inner thoughts with her best friend.
Sie teilte ihre inneren Gedanken mit ihrer besten Freundin.
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.
B2 noun ɪnˈsɛntɪvz

incentives

Anreize
Meaning
Things that motivate or encourage one to do something.
Example
Tax incentives are used to encourage investment in renewable energy.
Steueranreize werden verwendet, um Investitionen in erneuerbare Energien zu fördern.
B2 verb /ɪnˈstrʌkt/

instruct

anweisen
Meaning
to teach; to give directions
Example
The teacher instructed the students carefully.
Der Lehrer wies die Schüler sorgfältig an.
B2 adjective /ˌɪnkənˈsɪstənt/

inconsistent

inkonsistent
Meaning
Not staying the same throughout; lacking harmony or regularity.
Example
His answers were inconsistent and confusing.
Seine Antworten waren inkonsistent und verwirrend.
C2 adjective /ˌɪnɪkˈspiːdiənt/

inexpedient

unangebracht
Meaning
Not advisable, suitable, or practical in the circumstances.
Example
It would be inexpedient to invest without proper research.
Es wäre unangebracht, ohne gründliche Recherche zu investieren.
C2 noun /ˌɪnəməˈrɑːtə/

inamorata

Geliebte
Meaning
A woman with whom someone is in love; a female lover.
Example
He wrote a poem dedicated to his inamorata.
Er schrieb ein Gedicht, das seiner Geliebten gewidmet war.
B2 noun ˌɪntəˈlektʃuəlz

intellectuals

Intellektuelle
Meaning
People possessing a highly developed intellect; scholars or academics.
Example
Intellectuals protested against the dominance.
Die Intellektuellen protestierten gegen die Vorherrschaft.
C2 adjective /ˌɪnɪkˈstɛnsəbl/

inextensible

undehnbar
Meaning
Not capable of being stretched or extended.
Example
This rope is made of an inextensible material.
Dieses Seil ist aus einem undehnbaren Material gemacht.
C2 noun /ˈaɪsinəs/

iciness

Kälte
Meaning
The state of being cold in manner or temperature.
Example
There was a distinct iciness in his voice.
Es war eine deutliche Kälte in seiner Stimme.
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.
C2 noun /ˌɪnkrʌˈsteɪʃən/

incrustation

Kruste
Meaning
a crust or hard coating formed on the surface of something
Example
The old pipes were blocked due to heavy incrustation of minerals.
Die alten Rohre waren aufgrund einer starken Verkrustung von Mineralien blockiert.
C2 verb /ɪˈreɪdieɪt/

irradiate

irradieren
Meaning
to shine light on something; to expose to radiation; to illuminate or brighten
Example
The scientist used a lamp to irradiate the sample.
Der Wissenschaftler verwendete eine Lampe, um die Probe zu irradieren.
A2 noun, verb /ˈɪʃuː/

issue

Problem, Veröffentlichung, Verteilung
Meaning
A problem, topic, or the act of supplying or distributing something.
Example
The magazine will issue a new edition next week.
Das Magazin wird nächste Woche eine neue Ausgabe herausgeben.
C1 adjective /ɪˈlɒdʒ.ɪ.kəl/

Illogical

Illogisch
Meaning
not reasonable or sensible; lacking logic
Example
It would be illogical to go swimming in such cold weather.
Es wäre illogisch, bei solch kaltem Wetter schwimmen zu gehen.
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.
B2 verb /ˌɪntərˈfɪər/

interfere

Glück
Meaning
to become involved in something that is not your concern; to hinder or obstruct
Example
Parents should not interfere in their children’s personal choices.
Sie konnte ihr Glück nicht verbergen, als sie den Preis erhielt.
B1 verb /ɪnˈvɛnt/

invent

erfinden
Meaning
to create or design something that has not existed before
Example
Thomas Edison invented the electric bulb.
Thomas Edison erfand die elektrische Glühbirne.
B2 noun /ɪnˈveɪʒən/

invasion

Invasion
Meaning
An instance of invading a country, region, or personal space with armed force or unwelcome presence.
Example
The army prepared for the possibility of an invasion.
Die Armee bereitete sich auf die Möglichkeit einer Invasion vor.
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 adverb ɪnˈtrɪn.zɪ.kli

intrinsically

intrinsisch
Meaning
In a way that is naturally or inherently part of something's essential nature.
Example
Some people are intrinsically motivated to learn.
Einige Menschen sind intrinsisch motiviert zu lernen.
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.
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.
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.
A2 adverb /ɪnˈdiːd/

indeed

in der Tat
Meaning
used to emphasize or confirm a statement
Example
It was a long journey indeed.
Es war eine lange Reise, in der Tat.
C2 adjective /ɪmˈplaɪəbl/

impliable

implizierbar
Meaning
Capable of being implied or suggested.
Example
The meaning of the statement is not directly clear but is impliable from the context.
Die Bedeutung der Aussage ist nicht direkt klar, aber sie ist aus dem Kontext implizierbar.
C2 verb /ɪˈnjʊər/

inure

gewöhnen
Meaning
To become accustomed to something, especially something unpleasant.
Example
Soldiers quickly became inured to the harsh conditions.
Soldaten gewöhnten sich schnell an die harten Bedingungen.
C2 noun /ˌɪnsjəˈlærəti/

insularity

Insularität
Meaning
The state of being isolated or narrow-minded.
Example
The insularity of the group prevented them from accepting new ideas.
Die Insularität der Gruppe verhinderte es, neue Ideen zu akzeptieren.
C2 noun /ˈɪnroʊd/

inroad

Fortschritt
Meaning
An advance or significant progress, often at the expense of something else.
Example
The company made significant inroads into the mobile market.
Das Unternehmen hat signifikante Fortschritte im Mobilmarkt gemacht.
C1 verb /ɪnˈfjuːz/

infuse

infundieren
Meaning
to fill or spread through something; to instill a quality, idea, or feeling
Example
The teacher tried to infuse her students with a love for reading.
Die Lehrerin versuchte, ihren Schülern eine Liebe zum Lesen zu infundieren.
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.
A2 verb /ɪnˈvaɪtɪd/

invited

eingeladen
Meaning
asked someone formally or politely to go somewhere or do something
Example
She was invited to the party.
Sie wurde zur Party eingeladen.
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 /ˌɪnkoʊˈɜːrsəbl̩/

incoercible

unbezwingbar
Meaning
Not capable of being forced, compelled, or restrained.
Example
Her incoercible spirit inspired others to fight for justice.
Ihr unbezwingbarer Geist inspirierte andere, für Gerechtigkeit zu kämpfen.
C1 noun /ɪnˈdʌstriəsnəs/

industriousness

Fleiß
Meaning
The quality of being hardworking and diligent.
Example
His industriousness earned him a promotion at work.
Sein Fleiß brachte ihm eine Beförderung bei der Arbeit ein.
B2 adjective /ˈɪn.tɪ.mət/

Intimate

intim; nahe; privat
Meaning
close in friendship; private and personal; detailed knowledge
Example
They have an intimate friendship that has lasted for decades.
Sie haben eine intime Freundschaft, die seit Jahrzehnten besteht.
C2 adjective /ɪnˈsɛnʃənt/

insentient

gefühllos
Meaning
Lacking perception, consciousness, or sensation.
Example
The rock is an insentient object with no awareness.
Der Felsen ist ein gefühlloses Objekt ohne Bewusstsein.
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.
B2 verb /ɪmˈpoʊz/

impose

auferlegen
Meaning
to force someone to accept something; to establish or apply by authority
Example
The government imposed new taxes on luxury goods.
Die Regierung hat neue Steuern auf Luxusgüter auferlegt.
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.
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 /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.
A1 adjective /ɪmˈpɔː.tənt/

important

wichtig
Meaning
Of great significance or value; likely to have a profound effect on success, survival, or well-being.
Example
Important steps must be taken to address pollution.
Wichtige Schritte müssen unternommen werden, um die Verschmutzung zu bekämpfen.
B2 noun /ˈɪnˌsaɪt/

insight

Einsicht
Meaning
The ability to understand the true nature of something; deep understanding.
Example
Her insight into human behavior made her a successful psychologist.
Ihre Einsicht in menschliches Verhalten machte sie zu einer erfolgreichen Psychologin.
B2 adjective /ɪnˈtɛnsɪv/

intensive

intensiv
Meaning
Involving a lot of effort, energy, or concentration in a short period of time.
Example
She attended an intensive English course before moving abroad.
Sie besuchte einen intensiven Englischkurs, bevor sie ins Ausland zog.
C2 adjective /ˌɪrɪˈfrændʒɪbəl/

irrefrangible

unverletzlich
Meaning
Not to be broken, violated, or infringed
Example
The constitution guarantees certain irrefrangible rights to every citizen.
Die Verfassung garantiert jedem Bürger bestimmte unverletzliche Rechte.
B2 noun /ɪnˈkwaɪəri/ or /ˈɪnkwəri/

inquiry

Untersuchung / Anfrage
Meaning
An act of asking for information; an investigation into something.
Example
The committee launched an inquiry into the financial irregularities.
Der Ausschuss leitete eine Untersuchung der finanziellen Unregelmäßigkeiten ein.
C2 adjective /ˌɪntəˈrɒɡətəri/

interrogatory

interrogativ
Meaning
expressed in the form of a question; relating to questioning
Example
The lawyer’s interrogatory tone made the witness uncomfortable.
Der interrogative Ton des Anwalts machte den Zeugen unwohl.
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.