C1 adjective /ɪnˈflæməbəl/

Inflammable

可燃; 発火性

Meaning

easily set on fire; flammable; combustible

Example

The inflammable material caught fire quickly.

その可燃性材料はすぐに火をつけました。

C2 adjective /ɪnˈɛksərəbl/

inexorable

避けられない

Meaning

Impossible to stop or prevent; relentless.

Example

The inexorable rise of technology is changing every aspect of life.

テクノロジーの避けられない上昇は、生活のすべての側面を変えています。

A2 adverb /ɪˈmiːdiətli/

immediately

直ちに

Meaning

at once; without delay

Example

She responded immediately to the emergency call.

彼女は緊急の電話に直ちに応答した。

C1 adjective /ɪnˈvɛntɪv/

inventive

創造的

Meaning

Having the ability to create or design new things or to think originally.

Example

The inventor was known for his inventive solutions to everyday problems.

発明家は日常の問題に対する創造的な解決策で知られていた。

B1 adjective /ɪmˈpruːvd/

improved

改善された

Meaning

made better or enhanced in quality or condition

Example

Her health has significantly improved since last month.

彼女の健康は先月から大きく改善されました。

B1 noun /ɪmˈprɛʃən/

impression

印象, 概念

Meaning

an idea, feeling, or opinion about something or someone

Example

The book gave me a good first impression.

その本は私に良い最初の印象を与えました。

C2 noun /ˌɪn.trəˈɡreʃ.ən/

introgression

遺伝子流入

Meaning

The transfer of genetic information from one species to another through repeated backcrossing.

Example

Introgression plays a significant role in plant breeding.

イントログレッションは植物育種において重要な役割を果たします。

B1 noun ɪˈnɪʃətɪvz

initiatives

イニシアティブ

Meaning

Actions or strategies designed to resolve a difficulty or improve a situation; programs or projects.

Example

Community initiatives benefit underprivileged groups.

コミュニティのイニシアティブは恵まれないグループに利益をもたらす。

C2 adjective /ɪnˈsɛnseɪt/

insensate

無感情な

Meaning

lacking physical sensation or empathy; without feeling or sensitivity

Example

The dictator's insensate cruelty shocked the world.

独裁者の無感情な残虐さは世界を驚かせた。

C2 adjective /ɪˈmɒdərət/

immoderate

過度な

Meaning

excessive; beyond reasonable limits

Example

He has an immoderate love for sweets.

彼はお菓子に対して過度の愛情を持っています。

B2 noun /ˌɪntərˈfɪərəns/

interference

干渉

Meaning

the action of interfering with something

Example

The radio signal was disrupted due to interference from nearby electronics.

近くの電子機器からの干渉で、ラジオ信号が途絶えました。

B2 adjective ˌɪnstrəˈmɛntl

instrumental

重要な

Meaning

Serving as a crucial means, agent, or tool; having a part in bringing about a result.

Example

Children can be instrumental in building a better society.

子供たちは、より良い社会を作るために重要な役割を果たすことができます。

B2 adjective /ɪnˈtɛnsɪv/

intensive

集中的

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.

彼女は海外に引っ越す前に、集中的な英語コースを受講しました。

C2 noun /ˌɪdiəˈsɪŋkrəsi/

idiosyncrasy

特異性

Meaning

A distinctive or peculiar characteristic, habit, or mannerism unique to an individual.

Example

One of her idiosyncrasies was humming while working.

彼女の一つの特異性は、仕事中に口ずさむことでした。

C1 noun ˌɪnfɛsˈteɪʃən

infestation

侵入, 異常に大量の昆虫や動物がある場所に存在すること

Meaning

The presence of an unusually large number of insects or animals in a place, causing damage or disease.

Example

The infestation of ants in the kitchen led to immediate pest control measures.

キッチンにおけるアリの侵入は、即座に害虫駆除対策を講じる結果となった。

C2 adjective /ˌɪnsəˈluːbriəs/

insalubrious

不健康

Meaning

Unhealthy or not conducive to well-being.

Example

They moved out of the insalubrious neighborhood for the sake of their health.

彼らは健康のために不健康な地域から引っ越しました

C1 noun ˌɪnˈsaɪtfʊlnɪs

insightfulness

洞察力、分析能力

Meaning

The capacity to gain an accurate and deep intuitive understanding of a person or thing.

Example

His insightfulness helped solve the complex problem.

彼の洞察力は複雑な問題を解決するのに役立ちました。

C1 verb /ˌɪn.trəˈspekt/

introspect

内省する

Meaning

To examine one's own thoughts, feelings, or mental state.

Example

He often introspects before making important decisions.

彼は重要な決定を下す前にしばしば自己分析をします。

C2 verb /ɪnˈveɪɡəl/

inveigle

誘惑する

Meaning

To persuade someone to do something by deception or flattery.

Example

She inveigled him into signing the contract.

彼女は彼に契約書に署名させた。

C1 adjective ˌɪn.krəˈmen.təl

incremental

増分的

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.

増分的な変化は持続可能性を確保します。

C2 noun /ˌɪnkrɪˈdjuːləti/

incredulity

不信

Meaning

the state of being unwilling or unable to believe something

Example

She looked at him with incredulity after hearing the strange story.

彼女はその奇妙な話を聞いた後、不信のまなざしで彼を見つめた。

C2 noun /ˈɪndɪkənt/

indicant

指標

Meaning

Something that indicates or points to a fact or condition.

Example

High fever is often an indicant of infection.

高熱はしばしば感染の指標となります。

A2 noun, verb /ˈɪʃuː/

issue

問題, 発行, 配布

Meaning

A problem, topic, or the act of supplying or distributing something.

Example

The magazine will issue a new edition next week.

雑誌は来週新しい版を発行します。

C1 noun /ˈɪŋklɪŋ/

inkling

予感

Meaning

A slight idea, hint, or suspicion about something.

Example

She had an inkling that he was planning a surprise.

彼女は彼がサプライズを計画しているという予感を持っていた。

A1 preposition/adverb/adjective/noun /ˌɪnˈsaɪd/

inside

幸せ

Meaning

Situated within something; the inner part of something.

Example

She waited inside the house until the rain stopped.

彼女は賞を受け取ったとき、自分の幸せを隠すことができませんでした。

C2 adjective /ɪnˈeɪliənəbl/

inalienable

譲渡不可能

Meaning

Unable to be taken away or transferred; absolute and permanent.

Example

Freedom of speech is an inalienable right.

言論の自由は譲渡不可能な権利です。

B2 adjective ɪnˈdɪdʒɪnəs

indigenous

先住民の

Meaning

Originating or occurring naturally in a particular place; native.

Example

Indigenous plants are well adapted to the local environment.

先住民の植物は地元の環境にうまく適応しています。

C2 adjective /ˌɪndɪˈsɜːrnəbl/

indiscernible

見分けがつかない

Meaning

Impossible or difficult to see, notice, or distinguish.

Example

The difference between the two shades was almost indiscernible.

二つの色調の違いはほとんど見分けがつかなかった。

C1 adjective ɪnˈdʒiː.ni.əs

ingenious

独創的

Meaning

Showing inventiveness and skill; clever, original, and inventive.

Example

His ingenious ideas transformed modern physics.

彼の独創的なアイデアは現代物理学を変えました。

C1 noun /ɪˌreɡjəˈlærɪti/

irregularity

不規則性

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.

監査により、その会社の記録にいくつかの財務上の不規則性が明らかになった。

C1 noun /ˈɪn.fən.tri/

Infantry

歩兵

Meaning

soldiers marching or fighting on foot; foot soldiers collectively

Example

The infantry advanced across the battlefield on foot.

歩兵は戦場を徒歩で進んだ。

C1 adjective ɪmˈpɛkəbl

impeccable

完璧な

Meaning

In accordance with the highest standards; faultless.

Example

His impeccable taste in fashion was admired by all his peers.

彼の完璧なファッションセンスは、すべての同僚に賞賛されました。

C2 noun /ˌɪndɛnˈteɪʃən/

indentation

インデント

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.

先生は学生にエッセイで適切なインデントを使用するように頼みました。

C2 adjective /ˌɪnkəmˈprɛsəbl/

incompressible

圧縮不可能

Meaning

Not able to be pressed or squeezed into a smaller space.

Example

Liquids are generally considered incompressible.

液体は通常、圧縮不可能と見なされます。

B2 noun ˈɪnər strɛŋkθ

inner strength

内面の強さ

Meaning

Mental or spiritual power that helps a person cope with difficulties.

Example

Community service fosters inner strength in individuals.

コミュニティサービスは個人に内面的な強さを育む。

C2 adjective /ɪnˈtɛmpərət/

intemperate

不節制な

Meaning

Lacking self-control; immoderate, especially in indulgence.

Example

The politician's intemperate remarks caused controversy.

政治家の不節制な発言は論争を引き起こした。

B2 noun, verb /ˈɪnstɪˌtjuːt/

institute

インスティチュート

Meaning

as a noun, an organization founded for a specific purpose; as a verb, to establish or initiate

Example

The university decided to institute new rules for the library.

大学は図書館のために新しいルールを設立することを決定しました。

C2 verb /ɪnˈɡrɑːft/

ingraft

根付ける

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.

先生は生徒たちに良いマナーを根付かせようとした。

C2 adjective /ˌɪnkənˈsɪdərəbl/

inconsiderable

取るに足らない

Meaning

Too small or unimportant to be worth considering.

Example

The donation was not inconsiderable, though smaller than expected.

寄付は取るに足らなかったが、予想よりも小さかった。

B1 adjective /ˈɪnəsənt/

Innocent

無実の; 純粋な; 無害な

Meaning

free from guilt or sin; pure; harmless; naive

Example

The innocent child had no idea that her parents were planning a surprise party.

その無実の子供は、両親がサプライズパーティーを計画していることを知りませんでした。

C2 adjective /ˌɪrɪˈtriːvəbl/

irretrievable

回復不可能

Meaning

impossible to recover or regain

Example

The documents were lost in an irretrievable way after the fire.

火事の後、文書は回復不可能な方法で失われました。

B2 noun /ˈɪnˌsaɪt/

insight

洞察力

Meaning

The ability to understand the true nature of something; deep understanding.

Example

Her insight into human behavior made her a successful psychologist.

彼女の人間行動に対する洞察力は、彼女を成功した心理学者にした。

C1 adjective ˌɪm.pəˈsɛp.tɪ.bəl

imperceptible

気づかれない

Meaning

So subtle or gradual that it is difficult to notice or perceive

Example

The changes in his behavior were imperceptible at first.

彼の行動の変化は最初は気づかれないものでした。

C2 adjective /ˌɪndɪˈsɒljʊbl/

indissoluble

解消できない

Meaning

Unable to be destroyed, broken, or dissolved.

Example

Marriage was once considered an indissoluble bond.

結婚はかつて解消できない絆と見なされていました。

B2 verb /ɪnˈveɪd/

invade

侵入する

Meaning

to enter a place or country forcefully, especially as an enemy

Example

The army invaded the neighboring country.

軍隊は隣国に侵入しました。

C2 verb /ɪnˈdɛmnɪfaɪ/

indemnify

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.

B2 noun /ˌɪmɪˈɡreɪʃən/

immigration

移民

Meaning

the action of coming to live permanently in a foreign country

Example

Immigration policies vary from country to country.

移民政策は国によって異なります。

C1 noun /ɪˈmiːdiəsi/

immediacy

即時性, 緊迫感

Meaning

The quality of bringing one into direct and instant involvement with something, giving rise to a sense of urgency or excitement.

Example

The immediacy of digital communication has reshaped business operations.

デジタルコミュニケーションの即時性は、ビジネスの運営方法を変えました。

C1 adjective /ɪmˈpʌlsɪv/

impulsive

衝動的な, 直感的な

Meaning

acting suddenly without careful thought

Example

She made an impulsive decision to buy the car.

彼女は衝動的な決定で車を買うことにしました。

C1 verb /ɪnˈfjuːz/

infuse

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.

C1 noun ɪmˈpɛə(r)mənt

impairment

損傷、障害

Meaning

The state of being damaged or weakened; a disability or handicap.

Example

Hearing impairment can be caused by long-term exposure to loud noise.

聴力障害は長期間の大きな音への曝露によって引き起こされる可能性があります。

B2 adjective /ˌɪd.iˈɒt.ɪk/

Idiotic

愚か

Meaning

extremely stupid; foolish; senseless

Example

His idiotic behavior embarrassed everyone at the meeting.

彼の愚かな行動は会議でみんなを困らせた。

C2 adjective /ɪnˈsɪpɪd/

insipid

味気ない

Meaning

lacking flavor, interest, or excitement; dull

Example

The soup was insipid and needed more seasoning.

スープは味気なく、もっと調味料が必要でした。

C1 adjective /ˌɪnkəʊˈhɪərənt/

incoherent

一貫性のない

Meaning

Not clear or easy to understand; lacking logical connection.

Example

His explanation was so incoherent that nobody could follow it.

彼の説明はあまりにも一貫性がなく、誰もそれを追うことができませんでした。

C2 noun /ɪnˈtɛstəsi/

intestacy

遺言なしで死亡

Meaning

The condition of dying without having made a valid will.

Example

His estate was divided according to the laws of intestacy.

彼の財産は遺言なしでの法則に従って分けられた。

C1 noun /ɪnˈdɪf.ər.əns/

Indifference

無関心; 無関心さ; アパシー

Meaning

lack of interest, concern, or sympathy; the state of not caring about something

Example

His indifference to his studies resulted in poor grades throughout the semester.

彼の学業に対する無関心さが、学期中ずっと悪い成績をもたらした。

C2 noun /ɪmˈpjuːɪsəns/

impuissance

無力, 無能

Meaning

inability to take effective action; helplessness

Example

The government’s impuissance in the face of crisis frustrated the people.

危機の前で政府の無力さが人々を失望させた。

C1 adjective /ˈaɪərnˌklæd/

ironclad

鉄壁の

Meaning

impossible to change, break, or dispute; very strong and firm

Example

The company had an ironclad contract with its suppliers.

その会社はサプライヤーと鉄壁の契約を結んでいた。

B2 noun /ˌɪmpərˈfɛkʃən/

imperfection

不完全

Meaning

a flaw, defect, or weakness; the state of being imperfect

Example

She accepted her imperfection as part of being human.

彼女は人間であることの一部として自分の不完全さを受け入れた。

C1 noun ɪnˈdʌldʒəns

indulgence

嗜好

Meaning

The practice of allowing oneself to enjoy the pleasure of something.

Example

His indulgence in junk food affected his health.

彼のジャンクフードへの過度の嗜好は健康を害した。

C2 noun /ɪnˈtɜːrmənt/

interment

埋葬

Meaning

The act of burying a dead body in a grave or tomb.

Example

The interment took place at the family cemetery.

埋葬は家族の墓地で行われました。

C1 noun /ˈɪnlɛt/

inlet

入り江

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.

船は海岸沿いの狭い入り江に入った。

C2 verb /ˌɪmpɔːrˈtuːnd/

importuned

しつこく頼む

Meaning

asked someone persistently and pressingly for something

Example

She importuned her boss for a raise until he finally gave in.

彼女は昇給を求めて上司にしつこく頼んだ、彼がとうとう折れたまで。

B2 adjective /ˌɪnsɪˈkjʊə/

insecure

不安定

Meaning

not confident or assured; uncertain and anxious

Example

She felt insecure about her performance in the exam.

彼女は試験での自分のパフォーマンスに不安を感じていました。

C2 noun /ˌɪmbəˈsɪləti/

imbecility

愚かさ

Meaning

Extreme foolishness, stupidity, or weakness of mind.

Example

The plan was abandoned due to its sheer imbecility.

その計画はその愚かさから放棄されました。

B2 adjective /ɪˈmædʒɪnəbl/

imaginable

想像できる

Meaning

Capable of being imagined or conceived.

Example

They offered every imaginable type of food at the festival.

彼らはフェスティバルであらゆる想像できるタイプの食べ物を提供しました。

B2 noun ɪnˈsɛntɪvz

incentives

インセンティブ

Meaning

Things that motivate or encourage one to do something.

Example

Tax incentives are used to encourage investment in renewable energy.

税制上のインセンティブは再生可能エネルギーへの投資を促進するために使用されます。

C1 noun ˌɪrɪˈvɜːrsəbl ˈdæmɪdʒ

irreversible damage

取り返しのつかない損害

Meaning

Harm or injury that cannot be undone or repaired.

Example

Climate change causes irreversible damage to ecosystems.

気候変動は生態系に取り返しのつかない損害を与えます。

B2 adjective /ɪˈreɡjələr/

irregular

不規則な

Meaning

not even or consistent in shape, pattern, time, or behavior; not following normal rules

Example

His attendance at work has been irregular this month.

今月、彼の出勤は不規則だった。

C1 adverb /ɪnˈvɜːrs.li/

Inversely

逆に; 反対に

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.

商品の価格は市場での入手可能性に逆に関連しています。

B2 noun /ˈɪntərvəl/

interval

インターバル

Meaning

a period of time between two events or points; a pause or break in activity

Example

There was a short interval between the two performances.

二つの公演の間には短いインターバルがありました。

B2 noun /ˌaɪ.səˈleɪ.ʃən/

Isolation

隔離

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.

患者は感染症の拡大を防ぐために隔離されました。

C2 adjective /ˌɪnkɔːrˈpɔːriəl/

incorporeal

無形

Meaning

lacking a physical body; not composed of matter; intangible

Example

Ghosts are often described as incorporeal beings.

ゴーストはしばしば無形の存在として描かれます。

C2 adjective /aɪˈsɒ.krə.nəs/

isochronous

等時間間隔で発生する

Meaning

Occurring at equal time intervals; in unison or synchrony.

Example

The pendulum swings are isochronous, repeating at equal intervals.

振り子の動きは等時性があり、等しい間隔で繰り返されます。

B1 abbreviation /ˌaɪˈiː/

ie

すなわち

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.

多くの両生類、すなわちカエルとサラマンダーは、水中と陸上の両方で生きることができます。

C2 noun /ˌɪn.təˈvɛn.ʃə.nɪ.zəm/

interventionism

介入主義

Meaning

Government policy of active involvement in economic affairs.

Example

The central bank's interventionism helped stabilize inflation.

中央銀行の介入主義はインフレの安定に役立った。

C1 adjective /ɪnˈsteɪbəl/

instable

不安定な

Meaning

not stable; liable to change, collapse, or fail; lacking firmness or reliability

Example

The instable political situation worried foreign investors.

不安定な政治状況が外国の投資家を心配させた。

B2 adjective /ˌɪrɪˈzɪstəbəl/

Irresistible

抗し難い

Meaning

too attractive and tempting to be resisted; impossible to resist

Example

The chocolate cake was absolutely irresistible.

チョコレートケーキは絶対に抵抗できないほど魅力的だった。

B2 noun /ɪnˈdʌstriəl ˌrɛvəˈluːʃən/

Industrial Revolution

産業革命

Meaning

The rapid development of industry that occurred in Britain in the late 18th and 19th centuries, brought about by the introduction of machinery and characterized by the use of steam power and the growth of factories.

Example

The Industrial Revolution marked a shift in production processes.

産業革命は生産プロセスにおける変化を示しました。

C2 adjective/noun /ɪnˈkɑːrnədiːn/

incarnadine

深紅

Meaning

a bright crimson or pinkish-red color

Example

The sky turned incarnadine at sunset.

太陽が沈むと空は深紅色に変わった。

A2 adverb /ɪnˈstɛd/

instead

代わりに

Meaning

As an alternative or substitute.

Example

She didn’t buy the dress; instead, she chose a pair of shoes.

彼女はドレスを買わなかった。代わりに、彼女は靴を選んだ。

C2 adjective /ɪˈnjʊərd/

inured

慣れた

Meaning

Accustomed to something, especially something unpleasant.

Example

After years of hardship, she was inured to suffering.

長年の苦しみの後、彼女は苦しみに慣れていた。

C2 noun /ˌɪnsəˈrɛkʃən/

insurrection

反乱

Meaning

A violent uprising against an authority or government.

Example

The army was called in to suppress the insurrection.

軍隊は反乱を鎮圧するために呼ばれました。

C1 adjective /ɪˈmjuː.tə.bəl/

immutable

不変の

Meaning

Unchangeable, permanent, or fixed

Example

The laws of physics are considered immutable.

物理法則は不変と見なされます。

C1 noun /ˈɪnsɪdəns/

incidence

発生率

Meaning

the occurrence, rate, or frequency of something

Example

The incidence of road accidents has decreased this year.

今年の道路事故の発生率は減少しました。

C1 verb /ɪmˈpɛrɪl/

imperil

危険にさらす

Meaning

To put in danger or at risk.

Example

Reckless driving can imperil the lives of others.

無謀な運転は他人の命を危険にさらす可能性があります。

C2 noun /ɪnˈtɛmpərəns/

intemperance

節度を欠くこと

Meaning

Lack of moderation or self-control, especially with drinking or eating.

Example

His intemperance in drinking ruined his health.

彼の飲酒の節度を欠くことが健康を害した。

B1 verb /ɪnˈvɛs.tɪ.ɡeɪt/

investigate

調査する

Meaning

to carry out a systematic inquiry to discover facts or information

Example

The police will investigate the incident thoroughly.

警察は事件を徹底的に調査するでしょう。

B2 adjective /aɪˈrɒnɪk/

ironic

皮肉な、風刺的な

Meaning

happening in the opposite way to what is expected, often amusing or sarcastic

Example

It is ironic that the fire station burned down.

消防署が焼けるのは皮肉です。

C1 verb /ɪnˈtruːd/

intrude

干渉する

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.

彼は彼らのプライベートな会話に干渉して恥ずかしく思った。

B2 adjective /ˌɪnkəmˈpliːt/

incomplete

不完全

Meaning

Not finished, lacking some parts or not whole.

Example

Her report was incomplete and needed further details.

彼女の報告は不完全で、詳細が必要でした。

B1 noun ɪnˈven.ʃən

invention

発明

Meaning

The action of inventing something, typically a process or device.

Example

The invention revolutionized communication.

その発明はコミュニケーションを革命的に変えました。

C2 verb /aɪˈtɪnəˌreɪt/

itinerate

旅行する

Meaning

To travel from place to place, usually for the purpose of work or preaching.

Example

The missionary itinerated throughout the region to spread the message.

伝道師は地域を巡り、メッセージを広めました。

B2 noun ˌɪm.plɪˈkeɪ.ʃən

implication

含意

Meaning

A conclusion that can be drawn from something although it is not explicitly stated; a likely consequence.

Example

The implication of climate change is severe.

気候変動の含意は深刻です。

B1 adjective /ˈɪrɪteɪtɪŋ/

irritating

いらいらさせる

Meaning

causing annoyance, impatience, or mild anger

Example

The constant noise from the street is extremely irritating.

通りからの絶え間ない騒音はいらいらさせる。

C2 adjective /ˌɪlˈneɪ.tʃəd/

ill-natured

性格が悪い

Meaning

Having a bad or unpleasant character; unkind or malicious.

Example

He made an ill-natured remark about his colleague.

彼は同僚について悪意のある発言をしました。

C1 noun /ˈɪmɪnəns/

imminence

差し迫り、間近な状態

Meaning

the state of being about to happen

Example

The imminence of the storm forced people to take shelter.

嵐の差し迫りが人々を避難させることを強制した。

C2 adjective /ˌɪrɪˈdɛsənt/

iridescent

虹色の

Meaning

showing luminous colors that seem to change when seen from different angles

Example

She wore an iridescent dress that sparkled in the light.

彼女は光の中で輝く虹色のドレスを着ていました。

C2 adjective /ɪnˈɡreɪʃiˌeɪtɪŋ/

ingratiating

お世辞を言う

Meaning

Charming or flattering in a way intended to gain favor.

Example

His ingratiating smile made everyone trust him quickly.

彼のお世辞を言う笑顔は、すべての人々に彼を素早く信頼させた。

C1 adjective /ɪˈnænɪmət/

inanimate

無生物

Meaning

not alive, especially not in the manner of animals and humans; lifeless

Example

The museum was full of inanimate objects from ancient times.

博物館には古代の無生物がいっぱいだった。

B1 noun ˌɪnspɪˈreɪʃən

inspiration

インスピレーション

Meaning

The process of being mentally stimulated to do or feel something, especially to do something creative.

Example

His journey to success became an inspiration for many.

彼の成功への道は多くの人々にインスピレーションを与えました。

C2 adjective /ɪnˈɡlɔːriəs/

inglorious

不名誉な

Meaning

Causing shame or disgrace; not bringing honor or glory.

Example

The army suffered an inglorious defeat.

軍隊は不名誉な敗北を喫した。

A1 preposition /ɪn/

in

中

Meaning

expressing the situation of being enclosed or surrounded by something

Example

She is in the kitchen preparing dinner.

彼女は台所で夕食を準備している。

B2 adjective /ˌɪnkənˈviːniənt/

Inconvenient

不便な; 面倒な; 困難な

Meaning

causing trouble, difficulties, or discomfort; awkward; troublesome

Example

The broken elevator made it inconvenient to reach the top floor.

壊れたエレベーターは、最上階に到達するのを不便にしました。

A2 verb /ɪɡˈnɔːr/

ignore

無視する

Meaning

to refuse to take notice of; to disregard intentionally

Example

She decided to ignore the rude comments.

彼女は失礼なコメントを無視することに決めました。

C2 adjective /ˌɪnsəˈpɔːrtəbl̩/

insupportable

耐えられない

Meaning

Too extreme or difficult to be endured.

Example

The heat was insupportable during the long journey.

長い旅の間、暑さは耐えられなかった。

C2 verb /ɪnˈdɒktrɪˌneɪt/

indoctrinate

教義を押し付ける

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.

その政権は宣伝を通じて若者を洗脳しようとした。

B2 adjective /ˈɪnfɪnɪt/

infinite

無限

Meaning

limitless or endless in space, extent, or number

Example

The universe is often described as infinite.

宇宙はしばしば無限だと説明されます。

C2 adjective /ˌɪməˈmɔːriəl/

immemorial

不朽の

Meaning

Extending back beyond memory or record; ancient.

Example

The tradition has been followed since time immemorial.

その伝統は不朽の時代から受け継がれてきた。

C1 noun /ˌɪnkoʊˈhɪrəns/

incoherence

不整合

Meaning

The quality of being unclear, confused, or lacking logical connection.

Example

His speech was full of incoherence and difficult to follow.

彼のスピーチは不整合で、理解するのが難しかった。

B1 verb ɪnˈspaɪər

inspire

インスパイアする

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.

アルテミスは未来の世代にインスパイアを与えようとしています。

C1 noun /ɪˌluːmɪˈneɪʃən/

illumination

Meaning

the act of lighting something or making something clear

Example

The street was filled with bright illumination from the lamps.

C2 verb /ˌɪntərˈsiːd/

intercede

Meaning

to act or plead on behalf of someone in difficulty or trouble; to intervene between parties to help resolve a dispute

Example

She interceded with the teacher to give her brother another chance.

C1 adjective /ɪnˈdʌstriəs/

industrious

勤勉な

Meaning

Hardworking and diligent in one's duties.

Example

She is an industrious student who always completes her assignments on time.

彼女は常に期限通りに課題を終わらせる勤勉な学生です。

A2 noun /ˈɪn.sekt/

Insect

昆虫

Meaning

a small invertebrate animal with six legs and usually one or two pairs of wings

Example

The butterfly is a beautiful insect that flies from flower to flower.

蝶は花から花へと飛ぶ美しい昆虫です。

C1 verb /ɪmˈpɒvərɪʃ/

impoverish

貧困にする

Meaning

To make someone poor or reduce the quality or richness of something.

Example

The long war impoverished the entire nation.

長い戦争が国全体を貧困にした。

C1 noun /ˌɪn.dʒəˈnjuː.ɪ.ti/

ingenuity

独創性

Meaning

The quality of being clever, original, and inventive.

Example

His ingenuity led to groundbreaking innovations.

彼の創意工夫は画期的な革新を生み出しました。

C1 adjective /ɪmˈplɔːzəbl/

implausible

信じがたい

Meaning

Not seeming reasonable or probable; unlikely to be true.

Example

The story she told was so implausible that no one believed her.

彼女が話した話はあまりにも信じられないほどで、誰も彼女を信じなかった。

B2 adjective /ɪnˈdɪf.ər.ənt/

indifferent

無関心

Meaning

having no particular interest or concern; not caring one way or another

Example

She was indifferent to the outcome of the match.

彼女は試合の結果に無関心だった。

C1 noun /aɪˈdiː.ə.lɪ.zəm/

Idealism

理想主義

Meaning

the pursuit of high principles and noble goals; unrealistic pursuit of perfection

Example

His youthful idealism motivated him to join various social justice movements.

彼の若い理想主義は、彼を様々な社会正義運動に参加させる原動力となった。

C1 noun /ˌɪntərˈdʒɛkʃən/

interjection

感嘆詞

Meaning

a word or phrase used to express sudden emotion or reaction, often standing alone

Example

Words like 'wow' and 'ouch' are common interjections in English.

'わお'や'痛っ'は英語でよく使われる感嘆詞です。