C1 noun /ˈɪŋ.krə.mənt/

Increment

増加

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.

彼は今年、自分の給料に5パーセントの年次増加を受け取った。

C1 noun ɪnˈsɒl.vən.si

insolvency

破産

Meaning

The state of being unable to pay debts owed; bankruptcy.

Example

The company declared insolvency after years of losses.

その会社は多くの損失の後、破産を宣言した。

C1 adjective /ɪnˈseɪʃəbl̩/

insatiable

満たされない

Meaning

impossible to satisfy; always wanting more

Example

Her insatiable curiosity drove her to read every book in the library.

彼女の満たされない好奇心は、図書館のすべての本を読むように彼女を駆り立てた。

C1 verb /ɪmˈpiːtʃ/

impeach

Meaning

To charge a public official with misconduct while in office.

Example

The parliament voted to impeach the president.

C1 noun /ˌɪnklɪˈneɪʃən/

inclination

傾向

Meaning

A natural tendency or urge to act or feel in a particular way.

Example

She has an inclination towards helping others.

彼女は他の人を助ける傾向があります。

C1 adjective /ɪnˈstɪŋk.tɪv/

instinctive

本能的, 自然な, 自動的

Meaning

Based on instinct; done without conscious thought; natural and automatic.

Example

His instinctive reaction saved his life.

彼の本能的な反応は彼の命を救った。

C1 noun /ˈɪntrɪkəsi/

intricacy

複雑さ

Meaning

the quality of being very detailed or complicated

Example

The intricacy of the design impressed everyone.

デザインの複雑さは全員を感動させました。

C1 noun /ɪnˌkɑːsəˈreɪʃən/

incarceration

投獄

Meaning

the state of being imprisoned or confined

Example

The criminal faced years of incarceration for his crimes.

犯人はその犯罪のために長年の投獄を受けた。

C1 adjective /ɪnˈflæməˌtɔːri/

inflammatory

幸せ

Meaning

causing inflammation in the body; arousing anger, hostility, or strong emotion

Example

His inflammatory speech triggered protests across the city.

彼女は賞を受け取ったとき、幸せそうな表情を隠せなかった。

C1 adjective /ˌɪntərˈtwaɪnd/

intertwined

幸福

Meaning

closely connected or twisted together

Example

Their lives became deeply intertwined after the accident.

彼女は賞を受け取ったとき、幸せを隠せませんでした。

C1 adjective /ˌɪnədˈmɪsəbl̩/

inadmissible

受け入れられない

Meaning

Not allowed, especially as evidence in a court of law.

Example

The judge ruled the evidence inadmissible.

裁判官は証拠を受け入れられないと判断しました。

C1 verb /ɪnˈkrɪmɪˌneɪt/

incriminate

有罪にする

Meaning

to make someone appear guilty of a crime or wrongdoing

Example

The new evidence could incriminate the suspect in the robbery case.

新しい証拠がロビー事件の容疑者を有罪にする可能性があります。

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。

C1 noun /ɪmˈprɪzənmənt/

imprisonment

投獄

Meaning

the act of putting someone in prison; the state of being confined as punishment

Example

He faced imprisonment for violating the court order.

彼は裁判所の命令に違反して投獄に直面した。

C1 noun /ˈɪtʃ.i.nəs/

itchiness

かゆみ

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.

目のかゆみはしばしば擦る原因となります。

C1 verb /ˈɪtəreɪt/

iterate

反復する

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.

ソフトウェアチームは、ユーザーのニーズを満たすまでデザインを繰り返します。

C1 adjective /ˌɪnhɒˈspɪtəbl/

inhospitable

住みにくい

Meaning

Harsh and difficult to live in; unfriendly or unwelcoming to guests.

Example

The desert is an inhospitable environment for most plants.

砂漠はほとんどの植物にとって住みにくい環境です。

C1 adjective /ɪˈrɛpərəbəl/

Irreparable

修復不可能

Meaning

impossible to repair or fix; permanent damage that cannot be undone

Example

The accident caused irreparable damage to his spine.

その事故は彼の背骨に修復不可能な損傷を与えました。

C1 noun /ˌɪnflɛksɪˈbɪlɪti/

inflexibility

柔軟性の欠如

Meaning

the quality of being rigid or unwilling to change; lack of adaptability

Example

The inflexibility of the rules caused unnecessary delays.

規則の柔軟性の欠如が不要な遅れを引き起こした。

C1 adverb, adjective /ˌɪnkɑːɡˈniːtoʊ/

incognito

インコグニート

Meaning

In disguise or with one's identity concealed.

Example

The celebrity traveled incognito to avoid the paparazzi.

有名人はパパラッチを避けるためにインコグニートで旅行した。

C1 adjective /ɪnˈkwɪzɪtɪv/

inquisitive

好奇心旺盛な

Meaning

Curious or eager to learn and ask questions.

Example

The inquisitive child asked endless questions about the stars.

好奇心旺盛な子供は星について無限に質問をしました。

C1 adjective /ˌɪrɪˈprɛsəbl̩/

irrepressible

抑制できない

Meaning

Impossible to control or restrain.

Example

She had an irrepressible urge to laugh during the speech.

彼女はスピーチ中に抑制できない笑いの衝動を隠すことができませんでした。

C1 verb /ɪˈmɔːrtəlaɪz/

immortalize

不朽の

Meaning

to preserve the memory of someone or something forever

Example

The statue was built to immortalize the hero’s sacrifice.

その像は、英雄の犠牲を永遠にするために建てられました。

C1 noun /ˌɪntəkəˈnɛktɪvɪti/

interconnectivity

相互接続性

Meaning

The state of being interconnected or the degree of connectivity between components

Example

The rise of interconnectivity has transformed global communication.

インターコネクティビティの発展は、世界中のコミュニケーションを変革しました。

C1 adjective /ɪnˈveə.ri.ə.bəl/

Invariable

不変の; 一定の; 常に同じ

Meaning

never changing; constant; always the same

Example

His invariable routine includes morning exercise and coffee.

彼の不変のルーチンには、朝の運動とコーヒーが含まれています。

C1 adjective /ɪˈrɛfjʊtəbəl/

Irrefutable

反論できない

Meaning

impossible to deny or disprove; undeniable

Example

The evidence against him was irrefutable.

彼に対する証拠は否定できないものでした。

C1 adjective /ɪnˈsʌf.ər.ə.bəl/

insufferable

耐え難い

Meaning

Too extreme to bear; intolerable.

Example

The heat during the summer was insufferable.

夏の暑さは耐え難かった。

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 verb /ɪnˈvɪɡ.ər.eɪt/

invigorate

活性化する

Meaning

To give strength or energy to someone or something.

Example

A morning walk can invigorate both body and mind.

朝の散歩は、体と心を活性化することができます。

C1 noun /ɪnˈkɜːrʒən/

incursion

侵入

Meaning

A sudden attack or invasion into a place or territory.

Example

The army repelled the enemy incursion at the border.

軍隊は国境で敵の侵入を撃退した。

C1 adjective /ˌɪndɪˈskrɪmɪnət/

indiscriminate

無差別

Meaning

Done without careful judgment; random or haphazard.

Example

The indiscriminate use of pesticides harms the environment.

農薬の無差別な使用は環境に害を与えます。

C1 adjective /ˌɪlɪˈdʒɪtɪmət/

illegitimate

不正

Meaning

Not authorized by law, rules, or standards; not recognized as valid.

Example

The court ruled the contract to be illegitimate.

裁判所は契約が不正であると判断しました。

C1 noun /aɪˈtɪnərɛri/

itinerary

旅程

Meaning

A planned route or schedule of a journey or trip.

Example

The travel agent gave us a detailed itinerary for our vacation.

旅行代理店は私たちの休暇のために詳細な旅程を提供してくれました。

C1 adjective /ɪnˈkɒŋɡruəs/

incongruous

不調和

Meaning

Not fitting in with or suitable for the surroundings.

Example

His jokes were incongruous during the serious meeting.

彼の冗談は真面目な会議では不調和だった。

C1 noun /ˈɪnflʌks/

influx

流入

Meaning

A large arrival or flow of people or things.

Example

The city experienced an influx of tourists during the festival.

その都市は祭りの期間中に観光客の流入を経験しました。

C1 verb /ɪnˈfleɪm/

inflame

煽る

Meaning

to arouse strong feelings or provoke anger; to cause inflammation in the body

Example

The politician's remarks served to inflame public opinion.

政治家の発言は公共の意見を煽る結果になった。

C1 adjective /ˌɪrɪˈvɜːrsəbl/

irreversible

不可逆な

Meaning

Not able to be undone, changed, or reversed.

Example

The damage caused by the fire was irreversible.

火事によって生じた損害は不可逆でした。

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。

C1 noun /ˈɪnstɪˌɡeɪtər/

instigator

扇動者

Meaning

A person who brings about or initiates something, usually something bad.

Example

The police identified him as the instigator of the violence.

警察は彼を暴力の扇動者として特定しました。

C1 verb /ɪmˈpɑːrt/

impart

伝える

Meaning

to make information known; to bestow or communicate

Example

The teacher imparted valuable knowledge to her students.

教師は生徒に貴重な知識を授けました。

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。

C1 noun /ˌɪnkəmˌpætəˈbɪlɪti/

incompatibility

非互換性

Meaning

the state of being unable to exist or work together harmoniously; lack of compatibility

Example

The project failed because of incompatibility between the two software systems.

2つのソフトウェアシステムの非互換性のため、そのプロジェクトは失敗した。

C1 adjective ˌɪn.trəˈspek.tɪv

introspective

内省的

Meaning

Characterized by or given to introspection; examining one's own thoughts and feelings.

Example

Writers tend to be highly introspective individuals.

作家はしばしば非常に内省的な人々である。

C1 verb /ɪnˈfrɪndʒ/

infringe

侵害する

Meaning

To actively break the terms of a law, agreement, or right.

Example

Copying this software without permission will infringe copyright laws.

許可なくこのソフトウェアをコピーすると著作権法を侵害することになります。

C1 adjective /ɪˈnuːmərəbəl/

Innumerable

無数; 数えきれない; 無限

Meaning

too many to be counted; countless; infinite in number

Example

There are innumerable stars in the night sky that we cannot see with our naked eyes.

夜空には数えきれない星があり、私たちは裸眼では見ることができません。

C1 verb /ˌɪnstɪˈtjuːʃənəlaɪz/

institutionalize

制度化する

Meaning

to establish something as a formal institution, custom, or practice

Example

The government seeks to institutionalize environmental protection.

政府は環境保護を制度化しようとしています。

C1 adjective /ɪnˈhjuːmən/

Inhuman

非人道的

Meaning

lacking human qualities of compassion and mercy; cruel or barbaric

Example

The prisoners were kept in inhuman conditions.

囚人たちは非人道的な状況で収容されていました。

C1 adjective /ˌɪrɪˈspɛktɪv/

Irrespective

無視して; 問わず

Meaning

without taking something into account; regardless of

Example

All students will be treated equally, irrespective of their background.

すべての学生は、背景に関係なく平等に扱われます。

C1 noun /ˌɪnkəmˈpliːtnəs/

incompleteness

不完全さ

Meaning

the state of not being complete or whole; lack of necessary parts or fullness

Example

The incompleteness of the report caused delays in the project.

レポートの不完全さがプロジェクトの遅れを引き起こした。

C1 adjective /ˌɪnækˈsɛsəbl/

inaccessible

アクセスできない

Meaning

unable to be reached, entered, or understood

Example

The remote village is almost inaccessible during the rainy season.

その遠隔地の村は雨季にはほとんどアクセスできません。

C1 adjective /ˈɪnsələnt/

insolent

無礼な、傲慢な

Meaning

showing a rude and arrogant lack of respect

Example

The insolent student refused to follow the teacher's instructions.

その無礼な学生は教師の指示に従うことを拒否した。

C1 noun /ˌɪnkənˈsɪstənsi/

inconsistency

不一致

Meaning

The quality of being contradictory, irregular, or not staying the same.

Example

There is an inconsistency between his words and actions.

彼の言葉と行動には不一致があります。

C1 adjective /ɪnˈvɑːlənˌtɛri/

involuntary

不随意

Meaning

done without will or conscious control

Example

He gave an involuntary shiver when he heard the loud noise.

彼は大きな音を聞いたとき、不随意に震えた。

C1 verb /ɪnˈkɜːr/

incur

負う

Meaning

To bring upon oneself something undesirable, usually as a result of actions.

Example

He incurred a fine for parking in the wrong place.

彼は間違った場所に駐車して罰金を科せられた。

C1 adjective /ˌɪndɪˈskriːt/

indiscreet

軽率

Meaning

Not careful in what one says or does, likely to reveal secrets or offend.

Example

It was indiscreet of him to mention the plan in public.

公衆の面前で計画について言及するのは軽率だった。

C1 verb /ˈɪrɪˌɡeɪt/

irrigate

灌漑する

Meaning

to supply water to land or crops; to wash out a wound with water

Example

Farmers irrigate their fields during dry seasons.

農家は乾季に畑に灌漑を行います。

C1 adjective /ˌɪnkənˈsɪdərət/

inconsiderate

思いやりがない

Meaning

Thoughtless; showing a lack of concern for others.

Example

It was inconsiderate of him to play loud music late at night.

夜遅くに大きな音で音楽を流すことは、思いやりがない行動でした。

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 noun /ˈɪrɪtənt/

irritant

刺激物

Meaning

something that causes irritation or discomfort

Example

Dust is a common irritant for people with allergies.

ほこりはアレルギーを持つ人々にとって一般的な刺激物です。

C1 noun /ˈɪn.tə.lekt/

intellect

知能

Meaning

The ability to think, reason, and understand objectively.

Example

Her intellect is admired by all her colleagues.

彼女の知能はすべての同僚に賞賛されています。

C1 noun /ɪnˈtɛstɪn/

intestine

腸

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.

医者は、小腸で栄養素がどのように吸収されるかを説明しました。

C1 noun /ɪnˈfjuːʒən/

infusion

注入

Meaning

the act of introducing something into another; a drink made by steeping leaves or herbs in liquid

Example

She prepared a calming infusion of chamomile tea.

彼女はカモミールティーの落ち着く注入を準備しました。

C1 adjective /ɪnˈflɛksəbl/

inflexible

柔軟性がない

Meaning

Not able to bend or change; unwilling to change ideas or behavior.

Example

His inflexible attitude made negotiations difficult.

彼の柔軟性がない態度は交渉を難しくしました。

C1 adjective /ˌɪnkənˈkluːsɪv/

inconclusive

結論が出ていない

Meaning

Not leading to a definite result or decision.

Example

The investigation remained inconclusive due to a lack of evidence.

証拠の不足により、調査は結論が出ていないままでした。

C1 adjective ɪnɪɡˈzɔːstɪbəl

inexhaustible

尽きることのない

Meaning

Unable to be used up or worn out; limitless.

Example

His inexhaustible energy allowed him to work tirelessly on his projects.

彼の尽きることのないエネルギーは、彼がプロジェクトに休むことなく取り組むことを可能にしました。

C1 noun ˌɪn.toʊˈneɪ.ʃən

intonation

イントネーション

Meaning

The rise and fall of tone in speech and pronunciation.

Example

Proper intonation enhances the clarity of a speech.

適切なイントネーションはスピーチの明確さを高めます。

C1 adjective /ɪˈlɪsɪt/

illicit

不法な

Meaning

Forbidden by law, rules, or custom.

Example

The police shut down the illicit drug operation.

警察は不法な麻薬取引を閉鎖しました。

C1 noun /ɪˈmɜː.ʃən/

immersion

没入

Meaning

Complete engagement in an environment or experience.

Example

Immersion in VR games makes users feel like they are inside the virtual world.

VRゲームへの没入は、ユーザーが仮想世界にいるように感じさせます。

C1 noun ˈɪn.fər.əns

inference

推論

Meaning

A conclusion reached on the basis of evidence and reasoning; logical deduction.

Example

Scientists make inferences based on experimental data.

科学者たちは実験データに基づいて推論を行います。

C1 adjective /ɪnˈɛlɪdʒəbəl/

Ineligible

不適格; 無資格; 選ばれない

Meaning

not qualified or entitled to participate or be chosen; unsuitable

Example

Students with poor grades are ineligible for the scholarship program.

成績が悪い学生は奨学金プログラムに応募できません。

C1 noun /ɪnˈhɛrɪtər/

inheritor

相続人

Meaning

a person who receives money, property, or a title when someone dies

Example

She became the inheritor of her family's estate.

彼女は家族の財産の相続人となった。

C1 noun/verb /ˈɪnsɛns/

incense

お香 / 激怒させる

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.

お香の香りが寺院を満たしましたが、彼の失礼な言葉は彼女を激怒させました。

C1 adjective /ɪˈlʌstriəs/

illustrious

著名

Meaning

Well known, respected, and admired for past achievements.

Example

She had an illustrious career in medicine.

彼女は医学の分野で著名なキャリアを持っていた。

C1 adjective /ɪnˈtændʒəbl/

intangible

無形の

Meaning

Unable to be touched or grasped; not having a physical presence.

Example

Trust is an intangible quality in relationships.

信頼は関係において無形の特質です。

C1 noun /ˌɪntɪˈmeɪʃən/

intimation

示唆

Meaning

A subtle or indirect hint or suggestion.

Example

She gave no intimation of her plans.

彼女は自分の計画について何の示唆も与えなかった。

C1 adjective /aɪˈdɪlɪk/

idyllic

田園詩のように美しい

Meaning

Like an idyll; extremely happy, peaceful, or picturesque.

Example

They enjoyed an idyllic vacation by the sea.

彼らは海辺で田園詩のような休暇を楽しみました。

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。

C1 adjective /ˈɪnfəməs/

infamous

悪名高い

Meaning

well known for some bad quality or deed

Example

The dictator was infamous for his cruelty.

その独裁者はその残虐さで悪名高かった。

C1 adjective /ˌɪmprɪˈsaɪs/

imprecise

不正確

Meaning

Not exact or accurate; vague.

Example

His explanation was too imprecise to be helpful.

彼の説明はあまりにも不正確で役に立たなかった。

C1 noun ɪˌræʃ.ənˈæl.ɪ.ti

irrationality

非合理性, 非論理性, 不合理

Meaning

The quality of being illogical or unreasonable; lack of rational thought.

Example

His decision was driven by complete irrationality.

彼の決定は完全に非合理的でした。

C1 noun ɪnˌɛv.ɪ.təˈbɪl.ɪ.ti

inevitability

避けられない運命

Meaning

The quality of being certain to happen and impossible to avoid or prevent.

Example

The inevitability of change is a part of life.

変化の避けられないことは人生の一部です。

C1 noun /ɪnˈsɒm.ni.ə/

Insomnia

不眠症

Meaning

habitual sleeplessness; inability to sleep; the condition of being unable to sleep

Example

Her chronic insomnia made it difficult for her to concentrate during work hours.

彼女の慢性的な不眠症は、仕事中に集中するのを難しくさせた。

C1 verb /ɪnˈtɒksɪkeɪt/

intoxicate

幸せ

Meaning

to make someone lose control of their faculties or behavior due to alcohol or drugs

Example

The strong drink quickly intoxicated him.

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なかった。

C1 verb /ɪnˈkɑːrsəreɪt/

incarcerate

投獄する

Meaning

to imprison or confine someone

Example

The authorities incarcerated the criminal after the trial.

当局は裁判後に犯罪者を投獄しました。

C1 adjective /ɪnˈtɛlɪdʒəbl/

intelligible

Meaning

Able to be understood; clear enough to be comprehended.

Example

Her speech was barely intelligible over the noise.

C1 adjective /ɪnˈsɪstənt/

insistent

執拗な

Meaning

demanding something firmly and refusing to accept no

Example

The child was insistent on getting a new toy.

その子供は新しいおもちゃを手に入れることに執拗だった。

C1 adjective /ɪnˈtɒl.ər.ə.bəl/

Intolerable

耐えられない

Meaning

unable to be endured; extremely unpleasant or painful

Example

The noise from the construction site was intolerable.

工事現場の騒音は耐えられないほどひどかった。

C1 adjective /ˌaɪdiəˈlɪstɪk/

Idealistic

理想主義的

Meaning

pursuing high principles or ideals; unrealistically optimistic

Example

She has an idealistic view of changing the world.

彼女は世界を変えるという理想主義的な見方を持っています。

C1 adjective ɪˈluː.sər.i

illusory

幻の

Meaning

Based on illusion; not real although seeming to be.

Example

His sense of security was entirely illusory.

彼の安全感は完全に幻のものだった。

C1 adjective /ɪˈniː.bri.eɪ.tɪd/

inebriated

酔っ払った

Meaning

under the influence of alcohol; drunk

Example

He stumbled into the room completely inebriated.

彼は完全に酔っ払って部屋に入ってきた。

C1 noun /ɪnˈdaɪtmənt/

indictment

起訴状

Meaning

a formal charge or accusation of a serious crime

Example

The indictment accused the company of multiple violations.

起訴状は、会社に対する複数の違反を告発しました。

C1 noun /ɪnˈsæn.ə.ti/

Insanity

狂気; 精神疾患

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.

弁護人は、被告人が狂気によって無罪であると主張した。

C1 verb ɪmˈbjuː

Imbue

誰かの心にアイデアや感情を深く浸透させる

Meaning

Mixing some idea or feeling deeply into someone's mind

Example

The teacher tried to imbue students with a love for learning.

教師は学生に学びへの愛を伝えようとした。

C1 adjective /ɪnˈkrɛdjələs/

incredulous

Meaning

unwilling or unable to believe something

Example

He gave her an incredulous look when she claimed she could fly.

C1 verb /ɪmˈpiːd/

impede

妨げる

Meaning

To obstruct or hinder the progress or development of something.

Example

Lack of funds can impede business growth.

資金不足はビジネスの成長を妨げる可能性があります。

C1 noun ˌɪnfrəˈstrʌktʃərəl dɪˈveləpmənt

infrastructural development

インフラ整備

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.

インフラストラクチャー開発は効率的なリサイクルに必要です。

C1 adjective /ɪnˈkɒmp(ə)rəbl/

incomparable

比類のない

Meaning

Without an equal in quality or excellence; matchless.

Example

The view from the mountain was incomparable.

山からの景色は比類のないものでした。

C1 adjective, noun /ˈɪnvəlɪd/ (adjective), /ɪnˈvælɪd/ (noun)

invalid

無効

Meaning

Not valid; having no force or effect. Also refers to a person too weak or ill to care for themselves.

Example

The court declared the contract invalid.

裁判所は契約を無効と宣言した。

C1 adjective /ɪnˈɡreɪnd/

ingrained

根強い

Meaning

Firmly fixed or established; deeply rooted and difficult to change.

Example

His ingrained habits were hard to break.

彼の根強い習慣は壊すのが難しかった。

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。

C1 adjective /ɪnˈdefɪnət/

Indefinite

不確定な

Meaning

not clearly defined; uncertain; vague; unlimited in time

Example

The meeting has been postponed for an indefinite period.

会議は不確定な期間に延期されました。

C1 noun /ˌɪm.pəˈzɪʃ.ən/

Imposition

課税; 負担; 不公平な要求

Meaning

the action or process of imposing something or of being imposed; an unfair burden or demand

Example

The imposition of new taxes without consultation angered the citizens greatly.

相談なしに新しい税金が課され、市民は非常に怒りました。

C1 noun /ˌɪməˈtjʊərəti/

immaturity

未熟さ

Meaning

the state of not being fully developed emotionally, mentally, or physically; lack of maturity

Example

His immaturity made it difficult for him to handle responsibility.

彼の未熟さは責任を果たすことを難しくした。

C1 verb /ˌɪntərˈsɛpt/

intercept

Meaning

to stop, catch, or seize something on its way from one place to another

Example

The police intercepted the stolen car before it crossed the border.

C1 adjective /ɪmˈpɜːmiəbl/

impermeable

不透水の

Meaning

Not allowing fluid or gas to pass through.

Example

The container is made of impermeable plastic.

その容器は不透水のプラスチックでできています。

C1 noun ˌɪnsjʊˈleɪʃən

insulation

絶縁

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.

食品保管エリアの絶縁は、害虫が侵入するのを防ぐことができます。

C1 adjective /ˌɪndɪˈstɪŋkt/

indistinct

不明瞭な

Meaning

Not clear or sharply defined; vague or blurred.

Example

The sound of voices was indistinct in the distance.

遠くからの声は不明瞭でした。

C1 verb /ɪˈnɔːɡjʊreɪt/

inaugurate

Meaning

To formally begin or introduce something, especially with a ceremony.

Example

The mayor will inaugurate the new bridge tomorrow.

C1 adjective /ˌɪn.səˈbɔːr.dɪ.nət/

insubordinate

命令不服従

Meaning

Defiant of authority; disobedient to orders.

Example

The insubordinate employee refused to follow the manager's instructions.

命令不服従の従業員は、マネージャーの指示に従うことを拒否した。

C1 adjective /ɪnˈfæləbl̩/

infallible

間違いない

Meaning

incapable of making mistakes or being wrong

Example

Her judgment seemed infallible in matters of finance.

彼女の判断は財務問題において間違いないように見えた。

C1 noun /ɪnˈɛk.wɪ.ti/

inequity

不平等

Meaning

Lack of fairness or justice; unequal distribution or treatment.

Example

Social inequity continues to be a global issue.

社会的不平等は依然としてグローバルな問題です。

C1 adjective /ɪnˈsɛp(ə)rəbəl/

inseparable

切り離せない

Meaning

Unable to be separated or always together.

Example

The two friends have been inseparable since childhood.

二人の友達は子供の頃から切り離せないです。

C1 noun /ɪˈreləvəns/

irrelevance

無関係性

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.

彼の長い説明は、細部が主な問題と無関係であることを強調しただけだった。

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。

C1 adjective /ɪnˈdʒʊəriəs/

injurious

有害な

Meaning

Causing or likely to cause harm or damage.

Example

Smoking is injurious to health.

喫煙は健康に有害です。

C1 noun /ˈɪmɪdʒəri/

imagery

イメージ

Meaning

visually descriptive or figurative language, especially in a literary work

Example

The poet's use of imagery brought the scene to life.

詩人のイメージの使用は、シーンに命を吹き込みました。

C1 adjective /ˌɪn.səbˈstæn.ʃəl/

insubstantial

不十分な

Meaning

Lacking strength, substance, or solidity.

Example

The evidence provided was insubstantial and unconvincing.

提供された証拠は不十分で説得力がなかった。

C1 noun /ɪnˌtɪmɪˈdeɪʃən/

intimidation

威圧

Meaning

The action of frightening or threatening someone to make them do something.

Example

The workers reported cases of intimidation by the management.

労働者たちは経営陣による威圧の事例を報告しました。

C1 noun /ˈɪnkwest/

inquest

調査

Meaning

A legal or official inquiry, especially into the cause of a death.

Example

The inquest revealed the cause of the accident.

調査は事故の原因を明らかにしました。

C1 noun /ɪmˈpɜːrtɪnəns/

impertinence

無礼

Meaning

lack of respect; rudeness

Example

The teacher was shocked by the student's impertinence.

教師は生徒の無礼さに驚いた。

C1 adjective /ˈɪrɪtəbl/

irritable

Meaning

easily annoyed or made angry

Example

She became irritable after working long hours without rest.