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。

B2 adjective /ɪnˈkeɪpəbəl/

incapable

無能力な

Meaning

lacking the ability, skill, or capacity to do something

Example

He is incapable of understanding complex instructions.

彼は複雑な指示を理解できない。

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。

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。

C2 adjective /ˈɪn.dɪ.dʒənt/

indigent

困窮

Meaning

lacking the necessities of life due to poverty; very poor

Example

The hospital offers free care to indigent patients.

病院は困窮した患者に無料でケアを提供しています。

C1 noun /ɪnˈfɜːməri/

infirmary

診療所

Meaning

A hospital or place where the sick or injured are cared for.

Example

The school had an infirmary for minor injuries.

学校には軽傷のための診療所がありました。

C2 adjective /ˌɪn.ɪˈlʌk.tə.bəl/

ineluctable

Meaning

Impossible to avoid or escape; inevitable.

Example

Death is an ineluctable part of human existence.

C2 adjective /ɪˈnɪmɪkəl/

inimical

敵対的 / 不利な

Meaning

tending to obstruct or harm; unfriendly or hostile

Example

The policy was inimical to the country's economic growth.

その政策は国の経済成長に不利だった。

C2 adjective /ɪmˈpælpəbəl/

impalpable

触れない

Meaning

unable to be felt by touch; difficult to grasp or understand

Example

There was an impalpable sense of fear in the room.

部屋には触れない恐怖感があった。

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。

B2 adjective + noun aɪˈdiːəl ɪnˈvaɪrənmənt

ideal environment

理想的な環境

Meaning

Perfect or most suitable conditions for growth or development

Example

Winter creates an ideal environment for vegetable growth.

冬は野菜の成長に理想的な環境を作り出します。

C2 noun /ɪnˌtɜːrpəˈleɪʃən/

interpolation

補間

Meaning

The act of inserting something into a text or estimating values within a sequence of data.

Example

The scientist used interpolation to predict the missing data points.

科学者は欠落したデータポイントを予測するために補間を使用しました。

A1 noun /aɪs/

Ice

氷

Meaning

water that has frozen and become solid

Example

The ice in my drink melted quickly in the hot weather.

私の飲み物の氷は暑い天気で素早く溶けました。

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。

C2 noun /ˌɪntərpəˈzɪʃən/

interposition

介入

Meaning

The act of intervening or coming between two things, often to influence or prevent an outcome.

Example

The manager’s interposition prevented a heated argument from escalating.

マネージャーの介入は、激しい議論がエスカレートするのを防ぎました。

C2 noun /aɪˈdɒlətri/

idolatry

偶像崇拝

Meaning

The worship of idols or extreme admiration for someone or something.

Example

The priest condemned the idolatry practiced in the village.

司祭は村で行われている偶像崇拝を非難した。

B2 noun /ˈɪnfənt/

infant

乳児

Meaning

A very young child or baby.

Example

The infant was sleeping peacefully in the cradle.

乳児はゆりかごで静かに眠っていました。

C1 noun /ˌɪnsəˈfɪʃənsi/

insufficiency

不足

Meaning

The state of not being enough or not being adequate.

Example

The project failed due to the insufficiency of funds.

プロジェクトは資金不足のため失敗しました。

C1 adjective /ˈɪnərmoʊst/

Innermost

最も深い; 最も個人的な

Meaning

most private and secret; deepest; most personal

Example

She shared her innermost feelings with her closest friend.

彼女は最も深い感情を最も親しい友人と共有しました。

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。

B2 noun /ɪnˈsaɪdə/

insider

インサイダー

Meaning

a person within a group or organization who has access to confidential information

Example

He was an insider who knew all the company's secrets.

彼は会社のすべての秘密を知っているインサイダーでした。

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。

C2 noun /ˌɪnˌkeɪpəˈbɪləti/

incapability

無能力

Meaning

lack of ability or power to do something; inability or incompetence

Example

His incapability to manage the team led to serious problems.

チームを管理する彼の無能力は深刻な問題を引き起こした。

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。

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。

C1 verb /ɪmˈploʊd/

implode

内爆

Meaning

To collapse or burst inward violently.

Example

The old building imploded during the demolition.

古い建物は解体中に内向きに崩壊しました。

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。

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。

B2 adjective /ɪmˈper.ə.tɪv/

imperative

命令形

Meaning

Of vital importance; crucial; giving or expressing a command.

Example

It is imperative to address the climate crisis immediately.

気候危機に直ちに対処することがインペラティブです。

C2 adverb /ˈaɪsɪli/

icily

冷たく

Meaning

In a very cold, unfriendly, or hostile manner.

Example

She replied icily to his question.

彼女は冷たく彼の質問に答えた。

C1 noun /ɪnˈdɪɡ.nə.ti/

Indignity

屈辱

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.

彼女は正当な理由もなく荷物検査を受けるという屈辱に耐えることを拒んだ。

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。

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。

B2 noun /ɪnˈtɪəriər/

interior

インテリア

Meaning

the inside part of something; inner area of a place or object

Example

The interior of the hotel was beautifully decorated.

ホテルのインテリアは美しく装飾されていました。

B2 adjective /ˈɪnˌsaɪtfəl/

insightful

洞察力のある

Meaning

Showing deep understanding or perceptiveness.

Example

The professor gave an insightful lecture on global economics.

教授はグローバル経済に関する洞察力のある講義を行いました。

B2 adjective, noun /ɪzˈreɪli/

israeli

イスラエルの

Meaning

relating to Israel or its people; a person from Israel

Example

She works for an Israeli company.

彼女はイスラエルの会社で働いています。

C1 adjective /ˌɪnsərˈmaʊntəbl/

insurmountable

克服不可能

Meaning

Too great to be overcome.

Example

The explorers faced insurmountable odds in the desert.

探検者たちは砂漠で克服不可能な障害に直面した。

C1 adjective /ˌɪndɪˈspjuːtəbəl/

Indisputable

議論の余地がない; 否定できない; 確定的

Meaning

impossible to deny or argue against; undeniable; certain

Example

The evidence against him was indisputable.

彼に対する証拠は議論の余地がなかった。

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。

C1 adjective /ɪmˈpɑːrʃəl/

Impartial

公正; 中立的

Meaning

treating all sides fairly; unbiased; neutral

Example

A good judge must remain impartial throughout the trial.

優れた裁判官は裁判中に公正を保たなければなりません。

B2 noun /ˌɪm.ɪˈteɪ.ʃən/

Imitation

模倣; コピー; レプリカ

Meaning

the action of using someone or something as a model; a copy of something original

Example

His imitation of the famous actor was so good that everyone burst into laughter.

彼の有名な俳優のイミテーションはとても上手で、みんなが笑い出しました。

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。

B2 adjective /ɪnˈfɪə.ri.ər/

inferior

劣等

Meaning

Of lower quality, rank, or status.

Example

This material is inferior to the one we used before.

この素材は以前使ったものより劣っています。

C2 adjective /ɪmˈpɛn.ɪ.tənt/

impenitent

後悔しない

Meaning

Not feeling regret or shame about one's actions.

Example

The criminal remained impenitent after the trial.

犯人は裁判後も後悔しないままでした。

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。

B2 noun ˌɪn.fləˈmeɪ.ʃən

inflammation

炎症

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.

慢性炎症は重篤な疾患を引き起こす可能性があります。

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 verb /ɪnˈdaɪt/

indict

起訴する

Meaning

to formally accuse someone of committing a serious crime

Example

The grand jury decided to indict the politician for corruption.

大陪審団は腐敗のために政治家を起訴することを決定した。

C2 noun /ˈɪntərˌloʊpər/

interloper

干渉者

Meaning

A person who becomes involved in a situation or place where they are not wanted.

Example

He felt like an interloper at the private family gathering.

彼はプライベートな家族の集まりで干渉者のように感じた。

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。

B2 noun ˌɪn.tɪˈɡreɪ.ʃən

integration

統合。統一。

Meaning

The action or process of integrating; the process of combining or adding parts to make a unified whole.

Example

Integration of networks will improve global communication.

ネットワークの統合は、グローバルなコミュニケーションを改善します。

C2 noun /ˈɪn.tɪ.ɡreɪ.tɪv dɪˈpləʊ.mə.si/

integrative diplomacy

統合的外交

Meaning

A diplomatic approach that seeks to combine or coordinate different elements, interests, or parties into a unified whole.

Example

Integrative diplomacy strengthens alliances.

統合的外交は同盟を強化する。

B2 verb ˈɪmplɪment

implement

実施する

Meaning

To put a decision or plan into effect; to execute or apply.

Example

Implementing educational policies is essential for progress.

教育政策を実施することは進歩にとって重要です。

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。

A2 pronoun /ɪtˈsɛlf/

itself

それ自身

Meaning

Used to emphasize the thing just mentioned; by its own power or effort.

Example

The cat cleaned itself after eating.

猫は食べた後、自分で自分をきれいにした。

C1 adjective /ɪnˈkɒmpɪtənt/

incompetent

Meaning

Lacking the necessary ability or skills to do something successfully.

Example

He was fired because he was incompetent at his job.

C2 adjective /ɪmˌpɜːrˈsweɪdəbl/

impersuadable

説得できない

Meaning

not able to be convinced or persuaded

Example

She remained impersuadable despite all our arguments.

彼女はすべての議論にもかかわらず説得できなかった。

C2 adjective /ˌɪnkəmˈbʌstəbl/

incombustible

不燃

Meaning

Not capable of catching fire or burning.

Example

This material is incombustible and safe for construction.

この材料は燃えません、安全に建設に使用できます。

A1 noun /ˈɪntənet/

internet

グローバルコンピュータネットワーク

Meaning

A global computer network providing a variety of information and communication facilities.

Example

The internet has revolutionized the way we access information.

インターネットは情報へのアクセス方法を革新しました。

B1 verb /ɪnˈtend/

intend

意図する

Meaning

to plan or have in mind as a purpose; to mean

Example

I intend to finish this project by tomorrow.

私はこのプロジェクトを明日までに終わらせるつもりです。

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 ˌɪn.stəˈleɪ.ʃən

installation

インストール

Meaning

The action or process of installing someone or something, or of being installed.

Example

The installation of the submarine cable is almost complete.

海底ケーブルのインストールはほぼ完了しています。

C2 adjective /ˌɪnˈekspɜːrt/

inexpert

未熟な

Meaning

not skilled or experienced; lacking expertise

Example

The inexpert handling of the machine caused several mistakes.

機械の未熟な扱いがいくつかのミスを引き起こした。

C1 adjective /ɪnˈveɪsɪv/

invasive

侵襲的

Meaning

Tending to spread harmfully, intruding aggressively, or encroaching beyond proper boundaries.

Example

The doctor explained that the procedure was minimally invasive.

医者は、その手順が最小限の侵襲的であることを説明しました。

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 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 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。

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。

C2 noun /ɪnˈkwɪzɪtər/

inquisitor

尋問者

Meaning

A person who asks many questions, often in an official or harsh manner.

Example

The inquisitor demanded detailed answers from the witness.

尋問者は証人から詳細な回答を要求しました。

B1 adjective ˌɪn.dɪˈpen.dənt

independent

独立

Meaning

Not depending on another for livelihood or subsistence; free from outside control; not subject to another's authority.

Example

An independent institution ensures transparency in governance.

独立した機関は、ガバナンスの透明性を保証します。

C1 adjective /ˌɪnɪkˈsplɪkəbl/

inexplicable

説明できない

Meaning

Impossible to explain or understand.

Example

The sudden disappearance of the file was inexplicable.

ファイルの突然の消失は説明できなかった。

C1 adjective /ˌɪnəˈtɛntɪv/

inattentive

不注意な

Meaning

not paying attention; lacking focus or concentration

Example

The inattentive student missed several important instructions.

不注意な学生は重要な指示をいくつも逃した。

C2 noun /ɪmˌprɒb.əˈbɪl.ə.ti/

Improbability

不確実性

Meaning

the quality or state of being improbable; unlikely to be true or to happen

Example

The improbability of winning the lottery twice didn't stop her from buying tickets.

ロトで二回連続で当選する可能性の低さは、彼女がチケットを買うのを止めませんでした。

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。

B2 noun ˌɪn.əˈveɪ.ʃən

innovation

革新

Meaning

The action or process of innovating; a new method, idea, product, etc.

Example

Innovation drives solutions to global challenges.

革新は世界的な課題への解決策を促進します。

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 noun /ˌɪn.trəˈvɜːr.ʒən/

introversion

内向

Meaning

The tendency to be inward-looking and shy, preferring solitary activities.

Example

Her introversion made it difficult for her to enjoy large parties.

彼女の内向的な性格は、大きなパーティーを楽しむのを難しくした。

B1 verb /ˌɪntərˈækt/

interact

交流する

Meaning

to communicate or work together with someone or something

Example

Students interact with teachers during class discussions.

学生は授業のディスカッション中に教師と交流します。

B2 verb /ˌɪntərˈfɪər/

interfere

幸せ

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.

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。

A1 adjective /ɪmˈpɔː.tənt/

important

重要

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.

汚染に対処するためには重要なステップを踏む必要があります。

C2 noun /ˈɪntəˌkrɒpɪŋ/

intercropping

間作農業

Meaning

The agricultural practice of cultivating two or more crops simultaneously in the same field to maximize land use efficiency and improve soil health.

Example

Intercropping can help improve soil fertility and pest control.

間作農業は土壌の肥沃度と害虫管理の向上に役立ちます。

A2 adjective ˌɪn.təˈnæʃ.ən.əl

international

国際的な

Meaning

Existing, occurring, or carried on between two or more nations and their citizens.

Example

International standards improve competitiveness.

国際基準は競争力を高めます。

C1 adjective /ɪnˈedəbəl/

Inedible

食べられない

Meaning

not suitable or safe for eating; not edible

Example

The mushrooms were poisonous and completely inedible.

そのキノコは毒性があり、完全に食べられないものでした。

B1 noun /ɪnˈstrʌkʃən/

instruction

指示

Meaning

Detailed information telling how something should be done or operated.

Example

Please read the instruction carefully before using the machine.

機械を使用する前に指示をよく読んでください。

B2 noun /ɪnˈsɪstəns/

insistence

強い要求

Meaning

the act of demanding something firmly or repeatedly

Example

At his insistence, we stayed longer.

彼の強い要求で、私たちは長く滞在しました。

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。

B1 noun ɪmˈpruːv.mənts

improvements

改善

Meaning

The action of making or becoming better; an instance of something becoming or being made better.

Example

Continuous improvements increase productivity.

継続的な改善は生産性を高めます。

C1 noun /ˌɪnɪkˈspɪəriəns/

inexperience

未経験

Meaning

Lack of knowledge or skill in a particular activity or field.

Example

His inexperience in handling negotiations was evident.

交渉における彼の未経験は明らかでした。

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。

C2 noun /ɪnˈdɛntʃər/

indenture

Meaning

A formal legal agreement, contract, or document, often relating to work or service.

Example

In the 18th century, many workers came under indenture to work overseas.

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 verb /ˈɪnkjʊˌbeɪt/

incubate

孵化する

Meaning

to keep eggs, cells, or organisms at the right conditions for development

Example

The hen will incubate the eggs until they hatch.

そのニワトリは卵が孵化するまでインキュベートします。

B2 adjective /ˈɪrɪteɪtɪd/

irritated

いらいらした

Meaning

feeling annoyed or impatient; having inflamed or sore physical condition

Example

She felt irritated by the constant noise outside her window.

窓の外の絶え間ない騒音に彼女はいらいらした。

C2 noun /ˈaɪ.kɒn/

ikon

宗教的な画像やシンボル

Meaning

A religious image or symbol, especially in the Eastern Orthodox Church.

Example

The church displayed a beautifully painted ikon of the Virgin Mary.

教会は美しく描かれた聖母マリアのアイコンを展示しました。

C1 adjective /ɪmˈpæsɪv/

impassive

無表情

Meaning

Not showing or feeling emotion; expressionless.

Example

Despite the shocking news, she remained impassive.

衝撃的なニュースにもかかわらず、彼女は無表情のままでした。

C1 adjective /ɪˈnɔːɡjərəl/

Inaugural

開幕

Meaning

marking the beginning of something; first; opening

Example

The president delivered his inaugural speech.

大統領は彼の開幕スピーチを行いました。

A1 noun /aɪˈdiː.ə/

Idea

アイデア; 概念; 提案

Meaning

a thought or suggestion as to a possible course of action; a concept or mental impression

Example

She had a brilliant idea for solving the company's efficiency problem.

彼女は会社の効率問題を解決するための素晴らしいアイデアを持っていました。

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。

C2 noun /ɪnˈfrækʃən/

infraction

違反

Meaning

A violation or breach of a rule, law, or agreement.

Example

The student was punished for a minor infraction of the school rules.

学生は学校の規則の軽微な違反で罰せられました。

C1 adjective /ɪnˈdʌktɪv/

inductive

帰納的

Meaning

characterized by the inference of general laws from particular instances; reasoning from specific cases to general principles

Example

The scientist used inductive reasoning to form a hypothesis.

科学者は帰納的推論を使って仮説を立てました。

B2 noun /ɪnˈfɪnɪti/

infinity

無限

Meaning

A concept describing something without any limit or end.

Example

The universe seems to stretch into infinity.

宇宙は無限に広がっているように見える。

C2 noun /ˌɪmpəˈtjuːəsəti/

impetuosity

衝動性

Meaning

The quality of being rash or impulsive.

Example

His impetuosity often got him into trouble.

彼の衝動性はしばしば彼を問題に巻き込んだ。

C1 adjective /ɪmˈpɜːrtɪnənt/

impertinent

無礼な

Meaning

rude and showing a lack of respect

Example

It was impertinent of him to question the manager's decision.

マネージャーの決定に疑問を呈するのは無礼でした。

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。

A2 noun /ˌɪn.trəˈdʌk.ʃən/

introduction

紹介

Meaning

the action of introducing something or someone; an opening or beginning part

Example

The professor gave a brief introduction before starting the lecture.

教授は講義を始める前に簡単なイントロダクションをしました。

C1 adjective /ɪˈnɒkjuəs/

innocuous

無害な

Meaning

Not harmful or offensive.

Example

His remark was completely innocuous and not meant to offend anyone.

彼の発言は完全に無害で、誰かを傷つける意図はなかった。

B2 verb /ɪnˈʃʊər/

insure

保険をかける

Meaning

to provide insurance; to make certain

Example

I need to insure my new car.

私は新しい車を保険に入れる必要があります。

C2 noun /ɪnˈɛrənsi/

inerrancy

無謬性

Meaning

the belief or quality of being free from error; absolute correctness

Example

Some religious groups strongly affirm the inerrancy of their sacred texts.

いくつかの宗教団体は、自分たちの聖典の誤りのなさを強く主張しています。

C1 noun /ɪnˈædɪkwəsi/

inadequacy

不十分さ

Meaning

lack of sufficient ability, quality, or strength; a feeling of not being good enough

Example

She struggled with feelings of inadequacy at work despite her strong qualifications.

十分な資格があるにもかかわらず、彼女は職場で不十分さを感じていた。

B2 verb /ɪmˈprɪzən/

imprison

投獄する

Meaning

to put someone in prison; to confine or restrict someone's freedom

Example

The judge imprisoned the criminal for five years.

裁判官は犯罪者を5年間投獄しました。

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 verb /ˌɪntəˈsɛkt/

intersect

交差する

Meaning

to cross or pass through each other

Example

The two roads intersect at the city center.

二つの道路は市内中心で交差する。

C1 adjective /ɪnˈsɒlvənt/

insolvent

破産

Meaning

unable to pay debts owed

Example

The insolvent firm could not meet its financial obligations.

破産した企業は財務義務を果たせなかった。

B2 noun /ɪnˈfek.ʃən/

Infection

感染

Meaning

the process of infecting or the state of being infected; a disease caused by germs

Example

The doctor prescribed antibiotics to treat the bacterial infection in her throat.

医師は彼女の喉の細菌感染を治療するために抗生物質を処方しました。

C1 noun /ɪnˈkɒmpɪtəns/

incompetence

無能

Meaning

Lack of ability, skill, or effectiveness in doing something.

Example

The project failed due to the manager’s incompetence.

プロジェクトはマネージャーの無能のため失敗しました。

C2 verb /ɪnˈdaɪt/

indite

作詞する

Meaning

To write or compose (literary or formal works).

Example

The poet indited a heartfelt sonnet.

詩人は心のこもったソネットを作詞した。

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。

C2 verb /ˈɪmprɪkeɪt/

imprecate

呪う

Meaning

To utter a curse or invoke evil upon someone.

Example

The old woman imprecated her enemies with dark words.

その年老いた女性は暗い言葉で敵を呪いました。

B2 verb /ɪnˈtriːɡ/

intrigue

魅了する

Meaning

to arouse curiosity or interest; to make someone fascinated

Example

The mystery novel will intrigue any reader.

ミステリー小説はすべての読者を魅了するでしょう。

B2 noun /ˈɪm.pʌls/

Impulse

衝動; 突然の欲求

Meaning

a sudden strong and unreflective urge or desire to act; a driving force or motivation

Example

She bought the expensive dress on impulse and later regretted the purchase.

彼女は衝動で高価なドレスを買い、後でその購入を後悔しました。

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。