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。

B1 noun /ɪnˌvɛs.tɪˈɡeɪ.ʃən/

investigation

調査

Meaning

the process of inquiring into or examining something carefully to find the truth

Example

The investigation revealed new evidence about the fraud.

調査は詐欺に関する新しい証拠を明らかにしました。

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。

B2 adverb /ɪmˈpɔːtəntli/

importantly

重要な方法で

Meaning

in a way that is of great significance or value

Example

Importantly, the report highlights the need for immediate action.

重要な方法で、報告書は即時の行動の必要性を強調しました。

C2 adjective /ˌɪndɪˈtɜːrmənət/

indeterminate

不確定

Meaning

Not exactly known, defined, or established; vague or uncertain.

Example

The project was delayed for an indeterminate amount of time.

プロジェクトは不確定な期間に延期されました。

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。

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。

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。

B2 noun /ɪmˈpeɪʃəns/

impatience

忍耐力不足

Meaning

The state of being quickly irritated or unable to wait calmly.

Example

His impatience grew as the meeting dragged on.

会議が長引くにつれて、彼の忍耐力不足が増しました。

C2 verb /ˈɪŋkʌlpeɪt/

inculpate

非難する

Meaning

To blame or accuse someone of wrongdoing.

Example

The evidence seemed to inculpate the suspect in the crime.

証拠は容疑者を犯行に巻き込んでいるように見えた。

C1 noun /ɪmˈpɒs.tər/

Impostor

詐欺師; 偽者

Meaning

a person who pretends to be someone else in order to deceive others; a fraud

Example

The impostor convinced everyone he was a doctor until his fake credentials were discovered.

詐欺師は医者だとみんなを納得させましたが、彼の偽の資格が発覚するまでそれが続きました。

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。

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。

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。

C2 adjective /ɪnˈkɒŋɡruənt/

incongruent

不一致な

Meaning

Not in harmony or keeping with the surroundings or other aspects.

Example

His casual outfit looked incongruent at the formal dinner.

彼のカジュアルな服装は正式なディナーで不一致に見えた。

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。

C1 noun/verb /ˈɪmprɪnt/

imprint

刻印

Meaning

A mark or impression made by pressure; to establish or fix firmly in someone's mind.

Example

The event left an indelible imprint on the city's history.

その出来事は都市の歴史に消えない刻印を残した。

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。

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。

C2 noun /ˌɪnsjəˈlærəti/

insularity

島国性

Meaning

The state of being isolated or narrow-minded.

Example

The insularity of the group prevented them from accepting new ideas.

グループの島国性は新しいアイデアを受け入れることを妨げた。

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。

C2 adverb /ɪnˈdjuːbɪtəbli/

indubitably

疑いなく

Meaning

Without a doubt; certainly.

Example

She is indubitably the best candidate for the job.

彼女は疑いなくその仕事の最良の候補者です。

C1 verb /ɪmˈbɛd/

imbed

埋め込む

Meaning

To fix firmly or deeply in a surrounding mass.

Example

The journalist imbedded himself with the troops to report firsthand.

ジャーナリストは部隊に埋め込まれて、最前線から報告を行った。

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。

B2 verb /ɪnˈhæbɪt/

inhabit

住む

Meaning

to live in; to occupy as a dwelling

Example

Many animals inhabit the forest.

多くの動物が森に住んでいます。

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。

C2 noun /ˌɪnədˈvɜːrtəns/

inadvertence

不注意

Meaning

Failure to pay attention; carelessness.

Example

The error happened through sheer inadvertence.

エラーは単なる不注意で発生しました。

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。

C1 noun ˌɪm.pʌlˈsɪv.ɪ.ti

impulsivity

衝動性

Meaning

The tendency to act quickly and without thought or care; lack of self-control.

Example

His impulsivity led him to make reckless choices.

彼の衝動性は、無謀な選択をさせた。

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。

C2 adjective /ɪnˈfɜːrnəl/

infernal

地獄の

Meaning

relating to hell; extremely troublesome or annoying

Example

The workers complained about the infernal noise from the construction site.

労働者たちは建設現場からの地獄のような騒音について文句を言った。

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 noun /ˌɪntərˌɒpərəˈbɪləti/

interoperability

相互運用性

Meaning

The ability of computer systems or software to exchange and make use of information.

Example

The interoperability of different software systems ensures seamless workflow.

異なるソフトウェアシステムの相互運用性は、シームレスな作業の流れを確保します。

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。

B2 adjective /ɪnˈvɪz.ə.bəl/

Invisible

見えない

Meaning

unable to be seen; not visible to the eye

Example

The bacteria are invisible without a microscope.

細菌は顕微鏡なしでは見えません。

C2 adjective /ɪnˈkɑːdʒɪtənt/

incogitant

無思慮な

Meaning

Lacking thought; inconsiderate or thoughtless.

Example

It was incogitant of him to make such a rude comment.

彼がそんな失礼なコメントをするのは無思慮なことでした。

A2 verb /ˌɪntrəˈduːs/

introduce

紹介する

Meaning

to present someone; to bring in for the first time

Example

Let me introduce you to my friend.

友達を紹介させてください。

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。

B2 adjective /ˌɪnstɪˈtjuːʃənl/

institutional

制度的

Meaning

Relating to an organization or established practice.

Example

The government made several institutional reforms in education.

政府は教育においていくつかの制度的改革を実施しました。

C1 noun /ˌɪnækˈtɪvɪti/

inactivity

不活動

Meaning

the state of not being active physically or mentally; lack of action

Example

Prolonged inactivity can negatively affect both physical and mental health.

長期間の不活動は身体的および精神的健康に悪影響を与えます。

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 /ˌɪnkænˈteɪʃən/

incantation

呪文

Meaning

a series of words used as a magic spell or charm

Example

The wizard chanted an incantation to summon the spirits.

魔法使いは霊を呼び出すために呪文を唱えました。

C1 noun /ɪnˈdʒʌŋkʃən/

injunction

差止命令

Meaning

A judicial order restraining a person from an action or compelling a certain act.

Example

The court issued an injunction to stop the company from polluting the river.

裁判所は、会社が河川を汚染するのを防ぐために差止命令を出した。

B2 adverb /ɪmˈpɒlɪtli/

impolitely

無礼に

Meaning

in a rude or discourteous manner; without showing respect or proper manners

Example

He spoke impolitely to the waiter despite the polite service.

丁寧なサービスにもかかわらず、彼は無礼にウェイターに話した。

C2 adjective /ˌaɪ.kə.nəˈklæs.tɪk/

iconoclastic

確立された信念、伝統、または価値観に対して攻撃的または拒絶的な特徴

Meaning

Characterized by attacking or rejecting cherished beliefs, traditions, or established values.

Example

Her iconoclastic views challenged the conventional wisdom of the industry.

彼女のアイコノクラスティックな見解は業界の従来の知恵に挑戦した。

A2 verb /ɪnˈvaɪt/

invite

招待する

Meaning

to ask someone to come to an event or to do something

Example

We should invite all our friends to the party.

パーティーに友達を招待するべきです。

B1 noun ɪnˈvestmənt

investment

投資

Meaning

The action or process of investing money for profit or material result.

Example

Investment in waste management infrastructure is essential.

廃棄物管理インフラへの投資は不可欠です。

C2 adjective /ˌɪnsəˈprɛsəbl/

insuppressible

抑制できない

Meaning

That cannot be suppressed or restrained.

Example

She had an insuppressible urge to laugh during the ceremony.

式の間、彼女は抑制できない笑いをこらえていた。

C1 noun /ˈɪm.pæs/

impasse

行き詰まり

Meaning

A situation where no progress is possible.

Example

The negotiations reached an impasse, delaying the agreement.

交渉は行き詰まり、合意が遅れた。

C2 verb /ɪˈnjʊər/

inure

慣れる

Meaning

To become accustomed to something, especially something unpleasant.

Example

Soldiers quickly became inured to the harsh conditions.

兵士たちはすぐに過酷な状況に慣れました。

B2 verb /ˈɪr.ɪ.teɪt/

irritate

イライラさせる

Meaning

To make someone annoyed or angry; to cause discomfort or inflammation.

Example

Rubbing your eyes can irritate them.

目をこすると、それが刺激になることがあります。

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。

B2 verb /ˈɪmɪteɪt/

imitate

真似る

Meaning

to copy the behavior or manner of someone or something

Example

Children often imitate their parents' behavior.

子供たちはしばしば親の行動を真似します。

B2 noun /ˌɪnstəˈbɪləti/

instability

不安定

Meaning

lack of stability or balance; tendency to change, fail, or collapse easily

Example

Political instability has slowed economic growth in the region.

政治的な不安定さが地域の経済成長を遅らせた。

B1 noun /ˈɪn.flu.əns/

Influence

影響; 力

Meaning

the capacity to have an effect on the character, development, or behavior of someone or something

Example

The teacher's positive influence helped the student overcome his learning difficulties.

教師の積極的な影響が生徒の学習の問題を克服する手助けをしました。

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。

B1 noun /ɪnˈɡriːdiənt/

ingredient

材料

Meaning

A component part or element of something, especially in a recipe.

Example

Flour is a key ingredient in baking bread.

小麦粉はパン作りにおける重要な材料です。

C1 verb /ɪmˈpɪndʒ/

impinge

影響を与える

Meaning

to have an effect or impact on something; to encroach or infringe

Example

The noise from the construction site impinges on our daily activities.

建設現場の音は私たちの日常的な活動に影響を与えます。

C2 verb /aɪˈdɒləˌtraɪz/

idolatrize

偶像崇拝

Meaning

To worship idols; to regard with excessive devotion or admiration.

Example

They began to idolatrize the statue as a deity.

彼らはその像を神として崇拝し始めました。

A2 preposition /ɪnˈkluːdɪŋ/

including

含む

Meaning

used to show that someone or something is part of a larger group

Example

Many people attended the event, including students and teachers.

多くの人々がイベントに参加しました、学生や教師を含む。

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 /ˈɪntrɪkət/

intricate

複雑

Meaning

very detailed, complex, and difficult to understand

Example

The artist created an intricate pattern on the wall.

アーティストは壁に複雑な模様を作り出しました。

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。

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 verb /ɪnˈstɪl/

instill

植え付ける

Meaning

to gradually but firmly establish an idea, attitude, or habit in someone's mind

Example

Parents try to instill good values in their children.

親は子供に良い価値観を植え付けようとしています。

B2 noun /ˈɪn.flu.ən.sər/

Influencer

インフルエンサー, 商品を勧める人

Meaning

A person with the ability to influence potential buyers of a product or service by promoting or recommending the items on social media.

Example

Social media influencers shape consumer preferences.

ソーシャルメディアのインフルエンサーは消費者の好みを形作っています。

C2 adjective ˌɪm.pəˈtɜː.bə.bəl

imperturbable

冷静沈着

Meaning

Unable to be upset or excited; not easily disturbed.

Example

His imperturbable nature made him a great leader.

彼の冷静沈着な性格は、彼を偉大なリーダーにした。

B1 adjective /ɪˈliː.ɡəl/

illegal

違法

Meaning

Not allowed by law; unlawful.

Example

It is illegal to drive without a valid license.

有効な免許なしで運転することは違法です。

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。

C1 noun /ˌɪnˈdɪsəplɪn/

indiscipline

規律の欠如

Meaning

lack of discipline or self-control; failure to obey rules or maintain order

Example

Indiscipline among the students disrupted the learning environment.

学生の規律の欠如が学習環境を乱した。

C1 adjective /ɪnˈhɪbɪtɪd/

inhibited

抑制された

Meaning

Unable to act in a relaxed and natural way, especially due to self-consciousness or restraint.

Example

He was too inhibited to express his true feelings.

彼は自分の本当の感情を表現するにはあまりにも抑制されていた。

C1 noun /ɪnˈfɜːrnoʊ/

inferno

火災

Meaning

a large, intense fire that is dangerously out of control

Example

The building turned into an inferno within minutes.

その建物は数分で火災に変わった。

C1 adjective /ɪnˈæk.tɪv/

Inactive

非アクティブ

Meaning

not active; not working; dormant; idle

Example

The volcano has been inactive for over a century.

この火山は1世紀以上も活動していない。

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 /ɪɡˈnoʊ.bəl/

Ignoble

卑劣; 恥ずべき; 不名誉

Meaning

dishonorable; not noble in character; base or mean

Example

His ignoble actions betrayed his friends' trust.

彼の卑劣な行動は友人たちの信頼を裏切った。

C2 verb /ɪnˈveɪ/

inveigh

激しく批判する

Meaning

To speak or write about something with great hostility and criticism.

Example

He inveighed against the corruption in government.

彼は政府の腐敗に対して激しく批判した。

B2 noun /ɪnˈtɜː.prə.tər/

Interpreter

通訳者; 翻訳者;

Meaning

a person who translates orally from one language into another; someone who explains meaning

Example

The international conference hired professional interpreters to translate speeches in real time.

国際会議は、スピーチをリアルタイムで翻訳するためにプロの通訳者を雇いました。

B2 noun ˈɪndɪkeɪtə

indicator

指標

Meaning

A thing that indicates the state or level of something.

Example

The unemployment rate is a key indicator of economic health.

失業率は経済の健康の重要な指標です。

A2 noun /ˈaɪtəm/

item

アイテム

Meaning

A single thing, object, or unit, often part of a list or collection.

Example

Each item on the list must be checked carefully.

リストの各アイテムは慎重にチェックする必要があります。

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。

B2 adjective /ɪˈmjuːn/

immune

免疫の

Meaning

protected from disease or from the effects of something

Example

Children who are vaccinated are immune to many diseases.

予防接種を受けた子供たちは多くの病気に免疫があります。

C2 noun /ɪnˈtræn.sɪ.dʒəns/

intransigence

不屈

Meaning

Refusal to change one's views or to agree about something.

Example

The negotiations failed due to the intransigence of both parties.

両者の不屈の姿勢のために交渉は失敗した。

C2 adjective /ɪnˈsuːsiənt/

insouciant

無頓着

Meaning

Showing a casual lack of concern; carefree.

Example

He gave an insouciant shrug and walked away.

彼は無頓着に肩をすくめて、歩き去った。

B1 noun /ɪnˈvɛstər/

investor

投資家

Meaning

a person or organization that puts money into financial schemes, property, or business ventures with the expectation of achieving a profit

Example

The investor funded the startup with a large sum of money.

投資家はスタートアップに大金を投資しました。

不十分

Meaning

Not enough; inadequate.

Example

His explanation was insufficient to clear the confusion.

彼の説明は混乱を解消するには不十分でした。