inheritor
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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。
B2 verb /ɪnˈtɛnsɪfaɪ/

intensify

強化する
Meaning
To make something stronger, more extreme, or more forceful.
Example
The storm is expected to intensify overnight.
嵐は夜通し強くなると予想されています。
B1 adjective /ɪnˈtɜːrnəl/

internal

内部
Meaning
situated inside; relating to the inside or inner part of something
Example
The company is conducting an internal audit this month.
その会社は今月内部監査を行っています。
C1 noun /ˈɪnkjʊˌbeɪtər/

incubator

インキュベーター
Meaning
a device or environment that provides suitable conditions for eggs, cells, or infants to develop
Example
The premature baby was placed in an incubator for care.
未熟児はケアのためにインキュベーターに入れられました。
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。
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。
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。
C2 verb /ˈɪndjʊˌreɪt/

indurate

硬化する
Meaning
To harden or make something physically or emotionally tough.
Example
Years of hardship indurated his spirit.
長年の困難が彼の精神を鍛えました。
C2 noun /ˈɪnˌɡreɪt/

ingrate

Meaning
An ungrateful person; someone who shows no appreciation.
Example
He worked hard for his friend, but the ingrate never thanked him.
A2 noun/adjective /ˌɪndɪˈvɪdʒuəl/

individual

個人
Meaning
A single human being as distinct from a group; relating to one person.
Example
Each individual has the right to freedom of speech.
各個人には表現の自由がある。
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
B2 verb /ɪˈnɪʃieɪt/

initiate

開始する
Meaning
to begin or start; to introduce someone to a new activity
Example
The company will initiate a new training program.
会社は新しい研修プログラムを開始します。
B2 noun /ˈaɪrəni/

irony

皮肉
Meaning
a situation that is strange or amusing because it is the opposite of what is expected; the use of words to convey the opposite meaning
Example
The irony of the situation was that the winner forgot his own prize.
その状況の皮肉は、勝者が自分の賞を忘れたことでした。
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 adjective /ɪmˈpɛtʃ.u.əs/

impetuous

衝動的な
Meaning
Acting or done quickly and without thought or care; impulsive.
Example
His impetuous decision led to unexpected consequences.
彼の衝動的な決断は予想外の結果を招いた。
C2 verb /ɪmˈpjuːn/

impugn

Meaning
to dispute the truth, validity, or honesty of a statement or motive
Example
The lawyer tried to impugn the credibility of the witness.
C2 noun /ɪˌledʒ.əˈbɪl.ə.ti/

Illegibility

読みにくさ
Meaning
the quality of being impossible or difficult to read; unclear writing or print
Example
The doctor's handwriting was famous for its illegibility among the pharmacy staff.
医者の手書きは薬局のスタッフの間でその読みにくさで有名でした。
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。
B2 verb /ˈaɪ.sə.leɪt/

isolate

隔離する
Meaning
To separate something or someone from others.
Example
Doctors tried to isolate the patient to prevent the spread of infection.
医師たちは感染の拡大を防ぐために患者を隔離しようとしました。
B2 verb /ɪnˈspekt/

inspect

検査する
Meaning
to examine something carefully to check for problems or faults
Example
The engineer will inspect the building for structural damage.
エンジニアは建物の構造的な損傷を検査します。
C2 adjective ɪˈnɛfəbl

ineffable

言葉で表現できない
Meaning
Too great or extreme to be expressed or described in words.
Example
The beauty of the landscape was ineffable.
その景色の美しさは言葉で表現できなかった。
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。
C1 adjective /ɪˈnɜːrt/

inert

不活性
Meaning
lacking the ability or strength to move or act; chemically inactive
Example
The patient remained inert on the bed.
患者はベッドで動かずにじっとしていました。
C2 verb /ɪmˈbruː/

imbrue

汚す
Meaning
To stain, especially with blood.
Example
His hands were imbrued with blood after the battle.
戦いの後、彼の手は血で汚れていた。
C2 adjective /ˌɪmpɪˈkjuːniəs/

impecunious

貧乏
Meaning
Having little or no money; poor.
Example
He grew up in an impecunious family.
彼は貧乏な家族で育ちました。
B2 noun /ɪnˌtɜːrprəˈteɪʃən/

interpretation

解釈
Meaning
the action of explaining the meaning of something
Example
The teacher gave her own interpretation of the poem.
教師は詩の自分の解釈を示しました。
B2 adjective /ˌɪnkənˈsɪstənt/

inconsistent

一貫性がない
Meaning
Not staying the same throughout; lacking harmony or regularity.
Example
His answers were inconsistent and confusing.
彼の答えは一貫性がなく、混乱を招いた。
B2 verb /ɪnˈtɜːrprət/

interpret

Meaning
to explain the meaning of something; to translate orally
Example
She had to interpret the speech for the foreign guests.
C2 adjective /aɪˈtɪnərənt/

itinerant

旅する
Meaning
Traveling from place to place, especially for work or duty.
Example
The itinerant teacher moved from village to village to educate children.
その旅する教師は村から村へと移動して子供たちに教育をしていました。
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。
C2 adjective /ɪnˈdɛkərəs/

indecorous

不作法
Meaning
Not in keeping with good taste and propriety; improper.
Example
His indecorous behavior shocked the audience.
彼の不作法な振る舞いは観客を驚かせた。
B2 verb ɪmˈpoʊz

imposes

課す
Meaning
To establish or apply by authority; to force something unwelcome or unfamiliar to be accepted or put in place.
Example
Pollution imposes harmful effects on the environment.
汚染は環境に有害な影響を課します。
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 adjective /ɪnˈɔːdəbl/

inaudible

聞こえない
Meaning
Unable to be heard.
Example
Her voice was almost inaudible over the noise.
その音の中で彼女の声はほとんど聞こえなかった。
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 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 noun /ɪˌmædʒ.ɪˈneɪ.ʃən/

Imagination

想像力; 創造的思考
Meaning
the faculty or action of forming new ideas or images not present to the senses; creative thinking
Example
Children's imagination allows them to turn a cardboard box into a spaceship or castle.
子供たちのイマジネーションは、段ボール箱を宇宙船やお城に変えることを可能にします。
C1 noun /ˌɪnfɪˈdɛləti/

infidelity

不倫
Meaning
the act of being unfaithful to a spouse or partner
Example
Their marriage ended due to his infidelity.
彼らの結婚は彼の不倫が原因で終わった。
B2 verb /ɪnˈstrʌkt/

instruct

指示する
Meaning
to teach; to give directions
Example
The teacher instructed the students carefully.
先生は生徒に注意深く指示しました。
C2 noun /ɪmˈpʌlʃən/

impulsion

Meaning
a strong urge or drive to act; the act of impelling
Example
His impulsion to travel made him leave his job suddenly.
B2 adjective /ɪnˈækjərət/

Inaccurate

不正確; 間違っている; 誤り
Meaning
not correct; containing errors; wrong
Example
The weather forecast was inaccurate yesterday.
昨日の天気予報は不正確でした。
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。
B1 verb /ɪmˈprɛs/

impress

感動させる
Meaning
to cause someone to feel admiration or respect
Example
Her speech managed to impress the audience.
彼女のスピーチは聴衆を感動させました。
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。
B2 verb /ˈɪl.ə.streɪt/

illustrate

説明する
Meaning
to explain or make something clear by using examples, pictures, or comparisons
Example
The teacher used diagrams to illustrate the concept.
先生はその概念を説明するために図を使いました。
C1 verb /ɪnˈfleɪt/

inflate

膨らませる；水増しする
Meaning
to fill with air or gas so it expands; to increase excessively or artificially
Example
The mechanic inflated the tire to the correct pressure.
整備士はタイヤを適切な空気圧まで膨らませた。
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 adjective /ɪˈlɪt.ər.ət/

Illiterate

識字障害者; 読み書きができない; 無知
Meaning
unable to read or write; lacking education
Example
The program aims to help illiterate adults learn to read and write.
このプログラムは、識字率の低い成人が読み書きを学ぶ手助けをすることを目的としています。
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 /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。
C1 adjective /ɪmˈpjʊər/

Impure

不純
Meaning
contaminated; not clean; mixed with foreign substances
Example
The impure water caused health problems in the village.
不純な水は村で健康問題を引き起こしました。
C1 adjective /ˌɪnɔːrˈɡænɪk/

inorganic

無機の
Meaning
relating to substances that are not derived from living organisms; lacking organic structure or growth
Example
Inorganic compounds are commonly studied in chemistry labs.
無機化合物は化学の基本です。
C1 adjective /ɪmˈpɛndɪŋ/

impending

差し迫った
Meaning
about to happen soon, usually something unpleasant or threatening
Example
The villagers were worried about the impending flood.
村人たちは差し迫った洪水を心配していた。
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 adjective /ɪnˈvæljʊəbl/

invaluable

計り知れない価値がある
Meaning
Extremely useful or indispensable.
Example
Her advice proved invaluable to my success.
彼女の助言は私の成功にとって非常に貴重でした。
B1 noun ˌɪndɪˈpendəns

independence

独立
Meaning
The fact or state of being independent; freedom from outside control; not being subject to another's authority.
Example
Independence inspired the movement.
独立は運動を刺激した。
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。
B2 adjective /aɪˈdentɪkəl/

Identical

同一の; 全く同じ
Meaning
exactly the same; not different in any way
Example
The twins look completely identical to each other.
双子は完全に同じに見えます。
C1 verb /ˌɪn.tɚˈtwaɪn/

intertwine

密接に接続またはリンクする; 一緒にねじるまたは密接に結合する
Meaning
To connect or link closely; to twist together or combine closely.
Example
Their lives became intertwined through years of friendship.
彼らの生活は長年の友情を通じて絡み合った。
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。
C2 adjective /ɪmˈplaɪəbl/

impliable

暗示可能な
Meaning
Capable of being implied or suggested.
Example
The meaning of the statement is not directly clear but is impliable from the context.
その声明の意味は直接的には明確ではないが、文脈から推測可能である。
C1 adjective /ˌɪməˈtɪəriəl/

immaterial

無関係
Meaning
Not important or relevant; lacking physical substance.
Example
The judge ruled that the argument was immaterial to the case.
裁判官はその議論が事件に関係ないと判断しました。
B1 adjective ɪnˈdʌs.tri.əl

industrial

工業的な
Meaning
Relating to or characterized by industry.
Example
Industrial sectors boost exports.
工業部門は輸出を促進する。
C2 adjective /ˌɪrɪˈmiːdiəbl̩/

irremediable

修復不可能
Meaning
Impossible to cure, repair, or remedy.
Example
The damage to the ancient manuscript was irremediable.
古代の写本への損傷は修復不可能でした。
C2 adjective /ˌɪmpəˈmɪsəbl/

impermissible

許可されていない
Meaning
Not permitted or allowed.
Example
Such behavior is impermissible in the workplace.
そのような行動は職場では許可されていません。
C2 adjective /ɪˈlɪbərəl/

illiberal

非リベラル
Meaning
Opposed to liberal principles; restricting freedom of thought or behavior.
Example
The government was criticized for its illiberal policies.
政府はその非リベラルな政策について批判された。
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 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。
B2 noun /ˈaɪ.dəl/

Idol

偶像; 崇拝される人物
Meaning
an image or representation of a god used as an object of worship; a person who is greatly admired
Example
The singer became a teenage idol after her hit song topped the charts worldwide.
その歌手はヒットソングが世界中のチャートで1位に達した後、ティーンエイジャーのアイドルとなった。
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。
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。
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。
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。
C1 noun /ɪnˈvɜːrʒən/

inversion

逆転
Meaning
A reversal of the normal order, position, or relationship.
Example
In poetry, inversion is often used to create emphasis.
詩では、逆転は強調を作るためによく使われます。
C2 adjective /ˌɪn.trəˈsɛl.jʊ.lər/

intracellular

細胞内
Meaning
Located or occurring within a cell.
Example
The drug works by targeting intracellular bacteria.
薬は細胞内の細菌をターゲットにして作用します。
C2 noun /ˌɪntərˈsɛsər/

intercessor

仲介者
Meaning
a person who intervenes or pleads on behalf of another
Example
He acted as an intercessor to resolve the conflict between the two families.
彼は二つの家族間の対立を解決するために仲介者として行動しました。
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 /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 /ˌɪnɪkˈskjuːzəbl/

inexcusable

許しがたい
Meaning
Too bad to be justified or overlooked; unforgivable.
Example
His rude behavior was inexcusable.
彼の無礼な行動は許しがたいものでした。
C1 adjective /ɪmˈpɜːrviəs/

impervious

透過しない
Meaning
Not allowing fluid to pass through; unable to be affected by something.
Example
The jacket is impervious to rain.
ジャケットは雨に透過しません。
C1 adjective /ˈɪrɪtəbl/

irritable

Meaning
easily annoyed or made angry
Example
She became irritable after working long hours without rest.
C1 adjective /ˌɪnkəmˈpætəbl/

incompatible

互換性がない
Meaning
Not able to exist or work together without conflict.
Example
Their personalities were completely incompatible.
彼らの性格は完全に互換性がなかった。
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。
B2 adjective /ˈɪɡ.nər.ənt/

Ignorant

無知
Meaning
lacking knowledge or awareness; uninformed
Example
She was ignorant about the new technology trends.
彼女は新しい技術のトレンドについて無知でした。
C1 adjective /ˌɪnsɪˈdɛntəl/

incidental

付随的
Meaning
happening as a minor part or in connection with something else
Example
Incidental expenses like snacks and tips were included in the bill.
スナックやチップのような付随的な費用は請求書に含まれていました。
C2 noun /ˈænʒənuː/

ingenue

無邪気な若い女性
Meaning
an innocent, naïve young woman, especially as represented in literature or theater
Example
She played the role of the ingénue in the play with great charm.
彼女は劇で無邪気な若い女性の役を演じ、大きな魅力を発揮しました。
B1 verb /ˈɪndʒər/

injure

怪我をさせる
Meaning
to cause physical harm or damage to someone or something
Example
He injured his leg while playing football.
彼はサッカーをしている時に足を怪我した。
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。
C2 adjective /ˌɪnkoʊˈɜːrsəbl̩/

incoercible

強制できない
Meaning
Not capable of being forced, compelled, or restrained.
Example
Her incoercible spirit inspired others to fight for justice.
彼女の強制できない精神は他の人々に正義のために戦うようにインスパイアした。
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。
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。
C1 verb /ɪnˈvɜːrt/

invert

逆さにする
Meaning
To turn something upside down or in the opposite position, order, or direction.
Example
He inverted the glass to let the water drain out.
彼は水が流れ出るようにグラスを逆さまにしました。
C1 adjective /ɪnˈtræk.tə.bəl/

intractable

管理不能
Meaning
Difficult or impossible to manage, control, or solve.
Example
The conflict has become an intractable problem.
その対立は管理不能な問題になった。
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 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。
C2 adjective /ɪnˈskruːtəbl̩/

inscrutable

幸福
Meaning
impossible to understand or interpret
Example
His inscrutable expression made it hard to know what he was thinking.
彼女は賞を受け取ったとき、幸せを隠すことができませんでした。
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 /ɪnˈsɛnʃənt/

insentient

無感覚の
Meaning
Lacking perception, consciousness, or sensation.
Example
The rock is an insentient object with no awareness.
岩は意識のない無感覚の物体です。
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。
C1 noun /ɪnˈfɜː.mə.ti/

Infirmity

虚弱; 病気; 衰弱
Meaning
physical or mental weakness; a disease or ailment; frailty
Example
Despite his advanced age and various infirmities, he remained mentally sharp and alert.
高齢で多くの病気を抱えていても、彼は精神的に鋭く、警戒心を持ち続けました。
C2 verb ˈɪnʌndeɪt

inundate

洪水で満たす、処理すべき事柄や人々で誰かまたは何かを圧倒する
Meaning
To flood; overwhelm someone or something with things or people to be dealt with
Example
The company was inundated with requests after the advertisement.
広告の後、会社はリクエストで圧倒されました。
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。
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。
C1 noun /ˈaɪsətəʊp/

isotope

同位体
Meaning
Atoms of the same element with equal number of protons but different numbers of neutrons.
Example
Carbon-14 is a radioactive isotope used in dating fossils.
炭素-14は化石の年代を測定するために使用される放射性同位体です。
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。
B2 adjective ˈɪn.tɪ.ɡrəl

integral

不可欠
Meaning
Necessary to make a complete whole; essential or fundamental.
Example
Exercise is an integral part of a healthy lifestyle.
運動は健康的なライフスタイルの不可欠な部分です。
C1 verb /ɪmˈpɛl/

impel

Meaning
to drive, force, or urge someone to do something
Example
Her curiosity impelled her to open the mysterious box.
B2 noun, verb /ˌɪnkənˈviːniəns/

inconvenience

不便
Meaning
trouble or difficulty caused to someone; to cause trouble or difficulty to someone
Example
We apologize for any inconvenience caused by the delay.
遅延によって生じた不便についてお詫びします。
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 noun ɪnˌdʌstrɪəlaɪˈzeɪʃən

industrialization

産業化
Meaning
The development of industries in a country or region on a wide scale.
Example
Industrialization changed the global economy dramatically.
産業化は世界経済を劇的に変えました。
C1 adjective ɪˈneɪt

Innate

生まれつきのまたは自然の
Meaning
Existing from birth or natural
Example
She has an innate talent for music.
彼女は音楽において生まれつきの才能を持っている。
C1 adjective ɪn ˈfleɪ.ʃə.ner.i

inflationary

インフレ的
Meaning
Characterized by or tending to cause monetary inflation; relating to rising prices.
Example
The government took measures to control inflationary pressures.
政府はインフレ圧力を制御するために措置を講じた。
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。
C2 noun /ˈɪd.i.ə.si/

Idiocy

愚かさ
Meaning
extremely stupid behavior or actions; foolishness
Example
The decision to ignore safety protocols was pure idiocy that endangered everyone.
安全プロトコルを無視する決定は、すべての人を危険にさらす純粋な愚かさでした。
C1 verb /ɪnˈtɪmɪdeɪt/

intimidate

Meaning
To frighten or overawe someone, especially to make them do what one wants.
Example
The bully tried to intimidate the smaller kids.
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。
B2 adjective /ɪmˈpɜːrfɪkt/

imperfect

不完全
Meaning
Not perfect; having faults or flaws.
Example
The painting was beautiful despite being imperfect.
その絵は美しかったが、完璧ではなかった。
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。
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 noun /ɪˈmɒdəsti/

immodesty

不謹慎
Meaning
lack of modesty or decency; behavior or attitude that is overly bold or improper
Example
The article was criticized for its tone of immodesty.
その記事は不謹慎な語調で批判された。
C1 noun /ˈɪn.trə.vɜːrt/

introvert

内向的
Meaning
A person who tends to be shy and prefers spending time alone rather than in groups.
Example
As an introvert, he preferred reading over attending parties.
内向的な性格として、パーティに参加するよりも読書の方が好きでした。