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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。
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。
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。
C2 adjective /ˌɪntərˈlɒkjətəri/

interlocutory

仮の
Meaning
Given during the course of a legal action, not final but temporary or provisional.
Example
The judge issued an interlocutory order to maintain the status quo until the hearing.
裁判官は聴聞会まで現状を維持するために仮の命令を出しました。
C2 adjective /ˌɪnkænˈdɛsənt/

incandescent

白熱
Meaning
emitting light as a result of being heated; extremely bright or passionate
Example
The incandescent lamp lit up the entire hall.
白熱灯はホール全体を照らしました。
C1 noun /ˌɪntərˈmiːdiˌɛri/

intermediary

仲介者
Meaning
A person who acts as a link between people in order to try to bring about an agreement; a mediator.
Example
The diplomat served as an intermediary between the two conflicting nations.
外交官は二つの対立する国々の間で仲介者として機能した。
C2 adjective /ˌɪnɪkˈstɛnsəbl/

inextensible

伸縮不可
Meaning
Not capable of being stretched or extended.
Example
This rope is made of an inextensible material.
このロープは伸縮不可の材料でできています。
B1 noun ɪˈnɪʃətɪv

initiative

イニシアティブ
Meaning
An act or strategy intended to resolve a difficulty or improve a situation; a fresh approach to something.
Example
NASA's initiative to return humans to the Moon is ambitious.
NASAの月面への人類を戻すイニシアティブは野心的です。
C1 adjective /ɪmˈpæʃənd/

impassioned

情熱的な
Meaning
Filled with or showing great emotion.
Example
She gave an impassioned speech about human rights.
彼女は人権について情熱的なスピーチを行いました。
C1 adjective /ɪnˈdʌldʒənt/

indulgent

寛容な
Meaning
Having a tendency to be overly generous or lenient with someone.
Example
The indulgent mother allowed her child to stay up late.
寛容な母は子供を遅くまで起きていることを許しました。
C2 noun /ɪnˈɡrætɪˌtjuːd/

ingratitude

恩知らず
Meaning
Lack of gratitude; failure to show thanks or appreciation.
Example
His ingratitude hurt her feelings after all she had done for him.
彼の恩知らずは、彼女が彼のために多くのことをした後、彼女の気持ちを傷つけた。
C2 adjective /ɪnˈklɛmɛnt/

inclement

悪天候
Meaning
unpleasantly cold, wet, or stormy (usually weather)
Example
The match was canceled due to inclement weather.
試合は悪天候のためキャンセルされました。
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。
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。
C1 adjective /ɪnˈtjuː.ɪ.tɪv/

intuitive

直感的
Meaning
Based on instinctive understanding rather than reasoning.
Example
The software has an intuitive design that makes it easy to use.
そのソフトウェアは直感的なデザインを持っており、使いやすいです。
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。
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。
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 /ɪnˈstrʌktɪv/

instructive

教育的
Meaning
useful and informative; providing knowledge or instruction
Example
The lecture was highly instructive and engaging.
その講義は非常に教育的で魅力的でした。
C1 noun /ɪmˈpɜː.mə.nəns/

impermanence

無常
Meaning
The state or fact of lasting for only a limited period of time.
Example
The philosophy of Buddhism emphasizes the impermanence of life.
仏教の哲学は、人生の無常性を強調します。
C1 adverb /ˈɪnwərdli/

inwardly

内面的に
Meaning
In the mind or spirit; not outwardly visible.
Example
She smiled outwardly but inwardly she was worried.
彼女は外見では微笑んだが、内心では心配していた。
C2 noun /ɪˈnɪkwɪti/

iniquity

不正
Meaning
Immoral or grossly unfair behavior.
Example
The dictator's regime was marked by corruption and iniquity.
独裁者の政権は腐敗と不正で特徴づけられていました。
C1 noun (plural) /ˈɪndɪˌsiːz/

indices

インデックス
Meaning
plural form of index; statistical measures or reference points used for comparison
Example
Stock market indices fell sharply after the announcement.
発表後、株式市場のインデックスは急落しました。
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 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 /ɪˈnɛpt/

inept

不器用
Meaning
lacking skill or ability; clumsy or incompetent
Example
His inept handling of the situation made it worse.
彼の不器用な状況の対処が状況を悪化させた。
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 adjective ˌɪn.təˈræk.tɪv

interactive

インタラクティブ
Meaning
Allowing a two-way flow of information between it and a user, responding to the user's input.
Example
Interactive learning keeps students engaged in lessons.
インタラクティブな学習は、学生が授業に参加し続けるのを助けます。
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 /ˌɪn.strəˈmɛn.təl.ɪst/

instrumentalist

楽器奏者
Meaning
A person who plays a musical instrument.
Example
The instrumentalist played a beautiful solo on the violin.
楽器奏者はバイオリンで美しいソロを演奏しました。
B2 adjective /ˌɪnɪˈfɪʃənt/

Inefficient

非効率的
Meaning
not achieving maximum productivity; wasteful of time or resources
Example
The old computer system was inefficient and wasted a lot of time.
古いコンピュータシステムは非効率的で、多くの時間を無駄にしました。
C1 adjective /ˈɪmpjəd(ə)nt/

impudent

無礼な、厚かましい
Meaning
not showing due respect for another person; rude
Example
The impudent child talked back to the teacher.
その無礼な子供は先生に逆らった。
B2 noun /ˈɪntərfeɪs/

interface

インターフェイス
Meaning
a point where two systems, subjects, or organizations meet and interact
Example
The user interface is designed to be intuitive and user-friendly.
ユーザーインターフェイスは直感的で使いやすく設計されています。
B2 verb /ˈɪntɪɡreɪt/

integrate

統合する
Meaning
To combine or bring together into a unified whole.
Example
The new system integrates data from multiple sources.
新しいシステムは複数のソースからデータを統合します。
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。
C1 adjective /ˈɪnbɔːrn/

Inborn

生まれつきの; 生来の; 内在的な
Meaning
existing from birth; natural; inherent
Example
She has an inborn talent for music.
彼女は音楽のための生まれつきの才能を持っています。
C1 noun /ɪˈnɜː.ʃə/

Inertia

慣性; 活動の欠如
Meaning
a tendency to do nothing or remain unchanged; lack of activity or movement
Example
The team's inertia prevented them from adapting to the rapidly changing market conditions.
チームの慣性は、急速に変化する市場の状況に適応するのを妨げました。
C2 adjective /ˌɪnˌɑːpərˈtuːn/

inopportune

タイミングが悪い瞬間
Meaning
Happening at a bad or inconvenient time.
Example
His call came at the most inopportune moment.
彼の電話は最もタイミングが悪い瞬間にかかってきた。
C2 noun /ˈaɪdlər/

idler

怠け者
Meaning
A person who avoids work or spends time lazily.
Example
He was known as an idler who wasted his days.
彼は自分の時間を無駄にするアイドラーとして知られていました。
C1 noun ˌɪnˈsaɪtfʊlnɪs

insightfulness

洞察力、分析能力
Meaning
The capacity to gain an accurate and deep intuitive understanding of a person or thing.
Example
His insightfulness helped solve the complex problem.
彼の洞察力は複雑な問題を解決するのに役立ちました。
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 /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。
C1 noun /ɪmˌpɜː.sənˈeɪ.ʃən/

impersonation

なりすまし
Meaning
The action of pretending to be another person for the purpose of entertainment or fraud.
Example
Online impersonation is a serious cybercrime.
オンラインでのなりすましは重大なサイバー犯罪です。
B2 verb /ˌɪntərˈviːn/

intervene

介入する
Meaning
To come between people, groups, or events, often to prevent conflict or improve a situation.
Example
The teacher had to intervene to stop the fight between the students.
教師は生徒たちの間で喧嘩を止めるために介入しなければならなかった。
C1 verb /ɪnˈterəˌɡeɪt/

interrogate

尋問する
Meaning
to ask someone questions in a thorough and formal way; to question intensively
Example
The police interrogated the suspect for hours.
警察は容疑者を何時間も尋問した。
B1 noun /ˈɪnkʌm/

income

収入
Meaning
money received for work or through investments
Example
His monthly income is enough to support his family.
彼の月収は家族を支えるのに十分です。
C2 noun (compound/erroneous entry) /ɪnˈɛksərəbl ɑːrmi/

inexorableinexorablearmy

止められない軍隊
Meaning
This appears to be a corrupted or concatenated form; interpreted as 'inexorable army' — an unstoppable or relentless force.
Example
The rebels feared the inexorable army approaching their stronghold.
反乱軍は自分たちの砦に近づいてくる止められない軍隊を恐れていた。
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 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。
C2 noun /ˈaɪsinəs/

iciness

冷たさ
Meaning
The state of being cold in manner or temperature.
Example
There was a distinct iciness in his voice.
彼の声には明確な冷たさがあった。
B2 adjective ˈɪn.tɪ.ɡreɪ.tɪd

integrated

統合された
Meaning
Combining or coordinating separate elements so as to provide a harmonious, interrelated whole.
Example
Integrated systems optimize efficiency.
統合されたシステムは効率を最適化します。
B2 adjective/noun /ɪˈrɑːki/

iraqi

イラクの
Meaning
relating to Iraq or its people
Example
The Iraqi culture is rich and diverse.
イラクの文化は豊かで多様です。
C2 noun /ɪnˈsaɪzər/

incisor

切歯
Meaning
a narrow-edged tooth at the front of the mouth, adapted for cutting
Example
The dentist noted that his upper left incisor was chipped.
歯科医は彼の上の左側の切歯が欠けていることに気づきました。
C2 adjective /ɪnˈsɛptɪv/

inceptive

初期の
Meaning
Relating to or marking the beginning or initial stage of something.
Example
The inceptive phase of the project was marked by enthusiastic planning.
プロジェクトの開始段階は熱心な計画で特徴づけられました。
B2 adjective /ˌɪnsɪˈkjʊə/

insecure

不安定
Meaning
not confident or assured; uncertain and anxious
Example
She felt insecure about her performance in the exam.
彼女は試験での自分のパフォーマンスに不安を感じていました。
C2 noun /ˌɪkθiˈɒlədʒɪst/

ichthyologist

魚類学者
Meaning
A scientist who studies fish.
Example
The ichthyologist discovered a new species of fish in the river.
魚類学者は川で新しい魚の種を発見しました。
C2 adjective /ˌɪrɪˈkɒnsɪləbl/

irreconcilable

和解できない
Meaning
impossible to make compatible or bring into harmony; unable to resolve differences
Example
The couple separated due to irreconcilable differences.
そのカップルは和解できない違いのために別れました。
C2 adjective /ɪnˈvɛtərət/

inveterate

常習的な
Meaning
having a long-established habit, activity, or interest that is unlikely to change
Example
He is an inveterate reader who spends hours in the library every day.
彼は毎日数時間を図書館で過ごす常習的な読者です。
B2 verb ɪnˈvɛst.ɪŋ

investing

投資
Meaning
The act of putting money into financial schemes, shares, property, or a commercial venture with the expectation of achieving a profit.
Example
Investing in stocks can generate long-term wealth.
株式投資は長期的な富を生むことができます。
C2 noun /ɪnˈvɛktɪv/

invective

侮辱的な言葉
Meaning
Insulting, abusive, or highly critical language.
Example
The politician’s speech was filled with invective against his opponents.
その政治家の演説は、対立候補に対する侮辱的な言葉で満ちていた。
C2 verb ɪmˈbaɪb

imbibe

吸収する, 同化する, 飲む
Meaning
Absorb or assimilate ideas or knowledge. To drink or take in.
Example
He tried to imbibe the wisdom from his mentor.
彼は師匠から知恵を吸収しようとした。
B2 noun ˈɪn.frəˌstrʌk.tʃər

infrastructure

インフラストラクチャー
Meaning
The basic physical and organizational structures and facilities needed for the operation of a society or enterprise.
Example
Digital infrastructure is vital for future advancements.
デジタルインフラストラクチャーは将来の進歩にとって不可欠です。
C2 noun /ˌɪdiəˈsɪŋkrəsi/

idiosyncrasy

特異性
Meaning
A distinctive or peculiar characteristic, habit, or mannerism unique to an individual.
Example
One of her idiosyncrasies was humming while working.
彼女の一つの特異性は、仕事中に口ずさむことでした。
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。
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。
B2 verb /ɪnˈfɛkt/

infect

感染させる
Meaning
To contaminate with a disease-causing organism.
Example
The virus can infect healthy people quickly.
ウイルスは健康な人々を迅速に感染させることができます。
C1 adjective /ɪnˈsɪdiəs/

insidious

陰険な
Meaning
Proceeding in a gradual, subtle way but with harmful effects.
Example
The insidious spread of misinformation can damage trust.
誤った情報の陰険な広がりは信頼を傷つける可能性がある。
B1 noun /ɪnˈstrʌkʃənz/

instructions

指示
Meaning
Detailed information on how something should be done or operated.
Example
Please follow the instructions on the box.
箱に書かれた指示に従ってください。
B1 verb /ˈɪndɪkeɪt/

indicate

示す
Meaning
to point out; to show or suggest; to be a sign of
Example
The red light indicates that you should stop.
赤い信号は停止すべきことを示しています。
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。
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。
C2 verb /ɪnˈsteɪt/

instate

任命する
Meaning
To set up in position, office, or authority.
Example
The board decided to instate her as the new director.
取締役会は彼女を新しいディレクターにインステイトすることを決定しました。
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/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。
C1 noun /ˌɪnkɑːrˈneɪʃən/

incarnation

化身
Meaning
the embodiment of a deity, spirit, or quality in a physical form
Example
The monk was considered the incarnation of compassion.
その僧侶は慈悲の化身と見なされていた。
C1 adjective /ˌɪnkɒmprɪˈhɛnsəbl/

incomprehensible

理解不能
Meaning
Impossible or very difficult to understand.
Example
The professor’s lecture was so fast it became incomprehensible.
教授の講義は速すぎて理解不能になった。
C2 adjective /ɪmˈpræktɪkəbl/

impracticable

実行不可能
Meaning
Not capable of being carried out or put into practice.
Example
The plan seemed impracticable due to limited resources.
資源が限られていたため、計画は実行不可能に見えました。
C2 adjective /ˌɪntəˈrɒɡətəri/

interrogatory

尋問的な
Meaning
expressed in the form of a question; relating to questioning
Example
The lawyer’s interrogatory tone made the witness uncomfortable.
弁護士の尋問的な口調は証人を不快にさせました。
C1 noun /ɪnˈækjʊrəsi/

inaccuracy

不正確さ
Meaning
lack of accuracy or precision; an incorrect or wrong detail
Example
The report contained several factual inaccuracies.
その報告書にはいくつかの不正確さがあった。
C1 noun /ɪnˈsɜːʃən/

insertion

挿入
Meaning
the action of inserting something into something else
Example
The insertion of the new data was completed successfully.
新しいデータの挿入は成功裏に完了しました。
B2 adjective /ɪnˈsɛnsətɪv/

insensitive

無神経な
Meaning
Showing or feeling no concern for others' feelings.
Example
His insensitive comment hurt her deeply.
彼の無神経なコメントは彼女を深く傷つけました。
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。
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 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。
C1 noun ˌɪntədɪˈpɛndənsi

interdependency

相互依存
Meaning
The dependence of two or more people or things on each other.
Example
The interdependency of the countries led to greater cooperation.
国々の相互依存は、より大きな協力を生み出しました。
C1 noun /ˈɪd.i.əm/

idiom

イディオム
Meaning
A group of words whose meaning is different from the meanings of the individual words.
Example
The idiom 'break the ice' means to start a conversation in a friendly way.
イディオム '氷を破る' は、友好的な方法で会話を始めることを意味します。
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 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 ˌɪdiəsɪnˈkrætɪk

idiosyncratic

奇妙で個人的な
Meaning
Relating to idiosyncrasy; peculiar or individual.
Example
His idiosyncratic behavior set him apart from his colleagues.
彼の独特な行動は彼を同僚たちから区別させた。
B2 verb /ɪnˈflɪkt/

inflict

加える
Meaning
to cause something unpleasant or painful to be suffered by someone or something
Example
The storm inflicted considerable damage to the city.
嵐は都市にかなりの被害を与えました。
C2 noun /ˈɪrɪɡənt/

irrigant

灌漑液
Meaning
A liquid used for irrigation, especially in medical or agricultural contexts.
Example
The doctor used a sterile irrigant during the procedure.
医師は手術中に無菌の灌漑液を使用しました。
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。
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 ˌɪn.krəˈmen.təl

incremental

増分的
Meaning
Relating to or denoting an increase or addition, especially one of a series on a fixed scale; proceeding in small stages.
Example
Incremental changes ensure sustainability.
増分的な変化は持続可能性を確保します。
C2 adjective /ˌɪrɪˈtriːvəbl/

irretrievable

回復不可能
Meaning
impossible to recover or regain
Example
The documents were lost in an irretrievable way after the fire.
火事の後、文書は回復不可能な方法で失われました。
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 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 /ˌɪnkəʊˈhɪərənt/

incoherent

一貫性のない
Meaning
Not clear or easy to understand; lacking logical connection.
Example
His explanation was so incoherent that nobody could follow it.
彼の説明はあまりにも一貫性がなく、誰もそれを追うことができませんでした。
B2 adjective ɪnˈev.ɪ.tə.bəl

inevitable

避けられない
Meaning
Certain to happen; unavoidable.
Example
Death is an inevitable part of life.
死は人生の避けられない一部です。
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。
A2 adjective /ɪnˈtɛlɪdʒənt/

intelligent

賢い
Meaning
Having or showing high mental capacity, quick to learn and understand.
Example
She is one of the most intelligent students in the class.
彼女はクラスで最もインテリジェントな学生の一人です。
C2 noun /ˌɪn.təˈvɛn.ʃə.nɪ.zəm/

interventionism

介入主義
Meaning
Government policy of active involvement in economic affairs.
Example
The central bank's interventionism helped stabilize inflation.
中央銀行の介入主義はインフレの安定に役立った。
B2 verb /ɪnˈheɪl/

inhale

吸う
Meaning
to breathe in; to draw air into the lungs
Example
Take a deep breath and inhale slowly.
深く息を吸い、ゆっくり吸い込みます。
B2 verb /ɪnˈveɪd/

invade

侵入する
Meaning
to enter a place or country forcefully, especially as an enemy
Example
The army invaded the neighboring country.
軍隊は隣国に侵入しました。
C2 verb /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。
A2 noun /ˈɪnfoʊ/

info

情報
Meaning
information; knowledge or facts about something or someone
Example
She gave me all the info I needed for the meeting.
彼女は会議に必要なすべての情報を私にくれました。
B2 noun /ˌɪn.dɪˈkeɪ.ʃən/

Indication

指示; 合図
Meaning
a sign or piece of information that indicates something; a suggestion or hint
Example
The dark clouds were a clear indication that a storm was approaching the area.
暗い雲は嵐がその地域に近づいていることを示す明確な指示でした。
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。
C2 adjective /ˌɪrɪˈdɛsənt/

iridescent

虹色の
Meaning
showing luminous colors that seem to change when seen from different angles
Example
She wore an iridescent dress that sparkled in the light.
彼女は光の中で輝く虹色のドレスを着ていました。
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 /ɪnˈdʒɛnjuəs/

ingenuous

無邪気
Meaning
Innocent, naive, and unsuspecting; showing childlike simplicity and sincerity.
Example
Her ingenuous smile revealed her genuine kindness.
彼女の無邪気な笑顔は彼女の本当の優しさを明らかにしました。
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 adjective /ɪˈnɔːrdənət/

inordinate

過度の
Meaning
Excessive or unusually large in degree.
Example
She spent an inordinate amount of time on her phone.
彼女は電話に過度の時間を費やしました。
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。
B1 noun ˈɪmpækt

impact

影響
Meaning
A strong effect or influence; the action of one object coming forcibly into contact with another.
Example
The decision had great impact.
その決定は大きな影響を与えた。
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。
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。
B1 verb ɪnˈspaɪər

inspire

インスパイアする
Meaning
To fill someone with the urge or ability to do or feel something, especially creative or noble.
Example
Artemis seeks to inspire future generations.
アルテミスは未来の世代にインスパイアを与えようとしています。
C2 noun /ˌɪnvəˈkeɪʃən/

invocation

祈願
Meaning
the act of calling upon a higher power for help, blessing, or inspiration
Example
The ceremony began with an invocation to the gods.
儀式は神々への祈願から始まりました。
C2 noun /ɪmˌpɜːrtərbəˈbɪləti/

imperturbability

不動心
Meaning
The quality of being calm and not easily disturbed or upset.
Example
Her imperturbability during the crisis impressed everyone.
危機の際に彼女の不動心は皆に印象を与えました。
C2 verb /ɪnˈdɛmnɪfaɪ/

indemnify

Meaning
to compensate someone for harm or loss; to secure against future damage or cost
Example
The insurance company agreed to indemnify the client for the damages.