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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。
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 verb /ˌɪnkəˈpæsɪteɪt/

incapacitate

無力化する
Meaning
to deprive someone or something of the ability or strength to function
Example
The severe injury incapacitated the player for the rest of the season.
その重傷はプレーヤーをシーズンの残りの期間無力化させた。
C2 adjective /ˌɪnfəˈlɪsɪtəs/

infelicitous

不適切な
Meaning
not suitable or well chosen; awkward or unfortunate
Example
His infelicitous remark ruined the atmosphere of the meeting.
彼の不適切な発言は会議の雰囲気を台無しにしました。
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 noun /ˌɪnkrʌˈsteɪʃən/

incrustation

硬化層
Meaning
a crust or hard coating formed on the surface of something
Example
The old pipes were blocked due to heavy incrustation of minerals.
古いパイプは鉱物の重い硬化層によって詰まっていました。
C2 noun /ˌɪnkənˈɡruːəti/

incongruity

不一致
Meaning
The state of being inconsistent or out of place.
Example
The incongruity of his cheerful mood during the funeral shocked everyone.
葬式の最中に彼の陽気な気分の不一致は、皆を驚かせました。
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。
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 adjective /ˈɜːrksəm/

irksome

迷惑的
Meaning
annoying or irritating
Example
Waiting in a long line is one of the most irksome tasks.
長い列に並んでいるのは、最も迷惑な作業の一つです。
C2 adjective /ɪnˈkɒnstənt/

inconstant

不安定な
Meaning
frequently changing; not consistent or dependable
Example
His inconstant moods made it difficult to work with him.
彼の不安定な気分は彼と仕事をするのを難しくした。
C1 adjective /aɪˈdɪlɪk/

idyllic

田園詩のように美しい
Meaning
Like an idyll; extremely happy, peaceful, or picturesque.
Example
They enjoyed an idyllic vacation by the sea.
彼らは海辺で田園詩のような休暇を楽しみました。
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 noun /ɪmˈbroʊlioʊ/

imbroglio

困惑
Meaning
An extremely confused, complicated, or embarrassing situation.
Example
The political imbroglio lasted for months without resolution.
政治的な困惑は数ヶ月間解決なしで続きました。
B2 adjective /ɪˈmɒrəl/

immoral

不道徳な
Meaning
Not conforming to accepted standards of morality; unethical or wicked.
Example
He was fired for his immoral behavior.
彼は不道徳な行動で解雇されました。
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。
C1 adjective ˈɪn.lənd

Inland

内陸
Meaning
Situated in the interior of a country; away from the coast.
Example
Inland transport boosts local trade.
内陸輸送は地元の貿易を促進します。
C1 adjective, noun /ˈɪnvəlɪd/ (adjective), /ɪnˈvælɪd/ (noun)

invalid

無効
Meaning
Not valid; having no force or effect. Also refers to a person too weak or ill to care for themselves.
Example
The court declared the contract invalid.
裁判所は契約を無効と宣言した。
C2 verb /ɪnˈdɒktrɪˌneɪt/

indoctrinate

教義を押し付ける
Meaning
To teach someone to fully accept a set of beliefs or ideas without question.
Example
The regime tried to indoctrinate the youth with propaganda.
その政権は宣伝を通じて若者を洗脳しようとした。
B2 verb /ˈɪmɪɡreɪt/

immigrate

移住する
Meaning
to come to live permanently in a foreign country
Example
He immigrated to Canada five years ago.
彼は5年前にカナダに移住しました。
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。
C2 adjective /ˈɪnmoʊst/

inmost

最も内面の
Meaning
Situated at the very heart or deepest part; most private or secret.
Example
She revealed her inmost thoughts to her closest friend.
彼女は最も内面的な考えを最も親しい友達に明かした。
B1 adjective /ˈɪnər/

inner

内面的
Meaning
Located inside or closer to the center; relating to one’s thoughts or feelings.
Example
She shared her inner thoughts with her best friend.
彼女は最良の友達に内面的な思いを共有しました。
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。
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
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。
C2 adjective /ɪnˈsɛnseɪt/

insensate

無感情な
Meaning
lacking physical sensation or empathy; without feeling or sensitivity
Example
The dictator's insensate cruelty shocked the world.
独裁者の無感情な残虐さは世界を驚かせた。
C2 adjective /ɪnˈɡreɪʃiˌeɪtɪŋ/

ingratiating

お世辞を言う
Meaning
Charming or flattering in a way intended to gain favor.
Example
His ingratiating smile made everyone trust him quickly.
彼のお世辞を言う笑顔は、すべての人々に彼を素早く信頼させた。
A2 adverb /ˌɪnˈdɔːrz/

indoors

屋内で
Meaning
inside a building; within an enclosed space
Example
Because of the rain, everyone stayed indoors.
雨のため、みんな屋内で過ごしました。
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。
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。
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 /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。
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。
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。
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 /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 noun /ˌɪnkoʊˈhɪrəns/

incoherence

不整合
Meaning
The quality of being unclear, confused, or lacking logical connection.
Example
His speech was full of incoherence and difficult to follow.
彼のスピーチは不整合で、理解するのが難しかった。
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。
C1 noun ɪnˈdɪdʒɪnəs trəˈdɪʃənz

Indigenous Traditions

先住民の伝統
Meaning
Cultural practices, beliefs, and customs that have been passed down through generations among native peoples.
Example
Indigenous traditions in the Chittagong Hill Tracts are unique.
チッタゴン丘陵地帯の先住民の伝統はユニークです。
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 noun /ˈɪmɪdʒəri/

imagery

イメージ
Meaning
visually descriptive or figurative language, especially in a literary work
Example
The poet's use of imagery brought the scene to life.
詩人のイメージの使用は、シーンに命を吹き込みました。
C2 noun /ɪˈnænɪti/

inanity

馬鹿げたこと, 空虚
Meaning
a nonsensical remark or action; silliness; emptiness
Example
The speech was full of inanities that bored the audience.
スピーチは聴衆を退屈させる馬鹿げたことだらけだった。
C2 adjective /ɪnˈɛstɪməbl/

inestimable

計り知れない
Meaning
Too great or valuable to be measured or estimated.
Example
Her contribution to the project was of inestimable value.
プロジェクトへの彼女の貢献は計り知れない価値があった。
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。
C1 verb /ˈɪnsjuleɪt/

insulate

Meaning
To protect something by covering it, especially to prevent heat, sound, or electricity from escaping or entering.
Example
The house was insulated to reduce heating costs.
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。
B2 adjective /ɪmˈplɪsɪt/

implicit

暗黙の
Meaning
Suggested or understood without being directly stated.
Example
Her trust in him was implicit.
彼女の彼に対する信頼は暗黙のものでした。
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 adjective /ˈɪnsələnt/

insolent

無礼な、傲慢な
Meaning
showing a rude and arrogant lack of respect
Example
The insolent student refused to follow the teacher's instructions.
その無礼な学生は教師の指示に従うことを拒否した。
C2 noun /ˌɪmprəˈsɑːrioʊ/

impresario

プロデューサー
Meaning
A person who organizes or finances concerts, plays, or operas.
Example
The impresario arranged a series of concerts for the rising star.
インプレサリオは、急成長するスターのためにコンサートのシリーズを手配しました。
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。
C2 noun /ˈaɪdɪl/

idyll

田園詩的なシーン
Meaning
An extremely happy, peaceful, or picturesque episode or scene, often idealized.
Example
Their honeymoon was an idyll on a tropical island.
彼らのハネムーンは熱帯の島での田園詩的なシーンでした。
C2 noun /ˌɪntərˈrɛɡnəm/

interregnum

政権空白期
Meaning
A period between rulers or governments when normal leadership is suspended.
Example
The country faced instability during the interregnum after the king’s death.
国王の死後、国は政権空白期に不安定さに直面した。
B2 verb aɪˈdɛntɪfaɪd

identified

特定された
Meaning
To recognize or establish who or what someone or something is.
Example
The root causes of the issue need to be identified.
問題の根本的な原因は特定される必要があります。
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。
C1 noun /ˌɪndɪɡˈneɪʃən/

indignation

憤慨
Meaning
Strong displeasure or anger caused by something unjust, offensive, or insulting.
Example
Public indignation grew after the unfair verdict.
不公平な判決の後で、公衆の憤慨が高まった。
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。
B2 noun /ˈaɪkɒn/

icon

アイコン, 象徴
Meaning
A person or thing regarded as a symbol of something, or a graphic symbol on a screen.
Example
The singer became a cultural icon.
その歌手は文化的なアイコンとなった。
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 /ˌaɪ.di.əˈlɒdʒ.ɪ.kəl/

ideological

イデオロギー的
Meaning
Relating to or based on a system of ideas or beliefs.
Example
The two parties are divided by deep ideological differences.
二つの党は深いイデオロギー的な違いによって分裂している。
C2 noun /ˈɪŋkjʊbəs/

incubus

悪夢のような重荷
Meaning
An oppressive or nightmarish burden; in folklore, an evil spirit that lies upon sleeping people.
Example
Debt became an incubus that weighed heavily on the family.
借金は家族に重くのしかかる悪夢のような存在となった。
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。
C1 noun ɪˌræʃ.ənˈæl.ɪ.ti

irrationality

非合理性, 非論理性, 不合理
Meaning
The quality of being illogical or unreasonable; lack of rational thought.
Example
His decision was driven by complete irrationality.
彼の決定は完全に非合理的でした。
A2 noun /ˈɪlnəs/

illness

病気
Meaning
A condition of being unwell or suffering from a disease.
Example
She missed school due to a serious illness.
彼女は深刻な病気のため学校を休んだ。
B2 adjective /ˌɪn.trəˈdʌk.tər.i/

introductory

導入の
Meaning
Serving as an introduction; preliminary or preparatory.
Example
The professor gave an introductory lecture on economics.
教授は経済学についての導入の講義を行いました。
C2 adjective /ɪˈrɛzəluːt/

irresolute

優柔不断
Meaning
uncertain or indecisive; lacking determination
Example
He stood irresolute at the crossroads, unsure which path to take.
彼は交差点で優柔不断に立ち、どの道を取るべきか決められなかった。
B2 noun ˌɪmplɪmenˈteɪʃən

implementation

実行
Meaning
The process of putting a decision or plan into effect; execution.
Example
Proper implementation of policies is crucial.
方針の適切な実行は重要です。
C2 adjective /ˈɪmənənt/

immanent

内在的
Meaning
existing or operating within; inherent
Example
He believed that moral values are immanent in human nature.
彼は道徳的価値が人間の本性に内在していると信じていました。
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。
B1 noun ɪˈnɪʃətɪvz

initiatives

イニシアティブ
Meaning
Actions or strategies designed to resolve a difficulty or improve a situation; programs or projects.
Example
Community initiatives benefit underprivileged groups.
コミュニティのイニシアティブは恵まれないグループに利益をもたらす。
C2 adjective /ˌɪrɛvəˈrɛnʃəl/

irreverential

無礼な
Meaning
Showing a lack of respect for things that are generally taken seriously.
Example
His irreverential humor often shocked traditional audiences.
彼の無礼なユーモアはしばしば伝統的な観客を驚かせました。
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。
C1 adjective /ɪˈnuːmərəbəl/

Innumerable

無数; 数えきれない; 無限
Meaning
too many to be counted; countless; infinite in number
Example
There are innumerable stars in the night sky that we cannot see with our naked eyes.
夜空には数えきれない星があり、私たちは裸眼では見ることができません。
C1 noun /ɪmˈpjʊərəti/

impurity

不純物
Meaning
the state of being unclean or contaminated; a substance that makes something impure
Example
The scientist removed every impurity from the water sample.
科学者は水のサンプルからすべての不純物を取り除いた。
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 adjective /ˈɪn.tɪ.mət/

Intimate

親密な; 個人的な; 詳細な知識
Meaning
close in friendship; private and personal; detailed knowledge
Example
They have an intimate friendship that has lasted for decades.
彼らは何十年にもわたる親密な友情を持っています。
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。
C2 adjective /ɪnˈkoʊətɪv/

inchoative

初期の
Meaning
relating to the beginning of something; in an initial stage
Example
The poet used inchoative expressions to depict the dawn of creation.
詩人は創造の夜明けを描くために初期の表現を使いました。
B1 adverb /ɪˈnɪʃəli/

initially

最初に
Meaning
At the beginning; at first.
Example
Initially, he refused the offer but later accepted it.
最初に、彼はその提案を断ったが、後で受け入れた。
C1 adjective /ɪnˈsteɪbəl/

instable

不安定な
Meaning
not stable; liable to change, collapse, or fail; lacking firmness or reliability
Example
The instable political situation worried foreign investors.
不安定な政治状況が外国の投資家を心配させた。
B2 adverb /ɪnˈɛvɪtəbli/

inevitably

避けられない
Meaning
in a way that cannot be avoided or prevented
Example
Inevitably, the team faced challenges during the project.
避けられないことに、チームはプロジェクト中に挑戦に直面しました。
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。
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。
C1 verb /ɪnˈsaɪt/

incite

扇動する
Meaning
to provoke; to stir up
Example
His speech incited the crowd to violence.
彼のスピーチは群衆を暴力に駆り立てた。
C1 adjective /ˌɪnkənˈkluːsɪv/

inconclusive

結論が出ていない
Meaning
Not leading to a definite result or decision.
Example
The investigation remained inconclusive due to a lack of evidence.
証拠の不足により、調査は結論が出ていないままでした。
C1 verb /aɪˈdiː.ə.laɪz/

idealize

理想化する
Meaning
To regard or represent something as perfect or better than it really is.
Example
Children often idealize their parents.
子供たちはしばしば親を理想化します。
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.
C1 verb /ɪnˈhɪbɪt/

inhibit

抑制する
Meaning
to prevent or restrain someone or something from acting freely; to hinder
Example
Fear can inhibit personal growth.
恐怖は個人の成長を抑制する可能性があります。
C1 verb /ɪnˈvoʊk/

invoke

呼び出す
Meaning
to call upon a higher power, authority, or principle for help, support, or justification
Example
The lawyer invoked the constitution to defend his client.
弁護士は憲法を引き合いに出して自分のクライアントを守った。
A2 adjective /ɪl/

Ill

病気; 不調; 健康状態が悪い
Meaning
sick; unwell; in poor health
Example
He felt ill and decided to stay home from work.
彼は気分が悪く、仕事を休んで家にいることに決めました。
B2 adjective /ɪˈmætʃʊr/

Immature

未熟; 完全に発達していない; 子供っぽい
Meaning
not fully developed; lacking emotional or intellectual development; childish
Example
His immature behavior during the meeting disappointed everyone.
会議中の彼の未熟な行動は、皆を失望させました。
C2 noun /ˌɪnkəˈpæsəti/

incapacity

無能力
Meaning
the lack of ability, power, or fitness to do something
Example
His mental incapacity prevented him from making important decisions.
彼の精神的無能力は、重要な決定を下すのを妨げました。
C2 adjective /ɪnˈvʌlnərəbl/

invulnerable

無敵
Meaning
Impossible to harm, damage, or defeat.
Example
The fortress was thought to be invulnerable to attack.
その要塞は攻撃に対して無敵だと考えられていた。
C1 adjective /ɪˈneɪn/

inane

無意味な, 馬鹿な
Meaning
lacking sense, meaning, or significance; silly or pointless
Example
The movie was criticized for its inane dialogue.
その映画は無意味なセリフで批判された。
C1 adjective /ɪnˈvɪnsəbl/

invincible

無敵
Meaning
too powerful to be defeated or overcome
Example
The team seemed invincible after winning ten matches in a row.
そのチームは10試合連続で勝利した後、無敵に見えた。
C2 verb /ˌɪntərˈsiːd/

intercede

Meaning
to act or plead on behalf of someone in difficulty or trouble; to intervene between parties to help resolve a dispute
Example
She interceded with the teacher to give her brother another chance.
C2 adjective /ˌɪndaɪˈdʒestəbəl/

Indigestible

消化不良な; 消化しにくい
Meaning
difficult or impossible to digest; hard to process in the stomach
Example
The old bread became hard and indigestible.
古いパンは硬くなり、消化不良になった。
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。
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 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 /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 adjective /ɪnˈtɒlərənt/

intolerant

不寛容
Meaning
unwilling to accept or respect beliefs or behavior different from one's own
Example
He is intolerant of any opinion that differs from his own.
彼は自分の意見と異なる意見を全く容認しません。
C1 adjective /ɪˈrɛpərəbəl/

Irreparable

修復不可能
Meaning
impossible to repair or fix; permanent damage that cannot be undone
Example
The accident caused irreparable damage to his spine.
その事故は彼の背骨に修復不可能な損傷を与えました。
C1 noun /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。
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 adjective /ɪnˈfleɪtɪd/

inflated

膨らんだ
Meaning
excessively increased in size, value, or importance; filled with air or gas
Example
The company faced criticism for its inflated prices.
その会社は膨らんだ価格で批判を受けました。
B2 noun ɪnˈsɛntɪvz

incentives

インセンティブ
Meaning
Things that motivate or encourage one to do something.
Example
Tax incentives are used to encourage investment in renewable energy.
税制上のインセンティブは再生可能エネルギーへの投資を促進するために使用されます。
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。
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。
C2 adjective /ɪnˈsɪpiənt/

incipient

初期の
Meaning
in an initial stage; beginning to develop
Example
The incipient storm made the sky turn dark and heavy.
初期の嵐が空を暗く重くさせた。
C1 verb /ɪnˈdʌkt/

induct

Meaning
to formally admit someone into a position, organization, or office
Example
She was inducted into the university's honor society.
C1 noun /ˈɪntərˌluːd/

interlude

間奏
Meaning
A short period of time that comes between two events; an interval.
Example
There was a brief musical interlude between the two acts of the play.
演劇の二つの幕の間に短い音楽の間奏がありました。
B2 verb /ɪnˈdʒɛkt/

inject

注射する
Meaning
To introduce a substance, especially a drug, into the body using a needle.
Example
The nurse will inject the vaccine into the patient's arm.
看護師は患者の腕にワクチンを注射します。
C1 adjective /ˌɪndɪˈstɪŋkt/

indistinct

不明瞭な
Meaning
Not clear or sharply defined; vague or blurred.
Example
The sound of voices was indistinct in the distance.
遠くからの声は不明瞭でした。
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。
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 noun /ɪnˈtruː.ʒən/

intrusion

不正侵入
Meaning
Unauthorized entry into a system or place without permission
Example
The company detected an intrusion in its server.
会社はサーバーに侵入を検出しました。
B2 noun /ɪnˈspekʃən/

inspection

検査
Meaning
a careful examination of something, especially to check that it is correct or safe
Example
The building passed the safety inspection last week.
その建物は先週、安全検査に合格しました。
B2 adjective /ɪmˈprɒp.ər/

Improper

不適切な; 不正確な; 不適当な
Meaning
inappropriate; incorrect; not suitable
Example
It would be improper to discuss personal matters in a business meeting.
ビジネス会議で個人的な事柄を議論するのは不適切です。
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。