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。

C1 verb /ɪˈmɔːrtəlaɪz/

immortalize

不朽の

Meaning

to preserve the memory of someone or something forever

Example

The statue was built to immortalize the hero’s sacrifice.

その像は、英雄の犠牲を永遠にするために建てられました。

C1 noun /ˈɪnlɛt/

inlet

入り江

Meaning

A small arm of the sea, a lake, or a river; an opening or passage for entry.

Example

The boat entered a narrow inlet along the coast.

船は海岸沿いの狭い入り江に入った。

C1 adjective /ɪnˈɛlɪdʒəbəl/

Ineligible

不適格; 無資格; 選ばれない

Meaning

not qualified or entitled to participate or be chosen; unsuitable

Example

Students with poor grades are ineligible for the scholarship program.

成績が悪い学生は奨学金プログラムに応募できません。

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 noun /ɪmˈprɪzənmənt/

imprisonment

投獄

Meaning

the act of putting someone in prison; the state of being confined as punishment

Example

He faced imprisonment for violating the court order.

彼は裁判所の命令に違反して投獄に直面した。

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。

C1 adjective /ɪnˈkɒŋɡruəs/

incongruous

不調和

Meaning

Not fitting in with or suitable for the surroundings.

Example

His jokes were incongruous during the serious meeting.

彼の冗談は真面目な会議では不調和だった。

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 adjective /ˈɪndɪɡoʊ bluː/

Indigo-blue

インディゴブルー

Meaning

a deep blue color with a purplish tinge

Example

The indigo-blue sky looked magnificent at twilight.

インディゴブルーの空は夕暮れ時に壮大に見えた。

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 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。

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。

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。

C1 verb /ɪnˈklaɪn/

incline

傾く

Meaning

to feel willing or favorably disposed toward something; to bend or tilt

Example

She is inclined to agree with the proposal.

彼女は提案に賛成する傾向があります。

C1 verb /ˈɪmplɪˌkeɪt/

implicate

関与する

Meaning

To show someone’s involvement in a crime or wrongdoing.

Example

The evidence implicated several officials in the scandal.

証拠はスキャンダルに関与した何人かの職員を示した。

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 adjective /ɪnˈflɛksəbl/

inflexible

柔軟性がない

Meaning

Not able to bend or change; unwilling to change ideas or behavior.

Example

His inflexible attitude made negotiations difficult.

彼の柔軟性がない態度は交渉を難しくしました。

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。

C1 noun /aɪˈtɪnərɛri/

itinerary

旅程

Meaning

A planned route or schedule of a journey or trip.

Example

The travel agent gave us a detailed itinerary for our vacation.

旅行代理店は私たちの休暇のために詳細な旅程を提供してくれました。

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。

C1 noun /ɪmˈpɛd.ɪ.mənt/

impediment

障害

Meaning

A hindrance or obstruction in doing something; something that prevents progress.

Example

Lack of funds is a major impediment to the project.

資金不足はプロジェクトの大きな障害です。

C1 adjective /ˌaɪdiəˈlɪstɪk/

Idealistic

理想主義的

Meaning

pursuing high principles or ideals; unrealistically optimistic

Example

She has an idealistic view of changing the world.

彼女は世界を変えるという理想主義的な見方を持っています。

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。

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。

C1 adjective /ɪnˈhjuːmən/

Inhuman

非人道的

Meaning

lacking human qualities of compassion and mercy; cruel or barbaric

Example

The prisoners were kept in inhuman conditions.

囚人たちは非人道的な状況で収容されていました。

C1 noun /ˌɪməˈrælɪti/

immorality

不道徳

Meaning

the quality of being immoral; behavior that violates accepted moral standards

Example

The community condemned the immorality of the corrupt officials.

地域社会は腐敗した役人の不道徳を非難した。

C1 noun /ɪnˈsæn.ə.ti/

Insanity

狂気; 精神疾患

Meaning

the state of being seriously mentally ill; extreme foolishness or irrationality

Example

The defense lawyer argued that his client was not guilty by reason of insanity.

弁護人は、被告人が狂気によって無罪であると主張した。

C1 noun /ˌɪnklɪˈneɪʃən/

inclination

傾向

Meaning

A natural tendency or urge to act or feel in a particular way.

Example

She has an inclination towards helping others.

彼女は他の人を助ける傾向があります。

C1 adjective /aɪˈreɪt/

irate

激怒した

Meaning

Extremely angry.

Example

The customer became irate after waiting for hours.

顧客は何時間も待った後、激怒しました。

C1 noun /ˌɪntɪˈmeɪʃən/

intimation

示唆

Meaning

A subtle or indirect hint or suggestion.

Example

She gave no intimation of her plans.

彼女は自分の計画について何の示唆も与えなかった。

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 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。

C1 noun ˈɪm.pɪ.təs

impetus

推進力

Meaning

The force or motivation that drives something forward; momentum.

Example

The new policy provided an impetus for economic growth.

新しい政策は経済成長のための推進力を提供しました。

C1 noun /ɪmˈpɜːrtɪnəns/

impertinence

無礼

Meaning

lack of respect; rudeness

Example

The teacher was shocked by the student's impertinence.

教師は生徒の無礼さに驚いた。

C1 noun /ɪˈreləvəns/

irrelevance

無関係性

Meaning

the quality of not being connected to or important for a particular matter; lack of significance

Example

His long explanation only highlighted the irrelevance of the details to the main issue.

彼の長い説明は、細部が主な問題と無関係であることを強調しただけだった。

C1 adjective /ˌɪnədˈvɜːrtənt/

inadvertent

意図しない, 不注意な

Meaning

Not resulting from or achieved through deliberate planning; unintentional.

Example

Her inadvertent mistake caused a delay in the project.

彼女の不注意なミスがプロジェクトの遅延を引き起こしました。

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。

C1 noun /ˌɪm.pəˈzɪʃ.ən/

Imposition

課税; 負担; 不公平な要求

Meaning

the action or process of imposing something or of being imposed; an unfair burden or demand

Example

The imposition of new taxes without consultation angered the citizens greatly.

相談なしに新しい税金が課され、市民は非常に怒りました。

C1 noun /ˌɪnflɛksɪˈbɪlɪti/

inflexibility

柔軟性の欠如

Meaning

the quality of being rigid or unwilling to change; lack of adaptability

Example

The inflexibility of the rules caused unnecessary delays.

規則の柔軟性の欠如が不要な遅れを引き起こした。

C1 noun /ˌaɪ.diˈɒl.ə.dʒi/

ideology

イデオロギー

Meaning

A system of ideas and ideals, especially one that forms the basis of economic or political theory and policy.

Example

Democracy is based on the ideology of freedom and equality.

民主主義は自由と平等のイデオロギーに基づいています。

C1 adjective /ɪmˈpæsəbəl/

impassable

通行不可能

Meaning

Impossible to travel along or over.

Example

The road became impassable after the heavy snowfall.

大雪の後、道は通行不可能になりました。

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 adjective /ɪnˈɡreɪnd/

ingrained

根強い

Meaning

Firmly fixed or established; deeply rooted and difficult to change.

Example

His ingrained habits were hard to break.

彼の根強い習慣は壊すのが難しかった。

C1 adjective /ɪˈrɛfjʊtəbəl/

Irrefutable

反論できない

Meaning

impossible to deny or disprove; undeniable

Example

The evidence against him was irrefutable.

彼に対する証拠は否定できないものでした。

C1 adjective /ˌɪntərˈtwaɪnd/

intertwined

幸福

Meaning

closely connected or twisted together

Example

Their lives became deeply intertwined after the accident.

彼女は賞を受け取ったとき、幸せを隠せませんでした。

C1 noun ɪnˈsɛpʃən

inception

始まり

Meaning

The establishment or starting point of an institution or activity.

Example

The inception of the company marked a new era in the industry.

その企業のインセプションは業界に新しい時代を築きました。

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 adjective /ˌɪnədˈvaɪzəbl/

inadvisable

推奨されない

Meaning

Not recommended; likely to have undesirable consequences.

Example

It is inadvisable to drive in such heavy rain.

このような大雨の中で運転するのは推奨されません。

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。

C1 adjective /ˌɪn.dɪˈspen.sə.bəl/

indispensable

不可欠

Meaning

Absolutely necessary, essential

Example

Water is indispensable for human survival.

水は人間の生存に不可欠です。

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。

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 verb /ɪnˈskraɪb/

inscribe

刻む

Meaning

to write or carve words or symbols on a surface

Example

They inscribed her name on the trophy.

彼らはトロフィーに彼女の名前を刻みました。

C1 adjective /ɪˈmuː.və.bəl/

immovable

動かせない

Meaning

Not able to be moved; fixed in position.

Example

Immovable barriers prevent change.

動かせない障害物が変化を妨げる。

C1 adjective /ɪnˈvɛntɪv/

inventive

創造的

Meaning

Having the ability to create or design new things or to think originally.

Example

The inventor was known for his inventive solutions to everyday problems.

発明家は日常の問題に対する創造的な解決策で知られていた。

C1 adjective /ɪnˈstɪŋk.tɪv/

instinctive

本能的, 自然な, 自動的

Meaning

Based on instinct; done without conscious thought; natural and automatic.

Example

His instinctive reaction saved his life.

彼の本能的な反応は彼の命を救った。

C1 adjective ˌɪn.təˈdɪs.ɪ.plɪ.nər.i

interdisciplinary

学際的

Meaning

Relating to more than one branch of knowledge.

Example

The interdisciplinary approach in education enhances problem-solving skills.

教育における学際的アプローチは、問題解決スキルを向上させる。

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 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。

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 adjective ɪnˈkʌm.bənt

incumbent

義務的な

Meaning

necessary for (someone) as a duty or responsibility.

Example

It is incumbent upon all citizens to obey the law.

すべての市民が法律を守るのは義務である。

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。

C1 adjective /ɪmˈpɛn.ɪ.trə.bəl/

impenetrable

Meaning

Impossible to pass through or enter; impossible to understand.

Example

The dense forest was nearly impenetrable.

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。

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 /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 noun /ˈɪnflʌks/

influx

流入

Meaning

A large arrival or flow of people or things.

Example

The city experienced an influx of tourists during the festival.

その都市は祭りの期間中に観光客の流入を経験しました。

C1 noun ɪnˈflɛk.ʃən

inflection

イントネーション

Meaning

The change in pitch or tone of voice when speaking for emphasis.

Example

His inflection kept the audience engaged.

彼のイントネーションは観客を引きつけた。

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。

C1 adjective /ɪnˈkɒmp(ə)rəbl/

incomparable

比類のない

Meaning

Without an equal in quality or excellence; matchless.

Example

The view from the mountain was incomparable.

山からの景色は比類のないものでした。

C1 adjective /ˌɪndɪˈskriːt/

indiscreet

軽率

Meaning

Not careful in what one says or does, likely to reveal secrets or offend.

Example

It was indiscreet of him to mention the plan in public.

公衆の面前で計画について言及するのは軽率だった。

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 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 noun /aɪl/

isle

小さな島

Meaning

A small island or peninsula, often poetic or literary.

Example

They spent their honeymoon on a beautiful tropical isle.

彼らは美しい熱帯の島でハネムーンを過ごしました。

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 adjective /ɪmˈpʌlsɪv/

impulsive

衝動的な, 直感的な

Meaning

acting suddenly without careful thought

Example

She made an impulsive decision to buy the car.

彼女は衝動的な決定で車を買うことにしました。

C1 verb /ɪnˈvælɪdeɪt/

invalidate

無効にする

Meaning

To make something not valid or legally acceptable.

Example

The new evidence may invalidate the previous ruling.

新しい証拠が前の判決を無効にするかもしれません。

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 /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。

C1 adjective /ˌɪnəˈfɛnsɪv/

inoffensive

無害な

Meaning

Not likely to offend or provoke; harmless.

Example

His inoffensive remarks kept the conversation friendly.

彼の無害なコメントは会話を友好的に保ちました。

C1 adjective /ɪnˈfɜːm/

infirm

虚弱

Meaning

Weak, especially due to old age or illness.

Example

The infirm old man needed assistance to walk.

その虚弱な老人は歩くために助けが必要でした。

C1 verb ɪˈnɔː.ɡjə.reɪ.tɪd

inaugurated

開会

Meaning

Begin or introduce (a system, policy, or period) formally.

Example

The organization was inaugurated officially.

その組織は正式に開会されました。

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。

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 noun /ɪnˈtɛstɪn/

intestine

腸

Meaning

The part of the digestive system where food is digested and absorbed, extending from the stomach to the anus.

Example

The doctor explained how nutrients are absorbed in the small intestine.

医者は、小腸で栄養素がどのように吸収されるかを説明しました。

C1 noun ˌɪndɪˈspensəbl̩ ˈkɒmpɪtənsi

indispensable competency

不可欠な能力

Meaning

Essential skill or ability that cannot be done without; a crucial capability that is absolutely necessary.

Example

Digital literacy is an indispensable competency in the 21st century.

デジタルリテラシーは21世紀のインディスペンセブルなコンピテンスです。

C1 adjective /ɪnˈfæləbl̩/

infallible

間違いない

Meaning

incapable of making mistakes or being wrong

Example

Her judgment seemed infallible in matters of finance.

彼女の判断は財務問題において間違いないように見えた。

C1 adjective /ɪmˈplɔːzəbl/

implausible

信じがたい

Meaning

Not seeming reasonable or probable; unlikely to be true.

Example

The story she told was so implausible that no one believed her.

彼女が話した話はあまりにも信じられないほどで、誰も彼女を信じなかった。

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。

C1 noun /ɪnˈdem.nə.ti/

Indemnity

補償

Meaning

security or protection against a loss or other financial burden; compensation for damage or loss

Example

The insurance company provided full indemnity for the damages caused by the flood.

保険会社は洪水による損害に対して完全な補償を提供しました。

C1 noun ˌɪn.tuˈɪʃ.ən

intuition

直感

Meaning

The ability to understand something immediately, without the need for conscious reasoning.

Example

Her intuition told her something was wrong.

彼女の直感は何かが間違っていると言った。

C1 noun /ɪnˈsek.tɪ.saɪd/

Insecticide

殺虫剤

Meaning

a substance used for killing insects; a chemical pesticide that targets insects

Example

The farmer sprayed insecticide on his crops to protect them from harmful bugs.

農夫は作物を有害な虫から守るために殺虫剤を噴霧しました。

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。

C1 verb /ˈɪnfɪltreɪt/

infiltrate

浸透

Meaning

to secretly enter or gain access to a place or group

Example

The spies managed to infiltrate the enemy base.

スパイたちは敵基地に infiltrate できた。

C1 verb ɪˈmɜːrs

immerse

浸る

Meaning

To involve oneself deeply in a particular activity or interest; to surround completely.

Example

Immerse yourself in the new language.

新しい言語に浸ってください。

C1 noun /ˌɪntəkəˈnɛktɪvɪti/

interconnectivity

相互接続性

Meaning

The state of being interconnected or the degree of connectivity between components

Example

The rise of interconnectivity has transformed global communication.

インターコネクティビティの発展は、世界中のコミュニケーションを変革しました。

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 /ɪmˈplɔːr/

implore

Meaning

To beg someone earnestly or desperately to do something.

Example

She implored him to stay with her.

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 adjective /ɪnˈsɛp(ə)rəbəl/

inseparable

切り離せない

Meaning

Unable to be separated or always together.

Example

The two friends have been inseparable since childhood.

二人の友達は子供の頃から切り離せないです。

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 /ɪmˈprɒbəbl/

improbable

あり得ない

Meaning

Not likely to be true or to happen.

Example

It seems improbable that he will arrive on time.

彼が時間通りに到着するのはあり得ないようだ。

C1 verb /ɪˈluːmɪneɪt/

illuminate

照らす

Meaning

To light up or make something clearer.

Example

Streetlights illuminate the road at night.

街路灯が夜に道路を照らします。

C1 noun ˌɪnfrəˈstrʌktʃərəl dɪˈveləpmənt

infrastructural development

インフラ整備

Meaning

The process of building and improving the basic physical and organizational structures and facilities needed for the operation of a society or enterprise.

Example

Infrastructural development is necessary for efficient recycling.

インフラストラクチャー開発は効率的なリサイクルに必要です。

C1 adverb /ɪnˈvɜːrs.li/

Inversely

逆に; 反対に

Meaning

in a way that is opposite or contrary; in reverse order or manner

Example

The price of goods is inversely related to their availability in the market.

商品の価格は市場での入手可能性に逆に関連しています。

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。

C1 adjective /ɪnˈsʌf.ər.ə.bəl/

insufferable

耐え難い

Meaning

Too extreme to bear; intolerable.

Example

The heat during the summer was insufferable.

夏の暑さは耐え難かった。

C1 adjective /ɪˈlɒdʒ.ɪ.kəl/

Illogical

非論理的

Meaning

not reasonable or sensible; lacking logic

Example

It would be illogical to go swimming in such cold weather.

こんなに寒い天気で泳ぐのは非論理的です。

C1 adjective ɪnɪɡˈzɔːstɪbəl

inexhaustible

尽きることのない

Meaning

Unable to be used up or worn out; limitless.

Example

His inexhaustible energy allowed him to work tirelessly on his projects.

彼の尽きることのないエネルギーは、彼がプロジェクトに休むことなく取り組むことを可能にしました。

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。

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。

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。

C1 adjective /ˈɪnsjələr/

insular

狭い心の、島に関連する

Meaning

Narrow-minded, isolated, or relating to an island.

Example

The community was criticized for its insular attitudes toward outsiders.

そのコミュニティは外部の人々に対する狭量な態度で批判されました。

C1 adjective /ˌɪntərˈtʃeɪndʒəbl/

interchangeable

交換可能な

Meaning

able to be exchanged with each other without difference or loss of function

Example

These machine parts are interchangeable, so they can be replaced easily.

これらの機械部品は交換可能なため、簡単に交換できます。

C1 verb /ˈɪrɪˌɡeɪt/

irrigate

灌漑する

Meaning

to supply water to land or crops; to wash out a wound with water

Example

Farmers irrigate their fields during dry seasons.

農家は乾季に畑に灌漑を行います。

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 /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 noun /ɪnˈdʌstriəsnəs/

industriousness

勤勉

Meaning

The quality of being hardworking and diligent.

Example

His industriousness earned him a promotion at work.

彼の勤勉さは、仕事で昇進をもたらしました。

C1 verb /ɪˈnɔːɡjʊreɪt/

inaugurate

Meaning

To formally begin or introduce something, especially with a ceremony.

Example

The mayor will inaugurate the new bridge tomorrow.

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。