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。

C2 adjective /ɪmˈperɪʃəbəl/

Imperishable

不滅の; 永遠の; 朽ちない

Meaning

not subject to decay; lasting forever; eternal

Example

The imperishable beauty of classical art continues to inspire generations.

古典芸術の不滅の美しさは、世代を超えてインスピレーションを与え続けています。

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 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。

A2 noun /ˈɪndʒəri/

injury

怪我

Meaning

Harm or damage to a person’s body caused by an accident or attack.

Example

He suffered a serious injury during the football match.

彼はサッカーの試合中に重傷を負った。

B2 adjective /ɪˈmædʒ.ɪ.nər.i/

Imaginary

想像上の; 虚構の; 現実でない

Meaning

existing only in imagination; not real; fictional

Example

The child had an imaginary friend who she talked to every day.

その子は毎日話す想像上の友達がいました。

B2 noun /ˈɪntərvəl/

interval

インターバル

Meaning

a period of time between two events or points; a pause or break in activity

Example

There was a short interval between the two performances.

二つの公演の間には短いインターバルがありました。

A1 adjective /ˈɪntrəstɪŋ/ or /ˈɪntəˌrɛstɪŋ/

interesting

面白い

Meaning

Arousing curiosity or attention; holding one’s interest.

Example

The documentary about space was very interesting.

宇宙についてのドキュメンタリーはとても面白かった。

B2 verb /ɪnˈkwaɪər/

inquire

尋ねる

Meaning

to ask; to investigate

Example

She inquired about the job opening.

彼女は仕事の募集について尋ねました。

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。

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 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。

B2 noun /ɪnˈtɒlərəns/

intolerance

不寛容

Meaning

unwillingness to accept or endure beliefs, behaviors, or conditions different from one's own

Example

The leader was criticized for his intolerance toward other religions.

リーダーは他の宗教に対する不寛容さで批判されました。

B2 noun /ˈɪnstɪŋkt/

instinct

本能

Meaning

A natural way of behaving or reacting that does not require learning.

Example

Birds build nests by instinct.

鳥は本能で巣を作ります。

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。

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。

C2 noun /ɪnˈtɜːrstɪs/

interstice

隙間

Meaning

a small space that lies between things

Example

Light filtered through the narrow interstices of the wall.

光は壁の狭い隙間を通して漏れた。

B1 verb ɪnˈkriːsɪŋ

increasing

増加

Meaning

Becoming or making greater in size, amount, intensity, or degree; growing.

Example

Increasing awareness about education is necessary.

教育に対する認識を高めることが必要です。

C2 noun /ˌɪnsəˈrɛkʃən/

insurrection

反乱

Meaning

A violent uprising against an authority or government.

Example

The army was called in to suppress the insurrection.

軍隊は反乱を鎮圧するために呼ばれました。

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 /ˌɪrɪˈdjuːsəbl/

irreducible

不可約

Meaning

impossible to reduce or simplify further

Example

The fraction 3/7 is irreducible.

分数 3/7 は不可約です。

C1 adjective /ˈɪmpətənt/

impotent

無力

Meaning

Lacking power, ability, or strength to take effective action.

Example

The citizens felt impotent against the corrupt system.

市民は腐敗したシステムに対して無力だと感じた。

C1 adjective /ɪnˈtɛlɪdʒəbl/

intelligible

Meaning

Able to be understood; clear enough to be comprehended.

Example

Her speech was barely intelligible over the noise.

C2 adjective /ˌɪntərˈniːsaɪn/

internecine

内部紛争

Meaning

Relating to conflict within a group, often causing mutual destruction.

Example

The internecine conflict weakened the organization from within.

内部紛争は組織を内部から弱体化させた

B2 noun /ˈɪnˌteɪk/

intake

摂取

Meaning

the process of taking something in, especially food or drink

Example

He monitored his daily intake of calories to maintain a healthy diet.

彼は健康的な食事を維持するために毎日のカロリー摂取量を監視しました。

C2 adjective /ɪˈnɪm.ɪ.tə.bəl/

inimitable

比類のない

Meaning

So good or unusual as to be impossible to copy; unique.

Example

His inimitable writing style made him a literary legend.

彼の比類のない筆致が彼を文学の伝説にした。

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。

C2 verb /ˈɪməleɪt/

immolate

犠牲にする/焼死させる

Meaning

To kill or sacrifice, especially by burning.

Example

The protesters threatened to immolate themselves in front of the building.

抗議者たちは建物の前で自ら火にくべると脅した。

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。

C1 noun /ɪmˈbæl.əns/

Imbalance

不均衡

Meaning

lack of proportion or relation between corresponding things; unequal distribution

Example

The doctor said the patient's dizziness was caused by an inner ear imbalance.

医者は患者のめまいが内耳の不均衡によって引き起こされたと言いました。

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。

A1 pronoun /ɪts/

its

それの

Meaning

Belonging to or associated with a thing previously mentioned.

Example

The company changed its logo last year.

会社は昨年そのロゴを変更しました。

B1 adverb /ˈɪnstəntli/

instantly

すぐに

Meaning

immediately, without any delay

Example

He replied instantly to the message.

彼はすぐにメッセージに返事をした。

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。

C1 adjective /ɪˈmækjələt/

immaculate

完璧

Meaning

perfectly clean, neat, or free from flaws

Example

Her room was immaculate, with everything in its place.

彼女の部屋は完璧で、すべてが所定の位置にありました。

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。

C2 adjective /ˌɪnkɔːrˈpɔːriəl/

incorporeal

無形

Meaning

lacking a physical body; not composed of matter; intangible

Example

Ghosts are often described as incorporeal beings.

ゴーストはしばしば無形の存在として描かれます。

C2 verb /aɪˈtɪnəˌreɪt/

itinerate

旅行する

Meaning

To travel from place to place, usually for the purpose of work or preaching.

Example

The missionary itinerated throughout the region to spread the message.

伝道師は地域を巡り、メッセージを広めました。

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。

B2 adjective /ˌɪnəˈproʊpriət/

inappropriate

不適切

Meaning

not suitable or proper in the circumstances

Example

It was inappropriate to talk loudly in the library.

図書館で大声で話すのは不適切でした。

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。

B2 noun /ˈɪnfənt/

infant

乳児

Meaning

A very young child or baby.

Example

The infant was sleeping peacefully in the cradle.

乳児はゆりかごで静かに眠っていました。

C1 adjective /ɪnˈtrɛpɪd/

intrepid

勇敢な

Meaning

fearless and adventurous, often used humorously

Example

The intrepid traveler explored the jungle alone.

その勇敢な旅行者は一人でジャングルを探検した。

A2 pronoun /ɪtˈsɛlf/

itself

それ自身

Meaning

Used to emphasize the thing just mentioned; by its own power or effort.

Example

The cat cleaned itself after eating.

猫は食べた後、自分で自分をきれいにした。

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。

C2 adjective /ɪnˈsɛndiˌɛri/

incendiary

扇動的な / 挑発的な

Meaning

designed to cause fires or stir up conflict

Example

The politician’s incendiary remarks angered the crowd.

政治家の挑発的な発言が群衆を怒らせた。

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。

B2 adjective /ɪnˈkeɪpəbəl/

incapable

無能力な

Meaning

lacking the ability, skill, or capacity to do something

Example

He is incapable of understanding complex instructions.

彼は複雑な指示を理解できない。

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。

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。

C2 noun /ɪnˈtɛɡ.jʊ.mənt/

integument

外皮

Meaning

A natural outer covering, such as skin, shell, or rind.

Example

The snake sheds its integument as it grows.

ヘビは成長するにつれて外皮を脱ぎます。

C1 noun ˌɪrɪˈvɜːrsəbl ˈdæmɪdʒ

irreversible damage

取り返しのつかない損害

Meaning

Harm or injury that cannot be undone or repaired.

Example

Climate change causes irreversible damage to ecosystems.

気候変動は生態系に取り返しのつかない損害を与えます。

B2 noun /ɪnˈtɛnsəti/

intensity

強度

Meaning

The quality of being extreme, strong, or forceful in degree.

Example

The intensity of the storm frightened the villagers.

嵐の強度は村人たちを驚かせた。

C2 adjective /ɪˈnɪkwɪtəs/

iniquitous

不正義

Meaning

grossly unfair and morally wrong

Example

Slavery was one of the most iniquitous practices in history.

奴隷制は歴史上最も不正義な行為の一つでした。

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.

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。

A1 pronoun /aɪ/

i

私

Meaning

used by a speaker to refer to himself or herself

Example

I am learning English every day.

私は毎日英語を学んでいます。

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 /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。

C2 adjective /ɪnˈdjuːbɪtəbl/

indubitable

疑う余地がない

Meaning

Impossible to doubt; unquestionable.

Example

It is indubitable that hard work leads to success.

努力すれば成功に繋がることは疑う余地がない。

C1 adjective /ˌɪnkənˈsiːvəbl̩/

inconceivable

想像できない

Meaning

Impossible to imagine or believe; beyond comprehension.

Example

It seemed inconceivable that she could finish the marathon after such little training.

彼女があれほどのトレーニングでマラソンを完走できるとは想像できなかった。

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。

B2 verb /ɪnˈherɪt/

inherit

相続する

Meaning

to receive money, property, or characteristics from someone when they die; to acquire from predecessors

Example

She inherited her grandmother's house.

彼女は祖母の家を相続しました。

C2 noun /ɪnˌtɛl.ɪˈdʒɛntsi.ə/

intelligentsia

インテリゲンチャ

Meaning

The group of people engaged in intellectual and cultural pursuits in a society.

Example

The intelligentsia played a key role in shaping public opinion.

インテリゲンチャは、世論形成において重要な役割を果たした。

B2 noun /ˌɪntərˈfɪərəns/

interference

干渉

Meaning

the action of interfering with something

Example

The radio signal was disrupted due to interference from nearby electronics.

近くの電子機器からの干渉で、ラジオ信号が途絶えました。

B1 adjective /ɪmˈpeɪʃənt/

impatient

イライラ

Meaning

Not able to wait calmly; restless and eager for something to happen.

Example

She grew impatient while waiting in the long queue.

彼女は長い列で待っている間にイライラしてきた。

C2 verb /ˌɪntərˈmɪt/

intermit

中断する

Meaning

To suspend or stop for a time; to pause intermittently.

Example

The rain would intermit and then start again.

雨は中断し、再び始まる。

C2 adjective /ɪnˈeɪliənəbl/

inalienable

譲渡不可能

Meaning

Unable to be taken away or transferred; absolute and permanent.

Example

Freedom of speech is an inalienable right.

言論の自由は譲渡不可能な権利です。

C2 noun /ˈaɪ.səˌbɑːr/

isobar

等圧線

Meaning

A line on a weather map connecting points of equal atmospheric pressure.

Example

The meteorologist explained how isobars indicate wind speed and direction.

気象学者は、等圧線が風速と風向きを示す方法を説明しました。

B2 adjective ˌɪnɪˈfɛktɪv

ineffective

効果がない

Meaning

Not producing any significant or desired effect; not achieving the intended result.

Example

Rote learning often proves to be ineffective.

暗記学習はしばしば効果がないことが証明されます。

A1 noun /ˌɪnfərˈmeɪʃən/

information

情報

Meaning

Facts or knowledge provided or learned about something.

Example

The website provides useful information about travel destinations.

このウェブサイトは旅行先に関する有用な情報を提供しています。

A2 noun /ˈaɪtəm/

item

アイテム

Meaning

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

Example

Each item on the list must be checked carefully.

リストの各アイテムは慎重にチェックする必要があります。

C1 adjective /ˈaɪərnˌklæd/

ironclad

鉄壁の

Meaning

impossible to change, break, or dispute; very strong and firm

Example

The company had an ironclad contract with its suppliers.

その会社はサプライヤーと鉄壁の契約を結んでいた。

C1 adjective /ˈɪɡ.ni.əs/

igneous

火成

Meaning

Formed through the cooling and solidification of magma or lava.

Example

Granite is an igneous rock commonly used in construction.

花崗岩は建設に一般的に使用される火成岩です。

A2 noun /ˌɪn.trəˈdʌk.ʃən/

introduction

紹介

Meaning

the action of introducing something or someone; an opening or beginning part

Example

The professor gave a brief introduction before starting the lecture.

教授は講義を始める前に簡単なイントロダクションをしました。

C1 noun /ɪmˌpɒsəˈbɪlɪti/

impossibility

不可能性

Meaning

the state or fact of being impossible; something that cannot be done or achieved

Example

Finishing the project in one day was an impossibility.

一日でそのプロジェクトを終えるのは不可能だった。

C2 adjective /ɪmˈpɪəriəs/

imperious

横柄な

Meaning

Arrogantly domineering or overbearing.

Example

Her imperious tone made it hard for others to argue.

彼女の横柄な口調は他の人々が議論するのを難しくしました。

C1 verb /ˈɪtəreɪt/

iterate

反復する

Meaning

To repeat a process or statement, often to improve or refine.

Example

The software team will iterate the design until it meets user needs.

ソフトウェアチームは、ユーザーのニーズを満たすまでデザインを繰り返します。

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。

C2 noun /ˌɪnkænˈteɪʃən/

incantation

呪文

Meaning

a series of words used as a magic spell or charm

Example

The wizard chanted an incantation to summon the spirits.

魔法使いは霊を呼び出すために呪文を唱えました。

C1 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。

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。

B2 noun /ˌɪnəˈbɪləti/

inability

無能

Meaning

the state of being unable to do something

Example

His inability to make decisions affected his career.

彼の意思決定の無能さは彼のキャリアに影響を与えた。

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 noun /ɪnˈdjuːsmənt/

inducement

誘因

Meaning

something that persuades or encourages someone to do something

Example

The company offered a bonus as an inducement to employees.

会社は従業員にインセンティブとしてボーナスを提供しました。

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 /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。

B1 noun ɪmˈpruːv.mənts

improvements

改善

Meaning

The action of making or becoming better; an instance of something becoming or being made better.

Example

Continuous improvements increase productivity.

継続的な改善は生産性を高めます。

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 noun /ɪmˈpaɪ.ə.ti/

Impiety

不敬

Meaning

lack of piety or reverence, especially for a god; disrespect or irreverence toward religious matters

Example

His impiety shocked the religious community when he mocked their sacred ceremonies.

彼の不敬は、彼が彼らの神聖な儀式を嘲笑したとき、宗教コミュニティを驚かせました。

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 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。

C2 adjective /ˌɪnɪkˈspiːdiənt/

inexpedient

不適切

Meaning

Not advisable, suitable, or practical in the circumstances.

Example

It would be inexpedient to invest without proper research.

適切な調査なしで投資することは不適切です。

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。

B2 verb /ɪnˈsʌlt/

insult

侮辱する

Meaning

to speak or act in a way that hurts someone's feelings or shows disrespect

Example

He felt insulted by her rude comments.

彼は彼女の失礼なコメントで侮辱されたと感じた。

C1 adjective /ˌɪn.səˈbɔːr.dɪ.nət/

insubordinate

命令不服従

Meaning

Defiant of authority; disobedient to orders.

Example

The insubordinate employee refused to follow the manager's instructions.

命令不服従の従業員は、マネージャーの指示に従うことを拒否した。

B2 noun /ɪnˈfek.ʃən/

Infection

感染

Meaning

the process of infecting or the state of being infected; a disease caused by germs

Example

The doctor prescribed antibiotics to treat the bacterial infection in her throat.

医師は彼女の喉の細菌感染を治療するために抗生物質を処方しました。

B1 noun ɪnˈven.ʃən

invention

発明

Meaning

The action of inventing something, typically a process or device.

Example

The invention revolutionized communication.

その発明はコミュニケーションを革命的に変えました。

B1 adverb /ɪnˈkrɛdɪbli/

incredibly

信じられないほど

Meaning

to a great degree; extremely or unbelievably

Example

The view from the top of the mountain was incredibly beautiful.

山頂からの景色は信じられないほど美しかった。

B2 adjective /ɪnˈtriːɡɪŋ/

intriguing

非常に興味深く、異常な; 好奇心を引き起こす

Meaning

very interesting and unusual; arousing curiosity

Example

The movie has an intriguing plot that keeps the audience hooked.

その映画は観客を引き付ける非常に興味深いプロットを持っています。

C2 noun /ˈɪnroʊd/

inroad

進展

Meaning

An advance or significant progress, often at the expense of something else.

Example

The company made significant inroads into the mobile market.

その会社はモバイル市場で重要な進展を遂げました。

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 noun ˌɪn.ɪˈfɪʃ.ən.si

inefficiency

非効率

Meaning

The state or quality of not achieving maximum productivity; failure to make the best use of time or resources.

Example

Government inefficiency leads to slow project completion.

政府の非効率性がプロジェクトの完了を遅らせる。

B1 adjective /ˌɪnɪkˈspɛnsɪv/

Inexpensive

安い; 手頃な; 経済的

Meaning

not costing a lot of money; affordable; budget-friendly

Example

This restaurant offers delicious and inexpensive meals for students.

このレストランは学生のためにおいしくて安い食事を提供しています。

C1 noun /ˌɪmpɔːrˈteɪʃən/

importation

輸入

Meaning

The act of bringing goods or services into a country from abroad

Example

The importation of luxury goods is strictly regulated.

高級品の輸入は厳しく規制されています。

B2 adjective /ˈaɪsi/

Icy

氷のような; 非常に冷たい; 敵対的

Meaning

extremely cold; covered with ice; unfriendly or hostile

Example

The icy wind made everyone shiver.

氷のような風が皆を震えさせた。

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。

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。

A2 noun /ɪmˈpɔːtəns/

importance

重要性

Meaning

The quality or state of being important; consequence or significance.

Example

The importance of time management cannot be overstated.

タイムマネジメントの重要性は過大評価できません。

A2 verb /ɪnˈkri:s/

increase

増加

Meaning

to become or make something larger in amount, number, or degree

Example

The company plans to increase its production this year.

その会社は今年、生産を増加させる予定です。

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 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。

B1 verb /ɪnˈtend/

intend

意図する

Meaning

to plan or have in mind as a purpose; to mean

Example

I intend to finish this project by tomorrow.

私はこのプロジェクトを明日までに終わらせるつもりです。

C1 noun /ɪˈmiːdiəsi/

immediacy

即時性, 緊迫感

Meaning

The quality of bringing one into direct and instant involvement with something, giving rise to a sense of urgency or excitement.

Example

The immediacy of digital communication has reshaped business operations.

デジタルコミュニケーションの即時性は、ビジネスの運営方法を変えました。

C1 adjective /ɪnˈdʒʊəriəs/

injurious

有害な

Meaning

Causing or likely to cause harm or damage.

Example

Smoking is injurious to health.

喫煙は健康に有害です。

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。

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。

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。

B2 noun /ɪnˈkluːʒən/

inclusion

インクルージョン

Meaning

the action or state of including or being included within a group or structure

Example

Diversity and inclusion are key values in modern workplaces.

多様性とインクルージョンは現代の職場における重要な価値観です。

C2 noun /ɪnˈvaɪtər/

invitor

招待者

Meaning

a person who invites someone to an event, meeting, or place

Example

The invitor greeted all the guests warmly at the entrance.

招待者は入口で客を温かく迎えた。

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。