C1 adjective /ɪnˈvɑːlənˌtɛri/

involuntary

不随意

Meaning

done without will or conscious control

Example

He gave an involuntary shiver when he heard the loud noise.

彼は大きな音を聞いたとき、不随意に震えた。

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。

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 adjective /ɪmˈpælpəbəl/

impalpable

触れない

Meaning

unable to be felt by touch; difficult to grasp or understand

Example

There was an impalpable sense of fear in the room.

部屋には触れない恐怖感があった。

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。

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 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。

B2 verb /ɪnˈfɜːr/

infer

Meaning

to conclude or deduce something from evidence and reasoning rather than from explicit statements

Example

From his silence, I inferred that he was not happy with the decision.

B2 noun, verb /ˈɪnstɪˌtjuːt/

institute

インスティチュート

Meaning

as a noun, an organization founded for a specific purpose; as a verb, to establish or initiate

Example

The university decided to institute new rules for the library.

大学は図書館のために新しいルールを設立することを決定しました。

C1 adjective; noun /ɪˈmɔːrtl/

immortal

不死の

Meaning

living forever; never dying; lasting forever in fame or memory

Example

Legends often describe heroes as immortal beings who never die.

伝説では英雄は不死の存在だとされる。

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 /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。

C2 noun /ˈɪnsələns/

insolence

無礼

Meaning

rude or disrespectful behavior

Example

The teacher was shocked by the student's insolence.

教師は学生の無礼に驚きました。

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。

B1 verb /ɪmˈprɛs/

impress

感動させる

Meaning

to cause someone to feel admiration or respect

Example

Her speech managed to impress the audience.

彼女のスピーチは聴衆を感動させました。

C1 adjective /ɪˈnænɪmət/

inanimate

無生物

Meaning

not alive, especially not in the manner of animals and humans; lifeless

Example

The museum was full of inanimate objects from ancient times.

博物館には古代の無生物がいっぱいだった。

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。

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 /ɪˈlɪmɪtəbl/

illimitable

無限

Meaning

Without limits or bounds.

Example

The universe is often described as illimitable.

宇宙はしばしば無限であると説明されます。

C2 verb /ɪnˈdaɪt/

indite

作詞する

Meaning

To write or compose (literary or formal works).

Example

The poet indited a heartfelt sonnet.

詩人は心のこもったソネットを作詞した。

C2 adjective ˌɪn.ɪ.fɪˈkeɪ.ʃəs

inefficacious

効果がない

Meaning

Not producing any or the desired effect; ineffective.

Example

The treatment was inefficacious in curing the disease.

その治療法は病気の治癒に効果がありませんでした。

B2 adjective /ɪnˈækjərət/

Inaccurate

不正確; 間違っている; 誤り

Meaning

not correct; containing errors; wrong

Example

The weather forecast was inaccurate yesterday.

昨日の天気予報は不正確でした。

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。

B2 adjective /ɪnˈfɪə.ri.ər/

inferior

劣等

Meaning

Of lower quality, rank, or status.

Example

This material is inferior to the one we used before.

この素材は以前使ったものより劣っています。

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。

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。

A2 adjective/noun /ˈaɪrɪʃ/

irish

幸福

Meaning

relating to Ireland, its people, or its language

Example

The Irish countryside is very beautiful.

彼女は賞を受け取ったとき、幸せを隠すことができませんでした。

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 /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。

C2 adjective /ɪnˈkɑːdʒɪtənt/

incogitant

無思慮な

Meaning

Lacking thought; inconsiderate or thoughtless.

Example

It was incogitant of him to make such a rude comment.

彼がそんな失礼なコメントをするのは無思慮なことでした。

C2 adjective /ˌɪməˈmɔːriəl/

immemorial

不朽の

Meaning

Extending back beyond memory or record; ancient.

Example

The tradition has been followed since time immemorial.

その伝統は不朽の時代から受け継がれてきた。

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。

B2 adjective /ˌɪntərˈmiːdiət/

intermediate

中級

Meaning

Coming between two things in time, place, or order; in the middle level or stage.

Example

She is taking an intermediate-level French course.

彼女は中級のフランス語コースを受講しています。

C1 noun /ˈɪn.trə.vɜːrt/

introvert

内向的

Meaning

A person who tends to be shy and prefers spending time alone rather than in groups.

Example

As an introvert, he preferred reading over attending parties.

内向的な性格として、パーティに参加するよりも読書の方が好きでした。

B1 noun /ˈɪnpʊt/

input

入力、提供された情報

Meaning

information, advice, or data that is put into a system, device, or process

Example

The manager asked for everyone's input on the new project.

マネージャーは新しいプロジェクトに対する全員のインプットを求めました。

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。

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 /ɪnˈsɪɡniə/

insignia

徽章

Meaning

A badge or symbol that shows rank, position, or membership.

Example

The soldier proudly wore the insignia of his regiment.

兵士は誇らしげに自分の連隊の徽章を身に着けていました。

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 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。

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 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 /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 noun /ˌɪnsəˈfɪʃənsi/

insufficiency

不足

Meaning

The state of not being enough or not being adequate.

Example

The project failed due to the insufficiency of funds.

プロジェクトは資金不足のため失敗しました。

C2 noun /ˌɪmpjuˈteɪʃən/

imputation

非難

Meaning

an accusation or attribution of blame

Example

The politician denied the imputation of corruption.

政治家は腐敗の非難を否定した。

C2 adjective /ˌɪnsəˈpɔːrtəbl̩/

insupportable

耐えられない

Meaning

Too extreme or difficult to be endured.

Example

The heat was insupportable during the long journey.

長い旅の間、暑さは耐えられなかった。

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。

A2 noun, verb /ˈɪʃuː/

issue

問題, 発行, 配布

Meaning

A problem, topic, or the act of supplying or distributing something.

Example

The magazine will issue a new edition next week.

雑誌は来週新しい版を発行します。

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 /ˌɪnstənˈteɪniəs/

instantaneous

即時

Meaning

Happening immediately, without any delay.

Example

The change in temperature was almost instantaneous.

温度の変化はほぼ即時でした。

B2 noun /ˌaɪ.səˈleɪ.ʃən/

Isolation

隔離

Meaning

the process or fact of isolating or being isolated; separation from other people or things

Example

The patient was kept in isolation to prevent the spread of the infectious disease.

患者は感染症の拡大を防ぐために隔離されました。

B2 verb /ɪtʃ/

itch

かゆみ

Meaning

to feel an urge to scratch; to have a restless desire

Example

My skin itches from the mosquito bites.

蚊に刺されて肌がかゆいです。

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 /ɪnˈveɪsɪv/

invasive

侵襲的

Meaning

Tending to spread harmfully, intruding aggressively, or encroaching beyond proper boundaries.

Example

The doctor explained that the procedure was minimally invasive.

医者は、その手順が最小限の侵襲的であることを説明しました。

C2 adjective /ˌɪlˈneɪ.tʃəd/

ill-natured

性格が悪い

Meaning

Having a bad or unpleasant character; unkind or malicious.

Example

He made an ill-natured remark about his colleague.

彼は同僚について悪意のある発言をしました。

C2 noun /ˌɪnjuːˈɛndəʊ/

innuendo

暗示

Meaning

An allusive or oblique remark or hint, typically a suggestive or disparaging one.

Example

The manager's innuendo was directed towards his competitor.

マネージャーの暗示は競争相手に向けられていました。

A2 adjective, noun /ɪˈtæliən/

italian

幸福

Meaning

relating to Italy, its people, or its language; a person from Italy

Example

She loves Italian food.

彼女は賞を受け取ったとき、自分の幸せを隠せませんでした。

C2 adjective /ˌɪnkəmˈprɛsəbl/

incompressible

圧縮不可能

Meaning

Not able to be pressed or squeezed into a smaller space.

Example

Liquids are generally considered incompressible.

液体は通常、圧縮不可能と見なされます。

C1 verb /ˈaɪdəlaɪz/

idolize

偶像視する

Meaning

To admire or worship someone excessively.

Example

Fans often idolize celebrities for their talent and lifestyle.

ファンはしばしばその才能とライフスタイルのために有名人を偶像視します。

C1 noun /ɪnˈsɜːrdʒənt/

insurgent

反乱者

Meaning

A person who rises in revolt against authority or government.

Example

The army arrested several insurgents after the attack.

軍隊は攻撃後、数人の反乱者を逮捕した。

C2 adjective /ɪmˌpɜːrˈsweɪdəbl/

impersuadable

説得できない

Meaning

not able to be convinced or persuaded

Example

She remained impersuadable despite all our arguments.

彼女はすべての議論にもかかわらず説得できなかった。

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。

B2 noun /ɪnˈkwaɪəri/ or /ˈɪnkwəri/

inquiry

調査 / 問い合わせ

Meaning

An act of asking for information; an investigation into something.

Example

The committee launched an inquiry into the financial irregularities.

委員会は財務の不正行為に関する調査を開始しました。

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。

B2 adjective /ɪmˈper.ə.tɪv/

imperative

命令形

Meaning

Of vital importance; crucial; giving or expressing a command.

Example

It is imperative to address the climate crisis immediately.

気候危機に直ちに対処することがインペラティブです。

C2 verb ˈɪn.kʌl.keɪt

inculcate

教え込む

Meaning

Instill an attitude, idea, or habit by persistent instruction; to teach and impress by frequent repetitions.

Example

Parents should inculcate good values in their children.

親は子供たちに良い価値観を教え込むべきだ。

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 /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。

C2 adjective /ɪˈnɪmɪkəl/

inimical

敵対的 / 不利な

Meaning

tending to obstruct or harm; unfriendly or hostile

Example

The policy was inimical to the country's economic growth.

その政策は国の経済成長に不利だった。

C2 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。

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。

C1 adjective /ɪnˈsɪstənt/

insistent

執拗な

Meaning

demanding something firmly and refusing to accept no

Example

The child was insistent on getting a new toy.

その子供は新しいおもちゃを手に入れることに執拗だった。

C1 verb /ɪɡˈnaɪt/

ignite

点火する

Meaning

To catch fire or cause to catch fire; to start or arouse.

Example

The sparks ignited the dry leaves in seconds.

火花が数秒で乾燥した葉に火をつけた。

B2 noun /ˌɪnsɪˈkjʊərɪti/

insecurity

不安感

Meaning

lack of confidence or assurance; a state of uncertainty or vulnerability

Example

Her insecurity made her doubt her abilities despite her experience.

彼女の不安感は彼女に自分の能力を疑わせた。

B1 adjective /ˌɪmpəˈlaɪt/

impolite

無礼

Meaning

Not showing good manners; rude.

Example

It is impolite to interrupt someone while they are speaking.

誰かが話しているときに邪魔をするのは失礼です。

B2 noun /ɪnˈhæbɪtənt/

inhabitant

住民

Meaning

a person or animal that lives in a particular place

Example

The inhabitants of the village rely on farming for their livelihood.

村の住民は生活のために農業に頼っています。

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。

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 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 noun ˌɪn.fləˈmeɪ.ʃən

inflammation

炎症

Meaning

A localized physical condition in which part of the body becomes reddened, swollen, hot, and often painful.

Example

Chronic inflammation can lead to severe diseases.

慢性炎症は重篤な疾患を引き起こす可能性があります。

B2 verb /ɪnˈtriːɡ/

intrigue

魅了する

Meaning

to arouse curiosity or interest; to make someone fascinated

Example

The mystery novel will intrigue any reader.

ミステリー小説はすべての読者を魅了するでしょう。

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。

A1 preposition/adverb/adjective/noun /ˌɪnˈsaɪd/

inside

幸せ

Meaning

Situated within something; the inner part of something.

Example

She waited inside the house until the rain stopped.

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ませんでした。

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。

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 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 adjective, noun /ɪnˈdɪkətɪv/

indicative

指示的

Meaning

Serving as a sign or expression of something; in grammar, a mood used to make factual statements.

Example

His tone was indicative of his frustration.

彼のトーンは彼のフラストレーションを示していた。

C1 noun /ɪnˈvɜːrʒən/

inversion

逆転

Meaning

A reversal of the normal order, position, or relationship.

Example

In poetry, inversion is often used to create emphasis.

詩では、逆転は強調を作るためによく使われます。

A2 noun /ˈɪʃ.uːz/

issues

問題

Meaning

Important topics or problems for debate or discussion.

Example

Health issues from pollution are increasing.

汚染による健康問題が増加しています。

B1 adjective /ɪˈnɪʃəl/

initial

初期の

Meaning

Existing or occurring at the beginning.

Example

Her initial reaction was one of surprise.

彼女の初期の反応は驚きだった。

C1 adjective /ɪmˈpɛtʃ.u.əs/

impetuous

衝動的な

Meaning

Acting or done quickly and without thought or care; impulsive.

Example

His impetuous decision led to unexpected consequences.

彼の衝動的な決断は予想外の結果を招いた。

C2 adverb /ˈɪntʃmiːl/

inchmeal

少しずつ

Meaning

Gradually, little by little.

Example

The old castle fell inchmeal into ruin.

その古い城は少しずつ廃墟になった。

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 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。

C1 verb /ɪnˈfrɪndʒ/

infringe

侵害する

Meaning

To actively break the terms of a law, agreement, or right.

Example

Copying this software without permission will infringe copyright laws.

許可なくこのソフトウェアをコピーすると著作権法を侵害することになります。

C2 verb /ɜːrk/

irk

苛立たせる

Meaning

to annoy or irritate someone

Example

It irks me when people are late without calling.

人々が電話をかけずに遅れると、私はイライラします。

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。

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.

C2 adverb /ˈaɪsɪli/

icily

冷たく

Meaning

In a very cold, unfriendly, or hostile manner.

Example

She replied icily to his question.

彼女は冷たく彼の質問に答えた。

B2 adjective ˌɪnstrəˈmɛntl

instrumental

重要な

Meaning

Serving as a crucial means, agent, or tool; having a part in bringing about a result.

Example

Children can be instrumental in building a better society.

子供たちは、より良い社会を作るために重要な役割を果たすことができます。

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。

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。

C1 adjective /ɪˈlʌstriəs/

illustrious

著名

Meaning

Well known, respected, and admired for past achievements.

Example

She had an illustrious career in medicine.

彼女は医学の分野で著名なキャリアを持っていた。

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。

A2 adjective /ˈɪntrəstɪd/

interested

興味がある

Meaning

Showing curiosity or concern about something.

Example

She is very interested in learning new languages.

彼女は新しい言語を学ぶことにとても興味がある。

C2 adjective /ɪnˈdɛkərəs/

indecorous

不作法

Meaning

Not in keeping with good taste and propriety; improper.

Example

His indecorous behavior shocked the audience.

彼の不作法な振る舞いは観客を驚かせた。

C2 adjective /ˌɪnkəˈməʊdiəs/

incommodious

不快な

Meaning

Uncomfortably small, cramped, or inconvenient.

Example

We had to stay in an incommodious room during the trip.

旅行中に不快な部屋に泊まらなければなりませんでした。

B2 noun /ˈaɪrəni/

irony

皮肉

Meaning

a situation that is strange or amusing because it is the opposite of what is expected; the use of words to convey the opposite meaning

Example

The irony of the situation was that the winner forgot his own prize.

その状況の皮肉は、勝者が自分の賞を忘れたことでした。

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。

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。

B2 noun /ˌɪntərˈsɛkʃən/

intersection

交差点

Meaning

a point where two or more things intersect, especially a road or path

Example

The intersection of Main Street and 5th Avenue is always busy.

メインストリートと5番街の交差点はいつも混んでいます。

C2 noun /ˈɪɡ.nəˌmɪn.i/

ignominy

恥辱

Meaning

Public shame, disgrace, or dishonor.

Example

He lived the rest of his life in ignominy after the scandal.

スキャンダル後、彼は生涯を恥辱の中で過ごした。

C2 adjective /ˈɪm.pi.əs/

Impious

不敬な; 冒涜的

Meaning

irreligious; lacking reverence for religion; blasphemous

Example

The impious act shocked the religious community.

不敬な行為は宗教コミュニティを驚かせました。

B2 adjective /ɪnˈvɪz.ə.bəl/

Invisible

見えない

Meaning

unable to be seen; not visible to the eye

Example

The bacteria are invisible without a microscope.

細菌は顕微鏡なしでは見えません。

C2 noun /ˌɪntərˈlɒkjətər/

interlocutor

対話者

Meaning

a person who takes part in a conversation or dialogue

Example

She was a skilled interlocutor during the debate.

彼女は討論中に優れた対話者でした。

C1 adjective /ɪnˈdiːsənt/

indecent

不品な

Meaning

not conforming to accepted standards of behavior or morality; improper or offensive

Example

He was warned for making an indecent remark during the meeting.

彼は不品な発言で注意された。

C2 adjective /ˌɪnkənˈsɪdərəbl/

inconsiderable

取るに足らない

Meaning

Too small or unimportant to be worth considering.

Example

The donation was not inconsiderable, though smaller than expected.

寄付は取るに足らなかったが、予想よりも小さかった。

C2 adjective /ɪnˈvaɪələt/

inviolate

汚されていない

Meaning

free from violation, injury, or desecration; kept safe and untouched

Example

The ancient temple remained inviolate for centuries.

古代の寺院は何世紀にもわたって汚されることなく保たれました。

C2 noun /ˌɪrɪˈdɛsəns/

iridescence

虹色の輝き

Meaning

a play of lustrous, changing colors like those of a rainbow

Example

The butterfly's wings shimmered with iridescence.

蝶の羽は虹色の輝きで輝いていました。

C1 adjective /ˌɪndɪˈspjuːtəbəl/

Indisputable

議論の余地がない; 否定できない; 確定的

Meaning

impossible to deny or argue against; undeniable; certain

Example

The evidence against him was indisputable.

彼に対する証拠は議論の余地がなかった。

C1 noun ɪnˈsɒl.vən.si

insolvency

破産

Meaning

The state of being unable to pay debts owed; bankruptcy.

Example

The company declared insolvency after years of losses.

その会社は多くの損失の後、破産を宣言した。