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C1 noun /ˈɪŋ.krə.mənt/

Increment

増加
Meaning
an increase or addition, especially one of a series on a fixed scale; a regular increase in salary
Example
He received an annual increment of five percent in his salary this year.
彼は今年、自分の給料に5パーセントの年次増加を受け取った。
C1 noun /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 /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。
B2 noun /ɪnˈsɪstəns/

insistence

強い要求
Meaning
the act of demanding something firmly or repeatedly
Example
At his insistence, we stayed longer.
彼の強い要求で、私たちは長く滞在しました。
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 verb /ɪnˈkɜːr/

incur

負う
Meaning
To bring upon oneself something undesirable, usually as a result of actions.
Example
He incurred a fine for parking in the wrong place.
彼は間違った場所に駐車して罰金を科せられた。
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。
B2 verb /ɪmˈplaɪ/

imply

暗示する
Meaning
To suggest something without directly stating it.
Example
Her tone seemed to imply that she was upset.
彼女の口調は、彼女が怒っていることを示唆しているようでした。
C1 adjective /ɪˈledʒ.ə.bəl/

illegible

読めない
Meaning
Not clear enough to be read; unreadable.
Example
The doctor’s handwriting was almost illegible.
医者の手書きはほとんど読めなかった。
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。
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。
C1 adjective ˌɪn.təˈmɪt.ənt

intermittent

断続的
Meaning
Happening irregularly, not continuously.
Example
The rain was intermittent throughout the day.
雨は一日中断続的でした。
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。
C2 noun /ˌɪməʊˈbɪləti/

immobility

不動
Meaning
The state of being unable to move.
Example
After the accident, she suffered from immobility in her legs.
事故の後、彼女は足の不動に苦しみました。
B2 noun ˈɪndɪkeɪtə

indicator

指標
Meaning
A thing that indicates the state or level of something.
Example
The unemployment rate is a key indicator of economic health.
失業率は経済の健康の重要な指標です。
C2 noun /ˌɪdiəˈsɪŋkrəsi/

idiosyncrasy

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

interrogatory

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

interim

暫定的
Meaning
In or for the intervening period; provisional or temporary.
Example
Interim governments manage transitional phases.
暫定政府は移行段階を管理します。
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。
C2 noun /ˈɪntərˌveɪl/

intervale

川沿いの低地、通常は肥沃で平坦
Meaning
A low-lying tract of land along a river, usually fertile and flat.
Example
The farmers cultivated crops on the lush intervale by the river.
農民たちは川沿いの肥沃な土地で作物を育てた。
C2 verb /ɪˈnjʊər/

inure

慣れる
Meaning
To become accustomed to something, especially something unpleasant.
Example
Soldiers quickly became inured to the harsh conditions.
兵士たちはすぐに過酷な状況に慣れました。
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 adjective /ɪmˈpæsɪv/

impassive

無表情
Meaning
Not showing or feeling emotion; expressionless.
Example
Despite the shocking news, she remained impassive.
衝撃的なニュースにもかかわらず、彼女は無表情のままでした。
C2 verb /ˌɪntərˈlɒk/

interlock

かみあう
Meaning
to fit or connect together securely so that two or more things are joined
Example
The gears interlock to ensure smooth movement of the machine.
ギアは機械のスムーズな動作を確保するために噛み合います。
B1 verb /ˈɪndɪkeɪt/

indicate

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

indiscriminate

無差別
Meaning
Done without careful judgment; random or haphazard.
Example
The indiscriminate use of pesticides harms the environment.
農薬の無差別な使用は環境に害を与えます。
C2 noun /ɪˈrʌp.ʃən/

Irruption

突然の暴力的な侵入; 侵略または襲撃; 突然の噴出または噴火
Meaning
a sudden violent entry; an invasion or raid; a sudden outburst or eruption
Example
The army's irruption into enemy territory caught the opposing forces completely off guard.
軍隊の敵領土へのイラプションは、相手の力を完全に不意を突いた。
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。
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 /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。
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。
C2 noun /ˈɪn.tɪ.ɡreɪ.tɪv dɪˈpləʊ.mə.si/

integrative diplomacy

統合的外交
Meaning
A diplomatic approach that seeks to combine or coordinate different elements, interests, or parties into a unified whole.
Example
Integrative diplomacy strengthens alliances.
統合的外交は同盟を強化する。
C2 adjective /ɪnˈtræn.sɪ.dʒənt/

intransigent

頑固な, 譲らない, 固執した
Meaning
Unwilling or refusing to change one's views or to agree about something.
Example
His intransigent stance delayed the agreement.
彼の頑固な態度が合意を遅らせました。
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。
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。
B2 noun /ɪmˈpeɪʃəns/

impatience

忍耐力不足
Meaning
The state of being quickly irritated or unable to wait calmly.
Example
His impatience grew as the meeting dragged on.
会議が長引くにつれて、彼の忍耐力不足が増しました。
A2 noun /ˈaɪ.lənd/

Island

島
Meaning
a piece of land completely surrounded by water
Example
We visited a beautiful island during our vacation.
私たちは休暇中に美しい島を訪れました。
C1 noun /ɪnˈædɪkwəsi/

inadequacy

不十分さ
Meaning
lack of sufficient ability, quality, or strength; a feeling of not being good enough
Example
She struggled with feelings of inadequacy at work despite her strong qualifications.
十分な資格があるにもかかわらず、彼女は職場で不十分さを感じていた。
B2 verb /ˈɪr.ɪ.teɪt/

irritate

イライラさせる
Meaning
To make someone annoyed or angry; to cause discomfort or inflammation.
Example
Rubbing your eyes can irritate them.
目をこすると、それが刺激になることがあります。
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。
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。
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。
C2 noun /ɪnˈtɛnʃən/

intension

内的意味
Meaning
The internal content of a concept; the set of attributes implied by a word or phrase.
Example
The intension of the word 'dog' includes being a mammal and domesticated.
'犬'という言葉のインテンションには哺乳類であり、飼いならされたことが含まれます。
C2 noun /ɪmˈprɑːvɪdəns/

improvidence

不注意
Meaning
Lack of foresight or care for future needs.
Example
His improvidence led to financial difficulties.
彼の不注意が彼を財政的な困難に追い込んだ。
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。
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。
C2 adjective /ɪˈmɒdɪst/

immodest

傲慢 / 不適切
Meaning
lacking humility or decency; excessively proud or improper
Example
His immodest remarks offended the audience.
彼の傲慢な発言は観客を不快にさせた。
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 noun /ɪˌreɡjəˈlærɪti/

irregularity

不規則性
Meaning
lack of regularity or consistency; a deviation from what is normal, expected, or orderly
Example
The audit revealed several financial irregularities in the company’s records.
監査により、その会社の記録にいくつかの財務上の不規則性が明らかになった。
C2 adjective /ɪnˈɛksərəbl/

inexorable

避けられない
Meaning
Impossible to stop or prevent; relentless.
Example
The inexorable rise of technology is changing every aspect of life.
テクノロジーの避けられない上昇は、生活のすべての側面を変えています。
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。
B2 verb /ɪnˈsɜːrt/

insert

挿入する
Meaning
to put or place something into something else
Example
Please insert the key into the lock.
鍵をロックに挿入してください。
C2 verb /ɪˈluːmɪn/

illumine

照らす
Meaning
to light up or make clear
Example
The rising sun illumined the mountain peaks.
昇る太陽が山頂を照らした。
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 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。
B2 noun /ˈɪn.flu.ən.sər/

Influencer

インフルエンサー, 商品を勧める人
Meaning
A person with the ability to influence potential buyers of a product or service by promoting or recommending the items on social media.
Example
Social media influencers shape consumer preferences.
ソーシャルメディアのインフルエンサーは消費者の好みを形作っています。
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 /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 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。
C1 noun /ˈaɪsətəʊp/

isotope

同位体
Meaning
Atoms of the same element with equal number of protons but different numbers of neutrons.
Example
Carbon-14 is a radioactive isotope used in dating fossils.
炭素-14は化石の年代を測定するために使用される放射性同位体です。
A1 noun /ˈaɪs kriːm/

Ice-cream

アイスクリーム
Meaning
a frozen sweet dessert made from dairy products, usually served cold
Example
Children love to eat ice-cream on hot summer days.
子供たちは暑い夏の日にアイスクリームを食べるのが好きです。
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。
C2 noun /ˈɪnfəmi/

infamy

幸福
Meaning
the state of being well known for some bad quality or deed
Example
His name will live in infamy for the crimes he committed.
彼女は賞を受け取ったとき、自分の幸福を隠すことができなかった。
C2 verb /ɪnˈdɛmnɪfaɪ/

indemnify

Meaning
to compensate someone for harm or loss; to secure against future damage or cost
Example
The insurance company agreed to indemnify the client for the damages.
B2 noun, verb /ˌɪnkənˈviːniəns/

inconvenience

不便
Meaning
trouble or difficulty caused to someone; to cause trouble or difficulty to someone
Example
We apologize for any inconvenience caused by the delay.
遅延によって生じた不便についてお詫びします。
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。
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。
C2 noun /ɪmˈpjuːɪsəns/

impuissance

無力, 無能
Meaning
inability to take effective action; helplessness
Example
The government’s impuissance in the face of crisis frustrated the people.
危機の前で政府の無力さが人々を失望させた。
C2 adjective /aɪˈtɪnərənt/

itinerant

旅する
Meaning
Traveling from place to place, especially for work or duty.
Example
The itinerant teacher moved from village to village to educate children.
その旅する教師は村から村へと移動して子供たちに教育をしていました。
C2 adjective /ˌɪɡ.nəˈmɪn.i.əs/

ignominious

不名誉な
Meaning
Marked by shame, disgrace, or humiliation.
Example
The team suffered an ignominious defeat in the finals.
チームは決勝で不名誉な敗北を喫した。
C1 adjective /ɪnˈtjuː.ɪ.tɪv/

intuitive

直感的
Meaning
Based on instinctive understanding rather than reasoning.
Example
The software has an intuitive design that makes it easy to use.
そのソフトウェアは直感的なデザインを持っており、使いやすいです。
C1 adjective /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。
B1 adjective ˌɪn.dɪˈpen.dənt

independent

独立
Meaning
Not depending on another for livelihood or subsistence; free from outside control; not subject to another's authority.
Example
An independent institution ensures transparency in governance.
独立した機関は、ガバナンスの透明性を保証します。
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 adjective /ˌɪrɪˈvɜːrsəbl/

irreversible

不可逆な
Meaning
Not able to be undone, changed, or reversed.
Example
The damage caused by the fire was irreversible.
火事によって生じた損害は不可逆でした。
A1 preposition /ˈɪntuː/

into

中へ
Meaning
expressing movement or direction to the inside of something
Example
She walked into the room quietly.
彼女は静かに部屋に入った。
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。
C2 adjective ɪˈnɛfəbl

ineffable

言葉で表現できない
Meaning
Too great or extreme to be expressed or described in words.
Example
The beauty of the landscape was ineffable.
その景色の美しさは言葉で表現できなかった。
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。
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。
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 /ˌɪnɪkˈstɛnsəbl/

inextensible

伸縮不可
Meaning
Not capable of being stretched or extended.
Example
This rope is made of an inextensible material.
このロープは伸縮不可の材料でできています。
C2 noun /ˈɪndɪkənt/

indicant

指標
Meaning
Something that indicates or points to a fact or condition.
Example
High fever is often an indicant of infection.
高熱はしばしば感染の指標となります。
C1 adjective ɪnˈsaɪ.sɪv

incisive

鋭い
Meaning
Intelligently analytical and clear-thinking; showing clear thought and good understanding of what is important.
Example
His incisive comments revealed the core issues.
彼の鋭いコメントは核心的な問題を明らかにしました。
C1 noun /ˌɪn.dɪˈsɪʒ.ən/

Indecision

優柔不断; 決断力の欠如; 迷い
Meaning
the inability to make decisions quickly; uncertainty about what to do
Example
Her indecision about which job offer to accept caused her to miss both opportunities.
どの仕事のオファーを受けるかについての優柔不断さが、両方のチャンスを逃す原因となった。
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。
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。
A2 noun/adjective /ˌɪndɪˈvɪdʒuəl/

individual

個人
Meaning
A single human being as distinct from a group; relating to one person.
Example
Each individual has the right to freedom of speech.
各個人には表現の自由がある。
B1 verb /ɪnˈvɛs.tɪ.ɡeɪt/

investigate

調査する
Meaning
to carry out a systematic inquiry to discover facts or information
Example
The police will investigate the incident thoroughly.
警察は事件を徹底的に調査するでしょう。
C2 adjective /ˌɪnɪkˈstrɪkəbl/

inextricable

分けられない
Meaning
Impossible to separate or escape from.
Example
The two friends shared an inextricable bond.
二人の友達は分けられない絆を共有していた。
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。
B2 adjective /ɪˈmædʒɪnəbl/

imaginable

想像できる
Meaning
Capable of being imagined or conceived.
Example
They offered every imaginable type of food at the festival.
彼らはフェスティバルであらゆる想像できるタイプの食べ物を提供しました。
C2 adjective /ˌɪn.trəˈmjʊə.rəl/

intramural

学内
Meaning
Occurring within the walls of a single institution, especially a school or college.
Example
The college organizes intramural sports competitions every semester.
大学は毎学期、学内スポーツ競技を開催しています。
B2 noun ɪnˈtɛɡrɪti

integrity

誠実
Meaning
The quality of being honest and having strong moral principles; moral uprightness.
Example
Teachers' integrity fosters a positive learning environment.
教師のインテグリティは、積極的な学習環境を促進します。
C1 verb /ɪnˈfɛst/

infest

侵入する
Meaning
to overrun in large numbers, especially so as to cause damage or discomfort
Example
The old house was infested with rats.
古い家はネズミで侵されていました。
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 /ɪnˈflæməbəl/

Inflammable

可燃; 発火性
Meaning
easily set on fire; flammable; combustible
Example
The inflammable material caught fire quickly.
その可燃性材料はすぐに火をつけました。
B2 verb /ɪnˈflɪkt/

inflict

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

illicit

不法な
Meaning
Forbidden by law, rules, or custom.
Example
The police shut down the illicit drug operation.
警察は不法な麻薬取引を閉鎖しました。
C1 noun ɪnˈdʌldʒəns

indulgence

嗜好
Meaning
The practice of allowing oneself to enjoy the pleasure of something.
Example
His indulgence in junk food affected his health.
彼のジャンクフードへの過度の嗜好は健康を害した。
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 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。
C1 noun /ɪˌluːmɪˈneɪʃən/

illumination

Meaning
the act of lighting something or making something clear
Example
The street was filled with bright illumination from the lamps.
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。
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 /ˈɪrɪtəbl/

irritable

Meaning
easily annoyed or made angry
Example
She became irritable after working long hours without rest.
C2 adjective /ˌɪnɪkˈsprɛsəbl/

inexpressible

言葉では表現できない
Meaning
Too strong or extreme to be expressed in words.
Example
She felt inexpressible joy at the news of her success.
彼女は成功の知らせを聞いて言葉では表現できない喜びを感じた。
B2 noun /ɪnˈsen.tɪv/

Incentive

インセンティブ; 刺激
Meaning
a thing that motivates or encourages someone to do something; a reward or penalty that influences behavior
Example
The company offered a cash incentive to employees who exceeded their sales targets.
その会社は売上目標を達成した従業員に現金インセンティブを提供しました。
B2 noun /ɪnˈventər/

inventor

発明家
Meaning
a person who creates or designs something new, especially a device, method, or process
Example
The inventor patented her new medical device.
その発明家は新しい医療機器の特許を取得した。
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。
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 noun /ˈaɪ.ərn.wʊd/

Ironwood

アイアンウッド
Meaning
a hard, dense wood from various trees; also the tree itself that produces small flowers
Example
The ironwood tree blooms with tiny white flowers.
アイアンウッドの木は小さな白い花を咲かせます。
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。
B2 noun /ɪnˈtɪəriər/

interior

インテリア
Meaning
the inside part of something; inner area of a place or object
Example
The interior of the hotel was beautifully decorated.
ホテルのインテリアは美しく装飾されていました。