Insanity
All a b c d e f g h i j k l m n o p q r s t u v w x y z
All CEFR A1 A2 B1 B2 C1 C2
Content locale
EN 英語 BN ベンガル語 HI ヒンディー語 ES スペイン語 FR フランス語 DE ドイツ語 RU ロシア語 ZH 中国語 JA 日本語
All Vocabulary Cards All Vocabularies
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 /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。
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 adjective /ˌɪnˌkɒnsɪˈkwɛnʃəl/

inconsequential

重要でない
Meaning
Not important or significant; too small to matter.
Example
The mistake was minor and inconsequential.
その間違いは小さく、重要ではありませんでした。
C2 noun /ˈɪsməs/ or /ˈɪsθməs/

isthmus

地峡
Meaning
A narrow strip of land connecting two larger land areas, often with water on either side.
Example
The Panama Canal cuts through the Isthmus of Panama.
パナマ運河はパナマの地峡を通ります。
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。
B1 noun ɪnˈvestmənt

investment

投資
Meaning
The action or process of investing money for profit or material result.
Example
Investment in waste management infrastructure is essential.
廃棄物管理インフラへの投資は不可欠です。
C1 verb /ɪnˈhɪbɪt/

inhibit

抑制する
Meaning
to prevent or restrain someone or something from acting freely; to hinder
Example
Fear can inhibit personal growth.
恐怖は個人の成長を抑制する可能性があります。
C2 adjective /ˌɪnæprɪˈhɛnsəbl/

inapprehensible

理解不能
Meaning
not understandable; incomprehensible
Example
The concept was so abstract that it seemed inapprehensible to most students.
その概念は非常に抽象的で、ほとんどの学生には理解できないように思えた。
C1 verb /aɪˈdiː.ə.laɪz/

idealize

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

insubordination

反抗
Meaning
Defiance of authority; refusal to obey orders.
Example
The soldier was punished for insubordination during the mission.
その兵士はミッション中の反抗で罰せられました。
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。
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。
C2 noun /ɪnˈsɪpiəns/

incipience

始まり
Meaning
the beginning or initial stage of something
Example
The project was still in its incipience when funding was approved.
資金提供が承認された時、プロジェクトはまだその始まりの段階にありました。
C2 noun /ɪnˈfriːkwəns/

infrequence

稀少性
Meaning
The state of occurring rarely or at long intervals.
Example
The infrequence of their meetings made it hard to maintain close ties.
彼らの会議の稀少性は、親密な関係を維持するのを難しくしていました。
B2 noun /ɪnˈvɒlvmənt/

involvement

関与
Meaning
the act of taking part in something
Example
His involvement in the project was crucial.
彼のプロジェクトへの関与は重要だった。
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。
C2 noun /ɪˈnænɪti/

inanity

馬鹿げたこと, 空虚
Meaning
a nonsensical remark or action; silliness; emptiness
Example
The speech was full of inanities that bored the audience.
スピーチは聴衆を退屈させる馬鹿げたことだらけだった。
C2 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。
A2 verb /ˌɪntrəˈduːs/

introduce

紹介する
Meaning
to present someone; to bring in for the first time
Example
Let me introduce you to my friend.
友達を紹介させてください。
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; 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。
C1 verb /ˈɪnstɪˌɡeɪt/

instigate

扇動する
Meaning
To bring about or initiate an action, often something negative.
Example
He was accused of instigating the riot.
彼は暴動を扇動したとして告発された。
B2 verb /ɪnˈfɛkt/

infect

感染させる
Meaning
To contaminate with a disease-causing organism.
Example
The virus can infect healthy people quickly.
ウイルスは健康な人々を迅速に感染させることができます。
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。
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。
C2 adjective /ɪˈrɛzəluːt/

irresolute

優柔不断
Meaning
uncertain or indecisive; lacking determination
Example
He stood irresolute at the crossroads, unsure which path to take.
彼は交差点で優柔不断に立ち、どの道を取るべきか決められなかった。
C1 adjective /ɪmˈpɜːmiəbl/

impermeable

不透水の
Meaning
Not allowing fluid or gas to pass through.
Example
The container is made of impermeable plastic.
その容器は不透水のプラスチックでできています。
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 adjective /ˌɪrɪˈmiːdiəbl̩/

irremediable

修復不可能
Meaning
Impossible to cure, repair, or remedy.
Example
The damage to the ancient manuscript was irremediable.
古代の写本への損傷は修復不可能でした。
C2 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
B1 noun /ɪnˌvɛs.tɪˈɡeɪ.ʃən/

investigation

調査
Meaning
the process of inquiring into or examining something carefully to find the truth
Example
The investigation revealed new evidence about the fraud.
調査は詐欺に関する新しい証拠を明らかにしました。
B1 verb /ɪnˈsɪst/

insist

主張する
Meaning
to demand firmly; to state persistently
Example
He insisted on paying the bill.
彼は請求書の支払いを主張しました。
C2 adjective /ˌɪrɪˈdɛsənt/

iridescent

虹色の
Meaning
showing luminous colors that seem to change when seen from different angles
Example
She wore an iridescent dress that sparkled in the light.
彼女は光の中で輝く虹色のドレスを着ていました。
B2 noun /ˌɪn.dɪˈkeɪ.ʃən/

Indication

指示; 合図
Meaning
a sign or piece of information that indicates something; a suggestion or hint
Example
The dark clouds were a clear indication that a storm was approaching the area.
暗い雲は嵐がその地域に近づいていることを示す明確な指示でした。
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。
C2 adjective /ɪmˈplækəbl/

implacable

容赦しない
Meaning
unable to be appeased, calmed, or pacified
Example
The soldiers faced an implacable enemy who refused to surrender.
兵士たちは降伏を拒否した容赦しない敵に直面した。
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。
C1 noun /ˈɪnkwest/

inquest

調査
Meaning
A legal or official inquiry, especially into the cause of a death.
Example
The inquest revealed the cause of the accident.
調査は事故の原因を明らかにしました。
B2 noun /ɪnˈspekʃən/

inspection

検査
Meaning
a careful examination of something, especially to check that it is correct or safe
Example
The building passed the safety inspection last week.
その建物は先週、安全検査に合格しました。
A2 adjective /ɪmˈpɑːsəbl/

impossible

不可能
Meaning
not able to occur, exist, or be done
Example
It is impossible to finish this work in one day.
この仕事を1日で終わらせるのは不可能です。
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。
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。
C1 verb /ɪnˈdʌkt/

induct

Meaning
to formally admit someone into a position, organization, or office
Example
She was inducted into the university's honor society.
C2 adjective /ˌɪrɪˈkɒnsɪləbl/

irreconcilable

和解できない
Meaning
impossible to make compatible or bring into harmony; unable to resolve differences
Example
The couple separated due to irreconcilable differences.
そのカップルは和解できない違いのために別れました。
C2 verb /ɪnˈtɜːr/

inter

埋葬する
Meaning
To bury a dead body in the ground.
Example
They decided to inter the soldier with full honors.
彼らは兵士を全ての名誉を持って埋葬することに決めた。
C2 noun /aɪˈoʊtə/

iota

微小な量
Meaning
An extremely small amount.
Example
He did not show an iota of fear.
彼は恐怖の一片も見せませんでした。
C1 verb /ɪnˈfjuːz/

infuse

Meaning
to fill or spread through something; to instill a quality, idea, or feeling
Example
The teacher tried to infuse her students with a love for reading.
C2 noun /ˌɪmprɪˈkeɪʃən/

imprecation

呪い
Meaning
A spoken curse or expression of strong condemnation.
Example
The angry crowd hurled imprecations at the corrupt official.
怒った群衆は腐敗した役人に呪いを投げかけた。
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。
A2 adverb /ɪnˈstɛd/

instead

代わりに
Meaning
As an alternative or substitute.
Example
She didn’t buy the dress; instead, she chose a pair of shoes.
彼女はドレスを買わなかった。代わりに、彼女は靴を選んだ。
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。
B2 adjective /ɪnˈdɪf.ər.ənt/

indifferent

無関心
Meaning
having no particular interest or concern; not caring one way or another
Example
She was indifferent to the outcome of the match.
彼女は試合の結果に無関心だった。
C2 noun /ˌɪnvəˈluːʃən/

involution

インヴォリューション
Meaning
a complicated or intricate form or state; in biology, the shrinking of an organ after its function has finished
Example
The story was full of involution, making it hard to follow.
その話はインヴォリューションで満ちており、追うのが難しかった。
B1 noun /ˈɪnstəns/

instance

例
Meaning
An example or single occurrence of something.
Example
This is just one instance of his generosity.
これは彼の寛大さの一例です。
C2 adjective /ɪnˈfɜːrnəl/

infernal

地獄の
Meaning
relating to hell; extremely troublesome or annoying
Example
The workers complained about the infernal noise from the construction site.
労働者たちは建設現場からの地獄のような騒音について文句を言った。
B2 adjective /ɪnˈsɛnsətɪv/

insensitive

無神経な
Meaning
Showing or feeling no concern for others' feelings.
Example
His insensitive comment hurt her deeply.
彼の無神経なコメントは彼女を深く傷つけました。
C1 noun /ɪnˈsɜːrdʒəns/

insurgence

反乱
Meaning
An act of rebellion or uprising against authority.
Example
The government struggled to contain the growing insurgence.
政府は増大する反乱を抑制するのに苦労した。
C2 adjective /ˌɪm.pəˈfɛk.tə.bəl/

imperfectible

インパーフェクティブル
Meaning
Incapable of being made perfect or complete.
Example
Some human qualities are considered imperfectible.
いくつかの人間の資質は、完璧にはならないと見なされます。
B2 verb /ɪmˈpoʊzd/

imposed

課す
Meaning
forced something to be accepted or put in place
Example
The government imposed new regulations on the industry.
政府は産業に新しい規制を課した。
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 adjective /ɪnˈkluːsɪv/

inclusive

包括的
Meaning
Including all the services, facilities, or items normally expected or required; not excluding any section of society or any party involved.
Example
Inclusive growth benefits all sections of society.
包括的な成長は、社会のすべての層に利益をもたらします。
C2 noun /ɪnˈvɛstɪtʃər/

investiture

任命式
Meaning
the formal ceremony of conferring authority, rank, or office
Example
The king held an investiture ceremony for the new knight.
王は新しい騎士のために任命式を開催しました。
A2 noun /ˈɪlnəs/

illness

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

imposes

課す
Meaning
To establish or apply by authority; to force something unwelcome or unfamiliar to be accepted or put in place.
Example
Pollution imposes harmful effects on the environment.
汚染は環境に有害な影響を課します。
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。
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。
C2 noun /ɪnˈɛrənsi/

inerrancy

無謬性
Meaning
the belief or quality of being free from error; absolute correctness
Example
Some religious groups strongly affirm the inerrancy of their sacred texts.
いくつかの宗教団体は、自分たちの聖典の誤りのなさを強く主張しています。
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。
C2 adjective /ˌɪnkoʊˈɜːrsəbl̩/

incoercible

強制できない
Meaning
Not capable of being forced, compelled, or restrained.
Example
Her incoercible spirit inspired others to fight for justice.
彼女の強制できない精神は他の人々に正義のために戦うようにインスパイアした。
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 ɪnˌten.sɪ.fɪˈkeɪ.ʃən

intensification

強化
Meaning
The process of becoming or making something more intense or extreme.
Example
The intensification of climate change requires urgent action.
気候変動の強化は緊急の行動を必要とします。
B2 adverb /ɪnˈɛvɪtəbli/

inevitably

避けられない
Meaning
in a way that cannot be avoided or prevented
Example
Inevitably, the team faced challenges during the project.
避けられないことに、チームはプロジェクト中に挑戦に直面しました。
B2 adjective /aɪˈdentɪkəl/

Identical

同一の; 全く同じ
Meaning
exactly the same; not different in any way
Example
The twins look completely identical to each other.
双子は完全に同じに見えます。
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。
B2 noun ˌɪr.ɪˈɡeɪ.ʃən

irrigation

灌漑
Meaning
The artificial application of water to land or soil.
Example
Irrigation systems improve crop yields in dry regions.
灌漑システムは乾燥した地域で作物の収穫量を増加させます。
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.
A2 verb /ɪnˈvaɪt/

invite

招待する
Meaning
to ask someone to come to an event or to do something
Example
We should invite all our friends to the party.
パーティーに友達を招待するべきです。
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。
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。
B2 verb /ˈɪnəveɪt/

innovate

革新
Meaning
To introduce new methods, ideas, or products.
Example
The company must innovate to stay ahead of its competitors.
その企業は競争相手を追い越すために革新を続けなければならない。
C2 adjective ɪnˈfiː.zə.bəl

infeasible

不可能
Meaning
Not possible to do easily or conveniently; impracticable.
Example
Restoring the forest may become infeasible if destruction continues.
森林の回復は、破壊が続くと不可能になる可能性があります。
B1 adjective /ɪnˈtɜːrnəl/

internal

内部
Meaning
situated inside; relating to the inside or inner part of something
Example
The company is conducting an internal audit this month.
その会社は今月内部監査を行っています。
C2 noun /ˌɪnkənˈɡruːəti/

incongruity

不一致
Meaning
The state of being inconsistent or out of place.
Example
The incongruity of his cheerful mood during the funeral shocked everyone.
葬式の最中に彼の陽気な気分の不一致は、皆を驚かせました。
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。
B2 adjective /ɪˈrɪˌspɑn.sə.bəl/

Irresponsible

無責任
Meaning
lacking a sense of responsibility; careless
Example
It was irresponsible of him to leave without telling anyone.
彼が誰にも言わずに去ったのは無責任だった。
B1 noun aɪˈdɛntɪti

identity

アイデンティティ
Meaning
The fact of being who or what a person or thing is; the characteristics determining who or what a person or thing is.
Example
The day reinforces our national identity.
その日は私たちの国民的アイデンティティを強化します。
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。
C1 adjective ˈɪn.lənd

Inland

内陸
Meaning
Situated in the interior of a country; away from the coast.
Example
Inland transport boosts local trade.
内陸輸送は地元の貿易を促進します。
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。
B2 noun /ˈɪn.vɔɪs/

Invoice

請求書
Meaning
a list of goods sent or services provided, with a statement of the sum due for these
Example
The company sent an invoice for the office supplies delivered last week.
会社は先週配送されたオフィス用品の請求書を送付しました。
B1 noun ˈɪmpækt

impact

影響
Meaning
A strong effect or influence; the action of one object coming forcibly into contact with another.
Example
The decision had great impact.
その決定は大きな影響を与えた。
C2 verb /ˌɪntərˈsiːd/

intercede

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

incapacity

無能力
Meaning
the lack of ability, power, or fitness to do something
Example
His mental incapacity prevented him from making important decisions.
彼の精神的無能力は、重要な決定を下すのを妨げました。
C1 verb /ɪmˈpɛrɪl/

imperil

危険にさらす
Meaning
To put in danger or at risk.
Example
Reckless driving can imperil the lives of others.
無謀な運転は他人の命を危険にさらす可能性があります。
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 /aɪˌdɛntɪfɪˈkeɪʃən/

identification

身分証明
Meaning
the process of recognizing or proving who or what someone or something is
Example
You need proper identification to enter the building.
ビルに入るには適切な身分証明が必要です。
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 /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。
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 /ɪnˈkɒmpɪtəns/

incompetence

無能
Meaning
Lack of ability, skill, or effectiveness in doing something.
Example
The project failed due to the manager’s incompetence.
プロジェクトはマネージャーの無能のため失敗しました。
C2 noun /ˈɪn.fɪ.del/

Infidel

異教徒
Meaning
a person who does not believe in religion or whose religious beliefs differ from one's own
Example
In historical contexts, crusaders often referred to their enemies as infidels.
歴史的な文脈では、十字軍はしばしば自分たちの敵を異教徒と呼んでいました。
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 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 verb /ɪnˈkrɪmɪˌneɪt/

incriminate

有罪にする
Meaning
to make someone appear guilty of a crime or wrongdoing
Example
The new evidence could incriminate the suspect in the robbery case.
新しい証拠がロビー事件の容疑者を有罪にする可能性があります。
B2 noun /ˈɪnˌsaɪt/

insight

洞察力
Meaning
The ability to understand the true nature of something; deep understanding.
Example
Her insight into human behavior made her a successful psychologist.
彼女の人間行動に対する洞察力は、彼女を成功した心理学者にした。
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。
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。
C1 adjective /ɪnˈflæməˌtɔːri/

inflammatory

幸せ
Meaning
causing inflammation in the body; arousing anger, hostility, or strong emotion
Example
His inflammatory speech triggered protests across the city.
彼女は賞を受け取ったとき、幸せそうな表情を隠せなかった。
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。
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。
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。
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。
A2 noun /ɪŋk/

Ink

インク
Meaning
a colored fluid used for writing, drawing, or printing; a dark liquid ejected by cuttlefish
Example
The old fountain pen leaked ink all over his white shirt during the meeting.
古い万年筆は会議中に白いシャツにインクをこぼしました。
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 /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。
B1 noun /ɪnˈstrʌkʃənz/

instructions

指示
Meaning
Detailed information on how something should be done or operated.
Example
Please follow the instructions on the box.
箱に書かれた指示に従ってください。
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 /ɪnˈtɛlɪdʒəbl/

intelligible

Meaning
Able to be understood; clear enough to be comprehended.
Example
Her speech was barely intelligible over the noise.
C1 verb /ˈɪmprəvaɪz/

improvise

Meaning
To create or perform something spontaneously without preparation.
Example
The actor had to improvise his lines when he forgot the script.