jurisprudence
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C2 noun /ˌdʒʊərɪsˈpruːdəns/

jurisprudence

法学
Meaning
The theory, philosophy, or science of law.
Example
She is a professor of jurisprudence at the university.
彼女は大学で法学の教授です。
C1 noun /ˈdʒɑːr.ɡən/

jargon

専門用語
Meaning
Specialized or technical language used by a particular group or profession.
Example
The lawyer’s explanation was full of legal jargon.
弁護士の説明は法律専門用語でいっぱいでした。
C1 noun /ˌdʒæm.bəˈriː/

Jamboree

祭典; フェスティバル;
Meaning
a large celebration or party; a gathering with entertainment; a festive event
Example
The scout jamboree brought together thousands of young people from around the world.
スカウトジャムボリーは、世界中から数千人の若者たちを集めました。
C1 noun dʒuːˈdɪʃ.ər.i

judiciary

司法制度
Meaning
The judicial authorities of a country; the system of courts that interprets and applies the law.
Example
The judiciary ensures the rule of law.
司法制度は法の支配を保障する。
C1 /ˈdʒɛtɪsən/

jettison

放棄する
Meaning
to throw or drop something from a ship, aircraft, or vehicle to lighten the load; to abandon something no longer wanted
Example
The crew had to jettison cargo to save the sinking ship.
乗組員は沈没している船を救うために貨物を投げ捨てなければならなかった。
C1 noun /ˈdʒet.i/

Jetty

桟橋
Meaning
a landing stage or small pier at which boats can dock or be moored
Example
The fishing boats were tied up at the wooden jetty near the harbor.
漁船は港近くの木製の桟橋に係留されていた。
C2 noun /ˈdʒʌɡləri/

jugglery

ジャグリング
Meaning
The performance of tricks and illusions, especially by sleight of hand.
Example
The magician's jugglery amazed the audience.
魔法使いのジャグリングは観客を驚かせました。
A2 noun /ˈdʒuːəlri/

jewellery

宝石類
Meaning
ornamental items worn for personal adornment, such as rings, necklaces, or bracelets, often made of precious metals or stones
Example
She wore beautiful jewellery to the wedding.
彼女は結婚式で美しい宝石類を身につけていた。
C1 noun /ˈdʒʊərər/

juror

陪審員
Meaning
a member of a jury who is chosen to hear evidence in a legal case and help make a decision
Example
The juror listened carefully to the witness’s testimony.
陪審員は証人の証言を慎重に聞きました。
C1 noun /ˈdʒʌɡ.lər/

Juggler

ジャグラー
Meaning
a person who skillfully throws and catches objects as entertainment
Example
The juggler entertained the crowd with his amazing ball tricks.
ジャグラーは彼の見事なボールさばきで観客を楽しませた。
C1 verb /dʒɒt/

jot

素早く短く書く
Meaning
to write something quickly and briefly
Example
She jotted down his phone number on a napkin.
彼女はナプキンに彼の電話番号を素早く書き留めました。
B2 noun /ˈdʒel.ə.si/

Jealousy

嫉妬; 競争相手に対する憤り
Meaning
a feeling of envy of someone or their achievements; resentment against a rival
Example
His jealousy over his colleague's promotion led to tension in the workplace.
彼の同僚の昇進に対する嫉妬は職場での緊張を引き起こしました。
A2 noun /dʒæm/

Jam

果物と砂糖で作られた甘いスプレッド；難しい状況；詰まり
Meaning
a sweet spread made from fruit and sugar; a difficult situation; a blockage
Example
She spread strawberry jam on her toast for breakfast every morning.
彼女は毎朝、トーストに苺ジャムを塗って朝食をとっていた。
C2 noun /ˈdʒæz.mɪn/

Jesmine

ジャスミン
Meaning
a climbing shrub with fragrant white or yellow flowers
Example
The jasmine flowers filled the garden with their sweet fragrance.
ジャスミンの花が庭を甘い香りで満たした。
C1 noun /ˈdʒuː.və.naɪl/

Juvenile

未成年者; 若者
Meaning
a young person below the age of adult criminal responsibility; relating to young people
Example
The juvenile court handles cases involving young offenders under eighteen.
少年裁判所は、18歳未満の若年犯罪者に関する事件を扱います。
B2 noun /dʒuː/

jew

ユダヤ人
Meaning
a person whose religion is Judaism or who is of Jewish descent
Example
He is a Jew by heritage and follows Jewish customs.
彼はユダヤ人で、ユダヤの習慣を守っています。
C1 adjective /ˈdʒuː.bɪ.lənt/

jubilant

歓喜
Meaning
feeling or expressing great happiness and joy
Example
The team was jubilant after winning the championship.
チームはチャンピオンシップを勝ち取った後、歓喜していました。
C2 adjective /ˈdʒɪg.ərd/

Jiggered

驚いた; びっくりした;
Meaning
surprised or astonished; confused or puzzled
Example
I'll be jiggered if I know what happened here.
ここで何が起こったのか知っていたら驚くでしょう。
C2 noun /ˈdʒuː.dɪˌkeɪ.tʃər/

judicature

司法制度
Meaning
the administration of justice or the system of courts
Example
The judicature ensures that laws are fairly applied.
司法制度は法律が公平に適用されることを保証します。
C1 verb /ˈdʒʌɡəl/

juggle

ジャグリングする
Meaning
To continuously toss and catch objects in the air; to manage many tasks at the same time.
Example
He tried to juggle work, studies, and family responsibilities.
彼は仕事、勉強、家族の責任を同時にこなそうとしました。
C2 noun /ˈdʒɪŋɡoʊɪst/

jingoist

ジンゴイスト
Meaning
a person who supports jingoism; an extreme nationalist with aggressive foreign policies
Example
He was labeled a jingoist for his extreme views.
彼は自分の極端な意見のためにジンゴイストとレッテルを貼られた。
C1 verb /ˈdʒʌmbəl/

jumble

混ぜる
Meaning
to mix things together in a confused or untidy way
Example
Don't jumble all the papers together in one pile.
すべての書類を一つの山に混ぜないでください。
B2 adjective /ˈdʒuːsi/

juicy

ジューシー
Meaning
Full of juice; succulent; also used to describe something exciting or scandalous.
Example
The steak was so juicy that it melted in my mouth.
ステーキはとてもジューシーで、口の中で溶けました。
C2 adjective /ˈdʒes.tɪŋ/

Jesting

冗談めいた
Meaning
joking or teasing in a playful manner
Example
He was only jesting when he said he would quit his job.
彼が仕事を辞めると言ったとき、彼はただ冗談を言っていただけだった。
C1 noun /ˈdʒʌɡərˌnɔːt/

juggernaut

止められない力
Meaning
A huge, powerful, and unstoppable force or institution.
Example
The new tech company has become a juggernaut in the industry.
新しいテクノロジー企業は業界で止められない力となった。
C1 noun /ˈdʒʌŋk.tʃər/

Juncture

重要な時点
Meaning
a particular point in events or time; a critical moment when important decisions must be made
Example
At this juncture, we need to make a crucial decision about our future.
この重要な時点で、私たちは未来について重要な決定を下さなければなりません。
B1 noun, verb /dʒeɪl/

jail

刑務所
Meaning
A place for the confinement of people accused or convicted of a crime; to imprison.
Example
The thief was sent to jail for stealing.
泥棒は盗みのために刑務所に送られました。
B2 noun /ˌdʒʌstɪfɪˈkeɪʃən/

justification

正当化
Meaning
a reason, explanation, or excuse that shows something is right or reasonable
Example
There is no justification for such rude behavior.
そのような失礼な行動には正当化の余地はない。
C2 adjective /ˈdʒɒkjələr/

jocular

冗談好きな
Meaning
fond of or characterized by joking; humorous
Example
His jocular nature made him popular among colleagues.
彼の冗談好きな性格は同僚の中で人気があった。
C2 noun /ˈdʒɪŋɡoʊˌɪzəm/

jingoism

過激な愛国主義
Meaning
extreme patriotism expressed in aggressive foreign policy
Example
The politician's speech was filled with jingoism.
その政治家の演説はジンゴイズムに満ちていました。
C1 noun /ˈdʒækˌfruːt/

Jackfruit

ジャックフルーツ
Meaning
a large tropical fruit with a spiky exterior and sweet flesh inside
Example
The jackfruit is the largest tree fruit in the world.
ジャックフルーツは世界で一番大きな木の果物です。
B1 noun /ˈdʒʌdʒ.mənt/

Judgement

判断; 決定
Meaning
the ability to make considered decisions or form sensible opinions; an official decision made by a judge or court
Example
The jury's judgement was based on careful consideration of all the facts.
陪審員の判断は、すべての事実を慎重に考慮した結果でした。
B2 noun /ˈdʒɝː.nə.lɪŋ/

journaling

ジャーナリング
Meaning
The practice of writing down your thoughts, feelings, and experiences regularly.
Example
Journaling helps in organizing thoughts and reducing stress.
ジャーナリングは思考を整理し、ストレスを減らすのに役立ちます。
B1 noun /dʒiːp/

jeep

ジープ
Meaning
a sturdy motor vehicle designed for rough terrain; a small military or civilian off-road vehicle
Example
The jeep climbed the rocky hill without difficulty.
ジープは簡単に岩だらけの丘を登った。
C1 verb /ˈdʒɒsl/

jostle

押す
Meaning
to push, elbow, or bump against someone roughly, typically in a crowd
Example
The fans jostled each other to get closer to the stage.
ファンたちはステージに近づくためにお互いに押し合っていました。
A2 noun /dʒɔɪ/

Joy

喜び
Meaning
a feeling of great pleasure and happiness; a person or thing that causes delight
Example
The children's laughter filled the house with joy during the holiday celebration.
子供たちの笑い声は、休日の祝賀の間に家を喜びで満たしました。
C1 adjective /ˈdʒɑː.rɪŋ/

jarring

耳障りな、衝撃的な
Meaning
Striking or shocking in a way that creates a strong contrast or clash.
Example
The sudden loud noise was jarring to everyone in the room.
突然の大きな音は部屋の中の皆に衝撃を与えました。
C2 noun /ˈdʒʊntə/

junta

軍事政権
Meaning
A military or political group that rules a country after taking power by force.
Example
The junta seized power after the coup.
クーデター後、軍事政権が権力を掌握しました。
A1 noun /dʒuˈlaɪ/

July

7月
Meaning
the seventh month of the year in the Gregorian calendar
Example
July is often the hottest month of the year.
7月は一年で最も暑い月の一つです。
C1 noun /ˈdʒuː.bɪ.liː/

Jubilee

記念日; 特別な記念式典
Meaning
a special anniversary celebration, especially the 25th, 50th, or 60th anniversary of an important event
Example
The school celebrated its golden jubilee with a grand ceremony.
学校はその金色の記念日を豪華な式典で祝いました。
B2 noun /dʒɜːrk/

Jerk

揺れ; 衝撃; バカ者
Meaning
a quick, sharp, sudden movement; an abrupt pull or twist; a foolish person
Example
The sudden jerk of the train caused passengers to lose their balance momentarily.
電車の突然の揺れで乗客は一瞬バランスを失いました。
A1 noun /dʒʌmp/

Jump

ジャンプ
Meaning
an act of jumping; a sudden movement upwards or forwards
Example
The athlete made a perfect jump over the high bar.
アスリートは高いバーを完璧にジャンプしました。
C2 verb /dʒaɪb/

jibe

皮肉を言う / 一致する
Meaning
to make an insulting remark; to be in agreement or harmony with
Example
His actions did not jibe with his words.
彼の行動は彼の言葉と一致していなかった。
B1 noun /ˈdʒuː.əl/

Jewel

宝石; 貴重な石; 装飾品
Meaning
a precious stone, typically a single crystal or piece of a hard lustrous or translucent mineral; a valuable ornament
Example
The crown was adorned with precious jewels from around the world.
王冠は世界中からの貴重な宝石で飾られていました。
C1 noun /dʒest/

Jest

冗談; いたずら
Meaning
a thing said or done for amusement; a joke
Example
His comment was made in jest, not to offend anyone.
彼のコメントは冗談で言われたもので、誰かを傷つけるためではなかった。
C1 noun /ˈdʒɪŋ.ɡəl/

Jingle

金属の物体がぶつかり合って発生する軽い音; 短くてキャッチーな歌
Meaning
a light ringing sound such as that made by metal objects being shaken together; a short catchy song
Example
The jingle of keys could be heard as she walked down the hallway.
廊下を歩いているとき、鍵の音が聞こえました。
C2 noun /dʒɔːnt/

jaunt

短い旅行
Meaning
A short journey or excursion, usually taken for pleasure.
Example
They went on a weekend jaunt to the countryside.
彼らは週末に田舎へ短い旅行に行きました。
A1 adjective /dʒʌst/

Just

公正な; 正義の; 適切な
Meaning
fair; righteous; morally right; appropriate
Example
The judge made a just decision in the case.
裁判官は事件に公正な判断を下しました。
A2 noun /ˈdʒuːəlri/

jewelry

宝石
Meaning
personal ornaments such as necklaces, rings, or bracelets that are typically made from precious metals and stones
Example
She wore gold jewelry at the wedding.
彼女は結婚式で金の宝石を身につけていました。
C2 noun /ˈdʒæk.dɔː/

Jack-daw

小さなカラス
Meaning
a small gray and black bird of the crow family, known for its intelligence
Example
The jackdaw collected shiny objects for its nest.
ジャックドーはその巣のために輝く物を集めました。
C2 noun /ˈdʒɒs.stɪk/

Joss-stick

お香
Meaning
a thin stick of incense that is burned for its pleasant smell, especially in religious ceremonies
Example
She lit a joss-stick in the temple during her prayers.
彼女は寺院で祈りの間にお香を灯しました。
C2 noun /dʒuːt/

jute

黄麻
Meaning
a long, soft, shiny plant fiber used to make rope, bags, sacks, and coarse cloth
Example
Jute is widely used to make eco-friendly bags and ropes.
黄麻は環境にやさしい素材です。
C2 noun /ˈdʒɒlɪti/

jollity

楽しさ
Meaning
lively and cheerful activity or celebration
Example
The wedding was full of jollity and laughter.
結婚式は楽しさと笑いに満ちていました。
B1 noun ˈdʒʌstɪs

justice

正義
Meaning
Just behavior or treatment; the quality of being fair and reasonable.
Example
Justice is sought by the oppressed characters in the story.
物語の中で、抑圧されたキャラクターは正義を求めています。
A2 adjective /ˌdʒæpəˈniːz/

japanese

日本語
Meaning
relating to Japan, its people, or their language
Example
She loves Japanese culture and traditions.
彼女は日本の文化と伝統が大好きです。
C2 noun dʒʊˈdɪʃəsnɪs

judiciousness

慎重さ、賢明さ
Meaning
Having, showing, or done with good judgment or sense.
Example
Her judiciousness in making decisions was appreciated.
意思決定における彼女の慎重さは評価されました。
B1 noun /ˈdʒʌŋ.ɡəl/

Jungle

密林; ジャングル;
Meaning
a dense forest in a tropical climate; a place of bewildering complexity or ruthless struggle
Example
The explorer got lost in the dense Amazon jungle for three days.
探検家は3日間アマゾンの密林で迷子になりました。
A1 noun /dʒɒb/

Job

仕事; 職業; ポスト
Meaning
a paid position of regular employment; a task or piece of work
Example
She found a new job at the technology company after graduation.
彼女は卒業後、技術会社で新しい仕事を見つけました。
C2 verb /dʒaʊst/

joust

Meaning
to engage in a medieval contest on horseback with lances; to compete or argue
Example
The knights prepared to joust in front of the cheering crowd.
C2 adjective /ˈdʒɒkənd/

jocund

陽気な
Meaning
cheerful and lighthearted
Example
They walked together in a jocund mood after the celebration.
彼らは祝賀会の後、陽気な気分で一緒に歩いていた。
A2 noun /dʒoʊk/

Joke

冗談; ジョーク; 笑いを引き起こす何か
Meaning
a thing that someone says to cause amusement or laughter; something not to be taken seriously
Example
Everyone laughed at his funny joke during the dinner party.
ディナーのパーティーで彼の面白いジョークにみんなが笑った。
C2 noun /dʒuːt liːf/

Jute leaf

ジュートの葉
Meaning
the edible leaves of the jute plant, commonly eaten as a leafy green vegetable
Example
Jute leaf is rich in vitamins and minerals and is often cooked with lentils in Bengali cuisine.
ジュートの葉はビタミンやミネラルが豊富で、ベンガル料理ではしばしばレンズ豆と一緒に調理されます。
C2 noun /ˈdʒʌŋk.tʃər/

jucture

重要な局面
Meaning
a particular point in time, especially one of great importance or crisis
Example
At this critical jucture, the company must decide whether to expand or downsize.
この重要な局面で、会社は拡大するか縮小するかを決定しなければなりません。
C1 adjective dʒuːˈdɪʃ.əs

judicious

賢明
Meaning
Having, showing, or done with good judgment or sense; wise and careful.
Example
A judicious decision can prevent future problems.
賢明な決定は未来の問題を防ぐことができます。
B2 noun /ˈdʒuː.pɪ.tər/

Jupiter

木星; ローマ神話の主神
Meaning
the largest planet in our solar system; the chief god of Roman mythology
Example
Jupiter is known for its massive size and distinctive red spot.
ジュピターはその巨大なサイズと特徴的な赤い斑点で知られています。
A2 noun /ˈdʒækɪt/

Jacket

ジャケット
Meaning
a piece of clothing worn on the upper body, typically having sleeves and fastening down the front
Example
He wore a leather jacket to protect himself from the cold wind.
彼は寒い風から自分を守るためにレザーのジャケットを着ていた。
B2 noun /ˈdʒʊəri/

jury

陪審団
Meaning
a group of people sworn to give a verdict in a legal case based on the evidence
Example
The jury found him guilty of the crime.
陪審団は彼を犯罪者として有罪と認定しました。
B2 noun /ˈdʒæn.ɪ.tər/

Janitor

清掃員、管理人
Meaning
a person employed to clean and maintain a building; a caretaker
Example
The school janitor worked late every evening to ensure the classrooms were spotless.
学校の清掃員は、教室が清潔に保たれるように毎晩遅くまで働いていました。
B2 noun /ˈdʒɜːrnəlɪzəm/

journalism

ジャーナリズム
Meaning
the activity or profession of collecting, writing, and publishing news and articles for newspapers, magazines, or broadcast media
Example
He studied journalism to become a news reporter.
彼はニュースリポーターになるためにジャーナリズムを学びました。
C2 adjective /dʒoʊˈkoʊs/

jocose

冗談めかした
Meaning
playful or humorous in speech or behavior
Example
The professor’s jocose remarks kept the class entertained.
教授の冗談めかした発言がクラスを楽しませました。
C1 noun /ˈdʒɔːn.dɪs/

jaundice

黄疸
Meaning
A medical condition in which the skin and eyes become yellow due to liver problems.
Example
The doctor diagnosed the baby with jaundice.
医師は赤ちゃんに黄疸と診断しました。
B1 noun /dʒʌdʒ/

Judge

裁判官; 審判
Meaning
a public official appointed to decide cases in a law court; a person who decides the results of a competition
Example
The judge carefully reviewed all the evidence before making a decision.
裁判官は決定を下す前にすべての証拠を慎重に検討しました。
C1 noun /ˌdʒʊə.rɪsˈdɪk.ʃən/

Jurisdiction

管轄
Meaning
the official power to make legal decisions and judgments; the extent of this power
Example
This case falls under the jurisdiction of the federal court.
このケースは連邦裁判所の管轄下にあります。
B2 noun /dʒɑːr/

Jar

ジャー; 瓶
Meaning
a wide-mouthed container made of glass or pottery; to have a harsh or unpleasant effect
Example
She stored homemade cookies in a large glass jar on the kitchen counter.
彼女はキッチンカウンターの大きなガラスジャーに自家製クッキーを保管していました。
C1 noun /ˈdʒɒt.ər/

Jotter

メモ帳
Meaning
a small notebook for writing quick notes or reminders
Example
The student carried a jotter to write down important points during lectures.
学生は講義中に重要なポイントを書き留めるためにメモ帳を持っていました。
B1 noun ˈdʒʌdʒ.mənt

judgment

判断、裁定、判断力
Meaning
The ability to make considered decisions or come to sensible conclusions.
Example
The judge's judgment was fair and just.
裁判官の判断は公平で公正でした。
B1 noun /ˈdʒʌm.pər/

Jumper

セーター;
Meaning
a knitted garment worn on the upper body; a person or animal that jumps
Example
She wore a warm woolen jumper during the cold winter evening.
彼女は寒い冬の夜に暖かいウールのジャンパーを着ていました。
B2 noun /ˈdʒɜːr.nəl/

Journal

ジャーナル
Meaning
a newspaper or magazine that deals with a particular subject; a daily record of events
Example
She kept a personal journal to record her thoughts and experiences.
彼女は自分の思考と経験を記録するために個人的なジャーナルを保っていた。
B2 adjective /ˈdʒɔɪfəl/

joyful

喜ばしい
Meaning
full of joy and happiness; causing joy or delight
Example
She felt joyful when she heard the good news.
彼女は良い知らせを聞いて喜ばしい気持ちになった。
B2 noun /ˈdʒoʊ.kər/

Joker

ジョーカー
Meaning
a playing card with a picture of a jester, used as a wild card; a person who is fond of joking
Example
He used the joker card to complete his winning hand in the poker game.
彼はポーカーの勝ち手を完成させるためにジョーカーを使った。
C2 adjective /dʒɪˈdʒuːn/

jejune

未熟 / 表面的 / 退屈
Meaning
Naive, simplistic, and superficial; also dull or uninteresting.
Example
The professor dismissed the essay as jejune and lacking depth.
教授はそのエッセイを未熟で深みがないとして却下した。
C2 noun /dʒeɪp/

jape

冗談, いたずら
Meaning
A practical joke or humorous remark.
Example
He enjoyed a harmless jape with his friends.
彼は友達と無害な冗談を楽しんだ。
A1 noun /dʒuːn/

june

六月
Meaning
the sixth month of the year in the Gregorian calendar
Example
Schools often close for summer vacation in June.
学校はたいてい六月に夏休みに入ります。
A1 noun /ˈdʒænjuˌɛri/

january

一月
Meaning
the first month of the year in the Gregorian calendar
Example
January is often the coldest month of the year.
一月は一年で最も寒い月です。
B2 adjective /ˈdʒɒli/

jolly

陽気な
Meaning
Full of good humor and cheerfulness.
Example
The children were in a jolly mood at the party.
子供たちはパーティーで陽気な気分でした。
C2 adjective /dʒʊˈrɪdɪkəl/

juridical

司法的
Meaning
Relating to judicial proceedings or the administration of law.
Example
The case raised important juridical questions.
その事件は重要な司法的問題を提起しました。
B2 verb /ˈdʒʌstɪfaɪ/

justify

正当化する
Meaning
to show or prove that something is right or reasonable
Example
He tried to justify his decision with logical reasons.
彼は論理的な理由で自分の決定を正当化しようとしました。
C2 adjective /ˈdʒɔːnti/

jaunty

陽気な
Meaning
Having a lively, cheerful, and self-confident manner or appearance.
Example
He walked into the room with a jaunty step.
彼は陽気な足取りで部屋に入った。
B1 noun /ˈdʒuː.ni.ər/

Junior

ジュニア; 初心者; 下位
Meaning
a person who is younger or lower in rank than someone else; relating to young people
Example
The junior employee was eager to learn from senior colleagues.
ジュニア社員はシニアの同僚から学びたがっていました。
C1 noun /ˌdʒʌkstəpəˈzɪʃən/

juxtaposition

並置
Meaning
The fact of two things being seen or placed close together with contrasting effect.
Example
The juxtaposition of light and dark colors created a dramatic effect.
明るい色と暗い色の並置が劇的な効果を生み出しました。
C2 noun /ˈdʒæɡ.ər.i/

Jaggary

ジャガリー
Meaning
unrefined sugar made from sugarcane or palm sap; a traditional sweetener
Example
My grandmother uses jaggery instead of white sugar in her recipes.
私の祖母はレシピで白い砂糖の代わりにジャガリーを使います。
B2 noun /ˈdʒuːələr/

jeweller

宝石商
Meaning
a person who makes, repairs, or sells jewelry
Example
The jeweller crafted a beautiful gold ring.
その宝石商は美しい金の指輪を作った。
C2 verb /ˈdʒɒɡəl/

joggle

軽く揺する
Meaning
to shake slightly; to move or cause to move with quick, small jerks
Example
He joggled the table and the vase nearly fell.
彼はテーブルを揺すって、花瓶が倒れそうになった。
C1 verb /dʒəʊlt/

jolt

衝撃
Meaning
to push or shake someone or something abruptly and roughly
Example
The sudden stop jolted all the passengers forward.
突然の停止で、すべての乗客が前方に押し出されました。
C2 noun /ˈdʒes.tər/

Jester

道化師; ピエロ
Meaning
a professional joker or fool at a medieval court; someone who jokes a lot
Example
The court jester entertained the king with witty remarks and amusing tricks.
宮廷の道化師は、鋭いコメントや面白いトリックで王様を楽しませた。
C1 adjective /ˈdʒeɪ.dɪd/

jaded

疲れた, 無関心
Meaning
Tired, bored, or lacking enthusiasm, typically after having had too much of something.
Example
After years of traveling, she felt jaded by the constant movement.
何年もの旅行の後、彼女は絶え間ない移動に疲れを感じた。
C2 noun /ˈdʒɪŋɡoʊ/

jingo

戦争支持の国家主義者
Meaning
a person who strongly supports warlike or aggressive foreign policy; an extreme nationalist
Example
The leader was criticized as a reckless jingo.
その指導者は無謀なジンゴとして批判された。
C2 verb /dʒɪr/

jeer

嘲笑う
Meaning
to laugh at someone or something in a cruel or mocking way
Example
The crowd began to jeer at the opposing team.
群衆は対戦チームを嘲笑し始めた。
C2 noun /ˈdʒʌŋkɪt/

junket

旅行または祝賀
Meaning
A trip or celebration, often funded by someone else, usually for pleasure or promotional purposes.
Example
The company organized a junket for journalists to promote their new resort.
会社はジャーナリストのために新しいリゾートを宣伝するための旅行を組織しました。
C1 verb /dʒæb/

jab

Meaning
To poke or thrust quickly, often with a finger or something pointed.
Example
He jabbed his finger at the map to show the location.
C2 noun /ˈdʒɛtsəm/

jetsam

船から投げ捨てられ、岸に打ち寄せられた不要な物や品物
Meaning
Unwanted material or goods thrown overboard from a ship and washed ashore.
Example
The beach was littered with jetsam after the storm.
嵐の後、ビーチにはジェットサムが散乱していました。
A2 noun /dʒæz/

jazz

幸せ
Meaning
a style of music characterized by improvisation, syncopation, and strong rhythm, originating in African American communities
Example
She loves listening to live jazz on weekends.
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。
B2 noun /dʒʌŋk/

Junk

ゴミ; 不要品
Meaning
old or discarded articles that are considered useless or of little value; things of poor quality
Example
He cleaned out the garage and threw away all the old junk.
彼はガレージを掃除して、すべての古いゴミを捨てました。
C1 noun /ˌdʒuː.bɪˈleɪ.ʃən/

jubilation

歓喜
Meaning
a feeling or expression of great happiness and triumph
Example
There was jubilation in the streets after the victory.
勝利後、街中は歓喜に包まれていました。
C1 noun /ˈdʒɛpərdi/

jeopardy

危険
Meaning
Danger of loss, harm, or failure.
Example
His careless driving put everyone in jeopardy.
彼の不注意な運転はみんなを危険にさらした。
B2 adjective /ˈdʒʌm.boʊ/

Jumbo

非常に大きい; 巨大
Meaning
exceptionally large; enormous; gigantic
Example
The jumbo jet was delayed at the airport.
ジャンボジェットは空港で遅れました。
B2 noun /ˈdʒʌŋk.ʃən/

Junction

ジャンクション
Meaning
a place where two or more roads or railway lines meet; a point where things join or connect
Example
Turn left at the junction to reach the shopping center.
ショッピングセンターに行くために、ジャンクションで左に曲がってください。
A2 verb /dʒɔɪn/

join

参加する
Meaning
to connect or combine; to become a member of something
Example
Would you like to join our team for the project?
プロジェクトのために私たちのチームに参加しますか？
C2 adjective /ˈdʒɔːndɪst/

jaundiced

偏見のある / 嫉妬深い / 黄疸による
Meaning
Affected by or displaying prejudice, envy, or bitterness; also refers to having a yellowish discoloration of the skin due to jaundice.
Example
She gave a jaundiced view of the project after her proposal was rejected.
彼女は提案が却下された後、プロジェクトに偏見を持った見方を示した。
A2 noun /dʒuːs/

Juice

ジュース（果物/野菜または肉から）
Meaning
the liquid obtained from or present in fruit or vegetables; the liquid that comes from meat when it is cooked
Example
The fresh apple juice was delicious and packed with vitamins.
新鮮なリンゴジュースは美味しく、ビタミンが豊富でした。
B2 verb /dʒɑːɡ/

jog

ジョギングする
Meaning
to run at a slow, steady pace for exercise
Example
She jogs every morning in the park.
彼女は毎朝公園でジョギングします。
B2 noun /dʒet/

Jet

ジェット機
Meaning
a rapid stream of liquid, gas, or flame; an aircraft powered by jet engines
Example
The jet took off smoothly and reached cruising altitude quickly.
ジェットは滑らかに離陸し、すぐに巡航高度に達しました。
A2 noun /ˈdʒɜːr.ni/

Journey

旅
Meaning
an act of travelling from one place to another; a long and often difficult process of personal development
Example
Their journey across the country took three weeks to complete.
彼らの国を横断する旅は三週間かかりました。
B1 adjective /ˈdʒel.əs/

Jealous

嫉妬; うらやましい; 誰かの注意や愛情を所有しようとすること
Meaning
feeling envious or resentful; possessive of someone's attention or affection
Example
She felt jealous when her friend got promoted.
彼女は友達が昇進したときに嫉妬を感じた。
C2 noun /dʒæm/

jamb

ドア枠
Meaning
The side post or surface of a doorway, window, or fireplace.
Example
The carpenter carefully measured the width of the door jamb.
大工はドア枠の幅を慎重に測定した。
C1 adjective /dʒuːˈdɪʃ.əl/

judicial

司法の
Meaning
relating to judges, courts, or the administration of justice
Example
The new law faced strong judicial review before implementation.
新しい法律は実施前に厳格な司法審査を受けました。
B1 noun /ˈdʒɜːrnəlɪst/

journalist

ジャーナリスト
Meaning
a person who writes news articles or reports for newspapers, magazines, or media
Example
The journalist covered the political event.
ジャーナリストは政治的なイベントをカバーしました。
C2 verb /ˈdʒæbər/

jabber

おしゃべりする
Meaning
To talk quickly and excitedly but with little sense.
Example
The children jabbered happily after the show.
子供たちはショーの後に楽しそうにおしゃべりしました。
C2 verb /ˈdʒɜːrnəlaɪz/

journalize

日記に記録する
Meaning
to record daily transactions or events in a journal, especially in accounting
Example
The accountant will journalize all financial transactions at the end of the day.
会計士は一日の終わりにすべての財務取引をジャーナライズします。
A2 noun /dʒiːnz/

jeans

幸せ
Meaning
pants made of denim fabric, often blue, worn as casual clothing
Example
He bought a new pair of blue jeans yesterday.
彼女は賞を受け取ったとき、自分の幸せを隠せなかった。
C2 noun /ˌdʒer.ɪˈmaɪ.æd/

Jeremiad

長い嘆き; 悲しみの苦情; 災難のリスト
Meaning
a long mournful complaint or lamentation; a list of woes; a prolonged expression of grief
Example
The newspaper editorial was a jeremiad about the decline of moral values in society.
新聞の社説は社会における道徳的価値の衰退についてのジェレミアッドだった。