quartet
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C1 noun /kwɔːrˈtɛt/

quartet

カルテット
Meaning
A group of four people playing music or singing together.
Example
The string quartet performed beautifully at the concert.
弦楽四重奏団はコンサートで素晴らしい演奏をしました。
C2 noun /kwɪˈɛsəns/

quiescence

静止
Meaning
A state of quietness, inactivity, or dormancy.
Example
The volcano has been in a state of quiescence for decades.
火山は数十年間静止状態にあります。
C2 noun /ˈkwɪkˌsɪlvər/

quicksilver

水銀
Meaning
Mercury; a liquid metal, or something that is quick and unpredictable.
Example
His mood was as changeable as quicksilver.
彼の気分は水銀のように変わりやすかった。
B2 adjective /ˈkwestʃənəbl/

Questionable

疑わしい
Meaning
doubtful; dubious; suspicious; open to doubt or suspicion
Example
His questionable business practices led to an investigation.
彼の疑わしいビジネス慣行は調査を引き起こしました。
C1 noun /ˈkwɔːrəm/

quorum

定足数
Meaning
The minimum number of members needed to conduct official business in a meeting.
Example
The board meeting was postponed because there was no quorum.
クォーラムがなかったため、理事会の会議は延期されました。
B2 noun /kwest/

Quest

探求; 探索
Meaning
a journey or search for something; an adventure to achieve a goal
Example
The knight embarked on a quest to find the legendary treasure.
騎士は伝説の宝物を見つけるための探求を始めました。
C2 verb, noun /ˈkweɪvər/

quaver

震える
Meaning
To shake or tremble in speaking, typically through nervousness or emotion.
Example
Her voice quavered as she spoke before the crowd.
彼女の声は群衆の前で話すとき震えていました。
C1 adjective /ˈkwɪzɪkəl/

quizzical

困惑した, 質問のような
Meaning
Expressing mild or amused puzzlement.
Example
She gave him a quizzical look when he made the strange comment.
彼が奇妙なコメントをしたとき、彼女は困惑した表情を彼に向けました。
B1 noun /ˈkwɒn.tə.ti/

Quantity

数量; 数字; 体積
Meaning
an amount or number of something; the measurable property of something
Example
The quantity of water in the bottle is sufficient for the trip.
ボトルの中の水の量は旅行に十分です。
B2 adjective /ˈkwɔːrtərli/

Quarterly

四半期ごと
Meaning
occurring every three months; relating to a quarter of a year
Example
The company publishes quarterly reports to shareholders.
会社は株主に四半期ごとの報告書を発行します。
C2 noun /ˈkwɒdrʊpɛd/

quadruped

Meaning
an animal that walks on four feet
Example
Most mammals are quadruped creatures adapted for running and stability.
A2 noun ˈkwɒl.ɪ.ti

quality

品質
Meaning
The standard of something as measured against other things of a similar kind; the degree of excellence of something.
Example
Quality assurance is vital in medical education.
品質保証は医学教育において重要です。
B2 adjective /ˈkwɑː.lɪ.teɪ.tɪv/

Qualitative

定性的
Meaning
relating to quality or character rather than quantity; descriptive rather than numerical
Example
The research focuses on qualitative analysis rather than numbers.
研究は数字よりも定性的分析に焦点を当てています。
A2 verb /kwɪt/

quit

やめる
Meaning
to stop doing something; to leave a job or position
Example
She decided to quit her job and start her own business.
彼女は仕事をやめて自分のビジネスを始めることにした。
C1 verb /kwɛl/

quell

鎮圧する
Meaning
To suppress or put an end to something, usually by force.
Example
The police were called to quell the violent protest.
警察は暴力的な抗議を鎮圧するために呼ばれました。
C1 verb /ˈkwɪkən/

quicken

加速する
Meaning
to make or become faster; to accelerate
Example
His pulse began to quicken as he approached the finish line.
彼の脈拍はゴールラインに近づくにつれて速くなり始めた。
C1 adjective /kweɪnt/

quaint

古風で魅力的な
Meaning
attractively unusual or old-fashioned
Example
They stayed in a quaint little cottage by the sea.
彼らは海の近くの趣のある小さな小屋に泊まりました。
B2 noun /kwəʊˈteɪʃən/

quotation

引用; 見積もり
Meaning
a group of words taken from a text or speech and repeated exactly; an estimated price given for goods or services
Example
The article opened with a famous quotation from Shakespeare.
その記事はシェイクスピアの有名な引用で始まった。
C1 noun /kwɪnˈtɛsəns/

quintessence

エッセンス
Meaning
The purest or most perfect example of something.
Example
She is the quintessence of elegance.
彼女は優雅さのエッセンスです。
B2 noun ˈkwɒlɪti sliːp

quality sleep

質の高い睡眠
Meaning
Deep and healthy sleep that is adequate and restorative, ensuring physical and mental well-being
Example
Quality sleep improves cognitive function and overall health.
質の高い睡眠は認知機能と全体的な健康を向上させます。
B1 noun /kjuː/

Queue

列; 行列
Meaning
a line of people or things waiting for something; a sequence
Example
We had to wait in a long queue to buy tickets for the movie.
映画のチケットを買うために長い行列で待たなければなりませんでした。
B2 noun /ˈkwɪə.ri/

Query

問い合わせ; 質問;
Meaning
a question or inquiry; a request for information
Example
I have a query about the new policy changes in the company.
私は会社の新しいポリシー変更についてのクエリがあります。
B2 noun /ˈkwɔːtərˌbæk/

quarterback

クォーターバック
Meaning
the player who directs a team’s offense in American football
Example
The quarterback threw a perfect pass.
クォーターバックは完璧なパスを投げました。
A1 adjective /kwɪk/

Quick

速い
Meaning
fast; rapid; swift; happening in a short time
Example
She gave a quick answer to the teacher's question.
彼女は教師の質問に迅速に答えました。
C2 noun /ˌkiː ˈviːv/

qui vive

警戒
Meaning
A state of alertness or vigilance.
Example
The guards were on the qui vive during the night.
警備員は夜間、警戒状態にありました。
C1 noun /kwoʊ/

quo

現状
Meaning
The existing state of affairs or situation, often used in the phrase 'status quo'.
Example
He wanted to maintain the status quo at work.
彼は職場で現状を維持したかった。
C1 adjective ˌkwɪn.tɪˈsen.ʃəl

quintessential

典型的または最も完璧な例
Meaning
representing the most perfect or typical example of a quality or class.
Example
The artist's work is the quintessential example of modernism.
アーティストの作品はモダニズムの典型的な例です。
B2 noun /ˌkwes.tʃəˈneər/

questionnaire

アンケート
Meaning
a set of written questions used to collect information or opinions
Example
Participants filled out a detailed questionnaire about their habits.
参加者は自分の習慣についての詳細なアンケートに記入しました。
C1 adjective /kwɪər/

Queer

奇妙な; 異常な; 特異な
Meaning
strange; unusual; peculiar; odd
Example
The old house had a queer atmosphere that made visitors uncomfortable.
古い家は奇妙な雰囲気があり、訪問者を不快にさせました。
B1 noun /ˌkwɒl.ɪ.fɪˈkeɪ.ʃən/

Qualification

資格; 能力
Meaning
official record showing that someone has finished a training course or has necessary skills; condition or requirement
Example
She has the right qualifications for this engineering job.
彼女はこのエンジニアの仕事に必要な資格を持っています。
C1 noun (plural) /kwɑːmz/

qualms

疑念
Meaning
feelings of doubt, worry, or uneasiness
Example
He had serious qualms about accepting the offer.
彼はそのオファーを受け入れることに深刻な疑念を抱いていた。
B2 noun/verb /ˈkwɒr.ən.tiːn/

quarantine

隔離
Meaning
A period of isolation to prevent the spread of disease.
Example
The travelers were placed in quarantine for two weeks.
旅行者は2週間の隔離にされました。
B2 adjective /ˈkwɑːn.tɪ.teɪ.tɪv/

Quantitative

定量的
Meaning
relating to quantity or amount; expressed in terms of numbers or measurements
Example
The study provides quantitative evidence of climate change effects.
この研究は、気候変動の影響に関する定量的な証拠を提供します。
B2 verb /kweɪk/

quake

震える
Meaning
to shake or tremble, often due to fear or a natural event like an earthquake
Example
The ground began to quake during the earthquake.
地震の間、地面が震え始めた。
C1 noun /ˈkwɪk.sænd/

Quick-sand

クイックサンド
Meaning
loose wet sand that yields easily to pressure and sucks in anything on its surface
Example
The explorer got trapped in quicksand while crossing the desert.
探検家は砂漠を横断中にクイックサンドに捕まりました。
C1 noun /ˈkwɒn.dər.i/

Quandary

ジレンマ; 困惑
Meaning
a difficult situation where you cannot decide what to do; dilemma
Example
She was in a quandary about which job offer to accept.
彼女はどの仕事のオファーを受け入れるかを決めかねていた。
C1 noun/verb /ˈkwɒr.i/

quarry

採石場 / 獲物
Meaning
A place where stone or minerals are extracted; also means prey when hunted.
Example
The workers quarried limestone from the hill.
作業員は丘から石灰岩を採掘しました。
C1 noun /ˈkwæɡˌmaɪər/

quagmire

沼地、困難な状況
Meaning
a soft, wet area of land that gives way underfoot; a complex or dangerous situation
Example
The hikers were trapped in a political quagmire.
ハイカーたちは政治的な沼地に閉じ込められた。
C1 noun /kwɑːm/

qualm

疑念
Meaning
a feeling of doubt, worry, or fear about something
Example
She had no qualm about speaking her mind.
彼女は自分の考えを言うことに疑念を持っていなかった。
C2 noun /kwiːn kreɪp ˈmɜːrtəl/

Queen crape myrtle

クイーンクレープマートル
Meaning
A flowering tree with colorful, crepe-like flowers, scientifically known as Lagerstroemia
Example
The Queen crape myrtle bloomed beautifully in the garden with its purple flowers.
クイーンクレープマートルは庭で紫色の花とともに美しく咲きました。
A2 adverb /kwaɪt/

Quite

かなり; やや; 完全に
Meaning
to a considerable extent; fairly; rather; completely
Example
The movie was quite interesting.
その映画はかなり面白かった。
B2 noun /ˈkwɒr.əl/

Quarrel

口論; 争い
Meaning
an angry argument or disagreement between people
Example
They had a quarrel about money and stopped talking to each other.
彼らはお金のことで口論し、互いに話すのをやめました。
B1 verb /kwoʊt/

quote

引用する
Meaning
to repeat someone else's words; to give a price or estimate
Example
The teacher asked students to quote the famous author in their essays.
教師は学生にその有名な作家をエッセイで引用するように頼みました。
B2 noun ˈkwəʊ.tə

quota

クォータ
Meaning
A limited or fixed number or amount of people or things, in particular.
Example
The quota reform was a key demand.
クォータ改革は重要な要求でした。
C1 verb, noun /kweɪl/

quail

恐怖を感じる; 小さくて短い尾の鳥
Meaning
verb: to feel or show fear; noun: a small, short-tailed bird
Example
She quailed at the sight of the approaching storm.
彼女は迫り来る嵐の光景に恐怖を感じた。
B1 adjective /ˈkwɑː.lɪ.faɪd/

Qualified

資格のある; 証明された
Meaning
having the necessary skills, knowledge, or experience for a particular job or activity; certified
Example
She is a qualified doctor with years of experience.
彼女は多くの経験を持つ資格のある医者です。
C2 noun kwɔːrk

quark

クォーク
Meaning
A fundamental subatomic particle that combines to form protons and neutrons.
Example
Quarks form protons and neutrons.
クォークは陽子と中性子を形成します。
B1 verb /ˈkwɒlɪfaɪ/

qualify

資格を得る
Meaning
to successfully complete a course or pass an exam; to become eligible
Example
She worked hard to qualify for the competition.
彼女は大会に出場する資格を得るために一生懸命働いた。
C2 verb /kwɒf/

quaff

一気に飲む
Meaning
to drink something heartily or in large gulps, especially an alcoholic drink
Example
He quaffed a mug of ale after the long day.
彼は長い一日の後、ビールを一気に飲んだ。
B2 noun /kwɪlt/

Quilt

キルト
Meaning
a warm bed covering made of padding enclosed between layers of fabric
Example
Grandmother made a beautiful quilt with colorful patches for my bed.
祖母は私のベッドのためにカラフルなパッチで美しいキルトを作りました。
C1 noun /kwɜːrk/

Quirk

癖; 特徴
Meaning
a peculiar behavioral habit; an unexpected turn or twist
Example
Her quirk of always wearing mismatched socks made her unique.
彼女のいつもミスマッチな靴下を履くクセが、彼女をユニークにした。
C1 verb /kwɑːʃ/

quash

取り消す
Meaning
To reject or void something legally or to put an end to something forcefully.
Example
The court quashed the decision due to lack of evidence.
裁判所は証拠不十分のため、その決定を取り消しました。
C2 noun /ˈkwɔːrtoʊ/

quarto

四つ折り本
Meaning
A book size resulting from folding each printed sheet into four leaves (eight pages).
Example
The library has rare Shakespeare quartos.
図書館にはシェイクスピアの珍しいクアート本があります。
C2 noun /ˈkwaɪəˌtuːd/

quietude

静けさ
Meaning
A state of stillness and tranquility.
Example
She enjoys the quietude of the countryside.
彼女は田舎の静けさを楽しんでいます。
C2 adjective /ˈkwɒdreɪt/

quadrate

正方形
Meaning
square or nearly square; having four sides or being suited or corresponding to something
Example
The tiles had a neat quadrate shape that made the floor look orderly.
タイルは整然とした正方形の形状をしており、床を整然と見せていました。
C1 verb/noun /ˈkwɪbəl/

quibble

Meaning
To argue or raise objections about a trivial matter; a petty objection.
Example
They quibbled over who should pay the bill.
C1 noun /kwæk/

Quack

偽医者
Meaning
a person who pretends to be a doctor but has no medical training; the sound a duck makes
Example
People should be careful not to trust medical advice from a quack.
人々はクアックからの医療アドバイスを信じないように注意すべきです。
B1 noun /ˈkwɒl.ɪ.ti taɪm/

quality time

質の高い時間
Meaning
Time spent giving someone your full attention in order to strengthen your relationship with them.
Example
Spending quality time with family enhances relationships.
家族と質の高い時間を過ごすことで、関係が強化されます。
C1 noun /kiː/

quay

桟橋
Meaning
A platform lying alongside or projecting into water for loading and unloading ships.
Example
The cargo was unloaded at the quay.
貨物は桟橋で荷降ろしされました。
A2 noun /kwiːn/

queen

女王
Meaning
a female ruler of a country or the wife of a king
Example
The queen addressed her people with grace.
女王は優雅に人々に話しかけた。
A1 noun /ˈkwes.tʃən/

Question

質問; 疑問文;
Meaning
a sentence asking for information or a response; an interrogative expression
Example
The teacher asked a difficult question during the exam.
先生は試験中に難しい質問をしました。
B1 noun /ˈkwɔː.tər/

Quarter

四分の一
Meaning
one of four equal parts of something; a period of three months
Example
The company reported strong profits in the first quarter of the year.
その会社は今年の最初の四半期に強い利益を報告しました。
A2 adverb /ˈkwaɪ.ət.li/

Quietly

静かに; 落ち着いて
Meaning
without making much noise; silently; in a calm manner
Example
She spoke quietly so she wouldn't wake the baby.
彼女は赤ちゃんを起こさないように静かに話した。
C2 adjective /kwɪkˈsɑː.t̬ɪk/

quixotic

非常に理想主義的で非現実的な、非実用的な
Meaning
Extremely idealistic, unrealistic, and impractical.
Example
His quixotic dreams often led to disappointment.
彼の非現実的な夢はしばしば失望につながった。
A1 adverb /ˈkwɪk.li/

Quickly

速く; 急速に
Meaning
at a fast speed; with little delay; rapidly
Example
He quickly finished his homework.
彼はすぐに宿題を終えました。
C1 adjective /ˈkwɑː.rəl.səm/

Quarrelsome

喧嘩好きな; 論争的な; 争い好きな
Meaning
given to arguing and fighting; argumentative and confrontational
Example
His quarrelsome nature makes it difficult to work with him.
彼の喧嘩好きな性格は、彼と一緒に働くのを難しくします。
C1 noun /kwɪnˈtɛt/

quintet

クインテット
Meaning
A group of five people or things, especially musicians.
Example
The jazz quintet performed beautifully.
ジャズのクインテットは見事に演奏しました。
C2 noun /ˈkwɪzlɪŋ/

quisling

裏切り者
Meaning
A traitor who collaborates with an enemy force occupying their country.
Example
During the war, he was branded a quisling for aiding the invaders.
戦争中、彼は侵略者を助けたため、クイズリングとしてレッテルを貼られました。
B2 noun /ˈkwɔː.tərz/

Quarters

宿舎; 兵舎; 軍の住宅
Meaning
living accommodation; lodgings; military housing
Example
The soldiers returned to their quarters after the training exercise.
兵士たちは訓練後、自分の宿舎に戻りました。
C1 adjective /ˈkwɑː.drʊ.pəl/

Quadruple

四倍
Meaning
four times as much or as many; consisting of four parts
Example
The company's profits have shown quadruple growth this year.
会社の利益は今年四倍の成長を見せました。
C2 adjective /kwəʊˈtɪdiən/

quotidian

日常的な、普通の
Meaning
Ordinary or everyday, especially when mundane.
Example
He focused on the quotidian details of family life.
彼は家族生活の日常的な詳細に集中した。
C1 verb /ˈkwɪvər/

quiver

震える
Meaning
To tremble or shake with slight but rapid motion.
Example
Her lips began to quiver as she tried not to cry.
彼女は泣かないように努力しながら唇が震え始めました。
C2 noun /kwaɪˈiːtəs/

Quietus

死または死を引き起こすもの; 最後の決着
Meaning
death or something that causes death; a final settlement
Example
The hero received his quietus from the villain's sword.
英雄は悪党の剣から自分のクワイエタスを受け取った。
C1 verb /kwentʃ/

quench

渇きを癒す
Meaning
to satisfy thirst by drinking; to extinguish fire
Example
He drank water to quench his thirst after the long run.
長いランニングの後、彼は喉の渇きを癒すために水を飲みました。
B2 adjective /ˈkwɜːrki/

quirky

風変わりな
Meaning
Unusual in an interesting, charming, or odd way.
Example
She has a quirky sense of fashion that makes her stand out.
彼女は個性的なファッションセンスを持っており、それが彼女を際立たせています。
C1 adjective /ˈkwiːzi/

queasy

気分が悪い
Meaning
Feeling sick to one's stomach; nauseated.
Example
She felt queasy after the long boat ride.
彼女は長いボートの旅の後、気分が悪くなった。
C1 adjective ˈkwɒn.tɪ.faɪ.ə.bəl

quantifiable

定量可能な
Meaning
Able to be expressed or measured as a quantity; capable of being counted or calculated.
Example
The impact of the project is quantifiable.
プロジェクトの影響は定量可能です。
C1 verb /ˈkwentʃɪŋ/

quenching

渇きを癒す / 火を消す
Meaning
The act of satisfying thirst or extinguishing something like fire.
Example
Drinking cold water was quenching her thirst.
冷たい水を飲むことが彼女の渇きを癒していました。
A2 adjective /ˈkwaɪ.ɪt/

Quiet

静かな; 穏やかな; 騒音を出さない
Meaning
silent; peaceful; calm; making little or no noise
Example
Please keep quiet during the movie.
映画中は静かにしてください。
C1 noun/verb /kwɪp/

quip

巧妙なコメント
Meaning
A witty remark; to make a witty or clever comment.
Example
She quipped about the weather during the meeting.
会議中に天気について冗談を言いました。
C2 adjective /kwaɪˈesnt/

Quiescent

静止した; 穏やかな; 活動していない;
Meaning
quiet; peaceful; inactive; dormant; at rest
Example
The volcano has been quiescent for over a century.
その火山は百年以上静止した状態です。
C2 adjective /ˈkwɛrʊləs/

querulous

不平を言う
Meaning
Complaining in a whining or irritable manner.
Example
The querulous customer kept finding fault with every detail.
その不平を言う顧客は、すべての細部に不満を見つけ続けました。