B1 noun /ˈkɪlər/

killer

殺人者

Meaning

A person or thing that kills.

Example

The police caught the killer last night.

警察は昨晩殺人者を捕まえた。

C1 noun /nɒb/

Knob

ドアや引き出しの丸い取っ手; 機械の小さな丸いスイッチ

Meaning

a rounded handle on a door or drawer; a small rounded switch on a machine

Example

He turned the brass knob to open the old wooden door.

彼は古い木の扉を開けるために真鍮のノブを回した。

A2 noun /kaɪt/

Kite

ハゲタカ

Meaning

a bird of prey with long wings and a forked tail; also a toy flown in the air

Example

The kite soared high above the fields looking for prey.

凧は田んぼの上で獲物を探しながら高く飛んでいた。

B2 noun /ˈkiː.pər/

Keeper

守衛; 飼育係;

Meaning

a person whose job it is to guard or take care of something or someone; a goalkeeper

Example

The zoo keeper fed the animals every morning at eight o'clock.

動物園のキーパーは毎朝8時に動物たちに餌を与えていました。

A2 noun /naɪf/

Knife

ナイフ

Meaning

a cutting instrument with a sharp blade

Example

She used a sharp knife to cut the vegetables for dinner.

彼女は夕食のために野菜を切るために鋭いナイフを使った。

C2 adjective /ˈnaɪt.li/

Knightly

騎士のような; 高貴で勇敢

Meaning

having the characteristics of a knight; chivalrous; noble and brave

Example

He showed knightly courage in defending the innocent.

彼は無実を守るために騎士のような勇気を示した。

B1 noun /ˈkiː.wi/

Kiwi

キウイ

Meaning

a small brown fruit with green flesh and black seeds; a flightless bird from New Zealand

Example

I love eating fresh kiwi for breakfast.

私は朝食に新鮮なキウイを食べるのが好きです。

C2 noun /ˈkɪzmɛt/

kismet

運命

Meaning

Destiny or fate.

Example

Meeting her on that day felt like pure kismet.

その日に彼女に会うことは純粋な運命のように感じました。

A2 noun /niː/

Knee

膝

Meaning

the joint connecting the thigh and the lower leg in humans

Example

He fell and scraped his knee on the pavement.

彼は転んで、歩道で膝を擦りむきました。

C1 noun /ˈkuːdɒs/

kudos

賛辞

Meaning

Praise and honor received for an achievement.

Example

She received kudos for her excellent performance.

彼女は素晴らしいパフォーマンスで賛辞を受けた。

B1 noun /kɪˈlɒmɪtər/ or /ˈkɪləˌmiːtər/

kilometer

キロメートル

Meaning

a unit of length equal to 1,000 meters

Example

The village is about five kilometers away from the town.

その村は町から約五キロメートル離れています。

C2 noun /kɪln/

kiln

窯

Meaning

a furnace or oven for burning, baking, or drying, especially one for firing pottery or bricks

Example

The potter placed the clay pots into the kiln for firing.

陶芸家は粘土の壺を窯で焼くために置きました。

B2 noun /ˈkɪdni/

Kidney

腎臓

Meaning

either of a pair of organs that filter waste products from the blood and produce urine

Example

Drinking plenty of water helps keep your kidneys healthy.

十分な水分を摂取することで、腎臓の健康を保つことができます。

B1 adverb; adjective /ˈkaɪndli/

kindly

親切に

Meaning

in a kind or gentle manner; showing kindness or goodwill

Example

She kindly helped the old man cross the street.

彼女は親切に老人が道を渡るのを手伝った。

C1 noun /ˈken.əl/

Kennel

犬小屋; 犬の繁殖や預かりを行う施設

Meaning

a small shelter for a dog; an establishment for the breeding or boarding of dogs

Example

The dog slept comfortably in his wooden kennel in the backyard.

犬は裏庭の木製のケネルで快適に寝ていました。

C2 noun /ˈnɪk.næk/

knickknack

幸福

Meaning

A small decorative object, especially in a house.

Example

The shelf was full of little knickknacks collected from their travels.

彼女は賞を受け取ったとき、喜びを隠すことができませんでした。

C1 noun /næk/

knack

才能

Meaning

a natural skill or ability; a special talent for doing something easily

Example

She has a knack for making people feel comfortable.

彼女には人々を快適に感じさせる才能がある。

A2 noun /ˈnɒl.ɪdʒ/

knowledge

知識

Meaning

Facts, information, and skills acquired through experience or education.

Example

Knowledge of the universe is expanding through research.

宇宙の知識は研究によって広がり続けています。

B2 noun /nɒt/

Knot

結び目

Meaning

a fastening made by tying a piece of string, rope, or something similar; a hard mass in wood

Example

The sailor tied a secure knot to anchor the boat safely.

船乗りはボートを安全に停泊させるためにしっかりとしたノットを結びました。

C2 noun /ˌkiː.təʊˈdʒen.ɪ.sɪs/

ketogenesis

ケトン生成過程

Meaning

The metabolic process by which the liver produces ketones from fatty acids, providing an alternative energy source during low carbohydrate availability.

Example

Ketogenesis occurs during fasting or low-carb diets.

ケトジェネシスは断食や低炭水化物ダイエット中に発生します。

B1 noun

Kindness

親切; 優しさ; 思いやり

C1 verb /niːd/

knead

こねる

Meaning

to work dough or clay into a uniform mixture by pressing, folding, and stretching

Example

She kneads the dough until it becomes smooth.

彼女は生地を滑らかになるまでこねます。

A1 noun /ˈkɪtʃən/

Kitchen

キッチン

Meaning

a room or area where food is prepared and cooked

Example

The kitchen was filled with the smell of fresh bread.

キッチンは新鮮なパンの匂いで満たされていた。

C1 noun /ˈnaɪt.hʊd/

knighthood

騎士の位

Meaning

The rank or dignity of a knight, or the ceremony of conferring knighthood.

Example

He was honored with knighthood for his contributions to science.

彼は科学への貢献で騎士の位を授与されました。

C2 noun /kəˈbɑːdi/

kabadi

廃品回収業者

Meaning

a person who collects and sells scrap or recyclable materials, especially in South Asia

Example

The kabadi came every week to collect old newspapers and bottles.

廃品回収業者は古い物を集めます。

B2 verb /nɪt/

knit

編む

Meaning

To make clothes or fabric by interlocking loops of yarn with needles.

Example

She loves to knit scarves for her friends during the winter.

彼女は冬に友達のためにスカーフを編むのが好きです。

A2 verb /kɪd/

kid

冗談を言う

Meaning

to joke or tease; to speak in a playful manner

Example

I'm just kidding with you.

私はただあなたと冗談を言っているだけです。

C1 noun /ˈkærət/

karat

カラット

Meaning

A unit for measuring the purity of gold, with 24 karats being pure gold.

Example

The ring was made of 18-karat gold.

その指輪は18カラットの金で作られていました。

B2 adjective /ˈnɑː.lɪ.dʒə.bəl/

Knowledgeable

知識豊富な; 教養のある; 有識な

Meaning

having extensive knowledge; well-informed; educated

Example

She is very knowledgeable about ancient history.

彼女は古代史に非常に詳しいです。

C2 noun /kɪθ/

kith

親しい友人

Meaning

Friends, acquaintances, and relations.

Example

He invited all his kith and kin to the wedding.

彼は結婚式にすべての親しい友人と親戚を招待しました。

C1 noun /ˈkɪŋ.fɪʃ.ər/

King-Fisher

カワセミ

Meaning

a small bird with bright blue and orange feathers that catches fish by diving into water

Example

The colorful kingfisher dove into the pond to catch a fish.

色とりどりのカワセミが池に飛び込んで魚を捕まえました。

C2 adjective /ˈnɒti/

knotty

複雑

Meaning

Complicated, difficult to solve or full of knots.

Example

He faced a knotty legal issue.

彼は複雑な法的問題に直面しました。

C2 noun /nɛl/

knell

鐘の音

Meaning

The sound of a bell, especially when rung solemnly for a death or funeral; a signal of the end or failure of something.

Example

The knell of the church bell echoed through the valley at dusk.

教会の鐘の音が夕暮れ時に谷を響き渡った。

B1 noun /kɪk/

Kick

キック; 足で蹴る

Meaning

a blow or forceful thrust with the foot; a sudden strong feeling of excitement

Example

The soccer player scored a goal with a powerful kick from outside the penalty area.

サッカー選手はペナルティエリアの外から強力なキックでゴールを決めました。

C2 noun

Kinsfolk

親戚, 家族

B1 noun; gerund /ˈnɪtɪŋ/

knitting

編み物

Meaning

the craft or activity of making fabric by interlocking loops of yarn with needles; the act of forming something closely or firmly together

Example

She spends her evenings knitting scarves for her family.

彼女は家族のために夜に編み物をします。

B2 verb /ˈkɪdnæp/

kidnap

誘拐する

Meaning

to take someone away illegally by force

Example

The criminals kidnapped the wealthy businessman.

犯罪者は裕福なビジネスマンを誘拐しました。

C1 noun /kəˈlaɪdəˌskoʊp/

kaleidoscope

万華鏡

Meaning

A toy or instrument with mirrors and colored pieces that create changing patterns when rotated; also used metaphorically for a constantly changing sequence of patterns or elements.

Example

The city lights turned into a kaleidoscope of colors as the festival began.

祭りが始まると、街の明かりは色とりどりの万華鏡に変わった。

A2 adjective /kəˈriːən/

korean

韓国の

Meaning

relating to Korea, its people, language, or culture

Example

We went to a Korean restaurant for dinner.

私たちは夕食のために韓国のレストランに行きました。

C1 noun /ˈkɪləˌwɒt/

kilowatt

キロワット

Meaning

a unit of power equal to 1,000 watts

Example

The generator produces ten kilowatts of electricity.

発電機は10キロワットの電力を生産します。

A2 verb /kɪl/

kill

殺す

Meaning

to cause the death of; to end life

Example

The hunter killed the deer.

ハンターは鹿を殺した。

A2 noun /ˈketʃ.ʌp/

Ketch-up

ケチャップソース

Meaning

a thick sauce made chiefly from tomatoes, vinegar, and spices

Example

She squeezed some ketchup on her french fries before eating them.

彼女はフレンチフライにケチャップをかけてから食べました。

B1 noun /naɪt/

Knight

騎士; 中世の戦士

Meaning

a man given a rank of honor by a British king or queen; a medieval warrior on horseback

Example

The brave knight rescued the princess from the dragon's castle.

勇敢な騎士はドラゴンの城から姫を助けました。

C2 verb /ˌkaʊˈtaʊ/

kowtow

過度に従順である

Meaning

To act in an excessively subservient or obedient manner.

Example

He refused to kowtow to the unreasonable demands.

彼は不合理な要求に従うことを拒否した。

C2 noun /ˌklɛptəˈmeɪniæk/

kleptomaniac

盗みを抑えきれない衝動を持つ人

Meaning

A person with an irresistible urge to steal, typically without need or profit.

Example

The kleptomaniac was caught shoplifting again.

そのクレプトマニアは再び店で万引きして捕まった。

B2 adjective /ˌkaɪnd ˈhɑːrtɪd/

kind-hearted

優しい

Meaning

Having a kind and generous nature; showing compassion and care for others.

Example

She is known as a kind-hearted teacher who always helps her students.

彼女は常に生徒を助ける優しい教師として知られています。

A2 noun /ˌkæŋ.ɡəˈruː/

Kangaroo

カンガルー

Meaning

a large marsupial from Australia that moves by hopping on its strong hind legs

Example

The kangaroo jumped high with its joey in its pouch.

カンガルーは、袋の中に子供を入れて高く跳ねました。

C1 verb /ˈkɪndəl/

kindle

灯す

Meaning

to light a fire; to arouse or inspire

Example

She kindled the campfire with dry wood.

彼女は乾いた木でキャンプファイヤーを灯しました。

B2 verb /niːl/

kneel

ひざまずく

Meaning

to go down on one's knees; to rest on the knees

Example

The knight knelt before the king.

騎士は王の前でひざまずいた。

C2 noun /neɪv/

Knave

不正直な人；トランプのジャック

Meaning

a dishonest person, especially a man; a playing card with a picture of a male servant

Example

The knave tried to cheat the old woman out of her savings.

その悪党は年老いた女性をだまして、貯金を奪おうとした。

B2 adjective /ˈnoʊ.ɪŋ/

Knowing

知識; 洞察力; 賢い;

Meaning

showing awareness or understanding; perceptive; shrewd

Example

She gave him a knowing smile when he mentioned the secret.

彼は秘密に言及したとき、彼女は知っているような笑顔を見せた。

C2 noun /noʊl koʊl/

Knol khol

カリフラワー

Meaning

round bulbous vegetable from cabbage family with pale green color and mild taste

Example

Knol khol can be eaten raw in salads or cooked in curries.

カリフラワーはサラダで生で食べることも、カレーにしても美味しいです。

C1 noun /ˈkiːpˌseɪk/

keepsake

記念品

Meaning

An object kept as a reminder of a person, place, or event.

Example

She gave me a small locket as a keepsake of our friendship.

彼女は私たちの友情の記念として小さなロケットをくれました。

B2 noun

Kitchen garden

キッチンガーデン; キッチンの近くの庭

A2 noun /ˈkɪt.ən/

Kitten

子猫

Meaning

a young cat

Example

The little kitten loves to play with yarn balls.

小さな子猫は毛糸の玉で遊ぶのが大好きです。

C1 adjective /ˈnæk.ərd/

Knackered

非常に疲れた; くたびれた

Meaning

extremely tired; exhausted

Example

I'm absolutely knackered after working all day.

私は一日中働いた後、完全に疲れ果てました。

C1 noun

Kin

家族; 親戚;

B2 noun /ˈker.ə.siːn/

Kerosene

ケロシン

Meaning

a combustible hydrocarbon liquid widely used as a fuel in lamps and heating systems

Example

The old lamp burned kerosene to provide light during power outages.

古いランプは停電中に光を提供するためにケロシンを燃やしていました。

C2 adjective /ˈkɪŋ.ki/

Kinky

変わった性的習慣; カールした髪

Meaning

having or involving unconventional sexual practices; having tight curls or bends

Example

His kinky hair made him look unique.

彼のくるくるした髪は彼をユニークに見せました。

C2 noun /ˈkɪləˌliːtər/

kiloliter

キロリットル

Meaning

a unit of capacity equal to 1,000 liters

Example

The tank can hold up to three kiloliters of water.

タンクは最大で3キロリットルの水を保持できます。

B1 adjective /kiːn/

Keen

鋭い; 激しい; 熱心

Meaning

sharp; acute; intense; eager

Example

She has a keen interest in science.

彼女は科学に強い関心を持っています。

C2 noun /ˈkɜːrtʃɪf/

kerchief

バンダナ

Meaning

a piece of cloth worn around the head or neck

Example

She wore a red kerchief on her head.

彼女は頭に赤いバンダナを巻いていました。

C1 adjective /kɪˈnɛtɪk/

kinetic

運動エネルギー

Meaning

Relating to or resulting from motion.

Example

Kinetic energy increases as the object moves faster.

物体が速く動くとき、運動エネルギーは増加します。

C2 noun /ˈkɪŋɡlɪŋ/

kingling

小さな王

Meaning

A minor or petty king; a ruler of small importance.

Example

The kingling demanded respect from his people despite his small realm.

その小さな王は、小さな王国にもかかわらず、彼の人々に尊敬を要求しました。

C2 noun /ˈneɪvəri/

knavery

詐欺

Meaning

dishonest or deceitful behavior; trickery

Example

The politician’s knavery was exposed by the media.

政治家の詐欺はメディアによって暴露された。

C2 noun /kɛn/

ken

理解の範囲

Meaning

one's range of knowledge or understanding

Example

Quantum physics is beyond my ken.

量子物理学は私の理解を超えています。

C1 noun /kɪˈməʊnoʊ/

kimono

着物

Meaning

a traditional Japanese robe with wide sleeves, tied with a sash

Example

She wore a beautiful silk kimono at the ceremony.

彼女は儀式で美しい絹の着物を着ていた。

A2 noun /ˈkɪndərˌɡɑːrtn/

kindergarten

幼稚園

Meaning

a school or class for young children, typically between the ages of four and six

Example

She enrolled her child in kindergarten to prepare for elementary school.

彼女は子供を小学校に備えて幼稚園に入学させました。

B1 noun /ˈkɪləɡræm/

kilogram

キログラム

Meaning

the base unit of mass in the metric system equal to 1,000 grams

Example

The bag of rice weighs five kilograms.

その米袋は五キログラムあります。

A2 verb /kɪs/

Kiss

キス

Meaning

to touch with the lips as a sign of affection

Example

The mother kissed her baby goodnight.

母親は赤ちゃんにおやすみなさいのキスをしました。

A1 noun /kiːp/

Keep

生活費; 城の最強部分

Meaning

food and other things necessary for living; the strongest part of a castle

Example

He worked hard to earn his keep and support his family.

彼は家族を支えるために一生懸命働いた。

B2 noun /ˈkiːɒsk/

kiosk

キオスク

Meaning

A small, open-fronted hut or cubicle from which newspapers, refreshments, tickets, etc., are sold.

Example

She bought a bottle of water from the kiosk near the station.

彼女は駅の近くのキオスクで水のボトルを買いました。

C1 noun ˈkiː.stəʊn ˈspiː.ʃiːz

keystone species

キーストーン種

Meaning

A species on which other species in an ecosystem largely depend, such that if it were removed the ecosystem would change drastically.

Example

Wolves are a keystone species that regulate prey populations.

オオカミは獲物の個体数を調整するキーストーン種です。

C2 noun /kəˈdʌm.bə/

Kadamba

カダンバの木

Meaning

A tropical tree with round, fragrant orange flowers, sacred in Hindu culture and associated with Lord Krishna

Example

The kadamba tree is mentioned frequently in ancient Indian poetry.

カダンバの木は古代インドの詩で頻繁に言及される。

B2 noun /ˈkɪlɪŋ/

killing

殺人

Meaning

the act of causing death, especially deliberately

Example

The movie depicts the brutal killing of the villagers.

映画は村人たちの残忍な殺人を描いています。

A2 adjective /noʊn/

known

知られている

Meaning

recognized or familiar; something that is identified or acknowledged

Example

He is a well-known actor in the country.

彼は国でよく知られた俳優です。

A1 adjective /kaɪnd/

Kind

親切な; 思いやりのある

Meaning

gentle; caring; compassionate; showing sympathy

Example

He is a kind person who always helps others.

彼はいつも他の人を助ける親切な人です。

A2 noun /kɪŋ/

King

王

Meaning

the male ruler of an independent state, especially one who inherits the position by right of birth

Example

The king ruled the country with wisdom and fairness.

王は知恵と公正で国を治めました。

A1 verb /noʊ/

know

知る

Meaning

to have information about something; to be familiar with

Example

I know the answer to this question.

私はこの質問の答えを知っています。

C1 noun, adjective /ˈkɪndrəd/

kindred

幸せ

Meaning

A person's relatives or family; similar in nature or character.

Example

They discovered kindred spirits in each other.

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。

A2 noun /nɒk/

Knock

ノック; 叩く

Meaning

a sudden sharp blow; the sound of striking something

Example

There was a loud knock at the door late at night.

深夜にドアで大きなノックの音がしました。

C2 noun /ˈkedʒ.ə.riː/

Kedgeree

ケジリー

Meaning

a European dish of cooked rice, fish, and hard-boiled eggs, originally from India

Example

The breakfast menu featured traditional kedgeree with smoked haddock and eggs.

朝食のメニューには、スモークハドックと卵が入った伝統的なケジリーがありました。

C2 noun /ˈkɪldʒɔɪ/

killjoy

空気を壊す人

Meaning

a person who spoils the fun or enjoyment of others

Example

Don’t be a killjoy at the party.

パーティーで空気を壊す人にならないで。

A2 noun /ˈkiːbɔːrd/

keyboard

キーボード

Meaning

a set of keys used to operate a computer, typewriter, or similar device for inputting text and commands

Example

She typed the report quickly on her keyboard.

彼女はキーボードで素早くレポートを入力した。

A2 noun /ˈket.əl/

Kettle

やかん

Meaning

a container used for boiling water, typically with a lid, spout, and handle

Example

The electric kettle whistled when the water reached boiling point.

電気ケトルは水が沸騰点に達したときに笛のような音を立てました。

B1 noun /ˈkɪŋdəm/

Kingdom

王国

Meaning

a country or territory ruled by a king or queen

Example

The kingdom was known for its rich culture and traditions.

その王国は豊かな文化と伝統で知られていた。

B1 noun /kɪt/

kit

道具セット

Meaning

a set of tools, equipment, or materials used for a particular purpose

Example

He bought a first aid kit for emergencies.

彼は緊急事態に備えて救急キットを購入しました。

A1 noun /kiː/

Key

鍵

Meaning

a small piece of shaped metal used to operate a lock; something that provides a means of access

Example

She lost her house key and couldn't get inside until the locksmith arrived.

彼女は家の鍵を失くして、鍵屋が来るまで中に入れませんでした。

C2 noun /kəˈrɒn.də/

Karonda

カロンダ

Meaning

a small dark purple berry-like fruit that is sour and used in pickles

Example

Karonda is often used to make pickles and preserves.

カロンダは、ピクルスや保存食を作るのによく使われます。

C1 noun /ˈkɜːrnəl/

kernel

何かの中心; ナッツや種子の食べられる部分

Meaning

the central, most important part of something; the edible part of a nut or seed

Example

The kernel of the argument was about fairness.

議論の核心は公平についてでした。

C1 adverb /ˈnoʊɪŋli/

knowingly

故意に

Meaning

in a way that shows you are aware of something; intentionally

Example

She knowingly kept the secret from her friends.

彼女は故意に友達に秘密を隠しました。

C2 noun /noʊl/

Knoll

小さな丘; マウンド

Meaning

a small rounded hill or mound

Example

The old oak tree stood majestically on top of the grassy knoll.

古いオークの木は、草に覆われた小さな丘の頂上に堂々と立っていました。

C2 noun /ˈkɪŋʃɪp/

kingship

王権

Meaning

The position, dignity, or authority of a king.

Example

The king’s advisors often reminded him of the responsibilities of kingship.

王の顧問たちはしばしば彼に王権の責任を思い出させました。