fulminate
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C2 verb /ˈfʊl.mɪ.neɪt/

fulminate

強く抗議する
Meaning
To express strong protest or criticism loudly and forcefully; to explode violently.
Example
The politician began to fulminate against corruption.
政治家は腐敗に強く抗議し始めた。
B2 noun /ˈfeɪ.lɪŋ/

Failing

失敗; 欠点; 弱点
Meaning
a weakness, especially in a person's character; a fault
Example
His only failing is that he talks too much during meetings.
彼の唯一の失敗は、会議中に話しすぎることです。
A2 verb /fɪl/

fill

満たす
Meaning
to make or become full; to put something into a container until it is full
Example
Please fill the glass with water.
グラスに水を注いでください。
C1 verb /ˈfrɒlɪk/

frolic

楽しげに遊ぶ
Meaning
to play and move about cheerfully, energetically, or playfully
Example
The children frolicked in the garden all afternoon.
子供たちは午後中庭で楽しげに遊んでいました。
B2 adverb /ˈfɔːrmərli/

Formerly

以前は; 以前
Meaning
in the past; previously; at an earlier time
Example
The building was formerly a school but is now a community center.
その建物は以前は学校でしたが、今はコミュニティセンターです。
B1 noun /ˈfɔːr.mæt/

Format

フォーマット
Meaning
the way in which something is arranged or set out; the shape, size, and presentation of a book or document
Example
Please submit your report in PDF format by the end of the week.
週末までにPDFフォーマットで報告書を提出してください。
C1 noun /ˈfjuː.tʃə.rɪst/

futurist

未来学者
Meaning
A person who studies or predicts the future, especially trends in science, technology, or society.
Example
The futurist predicted major changes in transportation within the next decade.
未来学者は次の10年間で交通に大きな変化があると予測しました。
B1 adverb /ˈfriːkwəntli/

Frequently

頻繁に; 定期的に; 多くの回数
Meaning
often; regularly; many times
Example
She frequently visits her grandmother on weekends.
彼女は週末に頻繁に祖母を訪れます。
C2 noun /ˈfɔːrˌpiːk/

forepeak

船首の部屋
Meaning
The compartment in the forward part of a ship, often used for storage.
Example
The sailors stored extra ropes in the forepeak.
船員たちは余分なロープを船首の部屋に収納しました。
A2 adjective /frɛʃ/

fresh

新鮮
Meaning
new, recently made, or clean and pure
Example
The bread is still fresh from the oven.
パンはオーブンから出たばかりです。
A1 adjective /ˈfʌn.i/

Funny

面白い; 変な; おかしい;
Meaning
humorous; strange; amusing;
Example
He told a funny joke that made everyone laugh.
彼はみんなを笑わせた面白いジョークを言いました。
C1 adjective /ˌfɑːrˈfetʃt/

farfetched

ありそうもない、またはあり得ない
Meaning
unlikely to happen or be true; improbable
Example
His explanation for being late sounded farfetched.
彼の遅刻の説明は信じがたいものだった。
C1 verb /ˈflʌtər/

flutter

羽ばたく / 震える
Meaning
to move or flap quickly and lightly; to beat or wave with small rapid motions
Example
The butterfly began to flutter its wings in the sunlight.
蝶が日光の中で羽ばたき始めた。
B2 noun/adjective /ˈfluːɪd/

fluid

流体
Meaning
a substance that can flow easily, such as liquid or gas; smooth and adaptable
Example
The artist's fluid movements impressed the audience.
アーティストの流れるような動きは観客を感動させました。
B2 noun /ˈfluː.ən.si/

fluency

流暢さ
Meaning
The ability to speak or write a language smoothly and effortlessly.
Example
She speaks English with remarkable fluency.
彼女は素晴らしい流暢さで英語を話します。
C1 noun /ˈfɛləni/

felony

重罪
Meaning
a serious crime, usually punishable by imprisonment for more than one year
Example
He was convicted of a felony and sentenced to ten years in prison.
彼は重罪で有罪判決を受け、10年間の懲役刑を言い渡されました。
B1 adverb /ˈfɔːtʃənətli/

fortunately

幸いにも
Meaning
by good luck; luckily
Example
Fortunately, no one was injured in the accident.
幸いにも、事故で誰も怪我をしませんでした。
B2 noun ˌfʌŋk.ʃəˈnæl.ə.ti

functionality

機能性
Meaning
The quality of being functional; the ability to work or operate as intended.
Example
The new refrigerator has improved functionality.
新しい冷蔵庫は機能性が向上しました。
B1 noun /ˈfeɪ.ljər/

Failure

失敗
Meaning
lack of success; an unsuccessful person, enterprise, or thing
Example
The project's failure was due to poor planning and communication.
プロジェクトの失敗は、計画とコミュニケーションの不備によるものでした。
B2 adjective /ˈfruːt.fəl/

Fruitful

実り多い; 有益な; 成功した;
Meaning
productive; beneficial; successful;
Example
Our discussion was very fruitful and led to many new ideas.
私たちの議論は非常に実り多く、新しいアイデアをたくさん生み出しました。
C1 adjective /ˈfiːlaɪn/

feline

猫に関する
Meaning
relating to or characteristic of cats
Example
Her movements were graceful and almost feline in their elegance.
彼女の動きは優雅で、ほとんど猫のようだった。
B2 noun /fɔːrˈmeɪʃən/

formation

形成
Meaning
the action of forming or process of being formed
Example
The formation of the new company took several months.
新しい会社の形成には数ヶ月かかりました。
C1 noun ˈflɔː.rə ænd ˈfɔː.nə

flora and fauna

フローラとファウナ
Meaning
The plants and animals of a particular region, habitat, or geological period.
Example
The Galápagos Islands have unique flora and fauna.
ガラパゴス諸島には独特のフローラとファウナがあります。
B2 verb fəˈsɪl.ɪ.teɪt

facilitate

容易にする
Meaning
Make an action or process easier or more achievable; to help bring about.
Example
Good infrastructure facilitates economic growth.
良いインフラは経済成長を容易にする。
B2 noun /ˌfæs.ɪˈneɪ.ʃən/

Fascination

魅力; 魅了; 魅力的な興味
Meaning
the power to fascinate someone; the state of being intensely interested
Example
Her fascination with ancient history led her to become an archaeologist.
彼女の古代史への魅力は、彼女を考古学者にさせました。
C1 noun /ˈfoʊk.lɔːr/

folk-lore

民間伝承
Meaning
The traditional beliefs, customs, stories, songs, and practices of a community, passed down through generations.
Example
Bangladeshi folk-lore is rich with myths and legends.
日本の民間伝承は神話や伝説で豊かです。
B1 noun ˈfæmɪli triː

Family Tree

家系図
Meaning
A diagram showing the relationships between people in several generations of a family.
Example
Creating a family tree helps understand family history.
家系図を作成することは、家族の歴史を理解するのに役立ちます。
C2 noun /fluːk/

fluke

偶然の幸運
Meaning
A stroke of luck; an unexpected piece of good fortune.
Example
Winning the lottery was a complete fluke.
宝くじに当たるのは完全に偶然の幸運だ。
C2 noun /foʊl fʊt/

Foal-foot

馬のひづめの花
Meaning
a yellow flowering plant with leaves shaped like a horse's hoof, also known as coltsfoot
Example
The foal-foot plant grows wild in many meadows and is often the first flower to bloom in spring.
馬のひづめの花の植物は多くの草地で野生で成長し、春に最初に咲く花の一つです。
A1 noun /faɪv/

five

五
Meaning
The number 5; one more than four and one less than six.
Example
She bought five apples from the market.
彼女は市場で五つのリンゴを買いました。
A2 noun /ˈfɔːrənər/ or /ˈfɑːrənər/

foreigner

外国人
Meaning
A person from another country.
Example
The city welcomes every foreigner with kindness.
その都市はすべての外国人を親切に迎えます。
B1 verb /ˈfraɪtən/

frighten

怖がらせる
Meaning
to cause fear or alarm in someone
Example
The loud noise frightened the child.
大きな音が子供を怖がらせた。
C2 verb /ˈfɛstər/

fester

悪化する、激化する
Meaning
to become worse or more intense, often through neglect or infection
Example
If grievances are ignored, they may fester into resentment.
不満を無視すると、それは恨みに変わることがあります。
C2 adjective /ˈfækʃəs/

factious

分裂的な
Meaning
causing disagreement or division within a group; inclined to form factions
Example
The debate became factious, splitting the committee into rival camps.
議論は分裂的になり、委員会は対立する陣営に分かれました。
C1 noun /ˈfɔːrˌrʌnər/

forerunner

先駆者
Meaning
A person or thing that comes before another; a predecessor or harbinger.
Example
The Wright brothers were the forerunners of modern aviation.
ライト兄弟は現代の航空の先駆者でした。
C2 noun /ˈfriːˌθɪŋkər/

freethinker

自由思想家
Meaning
A person who forms opinions based on reason and independent thought rather than tradition or authority.
Example
Voltaire was considered a great freethinker of his time.
ヴォルテールは彼の時代の偉大な自由思想家と見なされていました。
C2 adjective /ˈflaɪti/

flighty

不安定
Meaning
unstable, impulsive, or easily distracted; lacking seriousness or stability
Example
She’s too flighty to stick with one job for long.
彼女は一つの仕事に長く留まるには不安定すぎる。
A1 adjective /fjuː/

few

少数
Meaning
A small number of; not many.
Example
Only a few students attended the class.
ほんの少しの学生がクラスに出席しました。
A1 verb /fərˈɡet/

forget

忘れる
Meaning
to be unable to remember something; to fail to bring something to mind
Example
Don't forget to lock the door when you leave.
出かけるときはドアを閉め忘れないでください。
C1 adjective /ˈfiːbl/

feeble

弱い, 無力
Meaning
lacking physical strength or vigor; weak
Example
After the illness, she felt too feeble to stand.
病気の後、彼女は立ち上がるにはあまりにも弱かった。
C2 noun /ˈfɜːrnəri/

fernery

シダ植物の栽培所、シダを育てる場所
Meaning
a place or greenhouse where ferns are cultivated
Example
The garden's fernery was full of exotic plants.
庭のファーネリーは珍しい植物でいっぱいだった。
A1 adjective /frɛntʃ/

french

フランスの
Meaning
Relating to France, its people, or their language.
Example
We enjoyed delicious French cuisine on our trip to Paris.
私たちはパリ旅行で美味しいフランス料理を楽しみました。
C1 noun /ˈfænsiər/

fancier

愛好家
Meaning
a person who has a special interest in a particular thing or activity, especially animals or hobbies
Example
He is a fancier of rare birds.
彼は珍しい鳥の愛好家です。
C2 noun /ˈfeɪ.tə.lɪ.zəm/

fatalism

運命論
Meaning
the belief that all events are predetermined and inevitable
Example
He embraced fatalism, believing that nothing he did could change his destiny.
彼は運命論を受け入れ、自分の行動が運命を変えることはできないと信じていました。
C1 adjective /ˈfjuː.dəl/

feudal

封建的
Meaning
relating to the system of feudalism, a medieval social system based on land ownership and obligations
Example
The castle is a remnant of the feudal era.
城は封建時代の遺物です。
C1 adjective /fəˈnætɪk/

Fanatic

熱狂的な
Meaning
extremely passionate about something; showing excessive enthusiasm or devotion
Example
He is a fanatic supporter of his football team.
彼はサッカーチームの熱狂的なサポーターです。
C1 noun /ˈfɛlən/

felon

犯罪者
Meaning
a person who has committed a serious crime
Example
The felon was sentenced to ten years in prison.
犯罪者は10年の刑を言い渡された。
C1 adjective /ˈfuːlpruːf/

foolproof

失敗しない
Meaning
Designed to be very easy to use or understand, leaving no possibility of failure or error.
Example
The new software has a foolproof installation process.
新しいソフトウェアには失敗しないインストールプロセスがあります。
C2 verb /ˈflædʒəˌleɪt/

flagellate

鞭打つ、または罰として自分を鞭打つ
Meaning
to whip or flog someone, either literally or as a form of punishment or self-discipline
Example
In history, some monks would flagellate themselves as penance.
歴史の中で、一部の修道士は悔い改めとして自分をフラジェレイトしていた。
B1 noun /fæts/

fats

脂肪
Meaning
Essential macronutrients that provide energy, support cell growth, and protect organs while helping absorb vitamins.
Example
Healthy fats from nuts and avocados support brain function.
ナッツとアボカドから得られる健康的な脂肪は、脳機能をサポートします。
C2 verb /feɪz/

faze

動揺させる
Meaning
to disturb or disconcert someone; to cause to feel unsettled
Example
She was not fazed by the unexpected question.
予期しない質問で動じなかった。
B1 noun /ˈflaʊər veɪs/

Flower-vase

花瓶
Meaning
a decorative container used to hold cut flowers
Example
She placed beautiful roses in the flower vase on the table.
彼女はテーブルの上に花瓶に美しいバラを置きました。
B1 adjective /ˈfrʌstreɪtɪd/

frustrated

フラストレーション
Meaning
feeling annoyed or upset because of inability to achieve something
Example
She felt frustrated after failing the exam.
彼女は試験に失敗した後、フラストレーションを感じました。
A2 determiner/adjective /ˈfjuːər/

fewer

より少ない
Meaning
a smaller number of; not as many
Example
Fewer people attended the meeting than expected.
予想より少ない人々が会議に出席した。
A2 noun /frʌnt/

front

前面
Meaning
the forward-facing part of something
Example
The house has a garden in front.
家の前に庭があります。
B1 noun fəˈsɪl.ɪ.tiz

facilities

施設
Meaning
A place, amenity, or piece of equipment provided for a particular purpose.
Example
Facilities improve industrial productivity.
施設は産業の生産性を向上させます。
B1 noun /fəˈsɪl.ɪ.ti/

facility

施設
Meaning
A place, amenity, or piece of equipment provided for a particular purpose.
Example
The facility was well-maintained.
施設はよく管理されていました。
B2 noun /ˈfɜː.tɪ.laɪ.zər/

fertilizer

肥料
Meaning
a substance added to soil to make plants grow more successfully
Example
Farmers use fertilizer to increase crop production.
農家は作物の生産量を増やすために肥料を使用します。
C1 adjective /ˌfɑːrˈfɛtʃt/

far-fetched

信じがたい
Meaning
unlikely to happen or be true; improbable
Example
His explanation for being late was a bit far-fetched.
彼の遅刻の理由は少し信じがたいものでした。
C2 noun /ˌfɔːrɔːrdɪˈneɪʃən/

foreordination

予定
Meaning
the act of determining something in advance; predestination
Example
The doctrine of foreordination suggests that events are fixed by divine will.
予定説の教義は、出来事は神の意志によって定められていると示唆しています。
C1 verb/noun ˈfæð.əm

fathom

理解する
Meaning
To understand after much thought; to measure the depth of water; to comprehend.
Example
It is difficult to fathom the depths of the ocean.
海の深さを理解するのは難しい。
C1 adjective /ˈfɪk.əl/

Fickle

気まぐれな; 不安定な; 変わりやすい;
Meaning
changeable; inconstant; liable to sudden unpredictable change
Example
His fickle nature made it hard to trust his promises.
彼の気まぐれな性格は、彼の約束を信じることを難しくした。
B2 adjective /ˈfeɪvərəbl/

favourable

好都合な
Meaning
Expressing approval, support, or positivity; advantageous or beneficial
Example
The weather conditions were favourable for the outdoor event.
屋外イベントの天候は好都合でした。
B2 noun /frɔːd/

Fraud

詐欺
Meaning
wrongful or criminal deception intended to result in financial or personal gain
Example
The company was investigated for credit card fraud and money laundering.
その会社はクレジットカード詐欺とマネーロンダリングで調査されました。
C2 verb /ˈfæmɪʃ/

famish

飢える
Meaning
to suffer or cause to suffer from extreme hunger
Example
The stranded hikers began to famish after several days without food.
数日間食べ物がなくて、遭難したハイカーたちは飢えることを始めた。
B2 noun /ˈfaʊn.tən/

Fountain

噴水
Meaning
a natural spring of water; an artificial structure from which water flows
Example
The fountain in the park attracts many visitors.
公園の噴水は多くの訪問者を引き寄せます。
B2 adjective /ˈfɔːrtʃənət/

fortunate

幸運な
Meaning
Having good luck or receiving something desirable by chance.
Example
She was fortunate to escape the accident without injuries.
彼女は事故で怪我をすることなく逃げることができて幸運だった。
C1 adjective ˈfæʃ.ɪst

fascist

ファシスト
Meaning
Relating to or characteristic of fascism; extremely authoritarian.
Example
Fascist governance undermines freedom.
ファシスト政権は自由を脅かす。
C1 noun /ˈfiːtəs/

fetus

胎児
Meaning
an unborn or unhatched offspring in the womb or egg
Example
The doctor explained the development of the fetus during pregnancy.
医師は妊娠中の胎児の発達について説明しました。
C1 adjective /ˈfeɪl.seɪf/

fail-safe

故障防止
Meaning
designed to prevent failure or accidents; guaranteed to work correctly
Example
The engineers installed a fail-safe mechanism in the nuclear plant.
エンジニアは原子力発電所に故障防止メカニズムを設置しました。
B1 noun /ˌfɜːrst ˈeɪd/

first aid

応急処置
Meaning
Immediate assistance given to a sick or injured person until full medical treatment is available
Example
He gave first aid to the injured cyclist before the ambulance arrived.
彼は救急車が来る前に、負傷した自転車乗りに応急処置を施した。
B2 adjective /ˈfræʤaɪl/

fragile

壊れやすい
Meaning
Easily broken or damaged; delicate.
Example
Be careful with that vase, it's very fragile.
その花瓶には気をつけて、すごく壊れやすいから。
C2 noun /ˈfaɪnəri/

finery

高級または装飾的な服
Meaning
expensive or elaborate clothes, decorations, or accessories
Example
She attended the party in her finest finery.
彼女は最上の衣装でパーティーに出席した。
A1 noun /ˈfʊtˌbɔːl/

football

サッカー
Meaning
A team sport played with a ball that is kicked or carried to score points.
Example
They watched a football match on TV.
彼らはテレビでサッカーの試合を見ました。
C1 adjective /freɪl/

frail

脆弱
Meaning
Physically weak and delicate.
Example
The old man was too frail to walk without help.
その高齢者は助けなしでは歩けないほど脆弱だった。
C1 adjective /ˈfɛrəl/

feral

野生の
Meaning
existing in a wild or untamed state; not domesticated
Example
The feral cat roamed the streets at night.
その野良猫は夜に街を歩き回っていた。
C2 adjective /ˈfiːbəlˌmaɪndɪd/

feebleminded

愚かまたは弱い精神の
Meaning
lacking intelligence or mental capacity; foolish or weak-minded
Example
The feebleminded man struggled to understand basic instructions.
その弱い精神の男性は、基本的な指示を理解するのに苦労していました。
B2 adverb /ˈfɜ:rst hænd/

First-hand

直接; 原始の源から
Meaning
directly experienced or obtained; from the original source
Example
I experienced the earthquake first-hand.
私は地震を直接体験しました。
C1 noun/adjective /fɔːrˈboʊdɪŋ/

foreboding

不吉な予感
Meaning
A feeling that something bad will happen; ominous.
Example
She felt a deep sense of foreboding as she entered the abandoned house.
彼女は廃屋に入るとき、深い不吉な予感を感じた。
C1 noun ˌfɔːtɪfɪˈkeɪʃn

fortification

要塞化
Meaning
A defensive wall or other reinforcement built to strengthen a place against attack.
Example
The fortifications protected the city.
要塞化は都市を守った。
C2 adjective /ˈfluːtɪd/

fluted

溝が入った
Meaning
having grooves or ridges, often for decoration
Example
The vase had a beautiful fluted design around the rim.
その花瓶は縁に美しい溝が入ったデザインがありました。
B2 noun/verb /ˈfɒs.tər.ɪŋ/

fostering

育成
Meaning
The process of encouraging or promoting the development or growth of something; nurturing and caring for.
Example
Good teachers play a key role in fostering creativity in students.
良い教師は学生の創造性を育む上で重要な役割を果たします。
A2 adjective /ˈflaɪɪŋ/

flying

飛んでいる
Meaning
able to move through the air; related to flight or aircraft
Example
The flying bird disappeared into the clouds.
飛んでいる鳥は雲の中に消えました。
C1 verb /ˈfɔːltər/

falter

ためらう、または力や勢いを失う
Meaning
to hesitate or lose strength or momentum
Example
Her voice faltered as she delivered the speech.
彼女の声はスピーチをする際に途切れました。
C1 noun /faɪˈnælɪti/

finality

決定的な性質
Meaning
the quality of being final or irreversible; a sense of conclusiveness
Example
The judge's decision gave the case a sense of finality.
裁判官の決定はその事件に決定的な感覚を与えた。
B2 noun /ˈfeɪbəl/

fable

寓話
Meaning
a short story, typically featuring animals as characters, that conveys a moral lesson
Example
Aesop’s fables are famous for teaching valuable lessons through simple stories.
イソップの寓話は、簡単な物語を通して貴重な教訓を教えることで有名です。
C1 noun /ˌfɪɡjʊˈriːn/

figurine

小さな装飾用の像
Meaning
a small ornamental statue or model of a human or animal
Example
She bought a porcelain figurine of a dancing ballerina.
彼女はダンスをするバレリーナの陶器のフィギュリンを買いました。
B2 noun /ˈfriː.kwən.si/

Frequency

頻度
Meaning
the rate at which something occurs or is repeated over a particular period of time
Example
The frequency of earthquakes in this region has increased dramatically over the past decade.
この地域の地震の頻度は過去10年間で劇的に増加しました。
A2 verb /faɪt/

fight

戦う
Meaning
to engage in battle or combat; to struggle against
Example
The soldiers fight for their country.
兵士たちは自国のために戦っています。
B2 noun /ˈfreɪ.ɡrəns/

Fragrance

香り; 香水
Meaning
a pleasant, sweet smell; a perfume or cologne
Example
The fragrance of jasmine flowers filled the entire garden in the evening.
ジャスミンの花の香りが夕方、庭全体に広がった。
C1 noun /ˈfreɪlti/

frailty

脆弱
Meaning
The condition of being weak, delicate, or easily broken.
Example
Old age often comes with physical frailty.
老化はしばしば身体的な脆弱さと共に訪れます。
B2 noun ˈflæʃkɑːrdz

flashcards

フラッシュカード
Meaning
Cards containing small amounts of information, held up for students to see, as an aid to learning.
Example
Flashcards help in quick memorization.
フラッシュカードは迅速な記憶に役立ちます。
C2 noun /ˈfɪɡmənt/

figment

虚構, 想像
Meaning
something invented or imaginary; a fabrication of the mind
Example
The story of the haunted house is just a figment of her imagination.
幽霊屋敷の話は、彼女の想像の産物に過ぎない。
A1 adverb /fɑːr/

far

遠い
Meaning
at, to, or by a great distance
Example
The school is far from my house.
学校は私の家から遠いです。
C2 noun /fiːˈkʌndɪti/

fecundity

肥沃, 繁殖力
Meaning
the ability to produce an abundance of offspring or new growth; fertility
Example
The fecundity of the river delta supports diverse wildlife.
川の三角州の肥沃は多様な野生動物を支えています。
B1 noun /ˈfɪkʃən/

fiction

フィクション
Meaning
Literature created from the imagination, not presented as fact.
Example
She enjoys reading science fiction novels.
彼女はサイエンスフィクション小説を読むのが好きです。
C1 noun /fɪˈnɛs/

finesse

巧妙さ, 技量, 洗練
Meaning
Subtlety and skill; refinement and delicacy in performance or artistry.
Example
The artist painted with great finesse.
そのアーティストは大きな巧妙さで絵を描いた。
A1 noun/verb /fɪʃ/

fish

幸せ
Meaning
an aquatic animal with gills, or to try to catch such animals
Example
He went to the lake to fish early in the morning.
彼女は賞を受け取ったとき、幸せを隠すことができなかった。
C2 adjective fɔːˈtjuː.ɪ.təs

fortuitous

偶然の
Meaning
Happening by accident or chance rather than design; lucky or fortunate.
Example
Their meeting was purely fortuitous.
彼らの出会いは完全に偶然でした。
A1 noun/verb /fɪlm/

film

映画
Meaning
a motion picture or movie; or to record on camera
Example
They watched a film together on the weekend.
彼らは週末に一緒に映画を見ました。
B1 noun /ˈfɪnɪʃ laɪn/

finish line

ゴールライン
Meaning
The line or point at the end of a race or competition where participants complete it.
Example
She sprinted towards the finish line and won the race.
彼女はフィニッシュラインに向かって全力で走り、レースに勝った。
B2 verb ˈfaɪ.nəl.aɪz

finalize

最終決定する
Meaning
To complete arrangements for something; put into final form.
Example
The treaty was finalized after the discussions.
協定は討論後に最終決定されました。
C2 adjective/adverb /feɪn/

fain

喜んで、喜んで
Meaning
gladly, willingly, or with pleasure
Example
I would fain help you if I had the time.
もし時間があれば、喜んであなたを助けます。
C2 verb /ˈfjuːmɪˌɡeɪt/

fumigate

燻蒸する
Meaning
to disinfect or purify an area by using chemical fumes
Example
They fumigated the warehouse to kill the insects.
彼らは昆虫を殺すために倉庫を燻蒸しました。
C1 noun, verb /ˈfɛrɪt/

ferret

フェレット, 何かを粘り強く探すまたは発見する
Meaning
a small domesticated animal used for hunting; to search or uncover something persistently
Example
He ferreted out the hidden documents.
彼は隠された書類を見つけました。
C2 noun /ˈfiːæt/

fiat

命令、布告
Meaning
an official order or decree; authoritative command
Example
The new policy was enacted by royal fiat.
新しい政策は王の命令で実施されました。
C1 adjective /ˈfɔːrmətɪv/

formative

形成的
Meaning
Having a lasting influence on a person's development or character.
Example
Childhood is often described as a formative stage in life.
子供時代は人生の中で形成的な段階としてよく説明されます。
C2 noun /fækˈsɪmɪli/

facsimile

コピー
Meaning
an exact copy or reproduction of a document
Example
He sent a facsimile of the contract to the client.
彼は契約書のコピーをクライアントに送った。
C2 adjective /ˈflæs.ɪd/

Flaccid

しなびた; やわらかい; 弛んだ;
Meaning
soft and limp; lacking firmness; drooping
Example
The plant's leaves became flaccid after days without water.
水がない数日後、植物の葉がしなびました。
B2 noun /ˈfræɡ.mənt/

Fragment

断片; 部分;
Meaning
a small part broken or separated off something; an incomplete or isolated portion
Example
Archaeologists found fragments of ancient pottery buried in the soil.
考古学者たちは土の中で古代の陶器の断片を発見しました。
C2 noun ˌfjuːmɪˈɡeɪʃən

fumigation

燻蒸
Meaning
The practice of disinfecting or purifying an area using gas or smoke.
Example
Fumigation is an effective method to control pest infestations.
消毒は害虫の侵入を制御するための効果的な方法です。
B1 noun /ˈfɛloʊ/

fellow

仲間
Meaning
a person who shares a common situation, interest, or activity with another
Example
He is a fellow student in my class.
彼は私のクラスの仲間です。
C2 noun /ˈflɒtsəm/

flotsam

漂流物
Meaning
Floating debris from a shipwreck or things discarded and left floating.
Example
The beach was littered with flotsam after the storm.
嵐の後、ビーチは漂流物で埋め尽くされていた。
A1 verb /ˈfɪnɪʃ/

finish

終わらせる
Meaning
to complete or bring to an end; to reach the final point
Example
She finished her homework before dinner.
彼女は夕食前に宿題を終わらせた。
A2 adverb /fɔːrˈɛvər/

forever

永遠
Meaning
For all future time; for always.
Example
She promised to love him forever.
彼女は永遠に彼を愛すると約束した。
C2 noun /ˈfʌriər/

furrier

毛皮商人
Meaning
A person who prepares or deals in furs.
Example
The furrier displayed fine coats in his shop.
毛皮商人は店に美しいコートを展示しました。
C1 adjective /ˈflaʊəri/

flowery

花のような / 飾られた
Meaning
Full of flowers or overly elaborate in style or language.
Example
She wrote a flowery letter filled with poetic phrases.
彼女は詩的なフレーズで満たされた花のような手紙を書いた。
C1 noun/verb /ˈfʌrəʊ/

furrow

Meaning
A long narrow trench made in the ground by a plow; to make wrinkles or grooves.
Example
The farmer plowed furrows in the field.
C2 noun /ˈflæɡ ˌɒfɪsər/

flag-officer

旗艦司令官
Meaning
a senior naval officer entitled to fly a flag to mark the command
Example
The flag-officer reviewed the fleet before the ceremony.
旗艦司令官は儀式の前に艦隊を視察しました。
C2 adjective /ˈfæl.oʊ/

fallow

休耕地
Meaning
Describing land that is left unplanted for a period to restore its fertility, allowing soil to recover nutrients and break pest and disease cycles.
Example
Farmers leave their fields fallow to restore soil fertility.
農家は土壌の肥沃度を回復させるために畑を休ませます。
C2 noun /ˈfɜːrlɔːŋ/

furlong

距離の単位（220ヤードまたは約201メートル）
Meaning
a unit of distance equal to 220 yards or about 201 meters
Example
The horse ran a furlong before slowing down.
馬はファーロングを走った後、減速した。