fluctuate
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C1 verb ˈflʌk.tʃu.eɪt

fluctuate

変動する
Meaning
To regularly increase or decrease.
Example
Stock prices fluctuate due to market conditions.
株価は市場の状況によって変動します。
A1 noun /ˈfɑːðər/

father

幸福
Meaning
A male parent of a child.
Example
His father taught him how to ride a bicycle.
彼女は賞を受け取ったとき、その幸せを隠せなかった。
B2 adjective, noun /ˈfeɪʃəl/

facial

フェイシャル
Meaning
Relating to the face; a beauty treatment for the face
Example
She booked a facial at the spa.
彼女はスパでフェイシャルを予約しました。
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 /ˈfɛdərət/

federate

連邦する
Meaning
to unite in a league or federation; to form an alliance
Example
Several states federated to create a stronger union.
いくつかの州が強い連邦を作るために団結しました。
C2 noun /fɔːn/

faun

ファウノ (神話の生き物)
Meaning
a mythological creature that is half human and half goat
Example
The sculpture depicted a playful faun dancing in the forest.
彫刻は、森の中で踊っている遊び心のあるファウンを描いていました。
C1 noun /flæt fɪʃ/

Flat fish

カレイ
Meaning
a type of fish with a flattened body that lives on the sea floor
Example
Flat fish like sole and flounder are excellent for grilling.
カレイやヒラメのようなフラットフィッシュはグリルに最適です。
C1 noun ˌfiː.zəˈbɪl.ə.ti

feasibility

実現可能性
Meaning
The state or degree of being easily or conveniently done; possibility.
Example
The company conducted a feasibility study before launching the project.
会社はプロジェクトを開始する前に実現可能性調査を行った。
A1 noun /fruːt/

fruit

果物
Meaning
The sweet and fleshy product of a plant that contains seeds.
Example
Mango is my favorite fruit.
マンゴーは私のお気に入りのフルーツです。
A2 adjective /fer/

Fair

公正な; 妥当な; 魅力的な
Meaning
just and reasonable; treating people equally; light in color; attractive
Example
The judge made a fair decision in the case.
裁判官はその事件で公正な判断を下しました。
A1 noun /faɪər/

Fire

火
Meaning
combustion or burning, in which substances combine chemically with oxygen from the air
Example
The fire in the fireplace provided warmth and a cozy atmosphere.
暖炉の火は温かさと居心地の良い雰囲気を提供しました。
B1 noun /frʌˈstreɪʃən/

frustration

フラストレーション
Meaning
The feeling of being upset or annoyed due to inability to achieve something.
Example
He felt deep frustration when his plans failed.
彼は自分の計画が失敗したとき、深いフラストレーションを感じました。
A2 adverb/adjective/verb /ˈfɜːrðər/

further

進める
Meaning
At a greater distance; to advance or promote something.
Example
She studied hard to further her career.
彼女はキャリアを進めるために一生懸命勉強した。
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。
B2 noun ˈfeɪs tə ˈfeɪs ˈbætl

face-to-face battle

面と面の戦い
Meaning
A direct confrontation or fight between opposing forces.
Example
The warriors fought a face-to-face battle with the enemies.
戦士たちは敵と面と面で戦った。
C1 verb /flɑp/

flop

失敗
Meaning
to fall or move heavily and clumsily; to fail completely
Example
The new movie flopped at the box office.
新しい映画は興行成績が振るわなかった。
C1 verb /fɔːrˈtɛl/

foretell

予知する
Meaning
to predict or announce something before it happens
Example
The old man claimed he could foretell the future.
その老人は未来を予知できると主張した。
B2 noun /ˈfjuː.nər.əl/

Funeral

葬式
Meaning
a ceremony typically held shortly after a person's death, usually including burial or cremation
Example
Hundreds of people attended the funeral to pay their respects to the beloved teacher.
何百人もの人々が葬式に出席し、愛された教師に敬意を表しました。
C2 adjective /ˈfɛkləs/

feckless

無能な, 責任感のない
Meaning
lacking initiative or strength of character; irresponsible
Example
His feckless attitude at work caused several missed deadlines.
彼の無能な態度が仕事でいくつかの期限を逃す原因となった。
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。
C1 noun /fəˈsɑːd/

facade

ファサード
Meaning
The front of a building; a false or superficial appearance
Example
The building's glass facade reflected the sunset.
建物のガラスのファサードは日没を反映していた。
C2 noun /ˈfoʊksl/

forecastle

フォアキャッスル
Meaning
The forward part of a ship below the deck, traditionally used as living quarters for the crew.
Example
The sailors gathered in the forecastle after their shift.
船員たちはシフト後にフォアキャッスルに集まりました。
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。
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。
C2 noun /ˈfʌstɪən/

fustian

浮かれたスピーチ
Meaning
pompous or pretentious speech or writing; originally a type of thick cloth
Example
The politician's speech was filled with fustian and empty promises.
政治家のスピーチは浮かれた言葉と空っぽの約束でいっぱいだった。
C1 noun /fɔːn/

Fawn

子鹿
Meaning
a young deer; a light yellowish-brown color
Example
The mother deer protects her fawn from predators.
母鹿は捕食者から子鹿を守ります。
C1 noun fɔːlt ˈtɒl.ər.əns

fault-tolerance

フォールトトレランス
Meaning
The ability of a system to continue operating properly in the event of the failure of some of its components.
Example
Fault-tolerance ensures dependable systems.
フォールトトレランスは信頼性のあるシステムを保証します。
C1 adjective /ˈfɪs.kəl/

fiscal

財政の
Meaning
Relating to government revenue, especially taxes, or public money management.
Example
The government introduced new fiscal policies to control inflation.
政府はインフレを抑制するために新しい財政政策を導入しました。
A1 noun /fʊt/

Foot

足
Meaning
the lower extremity of the leg that is in direct contact with the ground in standing or walking
Example
She hurt her foot while running.
彼女は走っている間に足を怪我しました。
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 adjective /fəˈloʊniəs/

felonious

重大な犯罪に関連する
Meaning
relating to or involved in serious criminal activity
Example
He was charged with felonious assault after the incident.
事件の後、彼は重罪暴行で起訴されました。
C2 noun /ˈfiːəlti/

fealty

忠誠心と誠実
Meaning
loyalty or allegiance, especially to a sovereign or lord
Example
The knight swore fealty to his king.
騎士は王に忠誠を誓った。
B2 verb /flɜːrt/

flirt

Meaning
to behave as if you are attracted to someone, but not in a serious way
Example
She often flirts with her colleagues at work.
C1 noun /ˈfɔːrdʒəri/

forgery

偽造
Meaning
the crime of making fake documents, money, or artworks
Example
The bank detected a forgery in the signature on the cheque.
銀行は小切手の署名に偽造を発見しました。
C2 noun /fɔːrˈbɛrəns/

forbearance

寛容
Meaning
Patient self-control; restraint and tolerance, especially in difficult situations.
Example
She showed remarkable forbearance during the heated argument.
彼女は激しい議論の中で驚くべき寛容さを示しました。
C2 noun /ˈfoʊ.li.oʊ/

folio

大きな本や写本
Meaning
A sheet of paper folded once to form two leaves (four pages) of a book; also a term for a large book or manuscript.
Example
The library houses an ancient Shakespeare folio.
図書館には古いシェイクスピアのフォリオがあります。
C1 verb /ˈfɜːrmɛnt/

ferment

化学的なプロセスを経て、糖分がアルコールや酸に変換されること; 変化を促進または引き起こすこと
Meaning
to undergo a chemical process where sugars are converted to alcohol or acid; to incite or stir up change
Example
The grapes are left to ferment for several weeks.
ぶどうは数週間発酵させられます。
C1 noun /ˈfʊtˌnoʊt/

foot-note

脚注
Meaning
A note of reference, explanation, or comment placed at the bottom of a page.
Example
The author included a foot-note to explain the historical context.
著者は歴史的な文脈を説明するために脚注を追加しました。
C1 noun /foʊ/

foe

敵
Meaning
an enemy or opponent
Example
The knight fought bravely against his foe.
騎士は勇敢に自分の敵と戦った。
A1 noun /ˈflaʊər/

flower

花
Meaning
the seed-bearing part of a plant, often colorful and fragrant, that blossoms
Example
The garden was full of colorful flowers.
庭はカラフルな花でいっぱいでした。
A2 verb ˈfoʊkəs

focus

集中する
Meaning
To concentrate attention or effort on something; to direct one's attention or efforts towards a particular activity, subject, or problem.
Example
Focus on what truly matters to simplify your life.
本当に重要なことに集中して、人生をシンプルにしましょう。
B1 verb /floʊt/

float

浮かぶ
Meaning
to rest or move on the surface of a liquid or in the air without sinking
Example
The boat began to float gently down the river.
ボートは静かに川を下って浮かび始めました。
C2 verb /fɔːrˈfɛnd/

forfend

守る, 防ぐ, 防止する
Meaning
to protect or defend against something undesirable; to prevent
Example
May good fortune forfend any danger from our journey.
良い運が私たちの旅からどんな危険も防いでくれますように。
C1 noun /ˈfʌŋɡəs/

fungus

菌類
Meaning
a spore-producing organism feeding on organic matter, including molds, yeast, and mushrooms
Example
A strange fungus was growing on the old tree.
古い木に奇妙な菌類が生えていました。
C1 noun /ˈflæt.ər.i/

Flattery

お世辞
Meaning
excessive and insincere praise, given especially to further one's own interests
Example
His constant flattery made everyone suspicious of his true motives.
彼の絶え間ないお世辞は、皆が彼の本当の意図を疑わせることになった。
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。
B2 noun /fɔːrt/

Fort

砦
Meaning
a strong building or group of buildings where soldiers live and defend
Example
The ancient fort stood on top of the hill for centuries.
古代のフォートは何世代にもわたって丘の上に立っていました。
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。
A2 adjective /fəˈmɪl.jər/

Familiar

馴染みのある; 親しみやすい; インフォーマルで友好的
Meaning
well-known; easily recognized; having knowledge of; informal and friendly
Example
This song sounds familiar to me.
この歌は私には馴染みがあるように感じます。
C1 noun /fɔːrˈkloʊʒər/

foreclosure

差し押さえ
Meaning
The legal process by which a lender takes control of a property from a borrower who has failed to make payments.
Example
The family lost their home due to foreclosure after missing several mortgage payments.
その家族は複数回のモーゲージ支払いを逃したため、差し押さえで家を失いました。
A2 noun/verb /ˈfɪʃɪŋ/

fishing

釣り
Meaning
the activity of catching fish
Example
Fishing is a popular activity in coastal villages.
フィッシングは沿岸の村で人気のある活動です。
B1 noun /ˈfeɪvər/

favor

お願い
Meaning
An act of kindness or approval.
Example
She asked him for a small favor.
彼女は彼に小さなお願いをした。
B1 adjective /ˈfəʊkəst/

focused

集中
Meaning
Directing a great deal of attention or effort toward a particular activity, situation, or person.
Example
Staying focused during work hours enhances productivity.
勤務時間中に集中することで生産性が向上します。
A2 noun /ˈfɪŋ.ɡər/

Finger

指
Meaning
any of the four long thin parts of the hand (or five, if the thumb is included)
Example
She pointed with her finger to show the direction to the museum.
彼女は指を使って博物館の方向を指し示しました。
B1 noun /feɪm/

Fame

名声
Meaning
the condition of being known or talked about by many people
Example
The young actor achieved international fame with his latest movie.
若い俳優は最新の映画で国際的な名声を得ました。
C1 adjective /ˈfruː.ɡəl/

Frugal

節約的; 倹約的
Meaning
economical; thrifty;
Example
She is very frugal and saves money by buying only necessary items.
彼女はとても倹約的で、必要な物だけを買ってお金を節約しています。
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。
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。
A1 adjective/noun /fɔːrθ/

fourth

第四
Meaning
Constituting number four in a sequence; coming after the third in position.
Example
He finished in fourth place in the race.
彼はレースで第四位になった。
C2 noun /ˈfɔːrˌnɑːlɪdʒ/

foreknowledge

予知
Meaning
Awareness of something before it happens or exists.
Example
The prophet claimed to have foreknowledge of the event.
預言者はその出来事の予知をしていると主張した。
B2 noun ˈflaɪ.ɪŋ kɑːrz

flying cars

空飛ぶ車
Meaning
Vehicles that can travel both on roads and in the air.
Example
Flying cars could soon solve urban traffic congestion.
空飛ぶ車はすぐに都市の交通渋滞の問題を解決できるでしょう。
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。
C1 adjective /ˈfliː.tɪŋ/

fleeting

儚い
Meaning
Lasting for a very short time; passing quickly.
Example
Happiness can be fleeting, so cherish every moment.
幸せは儚いものである可能性があるので、すべての瞬間を大切にしてください。
B2 adverb /ˈfeɪθ.fəl.i/

Faithfully

忠実に
Meaning
in a loyal and steadfast manner; with dedication
Example
She faithfully attended every meeting despite her busy schedule.
彼女は忙しいスケジュールにもかかわらず、毎回忠実に会議に出席しました。
C2 noun /ˈflɪpənsi/

flippancy

軽薄
Meaning
lack of seriousness; showing a disrespectful or trivial attitude
Example
His flippancy during the meeting offended his colleagues.
会議中の彼の軽薄さは、同僚を不快にさせた。
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。
C1 noun ˈfɜːr.vɚ

fervor

情熱または熱意
Meaning
Strong passion or enthusiasm for something.
Example
He spoke with great fervor about his vision for the company.
彼は会社のビジョンについて熱心に話しました。
B2 noun ˈfrʌn.tɪərz

frontiers

最前線
Meaning
The extreme limit of settled land beyond which lies wilderness; the limits of knowledge or achievement in a particular field.
Example
The project pushes the frontiers of space exploration.
このプロジェクトは宇宙探査の最前線を押し広げています。
B2 noun /ˌfiː.ɑːnˈseɪ/

Fiancee

婚約者
Meaning
a woman who is engaged to be married
Example
John bought a beautiful engagement ring for his fiancee.
ジョンは彼の婚約者に美しい婚約指輪を買いました。
A2 noun /fæn/

Fan

ファン; 愛好者; 扇風機
Meaning
a person who has a strong interest in or admiration for a particular person or thing; a device for creating air current
Example
She is a huge fan of classical music and attends every concert in the city.
彼女はクラシック音楽の大ファンで、市内のすべてのコンサートに参加しています。
C1 noun /ˈfɔː.nə/

fauna

特定の地域の動物の生命
Meaning
The animal life of a particular region, habitat, or geological period.
Example
The fauna of the African savannah includes lions and elephants.
アフリカのサバンナの動物はライオンと象を含みます。
C1 adjective /ˈfiːzəbl/

feasible

実行可能
Meaning
possible to do easily or conveniently; practical and workable
Example
It is feasible to complete the project within two months.
このプロジェクトを2ヶ月以内に完了することは実行可能です。
C1 noun/verb /fliːs/

fleece

Meaning
The woolly covering of a sheep; as a verb, to swindle or cheat someone.
Example
The farmer sheared the sheep’s fleece carefully.
B2 noun /fɛər/

fare

運賃
Meaning
the money paid for a journey on public transport; also food or treatment provided
Example
The bus fare to the city center is five dollars.
市内中心部までのバス運賃は5ドルです。
C2 adjective /ˈfɛstəl/

festal

祭りの、祝祭的な
Meaning
relating to a festival or celebration
Example
The hall was decorated in a festal manner for the wedding.
結婚式のためにホールは祭りのように飾られていました。
C2 adjective /ˈfraɪəbl/

friable

もろい
Meaning
Easily crumbled or reduced to powder.
Example
The old brick wall was friable and broke apart at a touch.
古いレンガの壁はもろく、触れると壊れました。
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 /ˈfaɪə.ri/

Fiery

燃えるような; 熱心な; 怒りっぽい
Meaning
burning; passionate; hot-tempered; showing strong emotion
Example
She has a fiery temper that flares up quickly.
彼女はすぐに燃えるような性格で、すぐに怒る。
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 verb /ˈfʌmbəl/

fumble

不器用にする
Meaning
to handle something clumsily or to make mistakes while doing something
Example
He fumbled with the keys and dropped them on the floor.
彼は鍵で手間取って、それらを床に落としました。
C2 noun /ˈfriːˌbuːtər/

freebooter

海賊
Meaning
A pirate or plunderer who roams freely in search of wealth.
Example
The freebooter raided the merchant ships along the coast.
海賊は沿岸の商船を襲った。
C1 noun /fɪlθ/

filth

汚れ
Meaning
dirty or disgusting matter; moral corruption
Example
The streets were full of filth after the storm.
嵐の後、通りは汚れでいっぱいでした。
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。
A2 noun /ˈfaɪəˌwɜːk/

firework

花火
Meaning
a device that explodes or creates a display of lights and sounds, often used in celebrations
Example
The fireworks lit up the sky during the New Year's Eve celebration.
花火は新年の前夜祭で空を照らしました。
C1 noun /ˌfɜːrmənˈteɪʃən/

fermentation

発酵、酵母または細菌による化学変化
Meaning
a chemical process by which substances like sugar are converted into alcohol or acids using microorganisms
Example
The fermentation of grapes produces wine.
ぶどうの発酵はワインを生産します。
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。
C1 noun /fɪkˈseɪ.ʃən/

fixation

執着や過度な興味
Meaning
An obsessive interest in or feeling about someone or something.
Example
His fixation on perfectionism delayed project completion.
完璧主義への執着がプロジェクトの完了を遅らせた。
C2 adjective /ˈfiːkənd/

fecund

肥沃な, 生産的な
Meaning
producing or capable of producing an abundance of offspring or new growth; fertile
Example
The fecund soil produced a bountiful harvest this year.
肥沃な土壌は今年豊かな収穫をもたらしました。
A1 noun /ˈfæməli/

family

家族
Meaning
A group consisting of parents and their children, or all the descendants of a common ancestor.
Example
She spends most of her weekends with her family.
彼女は週末のほとんどを家族と過ごします。
C1 noun /fiːt/

feat

偉業
Meaning
an achievement that requires great courage, skill, or strength
Example
Climbing Mount Everest was a remarkable feat.
エベレスト山の登頂は素晴らしい偉業でした。
C1 noun /ˈfæk.ʃən/

Faction

派閥
Meaning
a small organized dissenting group within a larger one
Example
Different factions within the party disagreed about the new policy.
党内の異なる派閥は新しい政策に対して意見が一致しませんでした。
C2 noun /ˈflɛkʃən/

flection

屈曲
Meaning
The act of bending or the state of being bent, especially of a limb or joint.
Example
The doctor tested the patient's knee flection during the examination.
医者は検査中に患者の膝の屈曲をテストしました。
C1 noun /ˈfaɪərɑːm/

firearm

火器
Meaning
a weapon capable of firing a projectile using gunpowder or other propellant
Example
The police found a hidden firearm during the investigation.
警察は調査中に隠された銃器を発見しました。
B1 noun /flæʃ/

Flash

フラッシュ; ひらめき
Meaning
a sudden brief burst of bright light; a very brief moment
Example
There was a bright flash of lightning followed by thunder.
雷鳴の後に明るい閃光がありました。
B2 noun /ˈfaɪbər/

fiber

繊維
Meaning
a thread or filament from which a textile is formed; dietary substance from plants that aids digestion
Example
Fruits and vegetables are high in fiber.
果物と野菜は繊維が豊富です。
C1 noun /ˈfrek.əl/

Freckle

そばかす
Meaning
a small brownish spot on the skin, often becoming more pronounced through exposure to the sun
Example
Her face was covered with cute freckles that appeared every summer.
彼女の顔は可愛いそばかすで覆われていて、毎年夏になると現れます。
C1 adjective /fəˈroʊ.ʃəs/

Ferocious

凶暴な, 激しい, 残忍な
Meaning
savagely fierce, cruel, or violent; extremely aggressive
Example
The ferocious storm destroyed many houses in the coastal area.
激しい嵐は沿岸地域の多くの家を破壊しました。
B2 noun /ˈfʊtɪdʒ/

footage

ビデオ録画
Meaning
a recorded film or video, especially one that is used for news or documentaries
Example
The footage of the protest was shown on television all day.
抗議の映像は一日中テレビで放送されました。
A2 noun ˈfriː.dəm

freedom

自由
Meaning
The power or right to act, speak, or think as one wants without hindrance or restraint.
Example
Freedom empowers self-expression.
自由は自己表現を促進します。
B2 adjective /fəˈbɪd.ən/

Forbidden

禁止された; 違法な
Meaning
not allowed; prohibited; banned
Example
Smoking is strictly forbidden in this building.
この建物では喫煙が厳しく禁止されています。
B2 noun /ˈflɒrɪst/

florist

花屋
Meaning
A person who sells and arranges flowers.
Example
We bought a bouquet from the local florist.
私たちは地元の花屋から花束を買いました。
B1 noun /ˈfaɪər.mən/

Fireman

消防士
Meaning
a person whose job is to extinguish fires and rescue people
Example
The brave fireman rescued the family from the burning building.
勇敢な消防士は燃えている建物から家族を救いました。
A2 adjective /flæt/

flat

平ら
Meaning
Smooth and level, without raised areas or curves.
Example
The road ahead was completely flat.
前方の道路は完全に平らでした。
A2 noun /fækt/

fact

事実
Meaning
A thing that is known or proved to be true
Example
It is a fact that the Earth orbits the Sun.
地球が太陽の周りを回っているのは事実です。
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。
C1 adjective fæsˈtɪd.i.əs

fastidious

几帳面な
Meaning
Very attentive to and concerned about accuracy and detail.
Example
She is fastidious about maintaining cleanliness.
彼女は清潔を保つことにとても几帳面だ。
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。
B2 adverb /ˈfræŋkli/

Frankly

率直に; 正直に;
Meaning
honestly; openly; in a direct manner
Example
Frankly, I think this plan needs more consideration.
率直に言うと、この計画にはもっと考慮が必要だと思います。
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。
B2 noun /ˈfɪlmˌmeɪkər/

film-maker

映画製作者
Meaning
A person who directs or produces films
Example
The film-maker received an award for his latest documentary.
映画製作者は最新のドキュメンタリーで賞を受賞しました。
C2 verb /fɔrˈswɛr/

forswear

放棄する
Meaning
to renounce or reject; to give up completely
Example
He forswore his old habits and started a new life.
彼は古い習慣を捨て、新しい人生を始めました。
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。
B2 adjective /ˈfeɪtl/

fatal

致命的
Meaning
causing death; leading to disaster
Example
The accident proved fatal for the driver.
その事故は運転手にとって致命的だった。
C2 adjective /ˈfæsaɪl/

Facile

簡単な; 浅薄な; 深みのない
Meaning
easily achieved; superficial; lacking depth
Example
His facile explanation didn't address the real problem.
彼の簡単な説明は実際の問題に対処しませんでした。
C2 noun /fɪntʃ/

finch

フィンチ（小さな歌う鳥）
Meaning
a small songbird with a short, stout bill
Example
A colorful finch perched on the branch singing sweetly.
カラフルなフィンチが枝に止まり、甘い歌を歌っていました。
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。
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。
A2 noun /fɒks/

Fox

キツネ
Meaning
a wild animal related to dogs, with a pointed face and thick fur
Example
The red fox is known for its cunning nature.
赤いキツネはそのずる賢い性格で知られています。
B2 verb /fjuːz/

fuse

融合する
Meaning
To join or blend two or more things together into one.
Example
The two metals fused under high heat.
二つの金属は高温で融合した。
A2 verb /friːz/

freeze

凍る
Meaning
to become solid due to cold; to preserve by cold
Example
Water freezes at zero degrees Celsius.
水は零度で凍ります。
A2 noun /ˈfer.i.teɪl/

Fairy-tale

おとぎ話
Meaning
a children's story about magical and imaginary beings and lands
Example
Children love listening to fairy-tales before bedtime.
子供たちは寝る前におとぎ話を聞くのが大好きです。