forefather
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C1 noun /ˈfɔːrˌfɑːðər/

forefather

先祖
Meaning
an ancestor, especially one who was part of an earlier generation of a family or nation
Example
Our forefathers fought for independence.
私たちの先祖は独立のために戦いました。
C1 noun /ˈfɔːrˌθɔːt/

forethought

先見の明
Meaning
careful consideration of what will be necessary or may happen in the future
Example
With a little forethought, we could have avoided the problem.
少しの先見の明で、この問題を避けることができたかもしれません。
C1 noun /fəˈrɒs.ə.ti/

ferocity

凶暴さ, 暴力, 強さ
Meaning
The state or quality of being ferocious; extreme fierceness or violence.
Example
The storm's ferocity was devastating.
嵐の凶暴さは壊滅的でした。
C1 noun (plural of fungus) /ˈfʌndʒaɪ/

fungi

菌類
Meaning
a group of spore-producing organisms such as mushrooms, molds, and yeasts
Example
Fungi play an important role in breaking down organic matter in nature.
菌類は自然界で有機物を分解する重要な役割を果たします。
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.
C1 verb /flaʊt/

flout

無視する
Meaning
To openly disregard or show contempt for a rule or law.
Example
The company was fined for flouting environmental regulations.
その会社は環境規制を無視したため罰金を科せられました。
C1 noun /ˈfɔːreɪ/

foray

突撃 / 初めての試み
Meaning
A sudden short attack or attempt, especially into new activity or territory.
Example
The company made its first foray into the international market.
その会社は国際市場への初めての進出を果たした。
C1 adjective /ˈfrɪvələs/

frivolous

取るに足らない
Meaning
Not having any serious purpose or value; silly or unimportant.
Example
She dismissed the frivolous complaint quickly.
彼女は取るに足らない苦情をすぐに却下しました。
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。
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 /ˈfɔːrwɜːrd/

foreword

序文
Meaning
a short introduction at the beginning of a book, typically written by someone other than the author
Example
The foreword of the book was written by a famous historian.
その本の序文は、有名な歴史家によって書かれました。
C1 noun /frɪndʒ/

fringe

装飾的縁 / 端
Meaning
A decorative border of threads; the outer edge or margin of something.
Example
The festival had a fringe of small independent performances.
フェスティバルには小さな独立したパフォーマンスの端がありました。
C1 noun /ˈfɔɪeɪr/

foyer

ロビー
Meaning
An entrance hall or lobby in a building.
Example
The guests waited in the hotel foyer before checking in.
ゲストはチェックインする前にホテルのロビーで待っていました。
C1 verb /fɔːˈbɛər/

forbear

控える
Meaning
To refrain from doing something; to show patience or self-control.
Example
She forbore from commenting on his mistake.
彼女は彼の間違いについてコメントするのを控えました。
C1 noun ˌfɜːr.tɪ.laɪˈzeɪ.ʃən

fertilization

肥料施用
Meaning
The process of adding nutrients to soil to increase crop productivity.
Example
Organic fertilization enhances soil health.
有機肥料施用は土壌の健康を改善します。
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 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。
C1 noun /fɪˈnænʃɪər/

financier

金融家
Meaning
a person who manages large amounts of money or investments
Example
The financier advised the company on its investments.
金融家は会社に投資に関するアドバイスをしました。
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。
C1 noun /ˈfɪɡjərˌhɛd/

figurehead

名目上の指導者
Meaning
a nominal leader with no real power; a symbolic head
Example
The king was merely a figurehead with no real authority.
王は実際の権限を持たない象徴的な指導者に過ぎなかった。
C1 verb /fret/

fret

心配する
Meaning
to worry or be anxious; to be troubled
Example
Don't fret about the exam results.
試験結果について心配しないでください。
C1 adjective /flæmˈbɔɪənt/

flamboyant

派手で色鮮やかな、または自信に満ちた
Meaning
showy, strikingly bold or colorful; confident and lively
Example
His flamboyant style drew everyone's attention at the party.
彼の派手なスタイルはパーティーで皆の注目を集めました。
C1 noun /ˌfæb.rɪˈkeɪ.ʃən/

fabrication

虚偽の発明
Meaning
The invention of false or misleading information; a lie or falsehood.
Example
The article was full of fabrication and misleading claims.
その記事は虚偽の発明と誤解を招く主張で満ちていました。
C1 noun /ˈfæs.ɪt/

facet

側面, 部分, 特徴
Meaning
One of the many aspects or features of something; a particular part or element of something.
Example
Every facet of the project was carefully analyzed.
プロジェクトの各側面は慎重に分析されました。
C1 noun /ˈflæn.əl/

Flannel

フランネル
Meaning
a soft woven fabric, typically made of wool or cotton and slightly milled and raised
Example
He wore a warm flannel shirt in winter.
彼は冬に暖かいフランネルシャツを着ていました。
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 noun fluˈɪd.ɪ.ti

fluidity

流動性
Meaning
The ability of a substance to flow easily; smooth and graceful movement or style.
Example
The fluidity of the dancer's movements was mesmerizing.
ダンサーの動きの流動性は魅惑的でした。
C1 noun flɛər

flair

才能
Meaning
A natural ability to do something well.
Example
She has a flair for design, always creating visually stunning work.
彼女はデザインに才能があり、常に視覚的に印象的な作品を作り出します。
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。
C1 noun /ˈfɔːrmən/

foreman

労働者のグループを担当する人、特に工場や建設現場で
Meaning
a person in charge of a group of workers, especially in a factory or construction site
Example
The foreman supervised the workers on the construction site.
フォアマンは建設現場で作業員を監督しました。
C1 noun /ˈfjuː.dʒə.tɪv/

Fugitive

逃亡者
Meaning
a person who has escaped from a place or is in hiding, especially to avoid arrest
Example
The police launched a manhunt to capture the fugitive who escaped from prison.
警察は刑務所から逃げた逃亡者を捕まえるために捜索を開始しました。
C1 noun /ˈfeɪvərɪtɪzəm/

favoritism

えこひいき
Meaning
the practice of giving unfair preferential treatment to one person or group
Example
The manager was accused of favoritism towards certain employees.
マネージャーは特定の従業員に対する偏愛で告発されました。
C1 adjective /ˈfɜːrtɪv/

furtive

ひそかな
Meaning
Attempting to avoid notice or attention, typically because of guilt or a belief that discovery would lead to trouble.
Example
He cast a furtive glance at the door before leaving.
彼は出発前にひそかにドアを見た。
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 /ˈfɛərˌɡraʊndz/

fairgrounds

見本市会場
Meaning
A designated area where fairs, exhibitions, and amusement events are held
Example
The town set up rides and stalls at the fairgrounds for the annual festival.
町は年次祭のために見本市会場に乗り物と屋台を設置した。
C1 noun /ˈflɔː.rə/

flora

特定の地域や生息地に見られる植物生命
Meaning
The plant life found in a particular region or habitat.
Example
The Amazon rainforest is home to a vast flora diversity.
アマゾンの熱帯雨林は豊かなフローラの多様性の家です。
C1 adjective /ˈfɔːrsəbl/

forcible

強制的
Meaning
Done by force; using physical strength or power.
Example
The police made a forcible entry into the house.
警察は強制的に家に入った。
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。
C1 adjective /frɔːt/

fraught

満ちた
Meaning
Filled with or likely to result in something undesirable.
Example
The negotiations were fraught with tension and uncertainty.
交渉は緊張と不確実性で満ちていました。
C1 verb /fɔːrˈseɪk/

forsake

Meaning
to abandon or give up something or someone
Example
He decided not to forsake his old friends despite his success.
C1 verb /ˈfɪdʒɪt/

fidget

そわそわする、落ち着かない
Meaning
to make small movements, especially because of nervousness or impatience
Example
The child began to fidget during the long lecture.
子供は長い講義中に落ち着かなくなり始めました。
C1 adjective /ˈfrɛn.zid/

frenzied

狂乱
Meaning
Wildly excited or uncontrolled
Example
The frenzied crowd cheered as the band took the stage.
狂乱の群衆は、バンドがステージに上がると歓声を上げました。
C1 verb /ˈfɔːrtɪˌfaɪ/

fortify

強化する
Meaning
To strengthen a place, person, or thing physically or mentally.
Example
They fortified the city walls to protect against invasion.
彼らは侵略に備えて街の壁を強化しました。
C1 adjective /ˈfræɡməntɪd/

fragmented

断片化, 分割, 不完全
Meaning
Having been broken into fragments; disjointed or incomplete.
Example
The information was fragmented and difficult to understand.
情報は断片化されていて、理解するのが難しかった。
C1 verb /flɪntʃ/

flinch

ひるむ
Meaning
to suddenly move back or away due to fear or pain
Example
He didn’t flinch when the doctor gave him the injection.
彼は医者が注射をする時、ひるむことはなかった。
C1 verb /ˈfɔːrfɪt/

forfeit

Meaning
to lose or give up something, usually as a penalty for wrongdoing
Example
He had to forfeit the match after breaking the rules.
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。
C1 adjective /ˈflæʃi/

flashy

派手な, 目立つ
Meaning
ostentatious or showy in a way that attracts attention
Example
He drove a flashy sports car through the city streets.
彼は市街地を派手なスポーツカーで走った。
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。
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。
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。
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。
C1 adjective ˈflʌd proʊn

flood-prone

洪水に見舞われやすい
Meaning
Susceptible to flooding; likely to experience floods frequently.
Example
Bangladesh is a flood-prone deltaic nation.
バングラデシュは洪水が発生しやすいデルタ国家です。
C1 noun /ˈfɔːr.teɪ/ or /fɔːrt/

forte

得意
Meaning
a strong ability or talent; something one does particularly well
Example
Cooking is definitely her forte.
料理は間違いなく彼女の得意分野です。
C1 adjective /ˈflɪmzi/

flimsy

弱々しい
Meaning
weak, fragile, or lacking in strength; not convincing
Example
The chair was too flimsy to support his weight.
その椅子は重さを支えられないほど弱々しかった。
C1 noun /fəˌsɪlɪˈteɪʃən/

facilitation

容易化
Meaning
The action of facilitating or making an action or process easier or helping bring about an outcome.
Example
Her facilitation made the meeting run smoothly.
彼女のファシリテーションにより、会議はスムーズに進行しました。
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。
C1 noun/adjective ˈflɛdʒ.lɪŋ

fledgling

未熟者, 経験不足, 新しく設立された
Meaning
New, inexperienced, newly established.
Example
The fledgling startup needs investment.
その新興企業は投資が必要です。
C1 noun /ˈfɔːrɡraʊnd/

foreground

前景
Meaning
the part of a scene that is nearest to and in front of the viewer
Example
The flowers in the foreground brightened the picture.
前景にある花が絵を明るくしました。
C1 noun /fruːˈɡæl.ə.ti/

frugality

倹約
Meaning
The quality of being economical in use or expenditure; not wasteful.
Example
Frugality is essential for saving money effectively.
倹約はお金を効果的に節約するために不可欠です。
C1 noun /flʌks/

flux

フロー
Meaning
continuous change or movement; the rate of flow of something
Example
The company was in a state of constant flux during the reorganization.
会社は再編成の間、絶え間ない変化の中にありました。
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。
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。
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。
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 /ˈfɔːrˌbɛər/

forebear

先祖
Meaning
An ancestor, especially one who lived a long time ago.
Example
He often speaks of his forebears with great respect.
彼はしばしば自分の先祖について尊敬を込めて話します。
C1 adjective /frəˈtɜːrnəl/

fraternal

Meaning
Relating to brothers or brotherhood; friendly and supportive.
Example
The two nations maintain a fraternal relationship.
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。
C1 noun /fɪˈnɑːleɪ/

finale

フィナーレ
Meaning
the last part or conclusion of a performance, event, or series
Example
The concert ended with a spectacular finale.
コンサートは壮観なフィナーレで終わりました。
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。
C1 noun /ˈfren.zi/

Frenzy

熱狂
Meaning
a state or period of uncontrolled excitement or wild behavior; intense activity
Example
The announcement of the sale created a shopping frenzy at the mall.
セールの発表はショッピングの熱狂を引き起こしました。
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。
C1 noun /ˈfjʊərɔːr/

furor

騒動
Meaning
An outbreak of public anger or excitement.
Example
The politician's remarks created a furor in the media.
政治家の発言がメディアで大騒ぎを引き起こしました。
C1 noun /fiˈæs.koʊ/

fiasco

完全な失敗
Meaning
a complete failure, especially a ludicrous or humiliating one
Example
The event turned into a complete fiasco due to poor planning.
計画の悪さからそのイベントは完全な失敗に終わった。
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。
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。
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。
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, adverb (informal, vulgar) /ˈfʌkɪŋ/

fucking

クソ (強調のための卑猥な言葉)
Meaning
used for emphasis, often expressing anger or frustration (vulgar slang)
Example
It was a fucking disaster!
それはクソみたいな災害だった！
C1 verb /fɔːrˈɡoʊ/

forego

断る
Meaning
to decide not to do or have something pleasant or valuable
Example
She decided to forego dessert to maintain her diet.
彼女はダイエットを維持するためにデザートを断ることに決めました。
C1 verb /ˈflaʊndər/

flounder

もがく
Meaning
To struggle or stagger clumsily; to experience difficulty or confusion.
Example
He floundered in the interview when asked difficult questions.
彼は面接で難しい質問をされて、うろたえました。
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.
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 /ˈfaɪ.naɪt/

Finite

有限な; 限界がある
Meaning
limited; having bounds or limits; not infinite
Example
Earth has finite natural resources.
地球には有限の自然資源があります。
C1 verb /fɔːrˈɡoʊ/

forgo

控える
Meaning
to decide not to do or have something
Example
She decided to forgo dessert to maintain her diet.
彼女はダイエットを維持するためにデザートを控えることを決めました。
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。
C1 adjective /fɪkˈtɪʃəs/

fictitious

虚構の、偽の
Meaning
not real or true; imaginary or fabricated
Example
The story he told was entirely fictitious.
彼が話した話は完全に虚構だった。
C1 adverb /ˈfeɪ.təl.i/

Fatally

致命的に
Meaning
in a way that causes death; with deadly consequences; critically
Example
The accident fatally injured two passengers.
事故は二人の乗客を致命的に負傷させた。
C1 adjective /ˈflæɡɪŋ/

flagging

疲れる、弱くなる、または熱意を失う
Meaning
becoming tired, weaker, or less enthusiastic
Example
After hours of work, his energy was flagging.
長時間働いた後、彼のエネルギーは衰えていた。
C1 noun /fɑːrs/

farce

茶番
Meaning
a comic dramatic work using buffoonery and horseplay, or a ridiculous situation
Example
The meeting turned into a complete farce with everyone arguing.
会議は完全に茶番に変わり、みんなが議論していた。
C1 verb /ˈfæbrɪkeɪt/

fabricate

作り上げる
Meaning
to invent or concoct something, often with the intent to deceive; or to construct or manufacture
Example
The witness fabricated his testimony to protect himself.
証人は自分を守るために証言をでっち上げました。
C1 noun /fruˈɪʃən/

fruition

実現
Meaning
The realization or fulfillment of a plan, project, or desire.
Example
Her dream of becoming a doctor finally came to fruition.
医者になるという彼女の夢はついに実現した。
C1 adjective /ˈfrɪdʒɪd/

Frigid

凍てつく; 寒い
Meaning
extremely cold; freezing; icy
Example
The frigid weather made it difficult to go outside.
冷たい天気で外に出るのが難しかった。
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。
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。
C1 adjective /ˈfleɪɡrənt/

flagrant

目立って明らかに間違っている
Meaning
shockingly noticeable or evident; glaringly wrong
Example
It was a flagrant violation of the rules.
それは規則の明らかな違反でした。
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。
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 /ˈfen.jʊ.griːk/

Fenugreek

フェヌグリーク
Meaning
an herb whose seeds and leaves are used as a spice in cooking
Example
Fenugreek seeds have a slightly bitter taste and are commonly used in Indian cuisine.
フェヌグリークの種は少し苦味があり、インディアン・カレーなどでよく使われます。
C1 verb /ˈfɔːlsɪfaɪ/

falsify

偽造する
Meaning
to make something false or to misrepresent
Example
He tried to falsify the documents to avoid taxes.
彼は税金を避けるために書類を偽造しようとした。
C1 noun /fəˈnætɪsɪzəm/

fanaticism

熱狂
Meaning
the quality of being fanatical; extreme zeal or obsession
Example
Religious fanaticism can lead to intolerance and conflict.
宗教的な熱狂は不寛容と対立を引き起こす可能性があります。
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。
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。
C1 adjective ˈfɔːr.mɪ.də.bəl

formidable

手ごわい
Meaning
Inspiring fear or respect through being impressively large, powerful, intense, or capable.
Example
The boxer was a formidable opponent in the ring.
そのボクサーはリングで手ごわい相手だった。
C1 noun /fɔːrˈmæl.ə.ti/

Formality

形式
Meaning
the rigid observance of rules of convention or etiquette; a thing done simply to comply with requirements
Example
The signing of the contract was just a formality; the deal was already agreed upon.
契約書にサインすることは単なる形式でした。契約はすでに合意されていました。
C1 adjective ˈfjuː.taɪl

futile

無駄な
Meaning
Incapable of producing any useful result; pointless.
Example
His attempts to change the situation were futile.
状況を変えるための彼の試みは無駄だった。
C1 adjective /ˌfʊl ˈbɒd.id/

full-bodied

濃厚な味わい
Meaning
Having a strong, rich, and robust quality, especially of wine, coffee, or voice.
Example
He prefers a full-bodied red wine with his dinner.
彼は夕食に濃厚な味わいの赤ワインを好みます。
C1 noun, verb /fɔːrd/

ford

浅瀬
Meaning
A shallow place in a river where one can cross; to cross a river at such a place.
Example
The travelers decided to ford the river at dawn.
旅行者たちは夜明けに川を渡ることに決めました。
C1 noun, verb /ˈfɜːrloʊ/

furlough

一時休職
Meaning
temporary leave of absence from work, especially that granted to an employee or soldier
Example
Many workers were placed on furlough during the crisis.
多くの労働者は危機の間に休職させられました。
C1 noun /ˈfæm.ɪn/

Famine

飢饉
Meaning
extreme scarcity of food; a period when food is extremely scarce
Example
The severe drought led to widespread famine in the region.
厳しい干ばつが地域で広範な飢饉を引き起こしました。
C1 adjective /ˈfruːt.ləs/

Fruitless

無駄な; 実を結ばない; 無益な;
Meaning
unsuccessful; futile; pointless;
Example
After hours of searching, their efforts proved fruitless.
数時間の探索の後、彼らの努力は無駄であることが証明されました。
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 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 ˌflʌk.tʃuˈeɪ.ʃən

fluctuation

変動
Meaning
An irregular rising and falling in number or amount; a variation.
Example
The stock market experiences frequent fluctuation.
株式市場は頻繁に変動します。
C1 adverb /ˈfɪksɪdli/

Fixedly

固定的に
Meaning
in a steady, unmoving manner; with intense concentration
Example
He stared fixedly at the painting.
彼は絵を固定的に見つめていた。
C1 noun /ˈfɔːls.hʊd/

Falsehood

虚偽; 嘘
Meaning
the state of being untrue; a lie
Example
The politician was caught spreading falsehoods about his opponent.
その政治家は対立候補について虚偽を広めているところを見つかった。
C1 adverb /ˈfɜː.vənt.li/

Fervently

熱心に; 熱烈に;
Meaning
with passionate intensity; ardently; with great emotion or enthusiasm
Example
She fervently hoped that her dreams would come true.
彼女は自分の夢が実現することを熱心に願っていました。
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。
C1 verb /ˈfɜːr.tɪ.laɪz/

fertilize

肥料を施す
Meaning
to make soil or land more fertile by adding substances
Example
Farmers fertilize the fields to increase crop yield.
農家は作物の収穫量を増やすために畑に肥料を施す。
C1 adjective /ˈfrɔːdjʊlənt/

fraudulent

詐欺的な
Meaning
Involving or using deceit, especially criminal deception.
Example
He was arrested for making fraudulent insurance claims.
彼は詐欺的な保険金請求を行ったため逮捕されました。
C1 adjective /ˈfɔːrθˌraɪt/

forthright

率直
Meaning
Direct and honest in speech or behavior; straightforward.
Example
She was forthright in her criticism of the policy.
彼女は政策に対する批判で率直だった。