Fuel
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B1 noun /ˈfjuː.əl/

Fuel

燃料
Meaning
a material such as coal, gas, or oil that is burned to produce heat or power
Example
The rising cost of fuel has affected transportation and heating expenses worldwide.
燃料の価格上昇は、世界中の輸送と暖房費に影響を与えました。
A2 noun /ˈfiːtʃər/

feature

特徴
Meaning
a distinctive attribute or aspect of something; a characteristic
Example
The new phone has a unique camera feature.
新しい電話にはユニークなカメラの特徴があります。
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。
C2 adjective /ˈfʌsti/

fusty

かび臭い、古臭い
Meaning
smelling stale, damp, or stuffy; old-fashioned
Example
The room smelled fusty after being closed for months.
部屋は数ヶ月間閉め切られていた後、かび臭くなった。
B2 adjective /ˈflɔː.ləs/

Flawless

完璧な; 欠陥なし
Meaning
perfect; without any defects or faults; immaculate
Example
Her flawless performance earned her a standing ovation.
彼女の完璧なパフォーマンスは、スタンディングオベーションを得た。
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。
A1 verb /fiːl/

Feel

感じる; 経験する; 触れる
Meaning
to experience an emotion or physical sensation; to touch something
Example
I feel happy when I see my friends.
友達を見ると、私は幸せを感じます。
C2 noun /flæks/

flax

フラックス
Meaning
a plant whose fibers are used to make linen and whose seeds are edible
Example
Flax is often used in making linen fabrics.
フラックスは、リネン生地を作るために頻繁に使用されます。
C1 noun /ˈfjuː.də.lɪ.zəm/

feudalism

封建制度
Meaning
the social system in medieval Europe in which people worked and fought for nobles who gave them protection and land in return
Example
Feudalism shaped the political structure of medieval Europe.
封建制度は中世ヨーロッパの政治構造を形作った。
C2 noun /ˈflɛdʒlɪŋ/

fledgeling

若鳥
Meaning
A young bird that has just developed its feathers and is learning to fly; a beginner.
Example
The fledgeling was trying hard to take its first flight.
若鳥は最初の飛行をしようとしていました。
C1 noun /ˈfɔːrsəm/

foursome

四人組
Meaning
a group of four people or things, especially in games or social activities
Example
The foursome enjoyed a game of golf together.
四人組は一緒にゴルフを楽しみました。
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。
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 adjective /fɔːls/

False

偽; 不正確; 欺瞞; 人工
Meaning
not true; incorrect; deceptive; artificial
Example
The witness gave false testimony in court.
証人は法廷で偽証をした。
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。
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！
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 /ˈfæð.əm.ləs/

fathomless

理解不可能な、または測定不可能な; 非常に深い
Meaning
impossible to understand or measure; very deep
Example
The ocean seemed fathomless as it stretched to the horizon.
海は地平線まで広がると、測り知れないように見えました。
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。
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。
B1 adjective /feɪld/

failed

失敗した
Meaning
not successful in achieving a desired result
Example
The project failed to meet the expectations.
プロジェクトは期待に応えることができませんでした。
A2 noun/verb /fɛns/

fence

フェンス
Meaning
a barrier, usually made of wood or wire, that surrounds an area; to enclose with a barrier
Example
They built a fence around the garden.
彼らは庭の周りにフェンスを作った。
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。
A1 noun ˈflaʊərz

Flowers

花
Meaning
The reproductive structures of plants that provide nectar for butterflies.
Example
Butterflies are attracted to colorful flowers.
蝶々は色とりどりの花に引き寄せられる。
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。
B2 noun /fleʃ/

Flesh

肉体
Meaning
the soft substance consisting of muscle and fat that is found between the skin and bones
Example
The doctor examined the wound to check if it had penetrated the flesh.
医師は傷口を調べて、それが肉体に達しているかどうか確認しました
B2 adverb /ˈfɔːrməli/

formally

正式に
Meaning
in a formal or official manner; according to established rules or conventions
Example
The agreement was formally signed by both parties.
その合意は両当事者によって正式に署名された。
C2 verb /ˈfɒn.dəl/

fondle

撫でる
Meaning
To stroke or caress lovingly or gently.
Example
She fondled the kitten gently in her lap.
彼女は膝の上で子猫を優しく撫でていました。
C2 verb /fɪˈneɪɡəl/

finagle

巧妙さや騙しで物を得る
Meaning
to obtain something by cleverness or trickery
Example
He finagled a free ticket by pretending to be a VIP guest.
彼はVIPゲストだと偽って無料チケットを手に入れた。
C1 adjective/noun /fəˈrɛns.ɪk/

forensic

犯罪や法的問題に適用される科学的分析
Meaning
Scientific analysis applied to criminal or legal matters
Example
Forensic experts analyze cybercrimes using advanced tools.
法医学の専門家は、先進的なツールを使用してサイバー犯罪を分析します。
C2 verb /fleɪ/

flay

皮を剥ぐ/厳しく批判する
Meaning
to strip off the skin of something or criticize severely
Example
The chef flayed the fish before cooking it.
シェフは魚を料理する前に皮を剥ぎました。
B2 noun /ˈfɜːrneɪs/

furnace

炉
Meaning
an enclosed structure in which heat is produced for a building or for melting metal
Example
The factory's furnace melted the metal quickly.
工場の炉は金属を迅速に溶かしました。
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。
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。
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。
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。
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。
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。
A2 noun /ˈfɑː.loʊ.ɪŋ/

following

フォロワー
Meaning
a group of supporters or people who admire something or someone
Example
The singer has a large following around the world.
その歌手は世界中に多くのフォロワーを持っています。
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。
C2 verb /fleɪl/

flail

何かを激しく振る; 必死に動く
Meaning
to wave or swing something about wildly; to thrash about
Example
He flailed his arms to keep afloat in the water.
彼は水に浮かぶために腕を振った。
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。
C2 noun /frɒnd/

frond

葉
Meaning
A large, divided leaf of a fern, palm, or similar plant.
Example
The fern's frond stretched gracefully over the garden path.
シダの葉は庭の小道を優雅に伸びました。
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。
A1 noun ˈfjuː.tʃər

future

未来
Meaning
The time or a period of time following the moment of speaking or writing; time regarded as still to come.
Example
Future projects depend on strategic planning.
未来のプロジェクトは戦略的な計画に依存しています。
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。
B1 noun freɪm

Frame

額縁
Meaning
A rigid structure that surrounds something such as a picture, door, or windowpane.
Example
A framed family tree can be displayed in your home.
額縁に入れた家系図は家で展示できます。
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。
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。
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。
C2 noun /ˈfetiʃ/

fetich

フェティッシュ
Meaning
an object believed to have magical powers or to be inhabited by a spirit
Example
The villagers treated the statue as a powerful fetich.
村人たちはその像を強力なフェティッシュとして扱っていました。
C2 noun /fəˈlɪsɪti/

felicity

幸福
Meaning
intense happiness; the ability to find appropriate expression for one's thoughts
Example
She was known for her felicity in conversation and cheerful nature.
彼女は会話の中での幸福と明るい性格で知られていました。
C1 verb, noun /ˈflʌstər/

fluster

困惑させる
Meaning
to make someone agitated or confused
Example
The unexpected question flustered him.
予期しない質問が彼を困惑させた。
C2 adjective /ˈflæb.i/

Flabby

柔らかくてだらしない; しっかり感や筋肉の張りがない; 弱い
Meaning
soft and loose; lacking firmness or muscle tone; weak
Example
His flabby arms showed he needed to exercise more.
彼のだらしない腕は、もっと運動する必要があることを示していました。
B2 noun /ˈfaɪ.bər/

fibre

繊維
Meaning
A thread or filament from which a vegetable tissue, mineral substance, or textile is formed; dietary material that aids digestion.
Example
Eating foods rich in fibre can improve your digestion.
食物繊維が豊富な食べ物を食べると消化が良くなります。
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。
B1 noun /ˈfaɪn.dɪŋ/

finding

発見、調査後に得られた結論または結果
Meaning
a discovery, conclusion, or result reached after investigation
Example
The scientist published her findings in a leading journal.
科学者は彼女の発見を主要なジャーナルに発表しました。
C2 noun, verb /ˈfɪlɪˌbʌstər/

filibuster

議会での活動を長時間の演説で遅らせる戦術; この戦術を使用する
Meaning
a tactic of delaying legislative action by prolonged speech; to use such a tactic
Example
The senator filibustered for hours to prevent the bill from passing.
上院議員は法案を通すのを防ぐために何時間もフィリバスターを行った。
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。
C2 noun /ˈfɔɪbəl/

foible

小さな弱点
Meaning
A minor weakness or eccentricity in someone's character.
Example
She loved him despite his little foibles.
彼女は彼の小さな弱点を気にせずに彼を愛していた。
B2 adjective /ˈfes.tɪv/

Festive

お祭りのような; 楽しい; セレブレーション
Meaning
joyful; celebratory; having the characteristics of a festival
Example
The house looked festive with colorful decorations.
家はカラフルな飾り付けでお祭り気分だった。
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。
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。
B2 noun /ˈfrʌn.tɪər/

frontier

境界または新しい分野
Meaning
A new area of activity, knowledge, or development; the edge of knowledge or achievement.
Example
Robotic surgery is exploring a new frontier in medicine.
ロボット手術は医学の新しいフロンティアを探求しています。
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。
A2 noun /ˈfɜːrnɪtʃər/

furniture

家具
Meaning
Objects such as chairs, tables, beds, or cupboards used to make a room suitable for living or working.
Example
The living room was filled with beautiful wooden furniture.
リビングルームは美しい木製の家具でいっぱいでした。
C2 noun /ˈfɜːrðərəns/

furtherance

促進
Meaning
The advancement or promotion of something.
Example
The new policy was introduced in furtherance of social justice.
新しい政策は社会的正義の促進のために導入されました。
C2 verb /ˈfɜːrbɪʃ/

furbish

磨く
Meaning
to polish, renovate, or give a fresh look to something
Example
The workers furbished the old sword until it gleamed like new.
作業員たちは古い剣を磨き、それが新しいかのように輝くまでしました。
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。
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。
C2 verb /frɪsk/

frisk

ボディチェックする
Meaning
To search a person by patting their clothing to check for concealed items.
Example
The security guard frisked the man at the entrance.
セキュリティガードは入口でその男性をフリスクしました。
C2 adjective /ˈfʌndʒəbl/

fungible

代替可能な
Meaning
interchangeable; able to replace or be replaced by another identical item
Example
In finance, money is considered a fungible asset.
金融業界では、貨幣は代替可能な資産と見なされています。
C1 noun ˌfræɡ.mənˈteɪ.ʃən

fragmentation

フラグメンテーション
Meaning
The process or state of breaking or being broken into fragments.
Example
Habitat fragmentation threatens many species.
生息地のフラグメンテーションは多くの種に脅威を与えています。
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。
A2 verb /feɪl/

fail

失敗する
Meaning
to not succeed in achieving something; to be unsuccessful
Example
He failed to complete the assignment on time.
彼は時間通りに課題を完了することに失敗した。
C1 noun/verb ˈfɒr.ɪdʒ

forage

飼料、食べ物を探す
Meaning
Food for horses and cattle, especially dried hay or feed; to search for food.
Example
Animals forage for food during the winter months.
動物たちは冬の間に食べ物を探します。
C2 noun /ˈflætʃələns/

flatulence

消化器系のガスの蓄積
Meaning
the accumulation of gas in the digestive system; excessive gas in the stomach or intestines
Example
Eating beans can sometimes cause flatulence.
豆を食べると時々おならが出ることがあります。
B2 noun /ˈfɔːrəm/

forum

フォーラム
Meaning
A place, meeting, or medium where ideas and views can be exchanged.
Example
The online forum allows people to discuss a wide range of topics.
オンラインフォーラムでは、人々がさまざまなトピックについて議論することができます。
B2 verb /ˈfrʌsˌtreɪt/

frustrate

フラストレートする
Meaning
to prevent from accomplishing; to make someone feel annoyed
Example
The traffic jam frustrated all the commuters.
渋滞はすべての通勤者をフラストレートさせました。
C1 verb /fɔrˈstɔl/

forestall

事前に防ぐ
Meaning
to prevent by acting in advance; to anticipate and counter
Example
They forestalled the crisis by taking immediate action.
彼らは即座に行動することで危機を回避した。
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。
C2 adjective /ˈfæləbl/

fallible

誤りを犯しやすい
Meaning
capable of making mistakes or being wrong
Example
Even experts are fallible and can make errors.
専門家でさえ、誤りを犯し、エラーをすることがあります。
A1 preposition /fɔːr/

for

のために
Meaning
used to indicate purpose, destination, or recipient
Example
This gift is for you.
このギフトはあなたのためです。
C2 adjective/noun /fɪˈduː.ʃi.er.i/

fiduciary

信託の
Meaning
Involving trust, especially with regard to the relationship between a trustee and a beneficiary.
Example
Banks have fiduciary duties towards their clients.
銀行は顧客に対して信託義務を負っています。
B2 noun /fraɪt/

Fright

恐怖; 驚き; 驚愕
Meaning
a sudden intense feeling of fear; a shock or surprise that causes fear
Example
The loud thunder gave her such a fright that she dropped her coffee cup.
大きな雷の音で、彼女は恐怖を感じてコーヒーカップを落としました。
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。
B2 adverb /fɔːrθ/

forth

前へ
Meaning
forward in place, time, or order
Example
The leader stepped forth to address the crowd.
リーダーは群衆に向かって前に出ました。
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 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 /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。
A2 adjective /fɪt/

Fit

適切な; 健康な; 良い体調の; 準備ができている
Meaning
suitable; appropriate; healthy; in good physical condition; ready
Example
He is fit and healthy.
彼はフィットで健康です。
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 /ˈfʊl.krəm/

fulcrum

支点
Meaning
The point or support on which a lever pivots; a central or essential point of activity or support.
Example
The teacher became the fulcrum of change in the school.
教師は学校の変革の支点となった。
C2 noun /ˌfrɪdʒɪˈdɛːriəm/

frigidarium

冷水浴場
Meaning
a large cold pool in ancient Roman baths used for cooling off after hot baths
Example
The ruins of the Roman frigidarium are still visible today.
ローマのフリジダリウムの遺跡は今日でも見ることができます。
C2 noun /ˈfɔːrˌseɪl/

foresail

フォアセイル
Meaning
The principal sail set on the foremast of a sailing vessel.
Example
The crew adjusted the foresail to catch the wind.
乗組員は風を捉えるためにフォアセイルを調整しました。
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。
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 noun /ˈfrɔːdjʊləns/

fraudulence

詐欺
Meaning
The quality or state of being fraudulent; deceitfulness.
Example
The audit revealed fraudulence in the financial statements.
監査は財務諸表における詐欺を明らかにしました。
C2 verb /ˈfrʌktɪˌfaɪ/

fructify

実らせる
Meaning
To make fruitful or productive; to bear fruit.
Example
The new policies will help fructify the economic potential of the region.
新しい政策は地域の経済的な潜在能力を実らせるのに役立ちます。
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。
C2 noun /ˈfjʊr.ʌŋ.kəl/

Furuncle

ふるんくる; こぶ;
Meaning
a painful pus-filled bump under the skin caused by infected, inflamed hair follicles
Example
The doctor prescribed antibiotics to treat the painful furuncle on his neck.
医者は彼の首の痛みを伴うフルンクルを治療するために抗生物質を処方しました。
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。
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 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 noun /ˈfɔːr.tɪ.tjuːd/

fortitude

不屈
Meaning
Courage in pain or adversity; mental and emotional strength in facing difficulty.
Example
She faced adversity with great fortitude.
彼女は困難に立ち向かう強い意志を持っていました。
B2 noun /ˈfaʊn.dər/

Founder

創設者
Meaning
a person who establishes an institution or settlement; someone who starts or creates something
Example
Steve Jobs was the co-founder of Apple Inc. and revolutionized personal computing.
スティーブ・ジョブズはApple Inc.の共同創設者で、個人用コンピュータを革新しました。
A2 noun /fraɪd raɪs/

Fried rice

チャーハン
Meaning
a dish of cooked rice that has been stir-fried in a wok or frying pan
Example
We ordered chicken fried rice from the Chinese restaurant.
私たちは中国料理店からチキンフライドライスを注文しました。
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。
C2 verb /foʊˈmɛnt/

foment

扇動する
Meaning
To instigate or stir up (an undesirable or violent sentiment or course of action).
Example
The rebel leader tried to foment unrest among the people.
反乱の指導者は、人々の間で騒動を煽ろうとした。
B1 adjective /ˈfrʌstreɪtɪŋ/

frustrating

苛立たしい
Meaning
causing annoyance or dissatisfaction
Example
The slow internet connection was really frustrating.
遅いインターネット接続は本当に苛立たしかった。
C2 adjective /ˈfɒp.ɪʃ/

Foppish

自分の外見や服に過剰にこだわる; 服装にうぬぼれがある
Meaning
excessively concerned with one's appearance and clothes; vain about dress
Example
His foppish behavior and expensive clothes made him stand out.
彼のフォピッシュな態度と高価な服は彼を目立たせました。
B1 noun /fɒɡ/

Fog

霧
Meaning
a thick cloud of tiny water droplets suspended in the atmosphere at or near the earth's surface that reduces visibility
Example
Dense fog covered the highway this morning.
今朝、濃霧が高速道路を覆いました。
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 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 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。
B2 verb /fʊlˈfɪl/

fulfill

実現する
Meaning
to complete or accomplish something, especially a task or promise
Example
He worked hard to fulfill his dreams.
彼は夢を実現するために一生懸命働きました。
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。
C1 adjective /frəˈtɜːrnəl/

fraternal

Meaning
Relating to brothers or brotherhood; friendly and supportive.
Example
The two nations maintain a fraternal relationship.
C2 verb /ˌfɔːrˈrʌn/

forerun

先駆ける
Meaning
To go before; to precede in time, place, or action.
Example
Dark clouds often forerun a storm.
暗い雲はしばしば嵐の前触れとなる。
C2 adjective /ˈfrɒθi/

frothy

泡立てた
Meaning
Full of or covered with small bubbles; light and insubstantial.
Example
She ordered a cup of frothy cappuccino.
彼女は泡立てたカプチーノを注文しました。