Flawless
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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。
B2 verb /ˈflætər/

flatter

過度または不誠実にお世辞を言って、恩恵を得る
Meaning
to praise excessively or insincerely to gain favor
Example
He tried to flatter his boss to get a promotion.
彼は昇進を得るために上司をお世辞で持ち上げようとした。
C2 noun /ˈflæt.ər.ər/

Flatterer

お世辞を言う人
Meaning
a person who lavishes praise, often insincerely and in order to gain advantage
Example
The king was surrounded by flatterers who only told him what he wanted to hear.
王様はお世辞を言う人たちに囲まれて、彼が聞きたいことだけを言ってもらった。
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。
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。
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 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 /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。
B2 verb ˈfɔːr.mjə.leɪt

formulate

策定する
Meaning
To create or develop a plan or idea clearly and specifically, to construct an idea or strategy clearly.
Example
The company must formulate a strategy for expansion.
会社は拡張戦略を策定する必要があります。
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。
A2 adjective, noun /ˈfeɪvərɪt/

favorite

お気に入り
Meaning
Preferred over all others; something or someone especially liked.
Example
Chocolate is my favorite ice cream flavor.
チョコレートは私のお気に入りのアイスクリームのフレーバーです。
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。
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。
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。
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 /ˈfɔːrʃɔːr/

foreshore

海岸
Meaning
The part of the shore between the high and low tide marks
Example
Children were playing on the foreshore, collecting shells.
子供たちは海岸で遊んでいて、貝殻を集めていました。
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。
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。
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。
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。
C1 adjective + noun ˈfeɪvərəbəl klaɪˈmætɪk kənˈdɪʃənz

favorable climatic conditions

好ましい気候条件
Meaning
Weather conditions that are suitable and beneficial for growth or development
Example
Winter offers favorable climatic conditions for farming.
冬は農業にとって好ましい気候条件を提供します。
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。
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。
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。
A2 noun /flaɪt/

flight

フライト / フライト
Meaning
the act of flying, typically through the air; or a scheduled trip by an aircraft
Example
Our flight to London was delayed due to bad weather.
ロンドン行きのフライトは悪天候のため遅れました。
C1 verb /flɔːnt/

flaunt

誇示する
Meaning
to show off something proudly, often to attract attention
Example
She likes to flaunt her new jewelry at parties.
彼女はパーティーで新しいジュエリーを誇示するのが好きです。
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。
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。
B2 noun /faʊl/

Fowl

家禽
Meaning
a domesticated bird kept for meat or eggs; chicken or other poultry
Example
The farmer raised fowl in his backyard for fresh eggs and meat.
農場主は新鮮な卵と肉のために庭で家禽を育てていました。
A2 adjective /ˈfraɪtənd/

frightened

怯えた
Meaning
feeling fear or anxiety; scared
Example
The child was frightened by the loud noise.
その子供は大きな音に怯えた。
B1 noun /ˈfiːdbæk/

feedback

フィードバック
Meaning
information or opinions about how well someone is doing something
Example
She asked her teacher for feedback on her essay.
彼女はエッセイについて先生にフィードバックを求めました。
B2 noun /frɒk/

Frock

ワンピース
Meaning
a dress, especially a simple or casual one for women or children
Example
The little girl wore a pink frock to her birthday party.
小さな女の子は誕生日パーティーにピンクのワンピースを着て行きました。
C1 noun /ˈfɒdər/

fodder

飼料
Meaning
food for livestock such as cattle, horses, or sheep; also something considered of little value but used to supply a demand
Example
The farmer stored enough fodder for the cattle to last through winter.
農家は家畜が冬を越せるように十分な飼料を貯めておいた。
B2 noun /ˈfɔːr.kæst/

Forecast

天気予報
Meaning
a prediction or estimate of future events, especially coming weather conditions
Example
The weather forecast predicted heavy rain for the entire weekend.
天気予報は週末全体で大雨を予測しました。
B2 adjective /ˈfɜːr.taɪl/

Fertile

肥沃な
Meaning
capable of producing abundant vegetation or crops; able to conceive children
Example
The fertile soil in this region makes it perfect for growing vegetables.
この地域の肥沃な土壌は、野菜を育てるのに最適です。
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。
C1 adjective /ˈfɑːð.ər.ləs/

fatherless

父親がいない
Meaning
without a father
Example
The fatherless child relied on the support of his community.
その父親がいない子供は、コミュニティの支援に頼っていました。
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。
A2 adjective /faɪn/

Fine

良い; 素晴らしい; 薄い; 繊細な; 高品質な
Meaning
good; excellent; thin; delicate; high quality
Example
The weather is fine today.
今日は天気が良いです。
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 adjective /ˈfrɛtfəl/

fretful

不安な
Meaning
Feeling or showing distress or irritation.
Example
The baby was fretful all night and could not sleep.
赤ちゃんは一晩中不安で眠れませんでした。
A1 adjective /fɜːrst/

first

最初
Meaning
coming before all others in time, order, or importance
Example
She was the first to arrive at the meeting.
彼女は会議に最初に到着した。
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。
B2 noun /foʊm/

Foam

泡
Meaning
a mass of small bubbles formed on or in liquid; frothy white mass
Example
The waves crashed against the rocks, creating white foam on the shore.
波が岩にぶつかり、浜辺に白い泡を作った。
B1 noun /fiː/

fee

料金
Meaning
A payment made for a service or privilege.
Example
The lawyer charged a high fee for his services.
弁護士は彼のサービスに高い料金を請求した。
B2 verb /ˈfɜːrnɪʃ/

furnish

家具を設置する、提供する
Meaning
to provide or supply with furniture or equipment
Example
They furnished the new house with modern furniture.
彼らは新しい家に現代的な家具を備えました。
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。
B2 noun /ˈfɔːrmjələ/

formula

公式
Meaning
a fixed method for doing something; a mathematical or chemical rule expressed in symbols
Example
The scientist discovered a new formula for the medicine.
科学者は新しい薬の公式を発見しました。
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。
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。
B1 noun /ˈfes.tə.vəl/

Festival

フェスティバル; 祭り;
Meaning
a day or period of celebration, typically for religious reasons; an organized series of concerts, films, etc.
Example
The music festival attracted thousands of visitors from around the world.
音楽フェスティバルは世界中から何千人もの観客を魅了しました。
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。
B2 verb /flɪp/

flip

ひっくり返す
Meaning
to turn over quickly or suddenly; to toss lightly
Example
She flipped the pancake in the pan.
彼女はパンケーキをフライパンでひっくり返した。
B1 noun fləʊ

flow

流れ
Meaning
The action or fact of moving along in a steady, continuous stream
Example
The flow of information must be secured.
情報の流れは確保されなければならない。
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。
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 noun /ˈfɪʃˌmʌŋ.ɡər/

fishmonger

魚屋
Meaning
a person or store that sells fish
Example
I bought fresh salmon from the local fishmonger.
私は地元の魚屋で新鮮なサーモンを買いました。
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。
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。
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。
B1 adverb /ˈfeər.li/

Fairly

公正に; 適度に; 合理的に
Meaning
in a just manner; moderately; reasonably
Example
The test was fairly easy, but some questions were challenging.
テストはかなり簡単でしたが、いくつかの質問は挑戦的でした。
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。
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。
C2 adjective /fluːˈɛnʃəl/

fluential

影響力のある
Meaning
Having the power to influence or flowing freely (rare/archaic usage).
Example
The fluential speaker captivated the entire audience.
影響力のある話者は、観客全体を魅了しました。
B2 noun /ˈfer.i boʊt/

Ferry-boat

フェリー
Meaning
a boat that carries passengers and vehicles across water
Example
We took the ferry-boat to cross the river.
私たちは川を渡るためにフェリー・ボートに乗りました。
C1 noun /ˈfoʊ.kəs ˈtræk.ɪŋ/

focus tracking

フォーカス追跡
Meaning
A technique of monitoring and maintaining attention on specific tasks or goals.
Example
Proper focus tracking improves productivity.
適切なフォーカス追跡は生産性を向上させます。
A1 noun /fuːd/

food

食べ物
Meaning
any nutritious substance that people or animals eat or drink to maintain life and growth
Example
Rice is a common food in Asia.
ご飯はアジアでは一般的な食べ物です。
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。
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。
A2 noun fɔːrs

force

力
Meaning
A physical power or energy that can cause movement, change, or influence.
Example
Strong nuclear force binds particles.
強い核力が粒子を結びつける。
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。
B2 adjective /fræŋk/

Frank

正直な; 開かれた; 率直な; 誠実な
Meaning
honest; open; straightforward; candid
Example
She gave me a frank opinion about my presentation.
彼女は私のプレゼンテーションについて率直な意見をくれました。
A2 noun /fɔːrk/

Fork

フォーク
Meaning
a tool with two or more prongs used for eating or serving food
Example
Please use a fork to eat your salad.
サラダを食べるためにフォークを使ってください。
C1 verb /fɔːrˈkloʊz/

foreclose

差し押さえる
Meaning
to take possession of a property due to the owner's failure to keep up mortgage payments
Example
The bank decided to foreclose on the property after months of missed payments.
銀行は何ヶ月も支払いを欠かした後、物件の差し押さえを決定しました。
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。
A1 adjective /fʊl/

full

満杯
Meaning
Containing as much or as many as possible; complete.
Example
The glass is full of water.
グラスは水で満杯です。
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。
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。
C2 adjective /ˈfiːtɪd/

foetid

腐った
Meaning
having an offensive, unpleasant smell
Example
The foetid smell from the garbage made it hard to breathe.
ゴミからの腐った臭いで呼吸が困難になった。
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 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。
C2 verb /flɪt/

flit

ひらひら舞う
Meaning
to move quickly and lightly from one place to another
Example
Butterflies flitted from flower to flower.
蝶が花から花へひらひらと舞った。
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 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。
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。
C2 adjective /ˈfʊtˌluːs/

footloose

自由な
Meaning
Free to go anywhere or do anything; not tied down by responsibilities.
Example
After graduating, he felt footloose and ready to explore the world.
卒業後、彼は自由を感じ、世界を探索する準備ができていました。
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。
B2 verb, adjective /ˈfɒstər/

foster

育てる
Meaning
to encourage the development of something; to raise a child that is not one's own
Example
The program aims to foster creativity in young students.
そのプログラムは若い学生たちに創造力を促進することを目的としています。
B2 adverb /ˌfʌndəˈmɛntəli/

fundamentally

基本的に
Meaning
in a basic and important way; at the core
Example
The two theories are fundamentally different.
この二つの理論は基本的に異なります。
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。
C2 noun /feɪt/

fete

祭り、フェスティバル
Meaning
a celebration or festival, often in honor of someone
Example
The village held a grand fete to celebrate the harvest.
村は収穫を祝うために盛大な祭りを開催しました。
B2 adverb /ˈfɜ:rmli/

Firmly

しっかりと
Meaning
in a strong, steady, and unwavering manner
Example
She firmly believed in her decision.
彼女は自分の決定に固く信じていた。
A2 noun ˈfɔːrɪsts

Forests

森
Meaning
Large areas covered with trees and undergrowth, providing natural habitats for wildlife.
Example
Forests provide shelter and food for butterflies.
森は蝶々にとって避難所と食料を提供します。
C1 adjective /ˈfɜːr.vənt/

fervent

情熱的な、熱心な
Meaning
having or showing intense passion or enthusiasm
Example
She gave a fervent speech about climate change.
彼女は気候変動について情熱的なスピーチを行った。
C2 adjective /ˈfɔːnɪŋ/

fawning

過度のほめ言葉
Meaning
displaying exaggerated flattery or affection
Example
Her fawning compliments made everyone uncomfortable.
彼女の過度のほめ言葉は、皆を不快にさせました。
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。
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。
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。
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。
A2 adjective /ˈfɔːrməl/

formal

正式
Meaning
done in accordance with rules of convention or etiquette; official or serious in nature
Example
He wore a formal suit to the wedding.
彼は結婚式でフォーマルなスーツを着ていました。
C1 noun ˈfɔː.saɪt

foresight

先見の明
Meaning
The ability to predict or the action of predicting what will happen or be needed in the future.
Example
His foresight helped the company avoid financial losses.
彼の先見の明は会社が財政的損失を避けるのに役立った。
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。
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。
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 adjective /ˈfræk.ʃəs/

Fractious

わがままな; けんか腰の; 手に負えない
Meaning
irritable and quarrelsome; difficult to control; bad-tempered
Example
The fractious child refused to follow any of the teacher's instructions.
その気難しい子供は教師の指示に従うことを拒否しました。
B2 adjective /ˈfɔːlti/

faulty

欠陥のある
Meaning
Having defects or imperfections; not working properly
Example
The device stopped working because it was faulty.
その装置は欠陥のあるため動作を停止しました。
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。
B2 noun /ˈfleɪvər/

flavor

味
Meaning
The distinctive taste of a food or drink.
Example
This ice cream has a delicious mango flavor.
このアイスクリームはおいしいマンゴーのフレーバーがあります。
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。
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。
A2 adjective /ˈfaɪ.nəl/

Final

最終的な; 決定的な; 最後の
Meaning
last; concluding; decisive; ultimate
Example
This is the final exam of the semester.
これは学期の最終試験です。
C1 noun /fɪˈdɛl.ɪ.ti/

fidelity

忠誠心
Meaning
Faithfulness to a person, cause, or belief, demonstrated by continuing loyalty and support.
Example
A dog's fidelity to its owner is unmatched.
犬の忠誠心はその飼い主に対して比類のないものです。
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 adjective /ˈfʊl.səm/

fulsome

過剰な賞賛
Meaning
Excessively flattering or insincere; abundant or generous in amount.
Example
He offered fulsome praise to his boss.
彼は上司に過剰な賞賛を提供しました。
B2 noun fəˈtiːɡ

fatigue

疲労
Meaning
Physical or mental exhaustion due to prolonged exertion or mental stress
Example
Lack of sleep leads to extreme fatigue.
睡眠不足は極度の疲労を引き起こします。
C2 noun /ˈfrɛʃɪt/

freshet

突然の川の氾濫
Meaning
A sudden overflow of a stream or river caused by heavy rain or melting snow.
Example
After the storm, the river turned into a raging freshet.
嵐の後、川は激しいフレシェットに変わった。
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 adverb, adjective, verb, noun /ˈfɔːrwərd/

forward

前進
Meaning
toward the front; to advance or send ahead; an onward position or direction
Example
The troops moved forward to secure the bridge.
部隊は橋を確保するために前進しました。
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。
C2 noun /ˈfʌŋkʃəˌnɛri/

functionary

職員
Meaning
a person who has official duties in an organization, especially one with little authority
Example
The minor functionary was responsible for filing reports.
その下級職員はレポートの提出を担当していました。
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。