ferrous
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C2 adjective /ˈfer.əs/

ferrous

鉄を含む
Meaning
containing or consisting of iron
Example
Ferrous metals are commonly used in construction.
鉄を含む金属は建設でよく使用されます。
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 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。
A1 preposition /frəm/ or /frʌm/

from

から
Meaning
Used to indicate the starting point of a journey, action, or source.
Example
She came from Dhaka to visit her family.
彼女はダッカから家族を訪ねて来ました。
B2 noun ˈfjuː.tʃɚ ˌdʒen.əˈreɪ.ʃənz

future generations

未来の世代
Meaning
People who have not yet been born, considered in terms of the environment or society they will inherit.
Example
Sustainable development ensures a better life for future generations.
持続可能な開発は未来の世代のためにより良い生活を保証します。
A1 noun /ˈfriː taɪm/

free time

自由時間
Meaning
time when a person is not working or occupied and can do activities they enjoy
Example
She likes to read books in her free time.
彼女は自由時間に本を読むのが好きです。
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。
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。
B1 adjective /faɪˈnænʃəl/

financial

財務的
Meaning
relating to money, banking, or finance
Example
He made a sound financial decision by investing wisely.
彼は賢明に投資して、健全な財務的決定を下しました。
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。
B2 noun /ˈfæntəsi/

fantasy

ファンタジー
Meaning
a creation of the imagination, especially something improbable or impossible
Example
She has a vivid fantasy about traveling to space.
彼女は宇宙旅行に関する生き生きとしたファンタジーを持っています。
C1 adjective /ˈflʌstərd/

flustered

動揺した
Meaning
in a state of confusion or agitation
Example
She appeared flustered after being asked so many questions.
彼女はたくさんの質問をされた後、動揺しているように見えました。
C2 noun /fiːˈkʌndɪti/

fecundity

肥沃, 繁殖力
Meaning
the ability to produce an abundance of offspring or new growth; fertility
Example
The fecundity of the river delta supports diverse wildlife.
川の三角州の肥沃は多様な野生動物を支えています。
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。
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。
A1 noun /faɪv/

five

五
Meaning
The number 5; one more than four and one less than six.
Example
She bought five apples from the market.
彼女は市場で五つのリンゴを買いました。
A1 noun /flɔːr/

floor

床
Meaning
the lower surface of a room, on which one may walk
Example
The floor was covered with a soft carpet.
床は柔らかいカーペットで覆われていました。
C1 noun /fəˈtæləti/

fatality

致命的な事故
Meaning
An occurrence of death by accident, disaster, or violence.
Example
The accident resulted in one fatality.
その事故で1人が死亡した。
C2 noun ˌfjuːmɪˈɡeɪʃən

fumigation

燻蒸
Meaning
The practice of disinfecting or purifying an area using gas or smoke.
Example
Fumigation is an effective method to control pest infestations.
消毒は害虫の侵入を制御するための効果的な方法です。
A1 noun /fʌn/

fun

楽しみ
Meaning
enjoyment, amusement, or light-hearted pleasure
Example
We had a lot of fun at the party.
パーティーでとても楽しみました。
C1 noun /ˈfænsiər/

fancier

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

fain

喜んで、喜んで
Meaning
gladly, willingly, or with pleasure
Example
I would fain help you if I had the time.
もし時間があれば、喜んであなたを助けます。
C2 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。
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。
B2 adjective /ˈfɛmənɪn/

feminine

女性的
Meaning
having qualities traditionally associated with women; feminine in nature
Example
She has a very feminine style of dressing.
彼女はとても女性的な服装スタイルを持っています。
C2 noun /ˈfuːləri/

foolery

愚かさ
Meaning
Silly or foolish behavior or actions.
Example
His constant foolery made the meeting hard to take seriously.
彼の絶え間ない愚かさは、会議を真剣に受け止めるのを難しくしました。
C2 noun /ˈfeɪ.tə.lɪ.zəm/

fatalism

運命論
Meaning
the belief that all events are predetermined and inevitable
Example
He embraced fatalism, believing that nothing he did could change his destiny.
彼は運命論を受け入れ、自分の行動が運命を変えることはできないと信じていました。
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。
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。
B2 adjective, noun, verb /faʊl/

foul

Meaning
offensive to the senses; dirty or unpleasant; in sports, an unfair or illegal act
Example
The player was penalized for committing a foul.
B2 verb /flɪk/

flick

素早く叩く
Meaning
to move or cause to move with a sudden quick motion
Example
He flicked the switch to turn on the light.
彼はライトをつけるためにスイッチをフリックしました。
B1 noun /feɪθ/

Faith

信念; 信頼; 宗教的信仰;
Meaning
complete trust or confidence in someone or something; strong belief in religion
Example
She had unwavering faith in her team's ability to succeed.
彼女はチームの成功能力に揺るぎない信念を持っていました。
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。
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。
A2 noun /ˈfæʃ.ən/

fashion

ファッション
Meaning
a popular or accepted style of clothing, behavior, or way of doing something
Example
She always keeps up with the latest fashion.
彼女はいつも最新のファッションを追いかけています。
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。
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。
B2 verb /feɪd/

fade

色あせる
Meaning
To gradually lose brightness, color, or strength.
Example
The colors of the old photo have started to fade.
古い写真の色が薄れてきた。
B1 noun /ˈfʌŋkʃən/

function

機能
Meaning
An activity or purpose natural to or intended for a person or thing.
Example
The main function of the heart is to pump blood.
心臓の主な機能は血液をポンプすることです。
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 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。
A2 adjective /ˈfæstɪst/

fastest

最速の
Meaning
moving or capable of moving at the highest speed
Example
Usain Bolt is the fastest runner in the world.
ウサイン・ボルトは世界で最も速いランナーです。
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。
A2 adjective, adverb /ˈfæstər/

faster

速い
Meaning
moving or able to move quickly; more quickly than usual
Example
This car is faster than the old one.
この車は古い車より速いです。
B1 adjective /ˈfɒɡi/

foggy

霧の
Meaning
Full of or covered with fog; unclear or hazy.
Example
The mountain road was dangerous on the foggy morning.
山道は霧の朝に危険でした。
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。
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。
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。
B1 adjective /ˈfluː.ənt/

Fluent

流暢; 熟練
Meaning
able to speak a language easily and accurately; flowing smoothly and gracefully
Example
She is fluent in three languages including English and French.
彼女は英語とフランス語を含む3つの言語に堪能です。
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。
C2 adjective /ˈfɪliəl/

filial

息子や娘に関する; 親への敬意や愛情を示すこと
Meaning
relating to a son or daughter; showing respect or affection toward parents
Example
He showed filial respect by caring for his aging parents.
彼は年老いた両親の世話をすることでフィリアルな敬意を示しました。
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 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。
A2 adjective /ˈfroʊzən/

frozen

凍った
Meaning
preserved by being made extremely cold; turned into ice
Example
The lake was completely frozen during winter.
湖は冬に完全に凍っていた。
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 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。
C2 adjective /fɪˈdjuːʃəl/

fiducial

信頼の、基準点として機能する
Meaning
based on trust or confidence; serving as a standard of reference
Example
The fiducial point on the map ensures accurate measurements.
地図上のフィデュシャルポイントは正確な測定を確保します。
B2 noun /ˈfriːˌlænsər/

freelancer

フリーランサー
Meaning
A person who works independently without being permanently employed by one organization.
Example
She works as a freelancer designing websites for different clients.
彼女はフリーランサーとして、異なるクライアントのためにウェブサイトをデザインしています。
A2 noun /ˈfoʊldər/

folder

フォルダー
Meaning
a container or directory used to store and organize papers or digital files
Example
I saved all the photos in a separate folder.
すべての写真を別のフォルダーに保存しました。
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。
C1 adjective /fəˈnætɪkəl/

fanatical

熱狂的な
Meaning
showing extreme enthusiasm or obsession
Example
She has a fanatical interest in collecting vintage stamps.
彼女は古い切手を集めることに熱狂的な興味を持っています。
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。
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。
A1 noun/verb /fɪlm/

film

映画
Meaning
a motion picture or movie; or to record on camera
Example
They watched a film together on the weekend.
彼らは週末に一緒に映画を見ました。
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。
B2 verb /fɔɪl/

foil

阻止する
Meaning
To prevent something (especially a plan) from succeeding.
Example
The police foiled the robbery attempt.
警察は強盗未遂を阻止した。
B2 noun/adjective /ˈfluːɪd/

fluid

流体
Meaning
a substance that can flow easily, such as liquid or gas; smooth and adaptable
Example
The artist's fluid movements impressed the audience.
アーティストの流れるような動きは観客を感動させました。
B1 adjective /ˈfæsɪneɪtɪŋ/

Fascinating

魅力的
Meaning
extremely interesting; captivating; enchanting
Example
The documentary about ocean life was fascinating.
海の生命に関するドキュメンタリーは魅力的だった。
B1 adjective /ˈfɔːrmər/

former

元
Meaning
Having been previously in a particular role or position.
Example
He is a former president of the association.
彼はその協会の元会長です。
A2 noun /ˈfɪt.nəs/

fitness

フィットネス
Meaning
The condition of being physically fit and healthy, or the quality of being suitable to fulfill a particular role or task.
Example
Fitness tests ensure vehicle safety.
フィットネステストは車両の安全を確保します。
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 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。
C2 adjective /ˈfluːviəl/

fluvial

河川に関連する
Meaning
relating to or found in a river
Example
The fluvial deposits indicated the presence of an ancient river system.
河川堆積物は古代の川のシステムの存在を示していた。
B2 verb /ˈfæsən/

fasten

締める
Meaning
To attach or secure something firmly in place
Example
Please fasten your seatbelt before the plane takes off.
飛行機が離陸する前にシートベルトを締めてください。
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 noun /ˈfræk.ʃən/

Fraction

分数; 部分
Meaning
a numerical quantity that is not a whole number; a small or tiny part of something
Example
Only a small fraction of the population voted in the local election.
地方選挙で投票したのは人口のごく一部に過ぎなかった。
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 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。
B1 noun /ˈfɔːr.tʃən/

Fortune

運; 幸運; 財産
Meaning
chance or luck as an external, arbitrary force affecting human affairs; a large amount of money or assets
Example
He made his fortune by investing wisely in technology companies.
彼はテクノロジー企業に賢明に投資することで運を得ました。
A2 verb /fraɪ/

fry

揚げる
Meaning
to cook food in hot oil or fat
Example
She fries eggs for breakfast every morning.
彼女は毎朝朝食に卵を揚げます。
C2 noun /flɔːˈrɛsəns/

florescence

花の開花期
Meaning
The process, state, or period of flowering.
Example
The garden reached its peak florescence in spring.
庭は春に最盛期の花の開花期に達しました。
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。
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。
C2 verb /fɔːrˈdʒʌdʒ/

forejudge

前もって判断する
Meaning
To judge beforehand without adequate information.
Example
It is unfair to forejudge someone without knowing the facts.
事実を知らずに誰かを前もって判断するのは不公平です。
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 /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。
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。
A2 noun /ˈfɑːr.mər/

Farmer

農家
Meaning
a person who grows crops or raises animals for food or profit
Example
The farmer planted rice in the fertile fields this season.
This season, the farmer planted rice in the fertile fields.
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。
A1 verb /fɔːl/

fall

落ちる
Meaning
to drop down from a higher place; to decrease; to happen or occur
Example
The leaves fall from the trees in autumn.
秋に葉が木から落ちる。
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。
A2 number /ˈfɪfti/

fifty

五十
Meaning
the number 50
Example
The stadium can hold fifty thousand people.
スタジアムは五万人を収容できます。
B1 adjective /fɒnd/

fond

好き
Meaning
having a strong liking or affection for something or someone
Example
She is fond of painting and spends hours in front of her canvas.
彼女は絵を好きで、キャンバスの前で何時間も過ごします。
B2 noun ˈfreɪm.wɜːk

framework

枠組み
Meaning
An essential supporting structure of a building, vehicle, or object; a basic structure underlying a system, concept, or text.
Example
A strong framework is vital for governance.
強力な枠組みはガバナンスにとって重要です。
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。
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。
C1 adjective /ˈfiːlaɪn/

feline

猫に関する
Meaning
relating to or characteristic of cats
Example
Her movements were graceful and almost feline in their elegance.
彼女の動きは優雅で、ほとんど猫のようだった。
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。
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 /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 /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 /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 /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。
C2 adjective /fjuːˈɡeɪʃəs/

fugacious

儚い
Meaning
Lasting only a short time; fleeting or ephemeral.
Example
Youth is beautiful but fugacious.
青春は美しいが、儚い。
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。
A1 adjective /fɑːst/

Fast

速い; 迅速
Meaning
moving or happening quickly; rapid; swift
Example
She runs very fast in the morning.
彼女は朝にとても速く走ります。
C2 adjective /ˈfʊl.dʒənt/

fulgent

輝かしい
Meaning
Shining brightly; dazzling.
Example
The fulgent stars lit up the night sky.
輝かしい星々が夜空を照らした。
A2 verb /faɪt/

fight

戦う
Meaning
to engage in battle or combat; to struggle against
Example
The soldiers fight for their country.
兵士たちは自国のために戦っています。
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。
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。
C1 noun /frəˈdʒɪl.ɪ.ti/

fragility

もろさ
Meaning
The quality of being fragile; delicateness.
Example
The cornea's fragility increases with rubbing.
角膜のもろさはこすることで増加します。
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。
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 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。
C2 noun /ˈfɔːθ.raɪt.nəs/

forthrightness

坦率さ
Meaning
The quality of being honest and straightforward; directness.
Example
Her forthrightness made her a respected journalist.
Her forthrightness made her a respected journalist.
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。
C2 adjective /ˈfætʃuəs/

fatuous

愚か
Meaning
silly or foolish, especially in a self-satisfied way
Example
His fatuous comments during the meeting annoyed everyone.
会議中に彼の愚かなコメントは皆を苛立たせました。
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。
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。
B1 adjective /ˈflek.sə.bəl/

Flexible

柔軟な; 変更に適応可能
Meaning
able to bend easily; adaptable to change; not rigid
Example
She has a flexible work schedule that allows her to work from home.
彼女は自宅で働ける柔軟な仕事のスケジュールを持っています。
C2 adjective /ˈfɪt.fəl/

fitful

不規則な
Meaning
occurring in irregular bursts; not continuous or steady
Example
He had a fitful sleep due to the storm.
嵐のせいで彼は不規則な眠りをしていた。