feudalism
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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。
B2 noun /fɜːr/

Fur

毛皮
Meaning
thick hair covering the body of animals
Example
The cat's fur was soft and warm to touch.
猫の毛は触ると柔らかく温かかった。
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。
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。
A2 noun /fɑːrm/

farm

農場
Meaning
an area of land used for growing crops and raising animals
Example
They live on a farm with many animals.
彼らは多くの動物がいる農場に住んでいます。
A2 noun /ˈfɪɡ.jər/

Figure

図形; 画像; 数字;
Meaning
a number, especially one which forms part of official statistics; the shape of a human body
Example
The sales figure for this quarter exceeded all expectations.
この四半期の売上数字はすべての予想を超えました。
C2 noun /ˈfɔːltˌfaɪndər/

faultfinder

欠点探し人
Meaning
a person who habitually finds fault with others
Example
He is such a faultfinder that nothing anyone does is ever good enough.
彼は欠点探し人で、誰かが何かをしても決して十分ではありません。
C2 noun /ˈfrækɑː/

fracas

騒動
Meaning
A noisy disturbance or quarrel.
Example
The fracas outside the bar drew the attention of the police.
バーの外での騒動が警察の注意を引きました。
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 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 /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 /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 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。
C2 noun /floʊ/

floe

氷の板
Meaning
a large sheet of floating ice
Example
The polar bears rested on the ice floe.
北極熊は氷の板の上で休んでいた。
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 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 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, verb /ˈfrænʧaɪz/

franchise

フランチャイズ
Meaning
A legal right to sell or distribute goods or services in a specific area; to grant such a right.
Example
He opened a new fast-food franchise in the city.
彼は都市で新しいファーストフードのフランチャイズを開設しました。
B2 noun ˌfʌŋk.ʃəˈnæl.ə.ti

functionality

機能性
Meaning
The quality of being functional; the ability to work or operate as intended.
Example
The new refrigerator has improved functionality.
新しい冷蔵庫は機能性が向上しました。
B2 noun /fluːt/

Flute

フルート
Meaning
a musical wind instrument with holes along its length that is played by blowing across a hole at one end
Example
He played a sweet melody on his flute.
彼は自分のフルートで甘いメロディーを演奏しました。
B2 adjective /ˈfɛdərəl/

federal

フェデラル
Meaning
Relating to the central government of a federation.
Example
The federal government passed a new law on healthcare.
連邦政府は医療制度に関する新しい法律を通過させました。
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。
B2 adverb /ˈfɔ:rmoast/

Foremost

最も重要なこと; 何よりもまず
Meaning
most importantly; above all; in the first place
Example
First and foremost, we need to ensure safety.
まず第一に、安全を確保する必要があります。
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。
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。
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。
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。
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。
B1 adjective /fɪkst/

fixed

固定された, 安定した
Meaning
firmly in place; not changing or movable
Example
The schedule for the meeting is fixed for Monday morning.
会議のスケジュールは月曜日の朝に固定されています。
C2 verb /fɪltʃ/

filch

盗む
Meaning
to steal something in a sneaky or petty way
Example
He tried to filch a candy bar from the shop.
彼は店からキャンディバーを盗もうとした。
A2 noun /ˈfiːvər/

fever

熱
Meaning
a medical condition in which the body temperature is higher than normal
Example
He couldn’t go to work because he had a high fever.
高熱のため、彼は仕事に行けませんでした。
C2 noun /ˈfræŋkɪnsɛns/

frankincense

お香
Meaning
An aromatic gum resin used in incense and perfumes, often in religious ceremonies.
Example
The temple was filled with the sweet smell of burning frankincense.
寺院は燃えるお香の甘い香りで満ちていました。
B2 noun /ˈfreʃmən/

freshman

一年生
Meaning
a first-year student at a high school, college, or university
Example
The freshman felt nervous on his first day at university.
一年生は大学での初日に緊張していました。
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 noun /ˈfɪli/

filly

若い雌馬
Meaning
a young female horse
Example
The filly ran swiftly across the meadow.
その若い牝馬は草原を速く走った。
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。
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。
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。
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。
B1 noun fʌnd

fund

基金
Meaning
A sum of money saved or made available for a particular purpose.
Example
The government allocated a fund for disaster relief.
政府は災害救援のために基金を割り当てました。
C1 noun/verb /freɪ/

fray

争い, すり減る
Meaning
As a noun, a fight or heated dispute; as a verb, to unravel or wear out through friction.
Example
He tried to stay calm, but his nerves began to fray during the argument.
彼は冷静を保とうとしたが、議論の中で彼の神経はすり減り始めた。
C1 adjective /fərˈlɔːrn/

forlorn

孤独な, 絶望的な
Meaning
extremely sad, lonely, or abandoned
Example
The abandoned puppy looked so forlorn in the rain.
放置された子犬は雨の中でとても悲しそうに見えました。
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。
A1 noun /fʊt/

Foot

足
Meaning
the lower extremity of the leg that is in direct contact with the ground in standing or walking
Example
She hurt her foot while running.
彼女は走っている間に足を怪我しました。
C2 verb /feɪz/

faze

動揺させる
Meaning
to disturb or disconcert someone; to cause to feel unsettled
Example
She was not fazed by the unexpected question.
予期しない質問で動じなかった。
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 adjective /ˈfjuːzəbl/

fusible

融解可能な
Meaning
Capable of being melted or fused.
Example
The engineer used a fusible alloy in the experiment.
エンジニアは実験で融解可能な合金を使用しました。
B2 verb /ˈflʌrɪʃ/

flourish

Meaning
To grow or develop in a healthy or successful way.
Example
Her business began to flourish after she introduced online sales.
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 /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。
B2 adjective /fɔːrˈsiːəbl/

foreseeable

予測可能な
Meaning
Able to be predicted or expected in advance
Example
The company is unlikely to make changes in the foreseeable future.
その会社は予測可能な未来において変化を起こす可能性は低い。
B1 noun /ˈfaɪəˌfaɪtə/

firefighter

消防士
Meaning
a person whose job is to put out fires
Example
The firefighter saved the family from the burning building.
消防士は燃える建物から家族を救いました。
C2 adjective /ˈfɛkləs/

feckless

無能な, 責任感のない
Meaning
lacking initiative or strength of character; irresponsible
Example
His feckless attitude at work caused several missed deadlines.
彼の無能な態度が仕事でいくつかの期限を逃す原因となった。
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 /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。
B1 adjective /ˈfrʌstreɪtɪd/

frustrated

フラストレーション
Meaning
feeling annoyed or upset because of inability to achieve something
Example
She felt frustrated after failing the exam.
彼女は試験に失敗した後、フラストレーションを感じました。
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。
A2 noun /ˈfɔːrənər/ or /ˈfɑːrənər/

foreigner

外国人
Meaning
A person from another country.
Example
The city welcomes every foreigner with kindness.
その都市はすべての外国人を親切に迎えます。
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。
B1 noun flæɡz

flags

旗
Meaning
A piece of cloth or similar material, typically oblong or square, attachable by one edge to a pole or rope.
Example
The streets were decorated with national flags.
通りは国旗で飾られていました。
A1 noun /ˈfɛb.ruˌɛr.i/

february

2月
Meaning
The second month of the year in the Gregorian calendar, typically having 28 days, or 29 in a leap year.
Example
My birthday is in February, so I always look forward to this month.
私の誕生日は2月なので、いつもこの月を楽しみにしています。
B2 adjective /ˈfjʊə.ri.əs/

Furious

怒っている; 激怒した; 暴力的な;
Meaning
extremely angry; violent; fierce;
Example
She was furious when she discovered the mistake.
彼女はその間違いを発見したとき、怒っていました。
A2 noun /fækt/

fact

事実
Meaning
A thing that is known or proved to be true
Example
It is a fact that the Earth orbits the Sun.
地球が太陽の周りを回っているのは事実です。
B1 noun /feɪm/

Fame

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

fanciful

幻想的, 非現実的
Meaning
overimaginative, unrealistic, or whimsical
Example
The story was too fanciful to be true.
その話はあまりにも幻想的で、本当だとは思えなかった。
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 /foʊ ˈpɑː/

faux pas

社会的な失敗
Meaning
a social blunder or mistake in etiquette
Example
He committed a major faux pas by forgetting her birthday.
彼は彼女の誕生日を忘れて大きな社会的な失敗を犯した。
B2 verb /fliː/

flee

逃げる
Meaning
To run away from danger or a threatening situation.
Example
The villagers had to flee during the flood.
村人たちは洪水の間に逃げなければなりませんでした。
B2 adjective /ˈfʌŋkʃənl/

functional

機能的
Meaning
designed to be practical and useful, rather than just decorative
Example
The design of the chair is simple but highly functional.
椅子のデザインはシンプルですが、非常に機能的です。
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。
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。
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。
C2 noun /ˈflɪpənsi/

flippancy

軽薄
Meaning
lack of seriousness; showing a disrespectful or trivial attitude
Example
His flippancy during the meeting offended his colleagues.
会議中の彼の軽薄さは、同僚を不快にさせた。
B2 noun/verb /flɑːk/

flock

群れ
Meaning
a group of birds or animals; to gather or move in a crowd
Example
Tourists flocked to the beach during summer.
観光客は夏にビーチに集まりました。
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。
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。
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。
B1 adverb /ˈfɜːrstli/

firstly

まず
Meaning
used to introduce the first point or reason in a discussion or argument
Example
Firstly, we need to address the budget issue before proceeding.
まず、予算の問題に対処する必要があります。
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。
C1 noun /ˈfiːtəs/

fetus

胎児
Meaning
an unborn or unhatched offspring in the womb or egg
Example
The doctor explained the development of the fetus during pregnancy.
医師は妊娠中の胎児の発達について説明しました。
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。
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。
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。
B2 noun /fɔːrˈmeɪʃən/

formation

形成
Meaning
the action of forming or process of being formed
Example
The formation of the new company took several months.
新しい会社の形成には数ヶ月かかりました。
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。
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 /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 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。
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。
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 verb /floʊt/

float

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

felicitate

祝う
Meaning
to congratulate; to express good wishes
Example
We felicitated the graduating students at the ceremony.
私たちは式で卒業生を祝いました。
B2 verb /fɔːrˈsiː/

foresee

予見する
Meaning
To be aware of beforehand; to predict or expect.
Example
She could foresee the challenges ahead.
彼女は前方の課題を予見することができました。
A1 verb /ˈfɒloʊ/

follow

従う
Meaning
to move behind someone or something; to go after or come after
Example
The children followed their teacher into the classroom.
子供たちは先生について教室に入りました。
B2 adjective /ˈfeɪtl/

fatal

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

forecastle

フォアキャッスル
Meaning
The forward part of a ship below the deck, traditionally used as living quarters for the crew.
Example
The sailors gathered in the forecastle after their shift.
船員たちはシフト後にフォアキャッスルに集まりました。
A1 verb /faɪnd/

find

見つける
Meaning
to discover or locate something that was lost or hidden
Example
I can't find my keys anywhere.
私はどこにも鍵を見つけられません。
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。
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 /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。
C2 noun /ˈfɔːrˌnɑːlɪdʒ/

foreknowledge

予知
Meaning
Awareness of something before it happens or exists.
Example
The prophet claimed to have foreknowledge of the event.
預言者はその出来事の予知をしていると主張した。
C1 adjective /ˈfiːbl/

feeble

弱い, 無力
Meaning
lacking physical strength or vigor; weak
Example
After the illness, she felt too feeble to stand.
病気の後、彼女は立ち上がるにはあまりにも弱かった。
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！
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。
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。
C2 noun /fækˈtoʊtəm/

factotum

オールラウンダー
Meaning
an employee who does many different types of work; a general servant
Example
He worked as a factotum, handling both clerical and maintenance duties.
彼はファクトトムとして働き、事務的な仕事とメンテナンス作業の両方を担当していました。
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。
B2 noun /ˈfjʊr.i/

Fury

激しい怒りや暴力的な感情;
Meaning
wild or violent anger; extreme intensity of emotion or activity
Example
His fury was evident when he discovered someone had stolen his bicycle.
彼の怒りは彼が自転車を盗まれたことに気づいたときに明らかだった。
C1 noun /ˈfaɪərɑːm/

firearm

火器
Meaning
a weapon capable of firing a projectile using gunpowder or other propellant
Example
The police found a hidden firearm during the investigation.
警察は調査中に隠された銃器を発見しました。
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。
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。
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。
B2 noun ˈfreɪm.wɜːks

frameworks

枠組み
Meaning
A basic structure underlying a system, concept, or text; an essential supporting structure.
Example
Frameworks define the basis of systems.
枠組みはシステムの基盤を定義します。
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。
A1 adjective/noun /fɔːrθ/

fourth

第四
Meaning
Constituting number four in a sequence; coming after the third in position.
Example
He finished in fourth place in the race.
彼はレースで第四位になった。
C2 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。
B1 noun, verb /ˈfaɪ.næns/ or /fəˈnæns/

finance

ファイナンス
Meaning
the management of money and investments, or to provide funds for something
Example
The company secured finance from a major bank.
その会社は大手銀行から資金を調達しました。