facetious
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C2 adjective /fəˈsiːʃəs/

facetious

皮肉な
Meaning
Treating serious issues with deliberately inappropriate humor
Example
He was being facetious when he said he wanted to live on the moon.
彼は月に住みたいと言ったとき、皮肉を言っていた。
C2 adjective /ˈfiːbraɪl/

febrile

発熱の、興奮した
Meaning
having or showing the symptoms of a fever; or highly excitable or agitated
Example
The patient was in a febrile state with high temperature.
患者は高い温度の熱の状態にありました。
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。
A2 noun /fluː/

flu

インフルエンザ
Meaning
a contagious viral illness causing fever, aches, and respiratory symptoms; influenza
Example
She stayed home because she had the flu.
彼女はインフルエンザなので家にいました。
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。
C1 verb /fɔːrˈseɪk/

forsake

Meaning
to abandon or give up something or someone
Example
He decided not to forsake his old friends despite his success.
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 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。
A1 noun /fruːt/

fruit

果物
Meaning
The sweet and fleshy product of a plant that contains seeds.
Example
Mango is my favorite fruit.
マンゴーは私のお気に入りのフルーツです。
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。
C2 noun /fɔːn/

faun

ファウノ (神話の生き物)
Meaning
a mythological creature that is half human and half goat
Example
The sculpture depicted a playful faun dancing in the forest.
彫刻は、森の中で踊っている遊び心のあるファウンを描いていました。
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 noun /ˈfæn.si/

Fancy

興味; 想像やファンタジー
Meaning
a feeling of liking or wanting something; imagination or fantasy
Example
The child had a fancy for becoming a famous astronaut when he grew up.
その子供は大きくなったら有名な宇宙飛行士になることを夢見ていました。
A1 verb /feɪs/

face

直面する
Meaning
to confront or deal with; to turn toward; to have the front in a particular direction
Example
She had to face many challenges in her new job.
彼女は新しい仕事で多くの課題に直面しなければならなかった。
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。
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。
C1 adjective /frəˈnɛtɪk/

frenetic

狂乱の
Meaning
Fast and energetic in a wild or uncontrolled way.
Example
The stock market experienced frenetic trading after the announcement.
発表後、株式市場は狂乱の取引を経験しました。
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。
C1 verb ˈflʌk.tʃu.eɪt

fluctuate

変動する
Meaning
To regularly increase or decrease.
Example
Stock prices fluctuate due to market conditions.
株価は市場の状況によって変動します。
C1 noun /ˈfɪɡjərˌhɛd/

figurehead

名目上の指導者
Meaning
a nominal leader with no real power; a symbolic head
Example
The king was merely a figurehead with no real authority.
王は実際の権限を持たない象徴的な指導者に過ぎなかった。
C1 verb /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。
B1 noun /ˈfaɪ.tər/

Fighter

戦闘機
Meaning
a military aircraft designed for attacking other aircraft; a person who fights
Example
The fighter jet flew overhead during the military parade.
戦闘機は軍事パレードの間に私たちの頭上を飛びました。
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。
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。
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。
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。
B1 noun faʊnˈdeɪʃən

foundation

基礎
Meaning
The lowest load-bearing part of a building, typically below ground level.
Example
The foundation of the building was laid with strong materials.
ビルの基礎は強力な材料で作られました。
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。
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 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。
B1 adjective /fɜːrm/

Firm

堅い; 強い; 安定している; 圧力に屈しない
Meaning
solid; stable; strong; not yielding to pressure
Example
She has a firm grip on the rope.
彼女はロープをしっかり握っています。
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。
C2 adjective /ˈfraʊzi/

frowzy

だらしない
Meaning
Unkempt, messy, or having a musty, unpleasant smell.
Example
He entered the room with a frowzy appearance after sleeping on the couch.
彼はソファで寝た後、だらしない外見で部屋に入ってきました。
B1 noun /ˈfeɪvər/

favor

お願い
Meaning
An act of kindness or approval.
Example
She asked him for a small favor.
彼女は彼に小さなお願いをした。
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。
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。
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 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 /ˈfɔːrˌθɔːt/

forethought

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

fateful

運命的または致命的
Meaning
having significant or disastrous consequences
Example
Their fateful decision changed the course of history.
彼らの運命的な決定は歴史の流れを変えました。
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。
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。
B2 noun /ˈfækəlti/

faculty

能力、学部
Meaning
an inherent mental or physical ability; a division of a university
Example
She has a remarkable faculty for languages.
彼女は言語に対して驚異的な能力を持っています。
A2 noun /ˈfæktəri/

factory

工場
Meaning
A building or group of buildings where goods are manufactured.
Example
He works in a shoe factory.
彼は靴工場で働いています。
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。
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。
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。
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 /ˈflʌməks/

flummox

困惑させる
Meaning
To confuse or bewilder someone completely.
Example
The complicated puzzle flummoxed the students.
その複雑なパズルは学生を困惑させた。
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。
B2 noun /ˈfɪŋ.ɡər.prɪnt/

Fingerprint

指紋
Meaning
an impression or mark made on a surface by a person's fingertip; unique identification pattern
Example
The police found his fingerprints on the door handle at the crime scene.
警察は犯罪現場でドアの取っ手に彼の指紋を見つけました。
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。
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/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。
B1 noun fəˈsɪl.ɪ.tiz

facilities

施設
Meaning
A place, amenity, or piece of equipment provided for a particular purpose.
Example
Facilities improve industrial productivity.
施設は産業の生産性を向上させます。
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。
B2 noun /flɛkˈsɪbɪləti/

flexibility

柔軟性
Meaning
The quality of bending easily without breaking; willingness to change or compromise.
Example
The flexibility of the working hours made it easier to balance work and personal life.
労働時間のフレキシビリティにより、仕事とプライベート生活のバランスが取りやすくなった。
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。
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。
C1 noun /ˈfʌŋɡəs/

fungus

菌類
Meaning
a spore-producing organism feeding on organic matter, including molds, yeast, and mushrooms
Example
A strange fungus was growing on the old tree.
古い木に奇妙な菌類が生えていました。
B2 noun /ˈfɔːr.hed/

Forehead

額
Meaning
the part of the face above the eyebrows and below the hairline
Example
He wiped the sweat from his forehead.
彼は額から汗を拭った。
B2 noun /ˈfeð.ər/

Feather

鳥の羽
Meaning
one of the light structures that cover a bird's body
Example
The peacock has beautiful colorful feathers.
孔雀は美しい色とりどりの羽を持っています。
B2 noun fɪkst ˈɪnkʌm

fixed income

固定収入
Meaning
Investment that provides a return in the form of fixed periodic payments.
Example
Fixed income investments provide reliable returns.
固定収入の投資は信頼性の高いリターンを提供します。
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。
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。
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。
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 adjective /fɪərs/

Fierce

激しい; 攻撃的; 強い感情や決意を示す
Meaning
violent; aggressive; showing strong feeling or determination
Example
The fierce storm destroyed many houses in the village.
激しい嵐が村の多くの家を壊しました。
B2 noun /ˈfleɪ.vər/

Flavour

風味
Meaning
the distinctive taste of a food or drink; a particular quality or atmosphere
Example
The soup had a rich flavour of herbs and spices from the garden.
スープには庭からのハーブとスパイスの豊かな風味がありました。
C2 adjective /ˈfuːlˌhɑːrdi/

foolhardy

無謀な
Meaning
Recklessly bold or rash; taking foolish risks.
Example
It was foolhardy of him to climb the mountain without proper gear.
適切な装備なしで山に登るのは無謀だった。
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。
C2 noun /ˌfɔːrɔːrdɪˈneɪʃən/

foreordination

予定
Meaning
the act of determining something in advance; predestination
Example
The doctrine of foreordination suggests that events are fixed by divine will.
予定説の教義は、出来事は神の意志によって定められていると示唆しています。
C1 adjective ˈfæʃ.ɪst

fascist

ファシスト
Meaning
Relating to or characteristic of fascism; extremely authoritarian.
Example
Fascist governance undermines freedom.
ファシスト政権は自由を脅かす。
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。
A1 number /ˈfɔːrti/

forty

幸せ
Meaning
the number 40; ten times four
Example
She celebrated her forty years of life with a big party.
彼女は賞を受け取ったとき、幸せを隠せなかった。
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 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。
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。
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。
B2 adjective /ˌfʌndəˈmɛntl/

fundamental

Meaning
forming a necessary base or core; of central importance
Example
Honesty is a fundamental principle of good leadership.
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。
B2 verb, noun, adjective /flʌʃ/

flush

顔を赤くする / 水で洗浄する
Meaning
to become red in the face, usually from embarrassment, heat, or excitement; to clean something with a flow of water
Example
She flushed with embarrassment when she realized her mistake.
彼女は自分のミスに気づいたとき、恥ずかしさで顔が赤くなった。
C1 adjective /ˈfɪs.kəl/

fiscal

財政の
Meaning
Relating to government revenue, especially taxes, or public money management.
Example
The government introduced new fiscal policies to control inflation.
政府はインフレを抑制するために新しい財政政策を導入しました。
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。
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。
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 adjective /ˈfræɡməntɪd/

fragmented

断片化, 分割, 不完全
Meaning
Having been broken into fragments; disjointed or incomplete.
Example
The information was fragmented and difficult to understand.
情報は断片化されていて、理解するのが難しかった。
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。
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。
C2 adjective /ˈfʌŋɡəs/

fungous

きのこに似た
Meaning
relating to or resembling a fungus
Example
The damp basement had a fungous smell.
湿った地下室はきのこに似た匂いがした。
B1 verb /fel/

fell

倒す, 伐採する
Meaning
to cut down a tree; to cause to fall; to strike down
Example
The lumberjacks felled several trees in the forest today.
木こりたちは今日、森の中でいくつかの木を倒しました。
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。
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 /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。
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。
B2 noun /ˈfriːdəm ˌfaɪtər/

freedom fighter

自由の戦士
Meaning
a person who takes part in an armed or political struggle to achieve freedom or independence for their people or country
Example
The freedom fighter dedicated his life to the liberation of his homeland.
その自由の戦士は祖国の解放のために人生を捧げた。
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。
B2 adjective /ˌfɔːrθˈkʌmɪŋ/

forthcoming

近づいている
Meaning
about to happen soon; willing to share information
Example
The company announced its forthcoming product launch.
会社は近づいている製品の発売を発表しました。
A1 number /ˌfɪfˈtiːn/

fifteen

十五
Meaning
the number 15
Example
There are fifteen students in the class.
クラスには十五人の生徒がいます。
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。
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。
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。
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 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 noun /ˈfriːˌθɪŋkər/

freethinker

自由思想家
Meaning
A person who forms opinions based on reason and independent thought rather than tradition or authority.
Example
Voltaire was considered a great freethinker of his time.
ヴォルテールは彼の時代の偉大な自由思想家と見なされていました。
A2 noun /ˈflaɪ.ɪŋ ˈkriː.tʃər/

Flying creature

飛行生物
Meaning
any animal that has the ability to fly through the air
Example
Birds, bats, and insects are all examples of flying creatures.
鳥、コウモリ、昆虫は飛行生物の例です。
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。
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 verb /ˈfɛdərət/

federate

連邦する
Meaning
to unite in a league or federation; to form an alliance
Example
Several states federated to create a stronger union.
いくつかの州が強い連邦を作るために団結しました。
C1 noun/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 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。
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。
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 adjective /fəˈloʊniəs/

felonious

重大な犯罪に関連する
Meaning
relating to or involved in serious criminal activity
Example
He was charged with felonious assault after the incident.
事件の後、彼は重罪暴行で起訴されました。
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。
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。
B2 noun /fleɪm/

Flame

炎
Meaning
a hot glowing body of ignited gas that is generated by something on fire
Example
The candle flame flickered gently in the evening breeze.
キャンドルの火花が夕暮れの風に揺れていました。
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。
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。
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。