flux
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C1 noun /flʌks/

flux

Meaning
continuous change or movement; the rate of flow of something
Example
The company was in a state of constant flux during the reorganization.
C1 verb /flɪntʃ/

flinch

Meaning
to suddenly move back or away due to fear or pain
Example
He didn’t flinch when the doctor gave him the injection.
C1 noun /fɪkˈseɪ.ʃən/

fixation

Meaning
An obsessive interest in or feeling about someone or something.
Example
His fixation on perfectionism delayed project completion.
C1 noun /ˈfræk.tʃər/

Fracture

Meaning
the cracking or breaking of a hard object or material; a break in a bone
Example
The doctor confirmed that he had a hairline fracture in his wrist.
C1 noun/verb /fliːs/

fleece

Meaning
The woolly covering of a sheep; as a verb, to swindle or cheat someone.
Example
The farmer sheared the sheep’s fleece carefully.
C1 verb /ˈfɜːrmɛnt/

ferment

Meaning
to undergo a chemical process where sugars are converted to alcohol or acid; to incite or stir up change
Example
The grapes are left to ferment for several weeks.
C1 noun /ˈfɛləni/

felony

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.
C1 adjective /ˈflɪmzi/

flimsy

Meaning
weak, fragile, or lacking in strength; not convincing
Example
The chair was too flimsy to support his weight.
C1 adjective /ˈflaʊəri/

flowery

Meaning
Full of flowers or overly elaborate in style or language.
Example
She wrote a flowery letter filled with poetic phrases.
C1 noun /ˈfɔːrˌfɑːðər/

forefather

Meaning
an ancestor, especially one who was part of an earlier generation of a family or nation
Example
Our forefathers fought for independence.
C1 noun ˌfɜːr.tɪ.laɪˈzeɪ.ʃən

fertilization

Meaning
The process of adding nutrients to soil to increase crop productivity.
Example
Organic fertilization enhances soil health.
C1 noun /flæt fɪʃ/

Flat fish

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.
C1 noun /ˈfɔːrmən/

foreman

Meaning
a person in charge of a group of workers, especially in a factory or construction site
Example
The foreman supervised the workers on the construction site.
C1 adjective /ˈfruː.ɡəl/

Frugal

Meaning
economical; thrifty;
Example
She is very frugal and saves money by buying only necessary items.
C1 noun /ˈfɔːrˌbɛərz/

forebears

Meaning
Ancestors or people in previous generations from whom one is descended.
Example
We must honor the traditions of our forebears.
C1 noun ˈflɔː.rə ænd ˈfɔː.nə

flora and fauna

Meaning
The plants and animals of a particular region, habitat, or geological period.
Example
The Galápagos Islands have unique flora and fauna.
C1 adjective /fəˈroʊ.ʃəs/

Ferocious

Meaning
savagely fierce, cruel, or violent; extremely aggressive
Example
The ferocious storm destroyed many houses in the coastal area.
C1 noun /ˌfæb.rɪˈkeɪ.ʃən/

fabrication

Meaning
The invention of false or misleading information; a lie or falsehood.
Example
The article was full of fabrication and misleading claims.
C1 adjective, adverb (informal, vulgar) /ˈfʌkɪŋ/

fucking

Meaning
used for emphasis, often expressing anger or frustration (vulgar slang)
Example
It was a fucking disaster!
C1 adjective /frəˈnɛtɪk/

frenetic

Meaning
Fast and energetic in a wild or uncontrolled way.
Example
The stock market experienced frenetic trading after the announcement.
C1 noun /frɪndʒ/

fringe

Meaning
A decorative border of threads; the outer edge or margin of something.
Example
The festival had a fringe of small independent performances.
C1 adjective /ˈflæʃi/

flashy

Meaning
ostentatious or showy in a way that attracts attention
Example
He drove a flashy sports car through the city streets.
C1 noun /fəˈsɑːd/

facade

Meaning
The front of a building; a false or superficial appearance
Example
The building's glass facade reflected the sunset.
C1 noun /fəˈrɒs.ə.ti/

ferocity

Meaning
The state or quality of being ferocious; extreme fierceness or violence.
Example
The storm's ferocity was devastating.
C1 noun /ˈfoʊ.kəs ˈtræk.ɪŋ/

focus tracking

Meaning
A technique of monitoring and maintaining attention on specific tasks or goals.
Example
Proper focus tracking improves productivity.
C1 adjective /ˈfrɔːdjʊlənt/

fraudulent

Meaning
Involving or using deceit, especially criminal deception.
Example
He was arrested for making fraudulent insurance claims.
C1 noun /ˈfɪɡjərˌhɛd/

figurehead

Meaning
a nominal leader with no real power; a symbolic head
Example
The king was merely a figurehead with no real authority.
C1 verb /ˈflaʊndər/

flounder

Meaning
To struggle or stagger clumsily; to experience difficulty or confusion.
Example
He floundered in the interview when asked difficult questions.
C1 noun ˈfɜːr.vɚ

fervor

Meaning
Strong passion or enthusiasm for something.
Example
He spoke with great fervor about his vision for the company.
C1 noun /fɪˈnɛs/

finesse

Meaning
Subtlety and skill; refinement and delicacy in performance or artistry.
Example
The artist painted with great finesse.
C1 noun /ˈfɔːreɪ/

foray

Meaning
A sudden short attack or attempt, especially into new activity or territory.
Example
The company made its first foray into the international market.
C1 noun /ˈfɔːrɡraʊnd/

foreground

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.
C1 adjective /ˌfʊl ˈbɒd.id/

full-bodied

Meaning
Having a strong, rich, and robust quality, especially of wine, coffee, or voice.
Example
He prefers a full-bodied red wine with his dinner.
C1 noun /ˈfɒdər/

fodder

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.
C1 noun /fɪˈdɛl.ɪ.ti/

fidelity

Meaning
Faithfulness to a person, cause, or belief, demonstrated by continuing loyalty and support.
Example
A dog's fidelity to its owner is unmatched.
C1 noun /ˈfɔːr.tɪ.tjuːd/

fortitude

Meaning
Courage in pain or adversity; mental and emotional strength in facing difficulty.
Example
She faced adversity with great fortitude.
C1 noun /ˈfaɪər.wɔːl/

firewall

Meaning
A network security system that monitors and controls incoming and outgoing network traffic based on predetermined security rules.
Example
A firewall protects networks from cyber-attacks.
C1 noun /ˈfɔːrˌbɛər/

forebear

Meaning
An ancestor, especially one who lived a long time ago.
Example
He often speaks of his forebears with great respect.
C1 adjective /ˈfaɪə.ri/

Fiery

Meaning
burning; passionate; hot-tempered; showing strong emotion
Example
She has a fiery temper that flares up quickly.
C1 noun /ˈfoʊliɪdʒ/

foliage

Meaning
The leaves of a plant, collectively.
Example
The autumn foliage looked stunning in the park.
C1 noun /fiːnd/

fiend

Meaning
an evil spirit or demon; a wicked or cruel person; someone obsessed with a particular thing
Example
He is a real fiend when it comes to solving puzzles.
C1 noun /fiːt/

feat

Meaning
an achievement that requires great courage, skill, or strength
Example
Climbing Mount Everest was a remarkable feat.
C1 noun/verb /freɪ/

fray

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.
C1 adjective /ˈfɔːrmətɪv/

formative

Meaning
Having a lasting influence on a person's development or character.
Example
Childhood is often described as a formative stage in life.
C1 adjective /ˈfjuː.dəl/

feudal

Meaning
relating to the system of feudalism, a medieval social system based on land ownership and obligations
Example
The castle is a remnant of the feudal era.
C1 noun /ˈfæs.ɪt/

facet

Meaning
One of the many aspects or features of something; a particular part or element of something.
Example
Every facet of the project was carefully analyzed.
C1 noun /fɑːrs/

farce

Meaning
a comic dramatic work using buffoonery and horseplay, or a ridiculous situation
Example
The meeting turned into a complete farce with everyone arguing.
C1 adjective /ˈfruːt.ləs/

Fruitless

Meaning
unsuccessful; futile; pointless;
Example
After hours of searching, their efforts proved fruitless.
C1 noun /ˈfɪʃˌmʌŋ.ɡər/

fishmonger

Meaning
a person or store that sells fish
Example
I bought fresh salmon from the local fishmonger.
C1 adjective /ˈfaɪ.naɪt/

Finite

Meaning
limited; having bounds or limits; not infinite
Example
Earth has finite natural resources.
C1 verb /fɔːrˈɡoʊ/

forego

Meaning
to decide not to do or have something pleasant or valuable
Example
She decided to forego dessert to maintain her diet.
C1 noun /fɪˈnɑːleɪ/

finale

Meaning
the last part or conclusion of a performance, event, or series
Example
The concert ended with a spectacular finale.
C1 noun /ˈfɔːrsəm/

foursome

Meaning
a group of four people or things, especially in games or social activities
Example
The foursome enjoyed a game of golf together.
C1 noun /ˈfreɪlti/

frailty

Meaning
The condition of being weak, delicate, or easily broken.
Example
Old age often comes with physical frailty.
C1 noun /ˈfjuː.də.lɪ.zəm/

feudalism

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.
C1 adjective /frəˈtɜːrnəl/

fraternal

Meaning
Relating to brothers or brotherhood; friendly and supportive.
Example
The two nations maintain a fraternal relationship.
C1 noun, verb /ˈfɛrɪt/

ferret

Meaning
a small domesticated animal used for hunting; to search or uncover something persistently
Example
He ferreted out the hidden documents.
C1 noun /ˈfeɪvərɪtɪzəm/

favoritism

Meaning
the practice of giving unfair preferential treatment to one person or group
Example
The manager was accused of favoritism towards certain employees.
C1 noun /fəˈtæləti/

fatality

Meaning
An occurrence of death by accident, disaster, or violence.
Example
The accident resulted in one fatality.
C1 noun /ˈfjʊərɔːr/

furor

Meaning
An outbreak of public anger or excitement.
Example
The politician's remarks created a furor in the media.
C1 adjective /ˈfliː.tɪŋ/

fleeting

Meaning
Lasting for a very short time; passing quickly.
Example
Happiness can be fleeting, so cherish every moment.
C1 noun /ˈfiːtəs/

fetus

Meaning
an unborn or unhatched offspring in the womb or egg
Example
The doctor explained the development of the fetus during pregnancy.
C1 adjective ˈfjuː.taɪl

futile

Meaning
Incapable of producing any useful result; pointless.
Example
His attempts to change the situation were futile.
C1 adjective /freɪl/

frail

Meaning
Physically weak and delicate.
Example
The old man was too frail to walk without help.
C1 adjective /ˈfɑːð.ər.ləs/

fatherless

Meaning
without a father
Example
The fatherless child relied on the support of his community.
C1 adjective /fɪkˈtɪʃəs/

fictitious

Meaning
not real or true; imaginary or fabricated
Example
The story he told was entirely fictitious.
C1 adjective fæsˈtɪd.i.əs

fastidious

Meaning
Very attentive to and concerned about accuracy and detail.
Example
She is fastidious about maintaining cleanliness.
C1 adjective /ˈfleɪɡrənt/

flagrant

Meaning
shockingly noticeable or evident; glaringly wrong
Example
It was a flagrant violation of the rules.
C1 noun /fɔːrˈkloʊʒər/

foreclosure

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.
C1 adjective /ˈfeɪt.fəl/

fateful

Meaning
having significant or disastrous consequences
Example
Their fateful decision changed the course of history.
C1 noun ˌflʌk.tʃuˈeɪ.ʃən

fluctuation

Meaning
An irregular rising and falling in number or amount; a variation.
Example
The stock market experiences frequent fluctuation.
C1 noun /frɪˈvɒləti/

frivolity

Meaning
Lack of seriousness; silly or trivial behavior.
Example
The teacher discouraged frivolity during the exam.
C1 verb /fɔːrˈɡoʊ/

forgo

Meaning
to decide not to do or have something
Example
She decided to forgo dessert to maintain her diet.
C1 adjective /ˈfɔːrθˌraɪt/

forthright

Meaning
Direct and honest in speech or behavior; straightforward.
Example
She was forthright in her criticism of the policy.
C1 adjective /ˈfɪɡərətɪv/

figurative

Meaning
not literal; using figures of speech or symbolic representation
Example
She used figurative language to describe her feelings.
C1 adjective /ˈfuːlpruːf/

foolproof

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.
C1 noun ˌfiː.zəˈbɪl.ə.ti

feasibility

Meaning
The state or degree of being easily or conveniently done; possibility.
Example
The company conducted a feasibility study before launching the project.
C1 adjective /ˈfrɪvələs/

frivolous

Meaning
Not having any serious purpose or value; silly or unimportant.
Example
She dismissed the frivolous complaint quickly.
C1 adjective /ˈfrɪdʒɪd/

Frigid

Meaning
extremely cold; freezing; icy
Example
The frigid weather made it difficult to go outside.
C1 adjective /ˈflʌstərd/

flustered

Meaning
in a state of confusion or agitation
Example
She appeared flustered after being asked so many questions.
C1 verb /ˈflɪk.ər/

flicker

Meaning
to shine unsteadily or waver between light and dark
Example
The candle flickered in the wind.
C1 adverb /ˈfɪksɪdli/

Fixedly

Meaning
in a steady, unmoving manner; with intense concentration
Example
He stared fixedly at the painting.
C1 verb /ˈfɜːr.tɪ.laɪz/

fertilize

Meaning
to make soil or land more fertile by adding substances
Example
Farmers fertilize the fields to increase crop yield.
C1 adjective /ˈfeɪl.seɪf/

fail-safe

Meaning
designed to prevent failure or accidents; guaranteed to work correctly
Example
The engineers installed a fail-safe mechanism in the nuclear plant.
C1 verb /fɔːrˈtɛl/

foretell

Meaning
to predict or announce something before it happens
Example
The old man claimed he could foretell the future.
C1 noun /ˈfoʊk.lɔːr/

folk-lore

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.
C1 noun /ˈfɔːr.teɪ/ or /fɔːrt/

forte

Meaning
a strong ability or talent; something one does particularly well
Example
Cooking is definitely her forte.
C1 noun /ˈflɔː.rə/

flora

Meaning
The plant life found in a particular region or habitat.
Example
The Amazon rainforest is home to a vast flora diversity.
C1 noun /ˈfɛlən/

felon

Meaning
a person who has committed a serious crime
Example
The felon was sentenced to ten years in prison.
C1 noun, verb /ˈfrænʧaɪz/

franchise

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.
C1 adjective /flæmˈbɔɪənt/

flamboyant

Meaning
showy, strikingly bold or colorful; confident and lively
Example
His flamboyant style drew everyone's attention at the party.
C1 noun (plural of fungus) /ˈfʌndʒaɪ/

fungi

Meaning
a group of spore-producing organisms such as mushrooms, molds, and yeasts
Example
Fungi play an important role in breaking down organic matter in nature.
C1 noun /ˈfɔːrdʒər/

forger

Meaning
a person who makes fake documents, artworks, or signatures
Example
The police arrested a forger who had been selling counterfeit paintings.
C1 adverb /ˈfeɪ.təl.i/

Fatally

Meaning
in a way that causes death; with deadly consequences; critically
Example
The accident fatally injured two passengers.
C1 noun /ˌfɜːrmənˈteɪʃən/

fermentation

Meaning
a chemical process by which substances like sugar are converted into alcohol or acids using microorganisms
Example
The fermentation of grapes produces wine.
C1 noun /ˈfæm.ɪn/

Famine

Meaning
extreme scarcity of food; a period when food is extremely scarce
Example
The severe drought led to widespread famine in the region.
C1 verb /ˈfæbrɪkeɪt/

fabricate

Meaning
to invent or concoct something, often with the intent to deceive; or to construct or manufacture
Example
The witness fabricated his testimony to protect himself.
C1 adjective ˈfɔːr.mɪ.də.bəl

formidable

Meaning
Inspiring fear or respect through being impressively large, powerful, intense, or capable.
Example
The boxer was a formidable opponent in the ring.
C1 verb /ˈflʌtər/

flutter

Meaning
to move or flap quickly and lightly; to beat or wave with small rapid motions
Example
The butterfly began to flutter its wings in the sunlight.
C1 adjective /ˈfɪk.əl/

Fickle

Meaning
changeable; inconstant; liable to sudden unpredictable change
Example
His fickle nature made it hard to trust his promises.
C1 noun /faɪˈnælɪti/

finality

Meaning
the quality of being final or irreversible; a sense of conclusiveness
Example
The judge's decision gave the case a sense of finality.
C1 noun /ˈflæn.əl/

Flannel

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.
C1 verb /fɔːˈbɛər/

forbear

Meaning
To refrain from doing something; to show patience or self-control.
Example
She forbore from commenting on his mistake.
C1 noun ˈfæl.ə.si

fallacy

Meaning
False belief, misconception, false reasoning.
Example
The idea that success comes easy is a fallacy.
C1 verb /flaʊt/

flout

Meaning
To openly disregard or show contempt for a rule or law.
Example
The company was fined for flouting environmental regulations.
C1 verb /ˈfɛdərət/

federate

Meaning
to unite in a league or federation; to form an alliance
Example
Several states federated to create a stronger union.
C1 adjective /ˌfɑːrˈfetʃt/

farfetched

Meaning
unlikely to happen or be true; improbable
Example
His explanation for being late sounded farfetched.
C1 noun /fɪˈnænʃɪər/

financier

Meaning
a person who manages large amounts of money or investments
Example
The financier advised the company on its investments.
C1 verb /fɔːrˈkloʊz/

foreclose

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.
C1 noun, verb /ˈfɜːrloʊ/

furlough

Meaning
temporary leave of absence from work, especially that granted to an employee or soldier
Example
Many workers were placed on furlough during the crisis.
C1 verb /ˈfɔːlsɪfaɪ/

falsify

Meaning
to make something false or to misrepresent
Example
He tried to falsify the documents to avoid taxes.
C1 adjective /fərˈlɔːrn/

forlorn

Meaning
extremely sad, lonely, or abandoned
Example
The abandoned puppy looked so forlorn in the rain.
C1 noun ˌfɔːtɪfɪˈkeɪʃn

fortification

Meaning
A defensive wall or other reinforcement built to strengthen a place against attack.
Example
The fortifications protected the city.
C1 noun /ˈfɔːrwɜːrd/

foreword

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.
C1 noun /foʊ/

foe

Meaning
an enemy or opponent
Example
The knight fought bravely against his foe.
C1 verb /ˈfɔːrtɪˌfaɪ/

fortify

Meaning
To strengthen a place, person, or thing physically or mentally.
Example
They fortified the city walls to protect against invasion.
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.
C1 verb /flɔːnt/

flaunt

Meaning
to show off something proudly, often to attract attention
Example
She likes to flaunt her new jewelry at parties.
C1 noun /ˈfɪʃ.ər/

fissure

Meaning
a long, narrow opening or crack in a surface or object
Example
The earthquake caused a deep fissure in the road.
C1 noun /fɔːrˈmæl.ə.ti/

Formality

Meaning
the rigid observance of rules of convention or etiquette; a thing done simply to comply with requirements
Example
The signing of the contract was just a formality; the deal was already agreed upon.
C1 noun fluˈɪd.ɪ.ti

fluidity

Meaning
The ability of a substance to flow easily; smooth and graceful movement or style.
Example
The fluidity of the dancer's movements was mesmerizing.