fluctuate
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C1 verb ˈflʌk.tʃu.eɪt

fluctuate

Meaning
To regularly increase or decrease.
Example
Stock prices fluctuate due to market conditions.
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 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 verb/noun ˈfæð.əm

fathom

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.
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.
C1 noun /foʊ/

foe

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

fanatical

Meaning
showing extreme enthusiasm or obsession
Example
She has a fanatical interest in collecting vintage stamps.
C1 adjective /fəˈnætɪk/

Fanatic

Meaning
extremely passionate about something; showing excessive enthusiasm or devotion
Example
He is a fanatic supporter of his football team.
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 noun /fəˈtæləti/

fatality

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

fledgling

Meaning
New, inexperienced, newly established.
Example
The fledgling startup needs investment.
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 adjective /frɔːt/

fraught

Meaning
Filled with or likely to result in something undesirable.
Example
The negotiations were fraught with tension and uncertainty.
C1 noun /fəˈnætɪsɪzəm/

fanaticism

Meaning
the quality of being fanatical; extreme zeal or obsession
Example
Religious fanaticism can lead to intolerance and conflict.
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 /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 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 /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 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 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 /frəˈdʒɪl.ɪ.ti/

fragility

Meaning
The quality of being fragile; delicateness.
Example
The cornea's fragility increases with rubbing.
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 /ˈfoʊliɪdʒ/

foliage

Meaning
The leaves of a plant, collectively.
Example
The autumn foliage looked stunning in the park.
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/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 ˈflʌd proʊn

flood-prone

Meaning
Susceptible to flooding; likely to experience floods frequently.
Example
Bangladesh is a flood-prone deltaic nation.
C1 noun flɛər

flair

Meaning
A natural ability to do something well.
Example
She has a flair for design, always creating visually stunning work.
C1 adjective /ˈfɑːð.ər.ləs/

fatherless

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

frailty

Meaning
The condition of being weak, delicate, or easily broken.
Example
Old age often comes with physical frailty.
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 /ˈfɔːrθˌraɪt/

forthright

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

fictitious

Meaning
not real or true; imaginary or fabricated
Example
The story he told was entirely fictitious.
C1 adjective/noun /fəˈrɛns.ɪk/

forensic

Meaning
Scientific analysis applied to criminal or legal matters
Example
Forensic experts analyze cybercrimes using advanced tools.
C1 noun /ˈfʊtˌnoʊt/

foot-note

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.
C1 verb /ˈfɔːltər/

falter

Meaning
to hesitate or lose strength or momentum
Example
Her voice faltered as she delivered the speech.
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 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 adjective /ˈfænsiːd/

fancied

Meaning
imagined, desired, or believed without evidence
Example
He is a fancied suitor in the eyes of the young lady.
C1 noun /fruːˈɡæl.ə.ti/

frugality

Meaning
The quality of being economical in use or expenditure; not wasteful.
Example
Frugality is essential for saving money effectively.
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 /ˈfɪʃˌmʌŋ.ɡər/

fishmonger

Meaning
a person or store that sells fish
Example
I bought fresh salmon from the local fishmonger.
C1 noun /fiˈæs.koʊ/

fiasco

Meaning
a complete failure, especially a ludicrous or humiliating one
Example
The event turned into a complete fiasco due to poor planning.
C1 adjective /ˈfrɛn.zid/

frenzied

Meaning
Wildly excited or uncontrolled
Example
The frenzied crowd cheered as the band took the stage.
C1 adjective /ˈfrɪvələs/

frivolous

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

filth

Meaning
dirty or disgusting matter; moral corruption
Example
The streets were full of filth after the storm.
C1 noun /ˈfjuː.tʃə.rɪst/

futurist

Meaning
A person who studies or predicts the future, especially trends in science, technology, or society.
Example
The futurist predicted major changes in transportation within the next decade.
C1 noun /ˈfɔːls.hʊd/

Falsehood

Meaning
the state of being untrue; a lie
Example
The politician was caught spreading falsehoods about his opponent.
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 adjective /ˈfrɪdʒɪd/

Frigid

Meaning
extremely cold; freezing; icy
Example
The frigid weather made it difficult to go outside.
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 noun ˈfæl.ə.si

fallacy

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

feud

Meaning
a prolonged and bitter quarrel or conflict, often between families or groups
Example
The two families have been in a feud for generations.
C1 verb /ˈfrɒlɪk/

frolic

Meaning
to play and move about cheerfully, energetically, or playfully
Example
The children frolicked in the garden all afternoon.
C1 verb /flɑp/

flop

Meaning
to fall or move heavily and clumsily; to fail completely
Example
The new movie flopped at the box office.
C1 verb /ˈfɪdʒɪt/

fidget

Meaning
to make small movements, especially because of nervousness or impatience
Example
The child began to fidget during the long lecture.
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 adjective /ˌfɑːrˈfetʃt/

farfetched

Meaning
unlikely to happen or be true; improbable
Example
His explanation for being late sounded farfetched.
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 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 adjective ˈfjuː.taɪl

futile

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

fairgrounds

Meaning
A designated area where fairs, exhibitions, and amusement events are held
Example
The town set up rides and stalls at the fairgrounds for the annual festival.
C1 adjective /ˈflæɡɪŋ/

flagging

Meaning
becoming tired, weaker, or less enthusiastic
Example
After hours of work, his energy was flagging.
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 noun /ˈfjʊərɔːr/

furor

Meaning
An outbreak of public anger or excitement.
Example
The politician's remarks created a furor in the media.
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 /ˈfjuː.dʒə.tɪv/

Fugitive

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.
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 noun /ˈfɔː.nə/

fauna

Meaning
The animal life of a particular region, habitat, or geological period.
Example
The fauna of the African savannah includes lions and elephants.
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 verb /ˈfɔːlsɪfaɪ/

falsify

Meaning
to make something false or to misrepresent
Example
He tried to falsify the documents to avoid taxes.
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 /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 /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 verb /ˈflɪk.ər/

flicker

Meaning
to shine unsteadily or waver between light and dark
Example
The candle flickered in the wind.
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 /ˈfrek.əl/

Freckle

Meaning
a small brownish spot on the skin, often becoming more pronounced through exposure to the sun
Example
Her face was covered with cute freckles that appeared every summer.
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 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 /ˈfleɪɡrənt/

flagrant

Meaning
shockingly noticeable or evident; glaringly wrong
Example
It was a flagrant violation of the rules.
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 adjective /freɪl/

frail

Meaning
Physically weak and delicate.
Example
The old man was too frail to walk without help.
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 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 /ˌfɑːrˈfɛtʃt/

far-fetched

Meaning
unlikely to happen or be true; improbable
Example
His explanation for being late was a bit far-fetched.
C1 noun /fruˈɪʃən/

fruition

Meaning
The realization or fulfillment of a plan, project, or desire.
Example
Her dream of becoming a doctor finally came to fruition.
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 /ˈflɪmzi/

flimsy

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

foreshadow

Meaning
To indicate or suggest something that will happen in the future
Example
Dark clouds foreshadowed an approaching storm.
C1 adverb /ˈfɜː.vənt.li/

Fervently

Meaning
with passionate intensity; ardently; with great emotion or enthusiasm
Example
She fervently hoped that her dreams would come true.
C1 adjective /ˈfiːzəbl/

feasible

Meaning
possible to do easily or conveniently; practical and workable
Example
It is feasible to complete the project within two months.
C1 verb /fɔrˈstɔl/

forestall

Meaning
to prevent by acting in advance; to anticipate and counter
Example
They forestalled the crisis by taking immediate action.
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 adjective /ˈfɪɡərətɪv/

figurative

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

forgery

Meaning
the crime of making fake documents, money, or artworks
Example
The bank detected a forgery in the signature on the cheque.
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 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 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 /ˈflæt.ər.i/

Flattery

Meaning
excessive and insincere praise, given especially to further one's own interests
Example
His constant flattery made everyone suspicious of his true motives.
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 /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 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 adjective fæsˈtɪd.i.əs

fastidious

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

fateful

Meaning
having significant or disastrous consequences
Example
Their fateful decision changed the course of history.
C1 noun /frɪˈvɒləti/

frivolity

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

ford

Meaning
A shallow place in a river where one can cross; to cross a river at such a place.
Example
The travelers decided to ford the river at dawn.
C1 noun/verb /ˈfʌrəʊ/

furrow

Meaning
A long narrow trench made in the ground by a plow; to make wrinkles or grooves.
Example
The farmer plowed furrows in the field.
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 noun ˈfɔː.saɪt

foresight

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.
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 noun /ˈfɔːrˌrʌnər/

forerunner

Meaning
A person or thing that comes before another; a predecessor or harbinger.
Example
The Wright brothers were the forerunners of modern aviation.
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 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 /ˈfɪs.kəl/

fiscal

Meaning
Relating to government revenue, especially taxes, or public money management.
Example
The government introduced new fiscal policies to control inflation.
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 verb /fɔːˈbɛər/

forbear

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