fluctuation
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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 /frəˈdʒɪl.ɪ.ti/

fragility

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

frivolous

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

fungus

Meaning
a spore-producing organism feeding on organic matter, including molds, yeast, and mushrooms
Example
A strange fungus was growing on the old tree.
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 /ˈfɛtɪʃ/

fetish

Meaning
an excessive or irrational devotion to something
Example
He has a fetish for collecting rare stamps.
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 /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 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 /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 adjective /ˈflʌstərd/

flustered

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

foyer

Meaning
An entrance hall or lobby in a building.
Example
The guests waited in the hotel foyer before checking in.
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 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 /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 /ˈfoʊliɪdʒ/

foliage

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

filth

Meaning
dirty or disgusting matter; moral corruption
Example
The streets were full of filth after the storm.
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 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 /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 verb /ˈfʌmbəl/

fumble

Meaning
to handle something clumsily or to make mistakes while doing something
Example
He fumbled with the keys and dropped them on the floor.
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 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 /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 verb /fɔːrˈɡoʊ/

forgo

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

fancier

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.
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 /ˈfeɪt.fəl/

fateful

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

forthright

Meaning
Direct and honest in speech or behavior; straightforward.
Example
She was forthright in her criticism of the policy.
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 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 ˈfɜːr.vɚ

fervor

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

frenzied

Meaning
Wildly excited or uncontrolled
Example
The frenzied crowd cheered as the band took the stage.
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 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 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 adjective fæsˈtɪd.i.əs

fastidious

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

farfetched

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

forethought

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.
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 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 /fɔːrˈʃædoʊ/

foreshadow

Meaning
To indicate or suggest something that will happen in the future
Example
Dark clouds foreshadowed an approaching storm.
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 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 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 /ˌfɪɡjʊˈriːn/

figurine

Meaning
a small ornamental statue or model of a human or animal
Example
She bought a porcelain figurine of a dancing ballerina.
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 adjective /ˈfleɪɡrənt/

flagrant

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

foe

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

fanciful

Meaning
overimaginative, unrealistic, or whimsical
Example
The story was too fanciful to be true.
C1 adjective /ˈflæɡɪŋ/

flagging

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

Frigid

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

fleeting

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

Faction

Meaning
a small organized dissenting group within a larger one
Example
Different factions within the party disagreed about the new policy.
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 ˈfæl.ə.si

fallacy

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

feign

Meaning
to pretend or fake; to give a false appearance of
Example
She feigned illness to avoid going to work.
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 /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/verb ˈfɒr.ɪdʒ

forage

Meaning
Food for horses and cattle, especially dried hay or feed; to search for food.
Example
Animals forage for food during the winter months.
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 /fəˌsɪlɪˈteɪʃən/

facilitation

Meaning
The action of facilitating or making an action or process easier or helping bring about an outcome.
Example
Her facilitation made the meeting run smoothly.
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 /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 /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 adjective ˈfæʃ.ɪst

fascist

Meaning
Relating to or characteristic of fascism; extremely authoritarian.
Example
Fascist governance undermines freedom.
C1 noun/adjective ˈflɛdʒ.lɪŋ

fledgling

Meaning
New, inexperienced, newly established.
Example
The fledgling startup needs investment.
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 /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 verb, noun /ˈflʌstər/

fluster

Meaning
to make someone agitated or confused
Example
The unexpected question flustered him.
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 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 /ˈfjʊərɔːr/

furor

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

fragmented

Meaning
Having been broken into fragments; disjointed or incomplete.
Example
The information was fragmented and difficult to understand.
C1 adjective /ˈfaɪ.naɪt/

Finite

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

firearm

Meaning
a weapon capable of firing a projectile using gunpowder or other propellant
Example
The police found a hidden firearm during the investigation.
C1 noun/adjective /fɔːrˈboʊdɪŋ/

foreboding

Meaning
A feeling that something bad will happen; ominous.
Example
She felt a deep sense of foreboding as she entered the abandoned house.
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 /frɔːt/

fraught

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

fad

Meaning
a temporary fashion or trend; a short-lived craze
Example
The new diet became a popular fad among teenagers.
C1 noun /ˈfɪʃˌmʌŋ.ɡər/

fishmonger

Meaning
a person or store that sells fish
Example
I bought fresh salmon from the local fishmonger.
C1 noun ˌfræɡ.mənˈteɪ.ʃən

fragmentation

Meaning
The process or state of breaking or being broken into fragments.
Example
Habitat fragmentation threatens many species.
C1 adjective /ˈfɑːð.ər.ləs/

fatherless

Meaning
without a father
Example
The fatherless child relied on the support of his community.
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 adjective ˈfjuː.taɪl

futile

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

Fiery

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

frolic

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

fret

Meaning
to worry or be anxious; to be troubled
Example
Don't fret about the exam results.
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 + noun ˈfeɪvərəbəl klaɪˈmætɪk kənˈdɪʃənz

favorable climatic conditions

Meaning
Weather conditions that are suitable and beneficial for growth or development
Example
Winter offers favorable climatic conditions for farming.
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 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 /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 /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 /ˈfreɪlti/

frailty

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