fail-safe
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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 /ˈfɔːrdʒəri/

forgery

Meaning
the crime of making fake documents, money, or artworks
Example
The bank detected a forgery in the signature on the cheque.
C2 adjective /ˈflɒrɪd/

florid

Meaning
Having a red or flushed complexion; or excessively ornate and intricate.
Example
The speaker’s florid style made the lecture hard to follow.
B1 adjective /ˈfrʌstreɪtɪd/

frustrated

Meaning
feeling annoyed or upset because of inability to achieve something
Example
She felt frustrated after failing the exam.
C2 verb /ˈflædʒəˌleɪt/

flagellate

Meaning
to whip or flog someone, either literally or as a form of punishment or self-discipline
Example
In history, some monks would flagellate themselves as penance.
C2 adjective /fəˈsiːʃəs/

facetious

Meaning
Treating serious issues with deliberately inappropriate humor
Example
He was being facetious when he said he wanted to live on the moon.
C2 verb /ˌfɔːrˈrʌn/

forerun

Meaning
To go before; to precede in time, place, or action.
Example
Dark clouds often forerun a storm.
A2 adjective /ˈfraɪtənd/

frightened

Meaning
feeling fear or anxiety; scared
Example
The child was frightened by the loud noise.
B2 adverb /ˈfɔ:rmoast/

Foremost

Meaning
most importantly; above all; in the first place
Example
First and foremost, we need to ensure safety.
A2 adjective /ˈflaɪɪŋ/

flying

Meaning
able to move through the air; related to flight or aircraft
Example
The flying bird disappeared into the clouds.
A2 adjective, adverb /ˈfʊl taɪm/

full-time

Meaning
working or studying for the whole standard period of time
Example
She works full-time as a teacher.
A2 noun /ˈfrɛndʃɪp/

friendship

Meaning
A close and trusting relationship between two or more people.
Example
Their friendship has lasted since childhood.
C1 adjective /frɔːt/

fraught

Meaning
Filled with or likely to result in something undesirable.
Example
The negotiations were fraught with tension and uncertainty.
A1 number /ˌfɪfˈtiːn/

fifteen

Meaning
the number 15
Example
There are fifteen students in the class.
B2 adjective /ˈflɔːrəl/

floral

Meaning
Relating to flowers or decorated with flowers.
Example
She wore a beautiful floral dress to the party.
B2 noun /ˈfriːdəm ˌfaɪtər/

freedom fighter

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.
C2 adjective /ˈfrɒlɪksəm/

Frolicsome

Meaning
joyful; playful; merry; cheerful
Example
The frolicsome children laughed and played in the park.
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.
B2 noun /ˈfrɛʃnəs/

freshness

Meaning
The quality of being new, clean, and full of energy.
Example
The freshness of the morning air made everyone feel alive.
C2 adjective /ˈfluːtɪd/

fluted

Meaning
having grooves or ridges, often for decoration
Example
The vase had a beautiful fluted design around the rim.
C1 adverb /ˈfeɪ.təl.i/

Fatally

Meaning
in a way that causes death; with deadly consequences; critically
Example
The accident fatally injured two passengers.
A2 adjective /fəˈmɪl.jər/

Familiar

Meaning
well-known; easily recognized; having knowledge of; informal and friendly
Example
This song sounds familiar to me.
C2 noun /ˈfriːˌθɪŋkər/

freethinker

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.
C1 verb, noun /ˈflʌstər/

fluster

Meaning
to make someone agitated or confused
Example
The unexpected question flustered him.
A1 adjective /fɑːst/

Fast

Meaning
moving or happening quickly; rapid; swift
Example
She runs very fast in the morning.
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.
A1 adverb /fɑːr/

far

Meaning
at, to, or by a great distance
Example
The school is far from my house.
A1 noun /flɔːr/

floor

Meaning
the lower surface of a room, on which one may walk
Example
The floor was covered with a soft carpet.
B2 noun /ˈfleɪvər/

flavor

Meaning
The distinctive taste of a food or drink.
Example
This ice cream has a delicious mango flavor.
C2 noun /ˌfrɪdʒɪˈdɛːriəm/

frigidarium

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.
C2 adjective /ˈfraʊzi/

frowzy

Meaning
Unkempt, messy, or having a musty, unpleasant smell.
Example
He entered the room with a frowzy appearance after sleeping on the couch.
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.
B2 adjective /ˈfʌŋkʃənl/

functional

Meaning
designed to be practical and useful, rather than just decorative
Example
The design of the chair is simple but highly functional.
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.
B2 verb /ˈfæs.ɪ.neɪt/

fascinate

Meaning
to attract and hold the attention of someone; to charm or captivate
Example
The magician's performance fascinated the audience.
C2 noun /ˈfɛndər/

fender

Meaning
a part of a vehicle that frames a wheel well to protect against mud or debris
Example
The car's fender was dented in the accident.
C2 noun /ˈflɪpənsi/

flippancy

Meaning
lack of seriousness; showing a disrespectful or trivial attitude
Example
His flippancy during the meeting offended his colleagues.
C2 adjective fɔːˈtjuː.ɪ.təs

fortuitous

Meaning
Happening by accident or chance rather than design; lucky or fortunate.
Example
Their meeting was purely fortuitous.
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.
C2 verb /ˈfɛstər/

fester

Meaning
to become worse or more intense, often through neglect or infection
Example
If grievances are ignored, they may fester into resentment.
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.
A2 noun /ˈfɔːrɪst/

Forest

Meaning
a large area covered chiefly with trees and undergrowth
Example
We went hiking in the dense forest yesterday.
B2 noun /ˈfluː.ən.si/

fluency

Meaning
The ability to speak or write a language smoothly and effortlessly.
Example
She speaks English with remarkable fluency.
B1 verb /fəʊld/

fold

Meaning
to bend something, especially paper or cloth, so that one part covers another
Example
She folded the letter neatly before placing it in the envelope.
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.
C2 verb /fɪltʃ/

filch

Meaning
to steal something in a sneaky or petty way
Example
He tried to filch a candy bar from the shop.
B2 noun /ˈfjʊr.i/

Fury

Meaning
wild or violent anger; extreme intensity of emotion or activity
Example
His fury was evident when he discovered someone had stolen his bicycle.
C2 adjective /ˈfæn.sɪ.ləs/

fanciless

Meaning
without imagination or creativity; plain or ordinary
Example
His drawings were simple and fanciless.
B2 adjective, verb (present participle) /ˈfloʊtɪŋ/

floating

Meaning
remaining on the surface of a liquid without sinking; moving lightly or freely
Example
The boat was floating gently on the calm lake.
C2 verb /fɔːrˈfɛnd/

forfend

Meaning
to protect or defend against something undesirable; to prevent
Example
May good fortune forfend any danger from our journey.
B2 noun fɪkst ˈɪnkʌm

fixed income

Meaning
Investment that provides a return in the form of fixed periodic payments.
Example
Fixed income investments provide reliable returns.
B2 adjective /ˈfeɪtl/

fatal

Meaning
causing death; leading to disaster
Example
The accident proved fatal for the driver.
C1 adjective /ˈfruːt.ləs/

Fruitless

Meaning
unsuccessful; futile; pointless;
Example
After hours of searching, their efforts proved fruitless.
A2 adjective, adverb /ˈfæstər/

faster

Meaning
moving or able to move quickly; more quickly than usual
Example
This car is faster than the old one.
A2 noun /frɪdʒ/

fridge

Meaning
a household appliance used to keep food and drinks cold to preserve freshness
Example
I put the milk back in the fridge after breakfast.
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.
B1 noun /fəˈsɪl.ɪ.ti/

facility

Meaning
A place, amenity, or piece of equipment provided for a particular purpose.
Example
The facility was well-maintained.
B1 noun /ˈfɔːr.tʃən/

Fortune

Meaning
chance or luck as an external, arbitrary force affecting human affairs; a large amount of money or assets
Example
He made his fortune by investing wisely in technology companies.
C1 noun /fəˈtæləti/

fatality

Meaning
An occurrence of death by accident, disaster, or violence.
Example
The accident resulted in one fatality.
A1 numeral /fɔːr/

four

Meaning
The number equivalent to the sum of two and two; one more than three.
Example
She has four books on her desk.
C2 noun /fiːf/

fief

Meaning
an estate of land held under the feudal system; a domain or area of control
Example
The knight was granted a fief by the lord for his service.
B2 adverb /ˈfɜ:rmli/

Firmly

Meaning
in a strong, steady, and unwavering manner
Example
She firmly believed in her decision.
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.
B2 verb, adjective /ˈfɒstər/

foster

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.
C2 adjective /ˈfʌsti/

fusty

Meaning
smelling stale, damp, or stuffy; old-fashioned
Example
The room smelled fusty after being closed for months.
A1 noun/verb /fɪlm/

film

Meaning
a motion picture or movie; or to record on camera
Example
They watched a film together on the weekend.
C1 adjective /ˈfiːlaɪn/

feline

Meaning
relating to or characteristic of cats
Example
Her movements were graceful and almost feline in their elegance.
A1 noun /fuːd/

food

Meaning
any nutritious substance that people or animals eat or drink to maintain life and growth
Example
Rice is a common food in Asia.
B2 adjective /ˈfraɪtfəl/

frightful

Meaning
causing fear or horror; very unpleasant
Example
The hikers faced frightful weather conditions on the mountain.
A1 adjective /fjuː/

few

Meaning
A small number of; not many.
Example
Only a few students attended the class.
B1 noun, verb /ˈfaɪ.næns/ or /fəˈnæns/

finance

Meaning
the management of money and investments, or to provide funds for something
Example
The company secured finance from a major bank.
A2 adjective /flæt/

flat

Meaning
Smooth and level, without raised areas or curves.
Example
The road ahead was completely flat.
A2 verb /fiːd/

feed

Meaning
to give food to a person or animal
Example
She feeds the birds every morning.
C2 noun /ˌfoʊ.mənˈteɪ.ʃən/

fomentation

Meaning
The action of instigating or stirring up; also the application of warm substances to the body to ease pain.
Example
His speech led to the fomentation of violence in the region.
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 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.
B2 adjective /flɔːd/

flawed

Meaning
having a mistake or fault that reduces its value or quality
Example
The flawed design of the car led to a recall.
B1 adjective /ˈfæbjələs/

Fabulous

Meaning
extremely good; wonderful; extraordinary
Example
She wore a fabulous dress to the party.
B2 noun ˈfrʌn.tɪərz

frontiers

Meaning
The extreme limit of settled land beyond which lies wilderness; the limits of knowledge or achievement in a particular field.
Example
The project pushes the frontiers of space exploration.
C1 noun/adjective ˈflɛdʒ.lɪŋ

fledgling

Meaning
New, inexperienced, newly established.
Example
The fledgling startup needs investment.
B1 noun /ˈfeɪ.vər/

Favour

Meaning
approval, support, or liking for someone or something; a kind or helpful act
Example
Could you do me a favour and help me move this heavy box?
C2 noun /fəˈlɪsɪti/

felicity

Meaning
intense happiness; the ability to find appropriate expression for one's thoughts
Example
She was known for her felicity in conversation and cheerful nature.
A2 adjective /ˈfɔːrən/ or /ˈfɑːrən/

foreign

Meaning
Belonging to or coming from another country.
Example
She loves studying foreign languages.
C1 adjective /ˈflæɡɪŋ/

flagging

Meaning
becoming tired, weaker, or less enthusiastic
Example
After hours of work, his energy was flagging.
B2 noun /ˈfjuː.nər.əl/

Funeral

Meaning
a ceremony typically held shortly after a person's death, usually including burial or cremation
Example
Hundreds of people attended the funeral to pay their respects to the beloved teacher.
C1 noun /foʊ/

foe

Meaning
an enemy or opponent
Example
The knight fought bravely against his foe.
B1 adjective /fɒnd/

fond

Meaning
having a strong liking or affection for something or someone
Example
She is fond of painting and spends hours in front of her canvas.
C1 verb /fɔːˈbɛər/

forbear

Meaning
To refrain from doing something; to show patience or self-control.
Example
She forbore from commenting on his mistake.
C2 noun /ˈfrɔːdjʊləns/

fraudulence

Meaning
The quality or state of being fraudulent; deceitfulness.
Example
The audit revealed fraudulence in the financial statements.
B2 noun /ˈfriː.kwən.si/

Frequency

Meaning
the rate at which something occurs or is repeated over a particular period of time
Example
The frequency of earthquakes in this region has increased dramatically over the past decade.
C1 verb /fɔːrˈʃædoʊ/

foreshadow

Meaning
To indicate or suggest something that will happen in the future
Example
Dark clouds foreshadowed an approaching storm.
C2 verb /foʊˈmɛnt/

foment

Meaning
To instigate or stir up (an undesirable or violent sentiment or course of action).
Example
The rebel leader tried to foment unrest among the people.
C1 adjective /ˈfruː.ɡəl/

Frugal

Meaning
economical; thrifty;
Example
She is very frugal and saves money by buying only necessary items.
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.
C2 verb /ˌfɔːrɔːrˈdeɪn/

foreordain

Meaning
to determine or decree something in advance; to predestine
Example
Some believe that our lives are foreordained by fate.
B2 noun /ˈfækəlti/

faculty

Meaning
an inherent mental or physical ability; a division of a university
Example
She has a remarkable faculty for languages.
C2 noun /ˈfrækɑː/

fracas

Meaning
A noisy disturbance or quarrel.
Example
The fracas outside the bar drew the attention of the police.
B2 adverb /ˈfɜ:rst hænd/

First-hand

Meaning
directly experienced or obtained; from the original source
Example
I experienced the earthquake first-hand.
A2 verb /fraɪ/

fry

Meaning
to cook food in hot oil or fat
Example
She fries eggs for breakfast every morning.
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 ˈfjuː.taɪl

futile

Meaning
Incapable of producing any useful result; pointless.
Example
His attempts to change the situation were futile.
B2 adverb /ˈfeɪθ.fəl.i/

Faithfully

Meaning
in a loyal and steadfast manner; with dedication
Example
She faithfully attended every meeting despite her busy schedule.
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.
A1 noun ˈflaʊərz

Flowers

Meaning
The reproductive structures of plants that provide nectar for butterflies.
Example
Butterflies are attracted to colorful flowers.
B2 adjective /ˈfæktʃuəl/

Factual

Meaning
based on facts; accurate; true
Example
The report contains only factual information.
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 adjective fæsˈtɪd.i.əs

fastidious

Meaning
Very attentive to and concerned about accuracy and detail.
Example
She is fastidious about maintaining cleanliness.
C2 noun /ˈfɜːrnəri/

fernery

Meaning
a place or greenhouse where ferns are cultivated
Example
The garden's fernery was full of exotic plants.
B1 verb /fel/

fell

Meaning
to cut down a tree; to cause to fall; to strike down
Example
The lumberjacks felled several trees in the forest today.
C2 verb /ˈfrɪtər/

fritter

Meaning
To waste time, money, or energy on trivial matters.
Example
He frittered away his savings on unnecessary gadgets.
C2 adjective /ˈfiːbraɪl/

febrile

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.
B1 noun /feɪθ/

Faith

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.
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 /ˈfɑːð.ər.ləs/

fatherless

Meaning
without a father
Example
The fatherless child relied on the support of his community.
B1 noun /ˈfaɪəˌfaɪtə/

firefighter

Meaning
a person whose job is to put out fires
Example
The firefighter saved the family from the burning building.
C2 noun /ˈfriːˌbuːtər/

freebooter

Meaning
A pirate or plunderer who roams freely in search of wealth.
Example
The freebooter raided the merchant ships along the coast.
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.
C2 adjective /fəˈlɪsɪtəs/

felicitous

Meaning
well-chosen, appropriate, or pleasing; marked by good fortune or happiness
Example
She made a felicitous remark that lightened the mood.
C2 noun /fluːk/

fluke

Meaning
A stroke of luck; an unexpected piece of good fortune.
Example
Winning the lottery was a complete fluke.
B2 noun/verb /flɑːk/

flock

Meaning
a group of birds or animals; to gather or move in a crowd
Example
Tourists flocked to the beach during summer.
A1 noun /ˈfæməli/

family

Meaning
A group consisting of parents and their children, or all the descendants of a common ancestor.
Example
She spends most of her weekends with her family.