flag-officer
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C2 noun /ˈflæɡ ˌɒfɪsər/

flag-officer

Meaning
a senior naval officer entitled to fly a flag to mark the command
Example
The flag-officer reviewed the fleet before the ceremony.
C2 noun /ˈflɛkʃən/

flection

Meaning
The act of bending or the state of being bent, especially of a limb or joint.
Example
The doctor tested the patient's knee flection during the examination.
C2 noun /ˈflætʃələns/

flatulence

Meaning
the accumulation of gas in the digestive system; excessive gas in the stomach or intestines
Example
Eating beans can sometimes cause flatulence.
C2 adjective /fɪˈdjuːʃəl/

fiducial

Meaning
based on trust or confidence; serving as a standard of reference
Example
The fiducial point on the map ensures accurate measurements.
C2 verb /fɔːrˈfɛnd/

forfend

Meaning
to protect or defend against something undesirable; to prevent
Example
May good fortune forfend any danger from our journey.
C2 noun /ˈfetiʃ/

fetich

Meaning
an object believed to have magical powers or to be inhabited by a spirit
Example
The villagers treated the statue as a powerful fetich.
C2 adjective /ˈfɪnɪki/

finicky

Meaning
difficult to please; very particular about details
Example
He is so finicky about his food that he only eats organic vegetables.
C2 noun /ˌfjuːzɪˈleɪd/

fusillade

Meaning
A series of shots fired or missiles thrown all at the same time or in quick succession.
Example
The soldiers advanced under a fusillade of bullets.
C2 noun /ˈfʌriər/

furrier

Meaning
A person who prepares or deals in furs.
Example
The furrier displayed fine coats in his shop.
C2 noun /fɪntʃ/

finch

Meaning
a small songbird with a short, stout bill
Example
A colorful finch perched on the branch singing sweetly.
C2 noun /fɔːrˈbɛrəns/

forbearance

Meaning
Patient self-control; restraint and tolerance, especially in difficult situations.
Example
She showed remarkable forbearance during the heated argument.
C2 verb /flɪt/

flit

Meaning
to move quickly and lightly from one place to another
Example
Butterflies flitted from flower to flower.
C2 adjective /ˈfʌŋɡəs/

fungous

Meaning
relating to or resembling a fungus
Example
The damp basement had a fungous smell.
C2 verb /fleɪ/

flay

Meaning
to strip off the skin of something or criticize severely
Example
The chef flayed the fish before cooking it.
C2 verb /ˈfrʌktɪˌfaɪ/

fructify

Meaning
To make fruitful or productive; to bear fruit.
Example
The new policies will help fructify the economic potential of the region.
C2 noun /ˈfjʊr.ʌŋ.kəl/

Furuncle

Meaning
a painful pus-filled bump under the skin caused by infected, inflamed hair follicles
Example
The doctor prescribed antibiotics to treat the painful furuncle on his neck.
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.
C2 noun /floʊ/

floe

Meaning
a large sheet of floating ice
Example
The polar bears rested on the ice floe.
C2 adjective /ˈfæð.əm.ləs/

fathomless

Meaning
impossible to understand or measure; very deep
Example
The ocean seemed fathomless as it stretched to the horizon.
C2 noun /fluːk/

fluke

Meaning
A stroke of luck; an unexpected piece of good fortune.
Example
Winning the lottery was a complete fluke.
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.
C2 noun /fiːˈkʌndɪti/

fecundity

Meaning
the ability to produce an abundance of offspring or new growth; fertility
Example
The fecundity of the river delta supports diverse wildlife.
C2 noun /ˈfrɛʃɪt/

freshet

Meaning
A sudden overflow of a stream or river caused by heavy rain or melting snow.
Example
After the storm, the river turned into a raging freshet.
C2 adjective /ˈfluːtɪd/

fluted

Meaning
having grooves or ridges, often for decoration
Example
The vase had a beautiful fluted design around the rim.
C2 noun /ˈfɔːrˌpiːk/

forepeak

Meaning
The compartment in the forward part of a ship, often used for storage.
Example
The sailors stored extra ropes in the forepeak.
C2 adjective /ˈfædɪʃ/

faddish

Meaning
Following a temporary trend or fashion
Example
Wearing neon clothes was a faddish style in the 1980s.
C2 verb /ˈfʌdəl/

fuddle

Meaning
To confuse or stupefy, especially with alcohol or overwhelming information.
Example
The complicated instructions fuddled the new employees.
C2 adjective /ˈfæl.oʊ/

fallow

Meaning
Describing land that is left unplanted for a period to restore its fertility, allowing soil to recover nutrients and break pest and disease cycles.
Example
Farmers leave their fields fallow to restore soil fertility.
C2 verb /frɪsk/

frisk

Meaning
To search a person by patting their clothing to check for concealed items.
Example
The security guard frisked the man at the entrance.
C2 verb /ˈfjuːmɪˌɡeɪt/

fumigate

Meaning
to disinfect or purify an area by using chemical fumes
Example
They fumigated the warehouse to kill the insects.
C2 adjective /ˈfuːlˌhɑːrdi/

foolhardy

Meaning
Recklessly bold or rash; taking foolish risks.
Example
It was foolhardy of him to climb the mountain without proper gear.
C2 noun /ˈfɜːrnəri/

fernery

Meaning
a place or greenhouse where ferns are cultivated
Example
The garden's fernery was full of exotic plants.
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.
C2 adjective /ˈfiːbəlˌmaɪndɪd/

feebleminded

Meaning
lacking intelligence or mental capacity; foolish or weak-minded
Example
The feebleminded man struggled to understand basic instructions.
C2 adjective /fluːˈɛnʃəl/

fluential

Meaning
Having the power to influence or flowing freely (rare/archaic usage).
Example
The fluential speaker captivated the entire audience.
C2 adjective /ˈfækʃəs/

factious

Meaning
causing disagreement or division within a group; inclined to form factions
Example
The debate became factious, splitting the committee into rival camps.
C2 noun /flɔːˈrɛsəns/

florescence

Meaning
The process, state, or period of flowering.
Example
The garden reached its peak florescence in spring.
C2 noun /ˈfɒpəri/

foppery

Meaning
Foolish or excessive concern with one's appearance or manners; pretentious behavior.
Example
His obsession with fashion was dismissed as mere foppery.
C2 verb /ˈfæmɪʃ/

famish

Meaning
to suffer or cause to suffer from extreme hunger
Example
The stranded hikers began to famish after several days without food.
C2 noun /ˈfʌŋkʃəˌnɛri/

functionary

Meaning
a person who has official duties in an organization, especially one with little authority
Example
The minor functionary was responsible for filing reports.
C2 verb /fɪˈneɪɡəl/

finagle

Meaning
to obtain something by cleverness or trickery
Example
He finagled a free ticket by pretending to be a VIP guest.
C2 noun /ˈfɔːrˌnɑːlɪdʒ/

foreknowledge

Meaning
Awareness of something before it happens or exists.
Example
The prophet claimed to have foreknowledge of the event.
C2 verb /ˌfɔːrɔːrˈdeɪn/

foreordain

Meaning
to determine or decree something in advance; to predestine
Example
Some believe that our lives are foreordained by fate.
C2 noun /foʊ ˈpɑː/

faux pas

Meaning
a social blunder or mistake in etiquette
Example
He committed a major faux pas by forgetting her birthday.
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.
C2 noun /frɒnd/

frond

Meaning
A large, divided leaf of a fern, palm, or similar plant.
Example
The fern's frond stretched gracefully over the garden path.
C2 noun /ˈfoʊ.li.oʊ/

folio

Meaning
A sheet of paper folded once to form two leaves (four pages) of a book; also a term for a large book or manuscript.
Example
The library houses an ancient Shakespeare folio.
C2 adjective /ˈfɛkləs/

feckless

Meaning
lacking initiative or strength of character; irresponsible
Example
His feckless attitude at work caused several missed deadlines.
C2 verb /fleɪl/

flail

Meaning
to wave or swing something about wildly; to thrash about
Example
He flailed his arms to keep afloat in the water.
C2 noun /ˈfræŋkɪnsɛns/

frankincense

Meaning
An aromatic gum resin used in incense and perfumes, often in religious ceremonies.
Example
The temple was filled with the sweet smell of burning frankincense.
C2 verb /fɔɪst/

foist

Meaning
To impose something unwelcome or unnecessary on someone.
Example
He tried to foist his old books onto his friends.
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 adjective /ˈfætʃuəs/

fatuous

Meaning
silly or foolish, especially in a self-satisfied way
Example
His fatuous comments during the meeting annoyed everyone.
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.
C2 adjective /ˈfraɪəbl/

friable

Meaning
Easily crumbled or reduced to powder.
Example
The old brick wall was friable and broke apart at a touch.
C2 adjective /ˈfrɒlɪksəm/

Frolicsome

Meaning
joyful; playful; merry; cheerful
Example
The frolicsome children laughed and played in the park.
C2 adjective /ˈfrɒθi/

frothy

Meaning
Full of or covered with small bubbles; light and insubstantial.
Example
She ordered a cup of frothy cappuccino.
C2 adjective /ˈfɛtɪd/

fetid

Meaning
having a strong, unpleasant smell
Example
The fetid smell from the garbage was unbearable.
C2 adjective fɔːˈtjuː.ɪ.təs

fortuitous

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

foxy

Meaning
Clever, cunning, or attractive.
Example
He came up with a foxy plan to win the game.
C2 adjective /fəˈloʊniəs/

felonious

Meaning
relating to or involved in serious criminal activity
Example
He was charged with felonious assault after the incident.
C2 noun /fækˈtoʊtəm/

factotum

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.
C2 verb /ˈfɜːrbɪʃ/

furbish

Meaning
to polish, renovate, or give a fresh look to something
Example
The workers furbished the old sword until it gleamed like new.
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.
C2 adjective /ˈfiːkənd/

fecund

Meaning
producing or capable of producing an abundance of offspring or new growth; fertile
Example
The fecund soil produced a bountiful harvest this year.
C2 adjective /ˈfrɪski/

Frisky

Meaning
lively; energetic; playful; mischievous
Example
The frisky puppy ran around the garden playfully.
C2 adjective /ˈfʊl.səm/

fulsome

Meaning
Excessively flattering or insincere; abundant or generous in amount.
Example
He offered fulsome praise to his boss.
C2 adjective/adverb /feɪn/

fain

Meaning
gladly, willingly, or with pleasure
Example
I would fain help you if I had the time.
C2 noun /ˈfɪli/

filly

Meaning
a young female horse
Example
The filly ran swiftly across the meadow.
C2 adjective /fjuːˈɡeɪʃəs/

fugacious

Meaning
Lasting only a short time; fleeting or ephemeral.
Example
Youth is beautiful but fugacious.
C2 noun /ˈfaɪnəri/

finery

Meaning
expensive or elaborate clothes, decorations, or accessories
Example
She attended the party in her finest finery.
C2 noun /flɛk/

fleck

Meaning
a small spot or mark, often of a different color
Example
There was a fleck of paint on the floor.
C2 noun /ˈfæn.feər/

fanfare

Meaning
a short ceremonial tune or display of publicity to attract attention
Example
The new product was launched with much fanfare.
C2 noun /ˈfuːləri/

foolery

Meaning
Silly or foolish behavior or actions.
Example
His constant foolery made the meeting hard to take seriously.
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 adjective /ˈfjuːzəbl/

fusible

Meaning
Capable of being melted or fused.
Example
The engineer used a fusible alloy in the experiment.
C2 noun /ˈfiːæt/

fiat

Meaning
an official order or decree; authoritative command
Example
The new policy was enacted by royal fiat.
C2 adjective /ˈfluːviəl/

fluvial

Meaning
relating to or found in a river
Example
The fluvial deposits indicated the presence of an ancient river system.
C2 adjective /ˈfæləbl/

fallible

Meaning
capable of making mistakes or being wrong
Example
Even experts are fallible and can make errors.
C2 adjective /ˈflæs.ɪd/

Flaccid

Meaning
soft and limp; lacking firmness; drooping
Example
The plant's leaves became flaccid after days without water.
C2 adjective /ˈflæb.i/

Flabby

Meaning
soft and loose; lacking firmness or muscle tone; weak
Example
His flabby arms showed he needed to exercise more.
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.
C2 noun /ˈfrɔːdjʊləns/

fraudulence

Meaning
The quality or state of being fraudulent; deceitfulness.
Example
The audit revealed fraudulence in the financial statements.
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.
C2 noun /ˈfɔːltˌfaɪndər/

faultfinder

Meaning
a person who habitually finds fault with others
Example
He is such a faultfinder that nothing anyone does is ever good enough.
C2 noun /ˈflɪpənsi/

flippancy

Meaning
lack of seriousness; showing a disrespectful or trivial attitude
Example
His flippancy during the meeting offended his colleagues.
C2 noun ˌfjuːmɪˈɡeɪʃən

fumigation

Meaning
The practice of disinfecting or purifying an area using gas or smoke.
Example
Fumigation is an effective method to control pest infestations.
C2 adjective /ˈfʊtˌluːs/

footloose

Meaning
Free to go anywhere or do anything; not tied down by responsibilities.
Example
After graduating, he felt footloose and ready to explore the world.
C2 adjective /ˈfiːtɪd/

foetid

Meaning
having an offensive, unpleasant smell
Example
The foetid smell from the garbage made it hard to breathe.
C2 noun /ˈflɛdʒlɪŋ/

fledgeling

Meaning
A young bird that has just developed its feathers and is learning to fly; a beginner.
Example
The fledgeling was trying hard to take its first flight.
C2 adjective /ˈfɒp.ɪʃ/

Foppish

Meaning
excessively concerned with one's appearance and clothes; vain about dress
Example
His foppish behavior and expensive clothes made him stand out.
C2 noun /friːz/

frieze

Meaning
a decorative horizontal band, often sculpted or painted, usually on a wall near the ceiling
Example
The frieze above the entrance depicts scenes from ancient mythology.
C2 noun /fɔːn/

faun

Meaning
a mythological creature that is half human and half goat
Example
The sculpture depicted a playful faun dancing in the forest.
C2 noun /ˈflɒtsəm/

flotsam

Meaning
Floating debris from a shipwreck or things discarded and left floating.
Example
The beach was littered with flotsam after the storm.
C2 adverb /ˈfɔːrbi/

forby

Meaning
In addition; besides (archaic Scottish/English word).
Example
He is kind and generous, and wise forby.
C2 noun /ˌfɔːrɔːrdɪˈneɪʃən/

foreordination

Meaning
the act of determining something in advance; predestination
Example
The doctrine of foreordination suggests that events are fixed by divine will.
C2 adjective /ˈfʊl.dʒənt/

fulgent

Meaning
Shining brightly; dazzling.
Example
The fulgent stars lit up the night sky.
C2 noun /ˈfrɛs.koʊ/

fresco

Meaning
A painting done rapidly in watercolor on wet plaster so that the colors penetrate the surface
Example
The church walls were decorated with beautiful frescoes.
C2 adjective /fækˈtɪʃəs/

factitious

Meaning
artificial or fabricated; not natural or genuine
Example
The excitement in his story seemed factitious and forced.
C2 noun /ˈfɔːθ.raɪt.nəs/

forthrightness

Meaning
The quality of being honest and straightforward; directness.
Example
Her forthrightness made her a respected journalist.
C2 noun /flæks/

flax

Meaning
a plant whose fibers are used to make linen and whose seeds are edible
Example
Flax is often used in making linen fabrics.
C2 adjective /ˈfʌndʒəbl/

fungible

Meaning
interchangeable; able to replace or be replaced by another identical item
Example
In finance, money is considered a fungible asset.
C2 noun /fləˈtɪlə/

flotilla

Meaning
A small fleet of ships or boats operating together.
Example
A flotilla of fishing boats left the harbor at dawn.
C2 noun /ˈfɪlɪɡri/

filigree

Meaning
delicate ornamental work of fine wire, usually of gold or silver
Example
The necklace was decorated with intricate gold filigree.
C2 adjective /ˈfæsaɪl/

Facile

Meaning
easily achieved; superficial; lacking depth
Example
His facile explanation didn't address the real problem.
C2 noun /ˈfɔːrˌseɪl/

foresail

Meaning
The principal sail set on the foremast of a sailing vessel.
Example
The crew adjusted the foresail to catch the wind.
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.
C2 noun /ˈfɜːrðərəns/

furtherance

Meaning
The advancement or promotion of something.
Example
The new policy was introduced in furtherance of social justice.
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 /ˈflaɪti/

flighty

Meaning
unstable, impulsive, or easily distracted; lacking seriousness or stability
Example
She’s too flighty to stick with one job for long.
C2 verb /ˈfʊl.mɪ.neɪt/

fulminate

Meaning
To express strong protest or criticism loudly and forcefully; to explode violently.
Example
The politician began to fulminate against corruption.
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.
C2 adjective /ˈfraʊzi/

frowsy

Meaning
Scruffy and neglected in appearance; musty or stale in smell.
Example
He wore a frowsy old jacket that smelled of damp.
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 verb /ˈfɒn.dəl/

fondle

Meaning
To stroke or caress lovingly or gently.
Example
She fondled the kitten gently in her lap.
C2 adjective/noun /fɪˈduː.ʃi.er.i/

fiduciary

Meaning
Involving trust, especially with regard to the relationship between a trustee and a beneficiary.
Example
Banks have fiduciary duties towards their clients.
C2 noun /ˈfeɪ.tə.lɪ.zəm/

fatalism

Meaning
the belief that all events are predetermined and inevitable
Example
He embraced fatalism, believing that nothing he did could change his destiny.
C2 noun /ˈfiːəlti/

fealty

Meaning
loyalty or allegiance, especially to a sovereign or lord
Example
The knight swore fealty to his king.
C2 adjective /fjuːˈnɪəriəl/

funereal

Meaning
having the mournful, somber character of a funeral
Example
The room was filled with a funereal silence after the announcement.
C2 noun /feɪnt/

feint

Meaning
a deceptive or pretended movement, especially in fighting or sports
Example
The boxer made a feint to the left before striking to the right.
C2 adjective /ˈflʌməksd/

flummoxed

Meaning
Completely confused or bewildered.
Example
He looked flummoxed after hearing the strange question.