frigidarium
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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 noun /ˈfʌstɪən/

fustian

Meaning
pompous or pretentious speech or writing; originally a type of thick cloth
Example
The politician's speech was filled with fustian and empty promises.
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 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 verb /fɔɪst/

foist

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

flotilla

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

fernery

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

fitful

Meaning
occurring in irregular bursts; not continuous or steady
Example
He had a fitful sleep due to the storm.
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 noun /foʊl fʊt/

Foal-foot

Meaning
a yellow flowering plant with leaves shaped like a horse's hoof, also known as coltsfoot
Example
The foal-foot plant grows wild in many meadows and is often the first flower to bloom in spring.
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 /fɪntʃ/

finch

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

fawning

Meaning
displaying exaggerated flattery or affection
Example
Her fawning compliments made everyone uncomfortable.
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 noun /ˈfɜːrðərəns/

furtherance

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

fete

Meaning
a celebration or festival, often in honor of someone
Example
The village held a grand fete to celebrate the harvest.
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 noun /fɔːrˈbɛrəns/

forbearance

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

froward

Meaning
Difficult to deal with; contrary and disobedient.
Example
The teacher found the froward child hard to manage.
C2 noun /floʊ/

floe

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

faddish

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

fuddle

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

figment

Meaning
something invented or imaginary; a fabrication of the mind
Example
The story of the haunted house is just a figment of her imagination.
C2 adjective /ˈfɛtɪd/

fetid

Meaning
having a strong, unpleasant smell
Example
The fetid smell from the garbage was unbearable.
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 noun /ˈfɔːrʃɔːr/

foreshore

Meaning
The part of the shore between the high and low tide marks
Example
Children were playing on the foreshore, collecting shells.
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 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 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 adjective /ˈfʊl.dʒənt/

fulgent

Meaning
Shining brightly; dazzling.
Example
The fulgent stars lit up the night sky.
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 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 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 /fluː/

flue

Meaning
A pipe or channel for smoke and waste gases produced by a fire, gas heater, or power station.
Example
The chimney flue needs to be cleaned regularly.
C2 verb /flɪt/

flit

Meaning
to move quickly and lightly from one place to another
Example
Butterflies flitted from flower to flower.
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/adverb /feɪn/

fain

Meaning
gladly, willingly, or with pleasure
Example
I would fain help you if I had the time.
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 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 adjective /ˈfrɒθi/

frothy

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

foolhardy

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

fretful

Meaning
Feeling or showing distress or irritation.
Example
The baby was fretful all night and could not sleep.
C2 adjective /ˈfæləbl/

fallible

Meaning
capable of making mistakes or being wrong
Example
Even experts are fallible and can make errors.
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 /ˈfiːbəlˌmaɪndɪd/

feebleminded

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

fulcrum

Meaning
The point or support on which a lever pivots; a central or essential point of activity or support.
Example
The teacher became the fulcrum of change in the school.
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.
C2 noun /ˈfiːæt/

fiat

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

Facile

Meaning
easily achieved; superficial; lacking depth
Example
His facile explanation didn't address the real problem.
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 adjective /ˈfræk.ʃəs/

Fractious

Meaning
irritable and quarrelsome; difficult to control; bad-tempered
Example
The fractious child refused to follow any of the teacher's instructions.
C2 adjective /ˈflʌməksd/

flummoxed

Meaning
Completely confused or bewildered.
Example
He looked flummoxed after hearing the strange question.
C2 adjective /ˈfɪliəl/

filial

Meaning
relating to a son or daughter; showing respect or affection toward parents
Example
He showed filial respect by caring for his aging parents.
C2 noun /ˈfuːləri/

foolery

Meaning
Silly or foolish behavior or actions.
Example
His constant foolery made the meeting hard to take seriously.
C2 adjective /ˈfrɒlɪksəm/

Frolicsome

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

flummox

Meaning
To confuse or bewilder someone completely.
Example
The complicated puzzle flummoxed the students.
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 /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 adjective /fəˈloʊniəs/

felonious

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

fulsome

Meaning
Excessively flattering or insincere; abundant or generous in amount.
Example
He offered fulsome praise to his boss.
C2 noun, verb /ˈfɪlɪˌbʌstər/

filibuster

Meaning
a tactic of delaying legislative action by prolonged speech; to use such a tactic
Example
The senator filibustered for hours to prevent the bill from passing.
C2 verb /ˈfɛtər/

fetter

Meaning
to restrain or restrict someone’s freedom
Example
The strict rules fettered the creativity of the students.
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 /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 noun /ˈfriːˌmeɪsən/

freemason

Meaning
A member of an international fraternity known as Freemasonry, focused on moral and spiritual values.
Example
His grandfather was a respected freemason in the community.
C2 verb /fɔːrˈboʊd/

forebode

Meaning
To predict or have a strong inner feeling of a future misfortune or evil.
Example
Dark clouds forebode a coming storm.
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 /ˈfɔɪbəl/

foible

Meaning
A minor weakness or eccentricity in someone's character.
Example
She loved him despite his little foibles.
C2 noun /fækˈsɪmɪli/

facsimile

Meaning
an exact copy or reproduction of a document
Example
He sent a facsimile of the contract to the client.
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 /ˈfiːtɪd/

foetid

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

fungous

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

fugacious

Meaning
Lasting only a short time; fleeting or ephemeral.
Example
Youth is beautiful but fugacious.
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 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 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 /ˈfer.əs/

ferrous

Meaning
containing or consisting of iron
Example
Ferrous metals are commonly used in construction.
C2 adjective /ˈfɒksi/

foxy

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

Flaccid

Meaning
soft and limp; lacking firmness; drooping
Example
The plant's leaves became flaccid after days without water.
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 /ˈflæt.ər.ər/

Flatterer

Meaning
a person who lavishes praise, often insincerely and in order to gain advantage
Example
The king was surrounded by flatterers who only told him what he wanted to hear.
C2 adjective /ˈfɛkləs/

feckless

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

finery

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

factitious

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

fealty

Meaning
loyalty or allegiance, especially to a sovereign or lord
Example
The knight swore fealty to his king.
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 noun /ˈfoʊksl/

forecastle

Meaning
The forward part of a ship below the deck, traditionally used as living quarters for the crew.
Example
The sailors gathered in the forecastle after their shift.
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 adjective /ˈfæn.sɪ.ləs/

fanciless

Meaning
without imagination or creativity; plain or ordinary
Example
His drawings were simple and fanciless.
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 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 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 adjective /ˈfætʃuəs/

fatuous

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

forthrightness

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

Fervid

Meaning
passionate; intensely enthusiastic; burning with emotion
Example
She gave a fervid speech about environmental protection.
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 adjective /ˈfjuːzəbl/

fusible

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

furrier

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

forecourt

Meaning
an open area in front of a large building, especially a petrol station or hotel
Example
The car was parked in the hotel forecourt.
C2 verb /fɔːrˈdʒʌdʒ/

forejudge

Meaning
To judge beforehand without adequate information.
Example
It is unfair to forejudge someone without knowing the facts.
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 /fəˈlɪsɪtəs/

felicitous

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