facet – One of the small triangular plane surfaces of a diamond or other gem.
facetious – Amusing.
facial – Pertaining to the face.
facile – Not difficult to do.
facilitate – To make more easy.
facility – Ease.
facsimile – An exact copy or reproduction.
faction – A number of persons combined for a common purpose.
factious – Turbulent.
fallacious – Illogical.
fallacy – Any unsound or delusive mode of reasoning, or anything based on such reasoning.
fallible – Capable of erring.
fallow – Land broken up and left to become mellow or to rest.
famish – To suffer extremity of hunger or thirst.
fanatic – A religious zealot.
fancier – One having a taste for or interest in special objects.
fanciless – Unimaginative.
fastidious – Hard to please.
fathom – A measure of length, 6 feet.
fatuous – Idiotic
faulty – Imperfect.
faun – One of a class of deities of the woods and herds represented as half human, with goats feet.
fawn – A young deer.
fealty – Loyalty.
feasible – That may be done, performed, or effected; practicable.
federate – To league together.
feint – Any sham, pretense, or deceptive movement.
felicitate – To wish joy or happiness to, especially in view of a coming event.
felicity – A state of well-founded happiness.
felon – A criminal or depraved person.
felonious – Showing criminal or evil purpose.
felony – One of the highest class of offenses, and punishable with death or imprisonment.
feminine – Characteristic of woman or womankind.
fernery – A place in which ferns are grown.
ferocious – Of a wild, fierce, and savage nature.
ferocity – Savageness.
fervent – Ardent in feeling.
fervid – Intense.
fervor – Ardor or intensity of feeling.
festal – Joyous.
festive – Merry.
fete – A festival or feast.
fetus – The young in the womb or in the egg.
feudal – Pertaining to the relation of lord and vassal.
feudalism – The feudal system.
fez – A brimless felt cap in the shape of a truncated cone, usually red with a black tassel.
fiasco – A complete or humiliating failure.
fickle – Unduly changeable in feeling, judgment, or purpose.
fictitious – Created or formed by the imagination.
fidelity – Loyalty.
fiducial – Indicative of faith or trust.
fief – A landed estate held under feudal tenure.
filibuster – One who attempts to obstruct legislation.
finale – Concluding performance.
finality – The state or quality of being final or complete.
finally – At last.
financial – Monetary.
financier – One skilled in or occupied with financial affairs or operations.
finery – That which is used to decorate the person or dress.
finesse – Subtle contrivance used to gain a point.
finite – Limited.
fiscal – Pertaining to the treasury or public finances of a government.
fishmonger – One who sells fish.
fissure – A crack or crack-like depression.
fitful – Spasmodic.
fixture – One who or that which is expected to remain permanently in its position.
flag-officer – The captain of a flag-ship.
flagrant – Openly scandalous.
flamboyant – Characterized by extravagance and in general by want of good taste.
flatulence – Accumulation of gas in the stomach and bowels.
flection – The act of bending.
fledgling – A young bird.
flexible – Pliable.
flimsy – Thin and weak.
flippant – Having a light, pert, trifling disposition.
floe – A collection of tabular masses of floating polar ice.
flora – The aggregate of plants growing without cultivation in a district.
floral – Pertaining to flowers.
florid – Flushed with red.
florist – A dealer in flowers.
fluctuate – To pass backward and forward irregularly from one state or degree to another.
fluctuation – Frequent irregular change back and forth from one state or degree to another.
flue – A smoke-duct in a chimney.
fluent – Having a ready or easy flow of words or ideas.
fluential – Pertaining to streams.
flux – A state of constant movement, change, or renewal.
foggy – Obscure.
foible – A personal weakness or failing.
foist – To palm off.
foliage – Any growth of leaves.
folio – A sheet of paper folded once, or of a size adapted to folding once.
folklore – The traditions, beliefs, and customs of the common people.
fondle – To handle tenderly and lovingly.
foolery – Folly.
foot-note – A note of explanation or comment at the foot of a page or column.
foppery – Dandyism.
foppish – Characteristic of one who is unduly devoted to dress and the niceties of manners.
forbearance – Patient endurance or toleration of offenses.
forby – Besides.
forcible – Violent.
forecourt – A court opening directly from the street.
forejudge – To judge of before hearing evidence.
forepeak – The extreme forward part of a ship’s hold, under the lowest deck.
foreshore – That part of a shore uncovered at low tide.
forebode – To be an omen or warning sign of, especially of evil.
forecast – To predict.
forecastle – That part of the upper deck of a ship forward of the after fore-shrouds.
foreclose – To bar by judicial proceedings the equitable right of a mortgagor to redeem property.
forefather – An ancestor.
forego – To deny oneself the pleasure or profit of.
foreground – That part of a landscape or picture situated or represented as nearest the spectator.
forehead – The upper part of the face, between the eyes and the hair.
foreign – Belonging to, situated in, or derived from another country.
foreigner – A citizen of a foreign country.
foreknowledge – Prescience.
foreman – The head man.
foreordain – To predetermine.
foreordination – Predestination.
forerun – To go before as introducing or ushering in.
foresail – A square sail.
foresee – To discern beforehand.
foresight – Provision against harm or need.
foretell – To predict.
forethought – Premeditation.
forfeit – To lose possession of through failure to fulfill some obligation.
forfend – To ward off.
forgery – Counterfeiting.
forgo – To deny oneself.
formation – Relative disposition of parts.
formidable – Difficult to accomplish.
formula – Fixed rule or set form.
forswear – To renounce upon oath.
forte – A strong point.
forth – Into notice or view.
forthright – With directness.
fortify – To provide with defensive works.
fortitude – Patient courage.
foursome – Consisting of four.
fracture – A break.
fragile – Easily broken.
frailty – Liability to be broken or destroyed.
fragile – Capable of being broken.
frankincense – A gum or resin which on burning yields aromatic fumes.
frantic – Frenzied.
fraternal – Brotherly.
fraudulence – Deceitfulness.
fraudulent – Counterfeit.
fray – To fret at the edge so as to loosen or break the threads.
freemason – A member of an ancient secret fraternity originally confined to skilled artisans.
freethinker – One who rejects authority or inspiration in religion.
free trade – Commerce unrestricted by tariff or customs.
frequency – The comparative number of any kind of occurrences within a given time or space.
fresco – The art of painting on a surface of plaster, particularly on walls and ceilings.
freshness – The state, quality, or degree of being fresh.
fretful – Disposed to peevishness.
frightful – Apt to induce terror or alarm.
frigid – Lacking warmth.
frigidarium – A room kept at a low temperature for preserving fruits, meat, etc.
frivolity – A trifling act, thought, saying, or practice.
frivolous – Trivial.
frizz – To give a crinkled, fluffy appearance to.
frizzle – To cause to crinkle or curl, as the hair.
frolicsome – Prankish.
frontier – The part of a nation’s territory that abuts upon another country.
frowzy – Slovenly in appearance.
frugal – Economical.
fruition – Fulfillment.
fugacious – Fleeting.
fulcrum – The support on or against which a lever rests, or the point about which it turns.
fulminate – To cause to explode.
fulsome – Offensive from excess of praise or commendation.
fumigate – To subject to the action of smoke or fumes, especially for disinfection.
functionary – An official.
fundamental – Basal.
fungible – That may be measured, counted, or weighed.
fungous – Spongy.
fungus – A plant destitute of chlorophyll, as a mushroom.
furbish – To restore brightness or beauty to.
furlong – A measure, one-eighth of a mile.
furlough – A temporary absence of a soldier or sailor by permission of the commanding officer.
furrier – A dealer in or maker of fur goods.
further – More distant or advanced.
furtherance – Advancement.
furtive – Stealthy or sly, like the actions of a thief.
fuse – To unite or blend as by melting together.
fusible – Capable of being melted by heat.
futile – Of no avail or effect.
futurist – A person of expectant temperament.