forefather n. An ancestor.
forego v. To deny oneself the pleasure or profit of.
foreground n. That part of a landscape or picture situated or represented as nearest the spectator.
forehead n. The upper part of the face, between the eyes and the hair.
foreign adj. Belonging to, situated in, or derived from another country.
foreigner n. A citizen of a foreign country.
foreknowledge n. Prescience.
foreman n. The head man.
foreordain v. To predetermine.
foreordination n. Predestination.
forerun v. To go before as introducing or ushering in.
foresail n. A square sail.
foresee v. To discern beforehand.
foresight n. Provision against harm or need.
foretell v. To predict.
forethought n. Premeditation.
forfeit v. To lose possession of through failure to fulfill some obligation.
forfend v. To ward off.
forgery n. Counterfeiting.
forgo v. To deny oneself.
formation n. Relative disposition of parts.
formidable adj. Difficult to accomplish.
formula n. Fixed rule or set form.
forswear v. To renounce upon oath.
forte n. A strong point.
forth adv. Into notice or view.
forthright adv. With directness.
fortify v. To provide with defensive works.
fortitude n. Patient courage.
foursome adj. Consisting of four.
fracture n. A break.
fragile adj. Easily broken.
frailty n. Liability to be broken or destroyed.
fragile adj. Capable of being broken.
frankincense n. A gum or resin which on burning yields aromatic fumes.
frantic adj. Frenzied.
fraternal adj. Brotherly.
fraudulence n. Deceitfulness.
fraudulent adj. Counterfeit.
fray v. To fret at the edge so as to loosen or break the threads.
freemason n. A member of an ancient secret fraternity originally confined to skilled artisans.
freethinker n. One who rejects authority or inspiration in religion.
free trade n. Commerce unrestricted by tariff or customs.
frequency n. The comparative number of any kind of occurrences within a given time or space.
fresco n. The art of painting on a surface of plaster, particularly on walls and ceilings.
freshness n. The state, quality, or degree of being fresh.
fretful adj. Disposed to peevishness.
frightful adj. Apt to induce terror or alarm.
frigid adj. Lacking warmth.
frigidarium n. A room kept at a low temperature for preserving fruits, meat, etc.
frivolity n. A trifling act, thought, saying, or practice.
frivolous adj. Trivial.
frizz v. To give a crinkled, fluffy appearance to.
frizzle v. To cause to crinkle or curl, as the hair.
frolicsome adj. Prankish.
frontier n. The part of a nation's territory that abuts upon another country.
frowzy adj. Slovenly in appearance.
frugal adj. Economical.
fruition n. Fulfillment.
fugacious adj. Fleeting.
fulcrum n. The support on or against which a lever rests, or the point about which it turns.
fulminate v. To cause to explode.
fulsome adj. Offensive from excess of praise or commendation.
fumigate v. To subject to the action of smoke or fumes, especially for disinfection.
functionary n. An official.
fundamental adj. Basal.
fungible adj. That may be measured, counted, or weighed.
fungous adj. Spongy.
fungus n. A plant destitute of chlorophyll, as a mushroom.
furbish v. To restore brightness or beauty to.
furlong n. A measure, one-eighth of a mile.
furlough n. A temporary absence of a soldier or sailor by permission of the commanding officer.
furrier n. A dealer in or maker of fur goods.
further adj. More distant or advanced.
furtherance n. Advancement.
furtive adj. Stealthy or sly, like the actions of a thief.
fuse v. To unite or blend as by melting together.
fusible adj. Capable of being melted by heat.
futile adj. Of no avail or effect.
futurist n. A person of expectant temperament.