| Term | Definition |
| flippant | lacking proper seriousness |
| flit | fly; dart lightly; pass swiftly by |
| floe | mass of floating ice |
| flora | plants of a region or era |
| florid | ruddy; reddish; flowery |
| flounder | struggle and thrash about; proceed clumsily or falter |
| flourish | grow well; prosper; decorate with oraments |
| flout | reject; mock |
| fluctuate | waver; shift |
| fluency | smoothness of speech |
| fluke | unlikely occurence; stroke of fortune |
| flusture | confuse |
| flux | flowing; series of changes |
| fodder | coarse food for cattle, horses, etc |
| foible | weakness; slight fault |
| foil | contrast |
| foil | defeat; frustrate |
| foliage | masses of leaves |
| foment | stir up; instigate |
| foolhardy | rash |
| fop | dandy; man excessively concerned with his clothes |
| forbearance | patience |
| ford | place where a river can be crossed on foot |
| forebears | ancestors |
| foreboding | premonition of evil |
| forensic | suitable to debate or courts of law |
| foreshadow | give an indication beforehand; portend; prefigure |
| foresight | ability to foresee future happenings; prudence |
| forestall | prevent by taking action in advance |
| forgo | give up; do without |
| forlorn | sad andlonely; wretched |
| formality | ceremonious quality; something done just for form's sake |
| formidable | inspiring fear or apprehension; difficult; awe-inspiring |
| forsake | desert; abandon; renounce |
| forswear | renounce; abandon |
| forte | strong point or special talent |
| forthright | outspokent; straightforward; frank |
| fortitude | bravery; courage |
| fortuitous | accidental; by chance |
| forum | place of assembly to discuss public concerns; meeting for discussion |
| foster | rear; encourage |
| founder | fail completely; sink |
| founder | person who establishes (an organization, business) |
| fracas | brawl, melee |
| fractious | unruly; disobedient; irritable |
| frail | weak |
| franchise | right granted by authority; right to vote; business liscensed to sell a product in a particular territory |
| frantic | wild |
| fraternize | associate in a friendly way |
| fraudulent | cheating; deceitful |
| fraught | filled |
| fray | brawl |
| frenetic | frenzied; frantic |
| frenzied | madly excited |
| fresco | painting on plaster (usually fresh) |
| fret | to be anoyed or vexed |
| friction | clashe in opinion; rubbign against |
| frigid | intensely cold |
| frivolous | lacking in seriousness; self-indulgently carefree; relatively unimportant |
| froliscome | prankish |
| frond | fern leaf; palm or banana leaf |
| frugality | thrift; economy |
| fruition | bearing of fruit; fulfillment; realization |
| frustrate | thwart; defeat |
| fugitive | fleeting or transitory; roving |
| fulcrum | support of shich a lever rests |
| fulsome | disguistingly excessive |
| fundamental | basic; primary; essential |
| furlough | leave of absence; vacation granted a soldier or civil servant |
| furor | frenzy; great excitement |
| furtive | stealthy; sneaky |
| fusion | union; blending; synthesis |
| futile | useless; hopeless; ineffectual |
| gadfly | animal-biting fly; an irritating person |
| gaffe | social blunder |