| 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 |
| flounder | struggle and thrash about; proceed clumsily or falter |
| flourish | grow well; prosper; make sweeping gestures |
| fodder | coarse food for cattle, horses, etc |
| foible | weakness; slight fault |
| foil (n) | *contrast* |
| foil (v) | defeat; frustrate |
| foist | insert improperly; palm off |
| foolhardy | bold or daring in a foolish way; rash; reckless |
| foppish | vain (<-conceited, proud of ) about dress and appearance |
| foray | raid |
| forbearance | patience |
| ford | place where a river can be crossed on foot |
| forebears | ancestors |
| foresight | ability to foresee future happenings; prudence |
| forsake | desert; abandon; renounce |
| forswear | renounce; abandon |
| forte | strong point or special talent |
| fortitude | bravery; courage |
| fortuitous | accidental; by chance |
| foster | rear; encourage |
| founder (n) | person who establishes (an organization, business) |
| founder (v) | *fail completely; sink* |
| fracas | brawl, melee |
| fractious | unruly |
| frail | weak |
| franchise | right granted by authority; right to vote; license to sell a product in a particular territory |
| frantic | wild |
| fraught | filled |
| fray | a noisy quarrel or fight; brawl |
| frenetic | frenzied; frantic |
| fresco | painting on plaster (usually fresh) |
| fret | to be annoyed or vexed |
| friction | *clash in opinion*; rubbing against |
| frieze | ornamental band on a wall |
| fritter | waste |
| frivolous | lacking in seriousness; selfindulgently carefree; relatively unimportant |
| frond | fern leaf; palm or banana leaf |
| fructify | bear fruit; fulfillment; realization |
| fruition | bearing of fruit; fulfillment; realization |
| frustrate | thwart; defeat |
| fulcrum | support on which a lever rests |
| fulminate | thunder; explode |
| fulsome | disgustingly excessive |
| functionary | official |
| funereal | sad; solemn |
| furor | frenzy; great excitement |