| Term | Definition |
| ford | shallow place in a river (to cross) |
| forbearance | patience; willingness to wait |
| forbear | to refrain from; to be patient; ancestor |
| forage | food for horses and cattle |
| foppish | someone who dresses like a fop (pays too much attention to his clothes) |
| foolproof | incapable of failure or error |
| foment | to pronounce or incite |
| foil | to prevent from carrying out; contrast |
| foible | defect of character (a person is wrongly proud) |
| fluster | to make nervous or confused |
| fluke | stroke of luck |
| flout | to reject or mock; to go against (as in going against tradition) |
| flounder | to struggle to move; to proceed clumsily |
| florid | very much ornamented; flushed with rosy color |
| flop | to fail; to move; to fall clumsily |
| flinch | to draw; to move back; to wince |
| fleet | number of ships; quick-moving |
| fledged | able to fly; trained; experienced |
| flay | to skin; to excoriate |
| flax | pale; a plant |
| flaunting | to show off complacently |
| flamboyant | brightly colored; florid |
| flak | criticism; antiaircraft guns |
| fixate | to stare at; to be obsessed with |
| fission | splitting or division |
| finical/finicky | difficult to please |
| finesse | delicate way of dealing with a situation |
| figurehead | carved image on the prow of a ship |
| fidget | to move restlessly; to make nervous |
| fidelity | loyalty; accuracy |
| feud | bitter quarrel over a long period of time |
| fetter | to shackle; to put in chains |
| fetid | stinking |
| fervor | warmth of feelings; earnestness |
| fervid | showing earnest feeling |
| ferret | to discover by searching; to search |
| ferocity | savage cruelty |
| ferment | substance; to become excited |
| felon | person guilty of murder |
| felicitous | apt; suitably expressed; well chosen |
| feint | to pretend |
| fecund | fertile |
| feckless | lacking purpose or vitality; ineffective |
| fawn | to attempt to please someone |
| fatuous | without sense; foolish self-satisfaction |
| fanciful | imaginary |
| falter | to waver; to move in an uncertain manner |
| fallacious | based on error |
| facile | easily done |
| facetious | humorous; funny; jocular |