| Term | Definition |
| fallacious | false; misleading |
| fallible | liable to err |
| fallow | plowed but not sowed;uncultivated |
| falter | hesitate |
| fanaticism | excessive zeal; extreme devotion to a belief or cause |
| fancied | imagined; unreal |
| fancier | breeder or dealer of animals |
| fanciful | whimsical; visionary |
| fanfare | call by bugles or trumpets;showy display |
| farce | broad comedy; mockery |
| fastidious | difficult to please; squeamish |
| fatalism | belief that events are determined by forces beyond one's control |
| fathom | comprehend; investigate |
| fatuous | foolish; inane |
| fauna | animals of a period or region |
| fawning | courting favor by cringing and flattering |
| faze | disconcert; dismay |
| feasible | practical |
| febrile | feverish i.e having symptoms of fever or 2) excited, restless |
| fecundity | fertile; fruitfulness |
| feign | pretend |
| feint | trick; shift; sham blow |
| felicitous | apt; suitable expressed; well chosen |
| felicity | happiness; appropriateness (of a remark, choice, etc.) |
| fell (adj.) | cruel; deadly |
| fell (v) | cut or knock down; bring down (with a missile) |
| felon | person convicted of a grave crime |
| feral | not domestic; wild |
| ferment | agitation; commotion |
| ferret | drive or hunt out hiding |
| fervent | ardent; hot |
| fervid | ardent |
| fervor | glowing ardor; intensity of feeling |
| fester | rankle; produce irritation resentment |
| festive | joyous; celebratory |
| fete | honor at a festival; entertain (<-v) ; (n->) outdoor function to raise money for charity |
| fetid | malodorous |
| fetter | shackle |
| feud | lasting mutual hostility especially between two families or groups |
| fiasco | total failure |
| fiat | command |
| fickle | changeable; faithless |
| fictitious | imaginary |
| fidelity | loyalty |
| figment | invention; imaginary thing |
| figurative | not literal, but metaphorical; using a figure of speech |
| figurine | small ornamental statuette |
| filch | steal |
| filial | pertaining to a son or daughter |
| filibuster | block legislation by making long speeches |
| filigree | delicate, lacelike metalwork |
| filing | particle removed by a file |
| finale | conclusion |
| finesse | delicate skill |
| finicky | too particular; fussy |
| finite | limited |
| firebrand | hothead; troublemaker |
| fissure | crevice |
| fitful | spasmodic; intermittent |
| flaccid | hanging in loose folds or wrinkles; flabby |
| flag | droop; grow feeble |
| flagrant | conspicuously wicked; blatant; outrageous |
| flail | thresh grain by hand; strike or slap; toss about |
| flair | talent |
| flamboyant | ornate |
| flaunt | display ostentatiously |
| flay | strip off skin; *plunder*; to criticize mercilessly |
| fleck | spot |
| fledgling | inexperienced |
| fleece (n) | wool coat of a sheep |
| fleece (v) | rob; plunder |
| flick | light stroke as with a whip |
| flinch | hesitate; shrink |