| Term | Definition |
| fallacious | based on an incorrect or misleading notion or information |
| fallible | liable to err |
| n fallow | (of land) plowed but not sowed (to improve the quality); uncultivated |
| n fallow | (of land) plowed but not sowed (to improve the quality); uncultivated |
| n falter | hesitate; weaken in purpose or action; walk or move unsteadily through weakness; N. |
| fanaticism | excessive intolerance of opposing views |
| fancied | formed or conceived by the imagination |
| n fancier | breeder or dealer of animals; one who has a special interest, as for raising specific plant or animal |
| s fancy | imagination (of a whimsical or fantastic nature); capricious liking; V: imagine; be fond of; ADJ. decorative; elaborate |
| n fanfare | call by bugles or trumpets; showy display; spectacular public display |
| n farce | broad comedy; mockery; humorous play full of silly things happening; ADJ. farcical |
| n fastidious | difficult to please; squeamish; fussy; finicky |
| s squeamish | easily shocked or sickened by unpleasant things; fastidious; Ex. A nurse should not be squeamish. |
| n fatalism | belief that events are determined by forces or fates beyond one's control; ADJ. fatalistic; CF. fatal: causing death |
| fathom | (mining) a unit of volume (equal to 6 cubic feet) used in measuring bodies of ore |
| n fatuous | smugly and unconsciously foolish; inane; silly; N. fatuity, fatuousness |
| fauna | animals of a period or region; CF. flora |
| n fawning | courting favor by cringing and flattering; V. fawn: exhibit affection as a dog; seek favor or attention by obsequiousness |
| n faze | disconcert; dismay; embarrass |
| feasible | practical; able to be carried out; practicable |
| n febrile | feverish |
| n fecundity | fertility; fruitfulness; ADJ. fecund: very productive of crops or young |