| fabricate | manufacture |
| Fair | just, impartial, unbiased, objective, unprejudiced, honest |
| Fall | drop, descend, plunge, topple, tumble |
| fake, fraudulent, counterfeit, spurious, untrue, unfounded, erroneous, deceptive, groundless, fallacious |
| Famous | well-known, renowned, celebrated, famed, eminent, illustrious, distinguished, noted, notorious |
| fanatic | enthusiast |
| fantastic | great, brilliant |
| Fast | quick, rapid, speedy, fleet, hasty, snappy, mercurial, swiftly, rapidly, quickly, snappily, speedily, lickety-split, posthaste, hastily, expeditiously, like a flash |
| Fat | stout, corpulent, fleshy, beefy, paunchy, plump, full, rotund, tubby, pudgy, chubby, chunky, burly, bulky, elephantine |
| Fear | fright, dread, terror, alarm, dismay, anxiety, scare, awe, horror, panic, apprehension |
| fertile | fruitful |
| finish | complete, conclude, achieve, deplete, consume |
| float | drift |
| Fly | soar, hover, flit, wing, flee, waft, glide, coast, skim, sail, cruise |
| fool | idiot |
| foolish | silly |
| forehead | brow |
| predict |
| formerly | previously |
| fortunate | lucky |
| foxy | cunning |
| foyer | lobby |
| fragrance | perfume |
| French dressing | vinaigrette |
| fun | pleasant, pleasurable, amusing, entertaining, jolly |
| function | operate |
| Funny | humorous, amusing, droll, comic, comical, laughable, silly |
