| Fabulous | Fabled, Legendary, Fanciful, Imaginary |
| Fallacy | Misconception, Mistake, Error |
| Famished | Starving, Ravenous, Craving, Hungry |
| Fanatical | Extreme, Maniacal, Mad, Rabid, Frenzied |
| Farcical | Ludicrous, Preposterous, Funny, Nonsensical, Ridiculous, Silly, Absurd |
| Fastidious | Squeamish, Delicate, Fussy, Meticulous, Finicky |
| Feasible | Practicable, Workable, Viable, Possible, Achievable, Attainable, |
| Feeble | Weak, Infirm, Frail, Debilitated, Decrepit, Exhausted, |
| Fervent | Fiery, Burning, Intense, Passionate, Ardent |
| Feud | Argument, Dispute |
| Fickle | Capricious, Frivolous, Unpredictable, Moody |
| Finesse | Artfulness, Subtlety, Cunning, Craftiness, Cleverness, Tactful |
| Flagrant | Blatant, Brazen, Bold, Audacious, Glaring, Outrageous |
| Flatter | Compliment, Praise |
| Flaunt | Display, Parade, Exhibit, Sport |
| Flaw | Fault, Defect, Imperfection, Error, Mistake, Blemish |
| Flourish | Prosper, Thrive, Grow, Develop |
| Forlorn | Miserable, Desolate, Woebegone, Pathetic |
| Formidable | Alarming, Appalling, Dreadful, Frightful, Awesome, Menacing |
| Fortitude | Strength, Mettle, Courage, Resoluteness, Endurance, Tenacity |
| Fragrant | Aromatic, Odorous, Perfumed, Balmy, Odoriferous, Sweet-Smelling |
| Frantic | Frenzied, Excited, Nervous, Excitable, Distraught |
| Frivolous | Inconsequential, Trivial |
| Frugal | Thrifty, Sparing, Economical, Prudent |
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