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| Extraneous | irrelevant |
| Extrapolate | extend; predict on the basis of known data |
| Extrinsic | irrelevant; on the outside |
| Fallacious | FALSE |
| Falter | hesitate; waver |
| Fanatical | obsessive; fixated |
| Fanaticism | passion; excessive devotion |
| Fastidious | overly particular; finicky |
| Fatuous | silly; foolish |
| Feasible | possible and practicable |
| Fecund | fertile |
| Felicitous | apt |
| Fervor | passion; enthusiasm |
| Fickle | unpredictable; whimsical; easily swayed |
| Finesse | skill |
| Fitful | not continuous; stopping and starting |
| Flagrant | clearly wrong |
| Flamboyant | showy; ornate |
| Flaunt | show off; display in a showy manner |
| Flippant | making jokes about serious matters |