| frenetic | Fast and energetic in a rather wild and uncontrolled way | |
| fracas | A noisy disturbance or quarrel | |
| fortuitous | Happening by accident or chance rather than design | |
| fortitude | Courage in pain or adversity | |
| formidable | Inspiring fear or respect through being impressively large, powerful, intense, or capable | |
| forestall | To prevent or obstruct an anticipated event or action by taking action ahead of time | |
| foreground | The part of a view that is nearest to the observer, especially in a picture or photograph | |
| forbearance | Patient self-control; restraint and tolerance under provocation | |
| foment | To instigate or stir up an undesirable or violent sentiment, action, or situation | |
| foible | A minor weakness or eccentricity in someone's character | |