| fallacy(slip, failure, fault, mistake, lapse) |
| falsehood(slip, failure, fault, mistake, lapse) |
| falsity(slip, failure, fault, mistake, lapse) |
| fast one(expression, evil, case, breach, corruption) |
| flagitiousness(wickedness, sin, depravity) |
| flop(break, slip, mess, mistake, breach) |
| flub(noun, break, slip, failure, mess) |
| foible(noun, wrong, slip, weakness, burden) |
| foray |
| forced entrance(expression, attack, offensive, assault, interruption) |
| forfeiture(noun, noncompliance) |
| foul |
| foul-up(break, slip, mess, mistake, breach) |
| frailty(noun, wrong, slip, weakness, burden) |
| friskiness(trouble, wrong, damage, evil, harm) |
| frolicsomeness(trouble, wrong, damage, evil, harm) |
| frowardness |
| funny business(expression, trouble, wrong, evil, ill) |
| gaffe(noun, break, slip, mess, mistake) |
| gag(trouble, wrong, damage, evil, harm) |