| faux |
| flop(break, slip, mess, mistake, breach) |
| flummox(error, muddle, blunder) |
| fool mistake(noun, expression, mistake, rudeness, lapse) |
| foolishness(noun, mistake, rudeness, lapse, error) |
| foulup(error, muddle, blunder) |
| fuckup |
| fumble |
| gaff(mistake, error, blunder) |
| hash(break, slip, mess, mistake, breach) |
| hastiness(noun, mistake, rudeness, lapse, error) |
| illusion(noun, confusion, fault, mistake, lapse) |
| immodesty(slip, mistake, rudeness, impropriety, indecency) |
| improper |
| improperness(slip, rudeness, impropriety, tastelessness, inappropriateness) |
| imprudence(noun, mistake, rudeness, lapse, error) |
| impudence(slip, mistake, rudeness, indiscretion, thoughtlessness) |
| inadvertence(noun, confusion, fault, mistake, lapse) |
| inappropriateness(slip, rudeness, impropriety, tastelessness, unsuitability) |
| incongruity(noun, slip, mistake, rudeness, error) |