| silliness(nonsense, absurdity, stupidity, foolishness, madness) |
| slip(failure, fault, mistake, lapse, indiscretion) |
| slip-up(failure, fault, mistake, lapse, indiscretion) |
| solecism(fault, mistake, lapse, indiscretion, gaffe) |
| stupidity(nonsense, absurdity, foolishness, madness, idiocy) |
| trip(failure, fault, mistake, lapse, indiscretion) |
| triviality(nonsense, absurdity, stupidity, foolishness, madness) |
| unsoundness(nonsense, absurdity, stupidity, foolishness, madness) |
| vice(nonsense, absurdity, stupidity, foolishness, madness) |
| bloomer(failure, mistake, gaffe, overestimation, cunt) |
| bonehead play(expression, failure, overestimation, cunt, boner) |
| clanger(mistake, gaffe, blooper) |
| colossal blunder |
| cunt(boner, mitten) |
| daftness(noun, nonsense, absurdity, stupidity, foolishness) |
| dottiness(noun, nonsense, absurdity, stupidity, foolishness) |
| false move(expression, failure, overestimation, cunt, boner) |
| foolhardiness(foolishness, madness, idiocy) |
| foul-up(failure, overestimation, cunt, boner, howlers) |
| foulup(failure, overestimation, cunt, boner, howlers) |