| ding-dong(noun, slang, ability) |
| drop a brick(verb, expression, idiom) |
| drop the ball(expression, idiom, fall, stumble, stray) |
| erratum(noun, slip, failure, fault, mistake) |
| fool(noun, ability) |
| fool mistake(noun, expression, mistake, rudeness, lapse) |
| gander(noun, ability, informal) |
| gaucherie(noun, break, slip, mess, mistake) |
| glitch(noun, difficulty, slip, failure, fault) |
| goldbrick(verb, phrasal verb, slang, industrious) |
| goof up(expression, blow, harm, spoil, confuse) |
| gum up(expression, blow, harm, spoil, confuse) |
| idle(verb, pass, industrious) |
| imbecile(noun, ability) |
| impropriety(noun, break, taste, slip, fault) |
| inaccuracy(noun, slip, failure, fault, mistake) |
| loaf(verb, pass, industrious) |
| lounge(verb, pass, industrious) |
| lump |
| lunkhead |