| weak point(noun, expression, weakness, crack, fault) |
| weakness(noun, crack, fault, lack, failing) |
| germ |
| albatross(noun, difficulty, obstacle, obstruction, impediment) |
| bad job(noun, expression, difficulty, slip, failure) |
| boner(noun, difficulty, slip, failure, fault) |
| boo-boo(noun, difficulty, slip, failure, fault) |
| breakdown |
| delinquency(noun, difficulty, slip, failure, fault) |
| delusion(noun, difficulty, slip, failure, fault) |
| deviation(noun, difficulty, slip, failure, fault) |
| falsity(noun, difficulty, slip, failure, fault) |
| faulty(adjective, poor, insufficient, scarce) |
| faux pas(noun, expression, difficulty, slip, failure) |
| howler(noun, difficulty, slip, failure, fault) |
| inadequate(adjective, poor, informal, incompetent, insufficient) |
| lapse(noun, difficulty, slip, failure, fault) |
| misbelief(noun, difficulty, slip, failure, fault) |
| miscue(noun, difficulty, slip, failure, fault) |
| misjudgment(noun, difficulty, slip, failure, fault) |