| gremlin(noun, difficulty, weakness, crack, failure) |
| snafu(noun, delay, difficulty, fault, error) |
| computer glitch(noun, expression, difficulty, fault, problem) |
| kink(noun, difficulty, weakness, crack, fault) |
| fly in the ointment(noun, expression, difficulty, fault, problem) |
| uphill(noun, difficulty, fault, problem, flaw) |
| misstep(noun, difficulty, slip, failure, fault) |
| catch(noun, control, difficulty, limit, weakness) |
| delay(noun, difficulty, hitch, holdup, snag) |
| failure(noun, difficulty, slip, weakness, fault) |
| absurdity(noun, difficulty, slip, failure, fault) |
| blunder(noun, difficulty, slip, failure, fault) |
| break(noun, verb, weakness, crack, fault) |
| hindrance(noun, delay, difficulty, informal, obstacle) |
| mistake(noun, difficulty, slip, weakness, crack) |
| change in rotation rate of pulsar(noun, expression, change, alteration, modification) |
| drawback(noun, difficulty, crack, fault, blemish) |
| failing(noun, adjective, weak, weakness, poor) |
| imperfection(noun, weakness, crack, informal, fault) |
| restriction(noun, control, difficulty, limit, informal) |