| off(adjective, wrong, rough, poor, false) |
| on the blink(expression, adjective, idiom, continuously) |
| on the fritz(expression, adjective, idiom, disrepair) |
| second-rate(adjective, weak, poor, miserable, inferior) |
| sick(adjective, incorrect, deficient, broken, working) |
| slipshod(adjective, rough, poor, awful, careless) |
| spurious(adjective, bad, wrong, fake, false) |
| substandard(adjective, weak, rough, poor, awful) |
| unfit(adjective, incompetent, incorrect, broken, working) |
| unsuitable(adjective, weak, wrong, false, feeble) |
| aberrant(adjective, wrong) |
| amateurish |
| at fault(expression, adjective, bad, wrong, false) |
| inappropriate(adjective, wrong, false, useless, incorrect) |
| incongruous(false, ill, insane, unhealthy, irrational) |
| ineffective(adjective, weak, poor, inadequate, feeble) |
| inefficient(adjective, weak, feeble, well, incompetent) |
| leaky(adjective, incorrect, imperfection, working, imperfect) |
| malfunctioning(adjective, incorrect, working) |
| mediocre(adjective, weak, poor, miserable, inferior) |