| erring(adjective, able, prone) |
| heedless(adjective, able, prone) |
| inadequate |
| precarious(adjective, uncertainty, unreliable, insecure, treacherous) |
| slippery(adjective, uncertainty, unreliable, insecure, treacherous) |
| adulterated |
| controvertible |
| deceptive(adjective, weak, unpredictable, fickle, variable) |
| delicate |
| dubious(adjective, unpredictable, unreliable, fickle, variable) |
| erroneous(adjective, false, inadequate, unpredictable, insufficient) |
| fallacious(adjective, reasoning) |
| false(adjective, inadequate, reasoning, unpredictable, insufficient) |
| fly-by-night(adjective, unpredictable, unreliable, fickle, variable) |
| ignorant(adjective, able, prone) |
| irresponsible(adjective, unpredictable, unreliable, fickle, variable) |
| makeshift(adjective, unpredictable, fickle, variable, undependable) |
| not perfect(expression, idiom) |
| treacherous(adjective, unpredictable, unreliable, fickle, variable) |
| unpredictable(adjective, fickle, variable, undependable, fly-by-night) |