| unsafe(adjective, dishonest, deceitful, unreliable, insecure) |
| unsound(adjective, uncertain, unsettled, dubious, unpredictable) |
| unstable(adjective, open, obscure, uncertain, unsettled) |
| unthinkable(adjective, extraordinary, amazing, unbelievable, implausible) |
| weak(adjective, great, extraordinary, amazing, doubtful) |
| apocryphal |
| changeable(adjective, uncertain, doubtful, vague, hesitant) |
| clouded(adjective, clear, certain, uncertain, doubtful) |
| contentious(adjective, doubtful, dubious, provocative, debatable) |
| cryptic(adjective, uncertain, doubtful, vague, dubious) |
| dicey(adjective, shaky, unlikely, unpromising) |
| difficult(adjective, tricky, sticky, challenging) |
| discreditable(adjective, disrepute) |
| dishonourable |
| dodgy(adjective, corrupt, dishonest, dubious, suspect) |
| enigmatic(adjective, uncertain, doubtful, vague, dubious) |
| evasive |
| fantastic(adjective, unlikely, unbelievable, improbable) |
| funny(unusual, strange, dubious, suspect, shady) |
| hard to believe(expression, adjective, idiom, unbelief doubt) |