| conjectural |
| contingent(uncertain, doubtful, shaky, dubious, unclear) |
| deniable |
| dicey(uncertain, shaky, unclear, unlikely, questionable) |
| diffident(adjective, uncertain, doubtful, unsure) |
| disputed |
| disreputable(uncertain, shaky, unclear, unlikely, questionable) |
| enigmatic(obscure, uncertain, doubtful, dubious, tricky) |
| far-fetched(uncertain, doubtful, shaky, unclear, unsure) |
| farfetched(adjective, improbable) |
| fat chance(expression, uncertain, shaky, unclear, unlikely) |
| fly-by-night(uncertain, doubtful, unsure) |
| hazardous(uncertain, shaky, unclear, unlikely, questionable) |
| hazy(uncertain, shaky, unclear, unlikely, questionable) |
| hesitant(uncertain, doubtful, unsure) |
| impugnable(uncertain, shaky, unclear, unlikely, questionable) |
| inconceivable |
| indefinite(obscure, uncertain, doubtful, dubious, unclear) |
| indistinct(uncertain, shaky, unclear, unlikely, questionable) |
| insecure(uncertain, shaky, unclear, unlikely, questionable) |