| incredulous(adjective, doubtful, skeptical, unbelieving) |
| equivocal(adjective, clear, open, rough, delicate) |
| obscure(adjective, rough, uncertain, unreasonable, doubtful) |
| undependable(adjective, uncertain, nervous, dishonest, doubtful) |
| iffy(adjective, clear, open, delicate, informal) |
| improbable(adjective, uncertain, unreasonable, doubtful, likely) |
| shaky(adjective, delicate, uncertain, nervous, unstable) |
| indecisive(adjective, clear, open, delicate, certain) |
| distrustful(adjective, uncertain, nervous, doubtful, unsettled) |
| dubitable(adjective, clear, certain, uncertain, anxious) |
| moot(noun, adjective, open, uncertain, doubtful) |
| skeptical(adjective, certain, doubt, uncertain, nervous) |
| unclear(adjective, clear, open, rough, certain) |
| hesitant(adjective, open, uncertain, nervous, doubtful) |
| implausible(adjective, great, slight, extraordinary, amazing) |
| in question(expression, adjective, idiom, clear, obscure) |
| arguable(noun, adjective, uncertain, doubtful, unsettled) |
| disreputable(adjective, uncertain, doubtful, unsettled, unpredictable) |
| fly-by-night(adjective, uncertain, nervous, dishonest, doubtful) |
| problematical(adjective, clear, certain, uncertain, doubtful) |