| problematic(adjective, clear, open, difficult, certain) |
| debatable(adjective, certain, uncertain, doubtful, dubious) |
| doubtful(adjective, clear, certain, uncertain, dubious) |
| questionable(adjective, clear, certain, uncertain, dubious) |
| dubious(adjective, clear, certain, uncertain, doubtful) |
| baffling(adjective, hard, delicate, complex, tricky) |
| moot(adjective, certain, uncertain, doubtful, dubious) |
| arguable(adjective, certain, uncertain, doubtful, dubious) |
| difficult(adjective, hard, complex, awkward, demanding) |
| disputable(adjective, certain, uncertain, doubtful, dubious) |
| uncertain(adjective, clear, certain, doubtful, dubious) |
| knotty(adjective, hard, difficult, delicate, loose) |
| dubitable(adjective, clear, obscure, certain, uncertain) |
| enigmatic(adjective, hard, obscure, uncertainty, uncertain) |
| iffy(adjective, clear, informal, certain, uncertain) |
| chancy(adjective, clear, certain, uncertain, dubious) |
| in question(adjective, idiom, clear, certain, ambiguous) |
| intricate(adjective, hard, difficult, delicate, loose) |
| theoretical(adjective, hypothetical) |
| controversial |