| abstruse(adjective, obscure, difficult, uncertain, vague) |
| ambiguous(adjective, obscure, uncertain, vague, unclear) |
| doubtful(uncertain, vague, unclear) |
| enigmatic(obscure, uncertain, vague, unclear, indefinite) |
| enigmatical(obscure, uncertain, vague, unclear, indefinite) |
| equivocal(obscure, uncertain, vague, unclear, indefinite) |
| inconclusive(obscure, uncertain, vague, unclear, indefinite) |
| indefinite(obscure, uncertain, vague, unclear, equivocal) |
| indeterminate(obscure, uncertain, vague, unclear, indefinite) |
| indistinct(uncertain, vague, unclear) |
| inexplicit(adjective, obscure, uncertain, vague, unclear) |
| muddy(obscure, uncertain, vague, unclear, indefinite) |
| obscure(uncertain, vague, unclear, indefinite, equivocal) |
| opaque(obscure, uncertain, vague, unclear, indefinite) |
| puzzling(obscure, uncertain, vague, unclear, indefinite) |
| questionable(uncertain, vague, unclear) |
| tenebrous(obscure, uncertain, vague, unclear, indefinite) |
| unclear(obscure, uncertain, vague, indefinite, equivocal) |
| unintelligible(obscure, uncertain, vague, unclear, indefinite) |
| vague(obscure, uncertain, unclear, indefinite, equivocal) |