| dumb(adjective, impractical, half-baked, doomed) |
| flimsy(adjective, reasoning) |
| gloomy(adjective, dull, dark, uncertain, dim) |
| in doubt(expression, adjective, open, obscure, uncertain) |
| inconclusive(adjective, obscure, uncertain, anxious, unknown) |
| insecure(adjective, uncertain, nervous, doubtful, worried) |
| meagre |
| meaningless(adjective, dull, use, value, stupid) |
| misleading(adjective, false, uncertain, doubtful, dubious) |
| neutral(adjective, dull, flat, careful, pale) |
| nondescript(adjective, character, ordinary, commonplace, unexceptional) |
| nonspecific(soft, tolerant, slack, lenient, remiss) |
| obfuscated(adjective, obscure) |
| occult(adjective, unintelligibility) |
| open(adjective, certain, nervous, insecure, unsure) |
| oracular(adjective, uncertainty, prophetic) |
| random(noun, adjective, dull, loose, wordy) |
| recondite(adjective, unintelligibility) |
| shrouded |
| slight(adjective, weak, pale, unclear, subtle) |