| ghostly(adjective, extraordinary, superior, unusual, wonderful) |
| indistinct(adjective, doubtful, vague, unclear, ambiguous) |
| obscured(adjective, secret, unknown, hidden, concealed) |
| opaque |
| orphic(adjective, obscure, complex, deep, thoughtful) |
| otherworldly(adjective, extraordinary, unusual, wonderful, marvelous) |
| paradoxical(adjective, hard, delicate, uncertain, complex) |
| preterhuman(adjective, superior, outstanding, amazing, best) |
| shadowy(adjective, obscure, happy, perfect, dark) |
| unnatural(adjective, unusual, strange, odd, secret) |
| unreadable(adjective, unfathomable, enigmatic, unintelligible, sphinx-like) |
| unrevealed(adjective, obscure, dark, new, deep) |
| unsolvable |
| veiled(adjective, obscure, strange, deep, secret) |
| Delphic |
| clairvoyant(adjective, extraordinary, unusual, wonderful, marvelous) |
| classified(obscure, unknown, clandestine, underground, undisclosed) |
| closed |
| confounding(adjective, hard, delicate, complex, tricky) |
| elusive |