| opaque(adjective, hard, understandable) |
| deep |
| occult(adjective, dark, strange, uncertain, mysterious) |
| unaccountable(adjective, obscure, solid, strange, doubtful) |
| unimaginable(adjective, understandable) |
| ambiguous(adjective, obscure, dark, uncertain, doubtful) |
| incoherent(adjective, confused, rambling, unintelligible, disjointed) |
| profound |
| undecipherable(adjective, illegible, unintelligibility) |
| esoteric |
| illimitable(adjective, complete, absolute, unrestrained, indefinite) |
| immeasurable(adjective, complete, deep, absolute, unrestrained) |
| inarticulate(adjective, confused, unable, rambling, incoherent) |
| limitless(adjective, complete, absolute, unrestrained, indefinite) |
| secret(adjective, obscure, dark, strange, uncertain) |
| unexplainable(adjective, obscure, strange, odd, mysterious) |
| unknowable(adjective, obscure, solid, dark, strange) |
| unlimited(adjective, complete, extensive, immense, infinite) |
| bewildering |
| boundless(adjective, complete, deep, absolute, unrestrained) |