| incognizable(adjective, understandable, unintelligibility) |
| inexhaustible(immense, infinite, boundless, unlimited, infinity) |
| innumerable(immense, infinite, boundless, unlimited, infinity) |
| measureless(complete, absolute, unrestrained, indefinite, immense) |
| mystic(adjective, obscure, solid, strange, mysterious) |
| unbounded(complete, absolute, unrestrained, indefinite, immense) |
| vague(adjective, obscure, difficult, heavy, uncertain) |
| complex(adjective, obscure, heavy, deep, puzzling) |
| complicated(adjective, obscure, heavy, deep, doubtful) |
| elusive(adjective, mysterious, evasive) |
| equivocal(adjective, obscure, difficult, dark, strange) |
| exhaustless |
| extraordinary(adjective, awful, strange, superb, wonderful) |
| fathomless(adjective, understandable) |
| garbled(adjective, incoherent, inarticulate) |
| hard |
| hidden(adjective, obscure, solid, heavy, strange) |
| ill-defined |
| incredible |
| indefinite(complete, absolute, unrestrained, immense, infinite) |