| unaccountable(adjective, obscure, solid, strange, doubtful) |
| unmeasured(adjective, infinity, bottomless) |
| heavy(adjective, hard, difficult) |
| countless(constant, abundant, unrestrained, immense, infinite) |
| indecipherable(adjective, hard, obscure, difficult, dark) |
| perpetual(constant, abundant, unrestrained, endless, immense) |
| unbounded(adjective, constant, abundant, unrestrained, immense) |
| uncomprehensible(adjective, hard, knowledge, obscure, difficult) |
| unfathomed(adjective, depth) |
| unplumbed(adjective, size, bottomless) |
| vast(adjective, complete, deep, immense, infinite) |
| ambiguous(adjective, obscure, dark, uncertain, doubtful) |
| eternal(adjective, deep, constant, abundant, unrestrained) |
| incognizable(adjective, hard, difficult, solid, deep) |
| inconceivable(adjective, size) |
| indefinite(vast, endless, immense, infinite, boundless) |
| undecipherable(adjective, unintelligibility) |
| ungraspable(adjective, hard, difficult, solid, deep) |
| untold(constant, abundant, unrestrained, endless, immense) |
| hidden(adjective, hard, obscure, difficult, solid) |