| incomprehensible(adjective, obscure, solid, dark, strange) |
| unexplainable(adjective, obscure, strange, explain, explanation) |
| unaccountable(adjective, obscure, solid, extraordinary, superior) |
| mysterious(adjective, hard, obscure, dark, strange) |
| inscrutable(adjective, solid, dark, uncertain, blank) |
| unfathomable(adjective, hard, obscure, difficult, solid) |
| odd(adjective, unusual, strange, explanation, supernatural) |
| peculiar(adjective, unusual, strange, explanation, supernatural) |
| insoluble(adjective, strange, explanation, unable, unfathomable) |
| strange(adjective, extraordinary, unusual, marvelous, amazing) |
| enigmatic(adjective, hard, obscure, rough, solid) |
| extraordinary(adjective, superior, unusual, strange, marvelous) |
| unintelligible(adjective, hard, rough, solid, dark) |
| mystifying(adjective, hard, obscure, delicate, strange) |
| abnormal(adjective, unusual, supernatural, unnatural, uncanny) |
| baffling(adjective, hard, obscure, delicate, solid) |
| mystic(adjective, obscure, solid, strange, mysterious) |
| obscure(adjective, hard, solid, dark, uncertain) |
| puzzling(adjective, hard, dark, strange, uncertain) |
| bizarre(adjective, unusual, strange, supernatural, curious) |