| mysterious(adjective, hard, knowledge, evil, obscure) |
| puzzling(adjective, hard, knowledge, evil, obscure) |
| baffling(adjective, obscure, delicate, strange, complex) |
| cryptic(adjective, knowledge, evil, obscure, strange) |
| perplexing(adjective, complicated, unfathomable, impenetrable, opaque) |
| enigmatic(adjective, hard, knowledge, evil, obscure) |
| confusing(adjective, hard, delicate, complex, complicated) |
| incomprehensible(adjective, strange, unfathomable, understandable, impenetrable) |
| inscrutable |
| bewildering(adjective, hard, tricky, complicated, puzzling) |
| deep(adjective, hard, evil, delicate, loose) |
| confounding(adjective, hard, delicate, complex, tricky) |
| obscure(adjective, hard, strange, mysterious, complicated) |
| inexplicable(adjective, hard, obscure, delicate, strange) |
| abstruse(adjective, hard, evil, obscure, strange) |
| occult(adjective, knowledge, evil, obscure, dark) |
| unclear(adjective, hard, delicate, unfathomable, opaque) |
| arcane(adjective, knowledge, evil, obscure, dark) |
| cryptical |
| recondite(adjective, evil, obscure, dark, strange) |