| secret(adjective, evil, obscure, dark, strange) |
| dark(adjective, feature, obscure, mysterious, hidden) |
| heavy(adjective, easy, severe, obscure, slang) |
| abstract(adjective, hard, obscure, difficult, complex) |
| mystic(adjective, evil, obscure, dark, deep) |
| subtle(adjective, hard, sharp, obscure, difficult) |
| mystifying(adjective, hard, evil, obscure, strange) |
| opaque(adjective, hard, obscure, difficult, uncertain) |
| ambiguous(adjective, obscure, strange, uncertain, doubtful) |
| concealed(adjective, evil, obscure, difficult, dark) |
| knotty(adjective, hard, fancy, evil, obscure) |
| vague(adjective, obscure, difficult, uncertain, doubtful) |
| baffling(adjective, hard, obscure, difficult, dark) |
| impenetrable(adjective, obscure, difficult, strange, deep) |
| inscrutable(adjective, obscure, strange, sophisticated, supernatural) |
| mystical(adjective, hard, evil, obscure, dark) |
| cabalistic(adjective, evil, obscure, strange, deep) |
| fine(adjective, exact, discriminating) |
| ticklish(hard, tricky, complicated) |
| transcendental(strange, intellectual, unknown, abstract, theoretical) |