| strange(adjective, mysterious, surprising, inexplicable, unexplained) |
| impenetrable(adjective, obscure, difficult, solid, strange) |
| vague(adjective, clear, obscure, rough, difficult) |
| equivocal(adjective, cover, obscure, rough, difficult) |
| secret(adjective, evil, obscure, strange, humble) |
| inexplicable(adjective, hard, obscure, rough, solid) |
| intricate(adjective, hard, evil, obscure, difficult) |
| mystic(adjective, knowledge, evil, obscure, solid) |
| opaque(adjective, hard, obscure, uncertain, vague) |
| uncertain(adjective, obscure, rough, difficult, doubtful) |
| unknown(strange, mysterious, unclear, indistinct, indistinguishable) |
| bewildering(adjective, hard, obscure, sophisticated, unclear) |
| confounding(adjective, hard, tricky, complicated) |
| indecipherable(adjective, deep, mysterious, unfathomable, profound) |
| oracular(adjective, mysterious) |
| paradoxical(adjective, obscure, uncertainty, uncertain, sophisticated) |
| profound(adjective, hard, obscure, deep, tricky) |
| cabalistic(adjective, knowledge, evil, obscure, solid) |
| complex(adjective, hard, obscure, difficult, tricky) |
| indefinite(obscure, uncertain, doubtful, vague, dubious) |