| puzzling(adjective, hard, fancy, obscure, rough) |
| baffling(verb, adjective, hard, obscure, difficult) |
| confusing(verb, adjective, hard, difficult, false) |
| enigmatic(adjective, hard, obscure, rough, difficult) |
| intricate(adjective, hard, fancy, obscure, difficult) |
| mystifying(adjective, complicated, unfathomable, impenetrable, opaque) |
| obscure(adjective, hard, rough, difficult, dark) |
| involved(adjective, hard, fancy, obscure, difficult) |
| abstruse(adjective, hard, fancy, obscure, difficult) |
| difficult(adjective, hard, fancy, obscure, delicate) |
| mysterious(adjective, hard, obscure, strange, complex) |
| confounding(noun, verb, adjective, hard, wrong) |
| incomprehensible(adjective, obscure, difficult, dark, strange) |
| complex(adjective, hard, fancy, difficult, delicate) |
| bewildering(adjective, hard, obscure, false, sophisticated) |
| knotty(adjective, hard, fancy, obscure, difficult) |
| complicated(adjective, hard, obscure, difficult, delicate) |
| cryptic(adjective, obscure, difficult, dark, strange) |
| unfathomable(adjective, hard, obscure, difficult, dark) |
| ambiguous(adjective, dark, false, uncertain, mysterious) |