| Daedalean(adjective, difficult, complex, intricate, thorny) |
| Gordian(adjective, difficult, complex, intricate, thorny) |
| abstruse(adjective, difficult, complex, intricate, thorny) |
| arduous(adjective, difficult, complex, intricate, thorny) |
| byzantine(adjective, difficult, complex, intricate, thorny) |
| can of worms(expression, adjective, idiom, difficult, complex) |
| complex(adjective, difficult, intricate, thorny) |
| complicated(adjective, difficult, complex, intricate, thorny) |
| convoluted(adjective, difficult, complex, intricate, thorny) |
| dense(adjective, difficult, complex, intricate, thorny) |
| difficult(adjective, complex, intricate, thorny) |
| elaborate(adjective, difficult, complex, intricate, thorny) |
| entangled(adjective, difficult, complex, intricate, thorny) |
| fancy(adjective, difficult, complex, intricate, thorny) |
| gasser(adjective, difficult, complex, intricate, thorny) |
| hard(adjective, difficult, complex, intricate, thorny) |
| hi-tech(adjective, difficult, complex, intricate, thorny) |
| interlaced(adjective, difficult, complex, intricate, thorny) |
| intricate(adjective, difficult, complex, thorny) |
| involved(adjective, difficult, complex, intricate, thorny) |